Table of Content

30 December 2006, Volume 42 Issue 7

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Study on the Electrochemical Performance of Improvement 2,5-Dimercapto-1,3,4-Thiadiazole (DMcT) by Poly(3-Methoxythiophene)(PMOT)

ZHANG Jinghua¹⁾, Qilu^{2, 4)}, SHU Dong³⁾, YANG Lihong²⁾, ZHANG Xiaoyu²⁾
(¹⁾ CITIC Guoan Mengguli New Energy Technology Co., Ltd, Beijing, 102200; ²⁾New Energy Materials and Te

2006, 42(7):  18-21. 

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Electrochemical polymerized Poly(3-Methoxythiophene)(PMOT) film electrode was used to investigate the electro-catalytic effect of PMOT on the electrochemical redox reaction of 2,5-dimercapto-1,3,4-thiadiazole(DMcT). PMOT film electrode was electrochemically treated before it was scanned in 0.5mol/L DMcT 0.1mol LiClO₄/1L AN electrolyte. The cyclic voltammograms of PMOT film electrode in 0.5mol/L DMcT 0.1mol LiClO₄/1L AN solution changed with the above treatment, implying the electrocatalytic effect of PMOT on the redox reaction of DMcT. The formation of electron-donor-accept or adducts through the interaction between thiolordisulfide groups of DMcT and MOT groups of PMOT during the treatment was probably the reason of the catalysis. The electrochemical properties of the adduct were different from those of DMcT. The adduct possessed a higher discharge capacity and a better electrochemical reversibility than the case DMcT used alone.

Preparation and Electrochemical Properties of Li_1+xCo_0.2Ni_0.8O₂

JIANG Weijun^1),2),4), CHEN Yongchong^3),2), GUO Yingjun¹⁾, Alamusi¹⁾
(¹⁾CITIC Guoan Mengguli New Energy Technology Co., Ltd, Beijing, 102200; ²⁾New Energy Materials and Technology Labo

2006, 42(7):  22-27. 

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Li_1+xCo_0.2Ni_0.8O₂ samples were synthesized by simultaneous precipitation and solution impregnation methods, characterized by X-ray Diffraction (XRD), Scanning Electronic Microscope (SEM), Inductively Coupled Plasma-Atomic Emission Spectrometry (ICP-AES) and galvanostatic cycling. The results show that the spherical product, without impurities, has a typical α-NaFeO₂ layered structure and moderate particle size. It is also shown that the product with x=0.08 boasts high efficiency, high specific capacity and good cycling performance with the initial capacity of 183mAh/g and the capacity retention of 93.4% after 50 cycles (2.00mA/cm²).

Applications and Development of Li-ion Secondary Batteries

AN Ping^{1, 3)}, Qilu²⁾
(¹⁾CITIC Guoan Mengguli New Energy Technology Co., Ltd., Beijing,102200; ²⁾ New Energy Materials and Technology Laboratory, Department of Applied Chemistry,College of Chemistry and Mole

2006, 42(7):  1-7. 

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Lithium-ion secondary batteries, boasting such merits as high capacity, long cycle life, environmental-friendliness and high safety, have been widely applied to such portable electronic devices as mobile phones and notebook computers. Along with the technological development, lithium-ion secondary batteries are also seeing great application prospect with electric vehicles (EV) and energy storage, which is to exert a profound influence on people's life in the future. The recent years have witnessed continuous improvement on the capacity and cycling performance of lithium-ion batteries, and the market is to see the launching of lighter, thinner and smaller lithium-ion batteries with higher capacity and lower cost. The authors deal with the historical and latest development of lithium-ion battery as well as the current applications.

Research on LiMn₂O₄-Based Power Battery System

WU Ningning¹⁾, LEI Xiangli, XU Hua, XU Jinlong, YANG Yongwei
(CITIC Guoan Mengguli New Energy Technology Co. Ltd, Beijing,102200; ¹⁾Corresponding Author,E-mail: wuningning@gmail.com)

2006, 42(7):  67-71. 

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Anode materials, electrolyte and voltage are studied to define the ideal system for LiMn₂O₄-based lithium-ion power battery. It is concluded that low cost natural graphite presents as an ideal anode material for LiMn₂O₄-based lithium-ion power battery; the improved electrolyte prolongs the cycle life for 200 cycles; and LiMn₂O₄-based lithium-ion power battery presents the best stability and the longest cycle life under the voltage range between 3.0V and 4.2V LiMn₂O₄-based lithium-ion power battery based on the above system presents excellent performance such as high safety, long cycle life, high performance under high and low temperatures as well as superior storage performance.

Development of Pure EV Powered by LiMn₂O₄-Based Li-ion Battery

MAO Yongzhi, Qilu¹⁾, WU Ming, JIAN Gang, AN Ping, LOU Shude
(CITIC Guoan Mengguli New Energy Technology Co., Ltd, Beijing, 102200; ¹⁾Corresponding Author,E mail:qilu@pku.edu.cn)

2006, 42(7):  77-82. 

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Powered by spinel LiMn₂O₄-based 100Ah Li-ion secondary battery, an electric vehicle (EV) named MGL6486EV was developed with a 30kW AC motor. The total voltage of the battery system is 296V, and the total energy is 37 kWh. Intelligent battery management system (BMS) and the balancing system were adopted. Digital control has been applied to the motor, which serves such functions of braking energy regeneration and sliding prevention. The intelligent charging machine keeps all-time communication with the BMS during the charging process, to guarantee the safe and fast charging. Major parameters of the EV are: maximum speed: 117km/h, acceleration: 6.80s (0-50km/h), 7.34s (50-80km/h), climbing ability: >20%, driving range per charge: 204 km, and energy consumption per 100km: 19kWh. Up to now, MGL6486EV has covered over 50 thousand km, and the test is still going on.

Influence of Characteristics of Li-Mn-O Spinel Oxide Grain on Its Electrochemical Performance

LI Wei^{1, 3)}, Tonggelage¹⁾, MU Qiyong¹⁾, XIE Yanting²⁾
(¹⁾CITIC Guoan Mengguli New Energy Technology Co., Ltd, Beijing 102200; ²⁾New Energy Materials and Technology Laboratory, Departme

2006, 42(7):  8-11. 

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Spherical MnO₂ and irregular shape MnO₂ were synthesized by liquid redox method. Then, spherical Li-Mn-O spinel oxide was synthesized by high temperature reaction of MnO₂ and LiOH. The difference of the two materials on physical chemistry characteristic and electrochemical performance were studied. The results show that the range of spherical Li-Mn-O spinel oxide granularity distribution is narrow and the specific surface area is small. The cycling performance of spherical Li-Mn-O spinel oxide is stable during the process of charge and discharge at normal temperature and significantly improved at high temperature.

Synthesis and Electrochemical Properties of Layered LiNi_1/3Mn_1/3Co_1/3O₂ Cathode Material

WEN Lei, Qilu¹⁾, XU Guoxiang
(New Energy Materials and Technology Laboratory, Department of Applied Chemistry, College of Chemistry and Molecular Engineering,Peking University, Beijing, 100871; ¹⁾Corresponding Author, E-mail: qi

2006, 42(7):  12-17. 

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LiNi_1/3Mn_1/3Co_1/3O₂ cathode material was synthesized by carbonate simultaneous precipitation method. The material was characterized by XRD (X-Ray Diffraction), SEM (Scanning Electron Microscope), differential chronopotentiometry and galvanostatic cycling. XRD results show that all the products synthesized above 800℃ have typical α-NaFeO₂ layered structure. SEM results show that the powders synthesized at 800℃ have a spherical structure composed of small aggregates, whereas the products synthesized above 900℃ have an irregular structure and are fractured. In the voltage range of 2.5~4.4V, the LiNi_1/3Mn_1/3Co_1/3O₂ cathode material synthesized at 950℃ has an initial specific discharge capacity of 162mAh·g^-1 with effective cycling performance. With the increase of the charge-discharge voltage, electrochemical stability was reduced and irreversible capacity loss occurred during the first cycle. The samples synthesized at lower temperatures (800, 850℃) exhibited higher specific capacities and slower capacity fading upon cycling than the samples synthesized at higher temperatures (900, 950℃), which was due to the structural difference.

Study on Synthesis and Electrochemical Performance of LiNi_xMn_1-xO₂(0x<1) Cathode Material for Lithium-Ion Cell

HE Ping, YANG Lihong, XIE Yanting, FENG Huajun, DAI Kehua, Qilu¹⁾
(New Energy Materials and Technology Laboratory, Department of Applied Chemistry, College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871; ¹⁾

2006, 42(7):  28-33. 

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Spherical LiNi_xMn_1-xO₂(0x<1) with high tap-density was synthesized from spherical composite carbonate via a simple uniform-phase precipitation method. The effects of different contents of nickel and manganese in samples on morphology, structure and electrochemical performance were discussed. The samples were composed by primary particles and featured comparatively large specific surface area. As confirmed by X-ray diffraction, the samples had well-ordered layer-structure with sharp peak on 006-012 and 008-110. Experimental results demonstrate that the specific capacity of LiNi_xMn_1-xO₂ (x=0.5) is 153mAh/g with good cycling performance.

Synthesis of High Tap-Density Layered LiMn_0.4Ni_0.4Co_0.2O₂ Cathode Material

DAI Kehua¹⁾, WANG Yinjie²⁾, HE Ping¹⁾, XIE Yanting¹⁾, Qilu^{1, 3)}
(¹⁾New Energy Material and Technology Laboratory, Department of Applied Chemistry, College of Chemistry and Molecular Engi

2006, 42(7):  34-38. 

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Uniform spherical metal hydroxide Mn_0.4Ni_0.4Co_0.2(OH)₂ was prepared via improved hydroxide precipitation, and then LiMn_0.4Ni_0.4Co_0.2O₂ was prepared by mixing this metal hydroxide with 5% excess LiOH by heat-treatment. It is shown that the product with the high tap-density of 2.3g·cm^-3 can be prepared under relatively extensive condition via the addition of F^- in system. The product was characterized using X-ray diffraction(XRD), scanning electron microscope (SEM) and charge-discharge tests. The SEM results show that the product has a good morphology, and the XRD studies demonstrate that the material has a well-ordered layered structure without impurity phase. The initial charge and discharge capacities are 185 and 164mAh·g^-1 at a voltage range from 3.0 to 4.0V and a current density of 30mA·g^-1, and 90% of the discharge capacity is retained after 50 charge-discharge cycles.

A Novel Silicon/Carbon Composite Film as Anode Material for Lithium-Ion Secondary Battery

ZHAO Zhongqin^{1, 3)}, WU Zhongyou¹⁾, YANG Wubao²⁾, LIU Xin¹⁾, JIANG Weijun¹⁾
(¹⁾CITIC Guoan Mengguli New Energy Technology Co., Ltd., Beijing, 102200; ²⁾Faculty of Mechanical

2006, 42(7):  39-43. 

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Silicon-carbon composite film was prepared with vapor deposition technology. The measurements of XRD and Raman spectroscopy indicate that the Si_xC_y/C composite film has nano-microcrystalline structure. The results of electrochemical test indicate that the Si_xC_y/C composite film deposited on Cu foil has low plateau during charge and discharge (below 0.5V vs. Li⁺/Li), the corresponding discharge capacity reaches 1200mAh/g, and the capacity retention is 85% after 200 cycles. The improvement of the electrochemical performance of the Si_xC_y/C composite film contributes to the buffer framework and doping C element, which improves the conductivity of the composite and effectively buffer the volume change induced by Li insertion/extraction.

Preparation of Polymer Electrolyte Membranes Supported by Non-Woven Fabrics for Lithium-Ion Polymer Batteries

SONG Zhaoshuang, QIU Jingyi, MA Jianwei, Qilu¹⁾
(New Energy Materials and Technology Laboratory,Department of Applied Chemistry, College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871; ¹⁾Corresponding

2006, 42(7):  44-47. 

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Non-woven fabrics were modified via radiation-induced grafting of styrene (St ) and then immersed in the mixed solution of butanone / PVDF-HFP / butanol to prepare porous composite polymer electrolyte membranes. The obtained composite membranes supported by non-woven fabrics have appropriate thickness and good mechanical strength. Radiation grafting enhances the interaction between non-woven fabrics and PVdF-HFP-based polymer mixtures. Finally, the lithium-ion battery assembled with the obtained membrane was tested, which exhibits higher capability and better cycling performance.

Preparation and Performance Study of a Novel Polymer Lithium-Ion Battery

TANG Dingguo^{1, 4)}, CI Yunxiang²⁾, LIU Lihui³⁾, FENG Huajun^2),3), MA Jianwei^{2, 3)}
(¹⁾ College of Chemistry and Materials Science, South-Central University for Nationalities, Wuhan 43007

2006, 42(7):  48-51. 

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Microporous polymer films were formed on the surfaces of anode electrodes by using a spray gun. A novel polymer lithium-ion battery was assembled with the treated anode electrodes. The performance of the polymer lithium-ion battery was proven to be very good, which suggested that the new preparation method was feasible.

Preparation and Application of Power Li-ion Secondary Battery with Spinel LiMn₂O₄ Cathode Material

XU Hua¹⁾, WU Ningning, CHEN Hui, LEI Xiangli
(CITIC Guoan Mengguli New Energy Technology Co., Ltd, Beijing, 102200; ¹⁾Corresponding Author, E-mail: xuhua1999@vip.sina.com )

2006, 42(7):  52-57. 

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100?Ah lithium-ion power batteries were prepared by using spinel LiMn₂O₄ cathode material. The result shows that such battery boast superior charge-discharge performance and good safety performance. The 400Ah battery pack, assembled with four such batteries, was installed in buses for long-term trials in Beijing. Tests indicate that both the batteries and the vehicles run well and spinel LiMn₂O₄-based Li-ion secondary batteries can fully meet the requirements of electric vehicles (EVs).

High Power Li-ion Secondary Batteries Based on New Cathode Materials

WANG Jian¹⁾, LI Linxiang¹⁾, Qilu^{2, 3)}, AN Ping¹⁾
(¹⁾CITIC Guoan Mengguli New Energy Technology Co., Ltd., Beijing,102200; ²⁾ New Energy Materials and Technology Laboratory, Department

2006, 42(7):  58-61. 

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The 18650 lithium-ion secondary battery is prepared with spinel LiMn₂O₄ cathode material, and major factors affecting lithium-ion secondary battery's discharge performance under big currents are analyzed, including tab, electrode and electrolyte. Another 18650 high power lithium-ion secondary battery is prepared with innovative cathode material LiMn_xNi_yCo_zO₂, which presents superior performance. The battery endures continuous discharge under 10C and quick charge under 8C and presents excellent cycling and storage performance. The development of 18650 high power lithium-ion secondary battery provides the experimental references for high power lithium-ion secondary battery for hybrid electric vehicle (HEV).

Investigation of Al-Plastic Film Lithium-Ion Secondary Battery for E-Bike

HAO Deli¹⁾,Qilu^{2, 3)},WANG Yinping¹⁾,AN Ping¹⁾
(¹⁾CITIC Guoan Mengguli New Energy Technology Co., Ltd., Beijing,102200; ²⁾New Energy Materials and Technology Laboratory, Department of A

2006, 42(7):  62-66. 

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5.5Ah cylindrical Al-plastic film LiMn₂O₄-based lithium ion battery for E-bike was developed. These batteries exhibit good performance in rate discharge, cycle life and at high and low temperatures. The cells pass the safety test of GB/T 18287-2000 without any fire or explosion. The cells were stored for 3 months after discharging to 3.0V, and bulge appeared on the cell surface. With several cycles, the bulge disappeared without significant performance decay. The 10.8V/5Ah battery pack (3 cells in series) retain 82% of the initial capacity after 500 cycles at 1C, 100% DOD.

Research on Li-ion Battery Management System

LIU Zhengyao¹⁾, Qilu^{2, 3)}, DAI Jiakun¹⁾, LI Yang¹⁾
(¹⁾CITIC Guoan Mengguli New Energy Technology Co., Ltd, Beijing, 102200; ²⁾New Energy Materials and Technology Laboratory, Department

2006, 42(7):  72-76. 

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Li-ion battery management system was designed to guarantee the safe operation of the battery system during the charging and discharging process. Battery voltage, temperature and current could be detected precisely with special hardware. Raw data and results of electric motor were discussed and analyzed. The system was endured for 5thousandkm in real usage.

Recycling of Major Elements in LiMn₂O₄-Based Lithium-Ion Power Battery

AN Hongli¹⁾, WU Ningning, FAN Maosong, LI Qiqige
(CITIC Guoan Mengguli New Energy Technology Co. Ltd, Beijing, 102200; ¹⁾Corresponding Author, E-mail: anhongli@sohu.com)

2006, 42(7):  83-86. 

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A process aimed to treat and recycle the major elements in LiMn₂O₄-based lithium-ion battery is introduced. The results show that LiMn₂O₄ can be dissolved efficiently by 2mol·L^-1 HNO₃ + 1mol·L^-1 H₂O₂ solution, especially after the LiMn₂O₄ is treated under 600℃, and the best ratio of solid/liquid is 65g·L^-1. With this technology, the recycling rate of Mn can reach 98% and the purity of Li₂CO₃ can be more than 97%.

Synthesis and CO₂-Absorption Properties of Lithium Zirconate

WANG Yinjie^{1, 3)}, DAI Kehua²⁾, FENG Huajun²⁾, ZHU Yongshuang¹⁾, Qilu²⁾
(¹⁾ School of Materials Science and Engineering, Beijing Institute of Technology, Beijing, 100081; ²⁾

2006, 42(7):  87-90. 

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With nanometer-sized tetragonal ZrO₂ and lithium carbonate as starting materials, Li₂ZrO₃ absorbents were prepared by high-temperature solid-state reaction. The crystal structure of the Li₂ZrO₃ absorbents was studied by comparison of their X-ray diffraction (XRD) patterns. The microscopic morphologies of absorbents were viewed by a scanning electron microscopy(SEM). Their CO₂-absorption abilities were measured with a thermogravimetric analyzer (TG). The experimental results show that absorbed temperature influences CO₂-absorption properties of Li₂ZrO₃, which exhibits very good ability to absorb CO₂ at 500℃. The CO₂ flux, Li₂ZrO₃ sample weight and calefactive rate also have an influence on the CO₂ absorption ability of Li₂ZrO₃.

Research on the Anti-Diffusion Behavior of ZnO/Polyurethane Coatings

YANG Lihong^{1, 4)}, LIU Fuchun²⁾, ZHANG Zhiqiang³⁾, HE Ping¹⁾, HAN Enhou²⁾, Qilu¹⁾
(¹⁾ New Energy Materials and Technology,Department of Applied Chemistry, College of Chemistr

2006, 42(7):  91-96. 

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The anti-diffusion of ZnO/polyurethane coatings were studied by using the impedance spectroscopy technique. Results indicate that the coating with P/B=1 has the best anti-diffusion and salt spray performance, the breakpoint frequency of the coating with P/B=1 is lower than others, which indicates the smaller defect area.