Synthesis of High Tap-Density Layered LiMn0.4Ni0.4Co0.2O2 Cathode Material

Acta Scientiarum Naturalium Universitatis Pekinensis

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

Received:2006-09-18 Online:2006-12-30 Published:2006-12-30

高密度LiMn_0.4Ni_0.4Co_0.2O₂正极材料的合成与研究

代克化¹⁾, 王银杰²⁾, 何平¹⁾, 谢燕婷¹⁾, 其鲁^{1, 3)}
(¹⁾北京大学化学与分子工程学院, 应用化学系, 新能源材料与技术实验室, 北京, 100871; ²⁾北京理工大学材料科学与工程学院, 北京, 100081; ³⁾通讯作者, E-mail: qilu@pku.edu.cn)

Abstract

Abstract: 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.

Key words: Li-ion battery, cathode material, co-precipitation

摘要： 用一种改进的氢氧化物共沉淀法制备了粒径均一、近球形的Mn_0.4Ni_0.4Co_0.2(OH)₂, 再通过高温固相合成法制备了高密度的LiMn_0.4Ni_0.4Co_0.2O₂正极材料。结果表明，在沉淀体系中加入F^-，可以在较为宽松的条件下制备出振实密度为2.3g·cm^-3的LiMn_0.4Ni_0.4Co_0.2O₂正极材料。对产物进行了XRD、SEM和充放电测试。SEM测试结果表明，产物具有良好的形貌; XRD测试表明，产物具有良好的层状结构，无杂质相存在。在充放电电压区间为3.0~4.4V,电流密度为30mA·g^-1时，首次充电和放电容量分别为185和164mAh·g^-1，经过50次循环，放电容量仍能保持90%。

关键词: 锂离子电池, 正极材料, 共沉淀

CLC Number:

O614
O646

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. Synthesis of High Tap-Density Layered LiMn_0.4Ni_0.4Co_0.2O₂ Cathode Material[J]. Acta Scientiarum Naturalium Universitatis Pekinensis.

代克化¹⁾, 王银杰²⁾, 何平¹⁾, 谢燕婷¹⁾, 其鲁^{1, 3)}
(¹⁾北京大学化学与分子工程学院, 应用化学系, 新能源材料与技术实验室, 北京, 100871; ²⁾北京理工大学材料科学与工程学院, 北京, 100081; ³⁾通讯作者, E-mail: qilu@pku.edu.cn). 高密度LiMn_0.4Ni_0.4Co_0.2O₂正极材料的合成与研究[J]. 北京大学学报（自然科学版）.

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

高密度LiMn_0.4Ni_0.4Co_0.2O₂正极材料的合成与研究

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