Synthesis and Electrochemical Properties of High-Density LiNi0.8Co0.2O2 for the Lithium-Ion-Battery Cathode
Synthesis and Electrochemical Properties of High-Density LiNi0.8Co0.2O2 for the Lithium-Ion-Battery Cathode
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锂离子电池正极用高密度LiNi0.8Co0.2O2的合成及电化学性能
DOI：
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发表时间：
2008
期刊：
影响因子：
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通讯作者：
Haijiang Wang
中科院分区：
文献类型：
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作者：
Hongwei Tang;Zhihong Zhu;Zhaorong Chang;Zhongjun Chen;Xiao‐Zi Yuan;Haijiang Wang
采用熔点为175.7℃的0.62LiNO 3 -0.38LiOH和Ni 0.8 Co 0.2 (OH) 2 共晶熔盐合成法，控制Li/(Ni+Co)比为1.1:1。 X射线衍射分析表明该材料具有发达的层状结构。充放电测试表明，在800℃制备的LiNi 0.8 Co 0.2 O 2 正极在0.2 mA cm -2 的电流密度下，首次放电容量高达163 mAh g -1 ，并且在3.0-4.3 V范围内具有优异的容量保持率。
LiNi 0.8 Co 0.2 O 2 powder with a tap density of 3.23 g cm -3 has been successfully prepared by a molten-salt synthesis method using a eutectic molten salt of 0.62LiNO 3 -0.38LiOH with a melting point of 175.7°C and Ni 0.8 Co 0.2 (OH) 2 , where the ratio of Li/(Ni + Co) is controlled at 1.1:1. X-ray diffraction analysis has shown that this material has a well-developed layered structure. Charge-discharge tests have shown that an LiNi 0.8 Co 0.2 O 2 cathode prepared at 800°C has an initial discharge capacity as high as 163 mAh g -1 and excellent capacity retention in the range of 3.0-4.3 V at a current density of 0.2 mA cm -2 .