AlF3-coated LiCoO2 and Li[Ni1/3Co1/3Mn1/3]O2 blend composite cathode for lithium ion batteries
AlF3-coated LiCoO2 and Li[Ni1/3Co1/3Mn1/3]O2 blend composite cathode for lithium ion batteries
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DOI：
10.1016/j.jpowsour.2010.11.014
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发表时间：
2011-08
影响因子：
9.2
通讯作者：
Ki-Soo Lee;Seung‐Taek Myung;Dong‐Won Kim;Yang‐Kook Sun
中科院分区：
文献类型：
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作者：
Ki-Soo Lee;Seung‐Taek Myung;Dong‐Won Kim;Yang‐Kook Sun
电极材料的表面改性可以改善锂电池正极材料的电化学和热学性能。由于AlF3包覆的LiCoO2和AlF3包覆的Li[Ni1/3Co1/3Mn1/3]O2正极材料具有相同的晶体结构和相似的电化学性能，本研究采用共混法制备了两种正极材料。该复合电极在3.0V-4.5V的电压范围内具有180mAhg−1的高放电容量。50次循环后，复合电极的容量保持率大于初始容量的95%。由于AlF3包覆的Li[Ni1/3Co1/3Mn1/3]O2具有优异的热稳定性，这些复合电极的热稳定性得到了极大的提高。包覆AlF3的LiCoO2和包覆AlF3的Li[Ni1/3Co1/3Mn1/3]O2混合电极在227℃和277℃出现两个放热峰，同时放热率显著降低。
Surface modifications of electrode materials can improve the electrochemical and thermal properties of cathodes for use in lithium batteries. In this study, AlF3-coated LiCoO2and AlF3-coated Li[Ni1/3Co1/3Mn1/3]O2cathode materials are blended, as both have the same crystal structure and exhibit similar electrochemical properties. The composite electrodes exhibit high discharge capacities of 180–188mAhg−1in a voltage range of 3.0–4.5V at room temperature. The capacity retention of the composite electrode is greater than 95% of the initial capacity after 50 cycles. The thermal stability of these composite electrodes is greatly improved because of the superior thermal stability of AlF3-coated Li[Ni1/3Co1/3Mn1/3]O2. The blended AlF3-coated LiCoO2and AlF3-coated Li[Ni1/3Co1/3Mn1/3]O2electrode shows two exothermic peaks, one at 227°C from AlF3-coated LiCoO2and another at 277°C from AlF3-coated Li[Ni1/3Co1/3Mn1/3]O2, accompanied by significantly reduced exothermic heat generation.