锂离子电池正极材料LiNi_0.45Co_0.10Mn_0.45O₂的合成及电化学性能

来源期刊：中南大学学报(自然科学版)2008年第1期

论文作者：张宝 张明 李新海 王志兴 郭华军 彭文杰

文章页码：75 - 75

关键词：锂离子电池；正极材料；LiNi_0.45Co_0.10Mn_0.45O₂

Key words：lithium-ion batteries; cathode material; LiNi_0.45Co_0.10Mn_0.45O₂

摘    要：以Li₂CO₃和Ni-Co-Mn三元系氧化物为原料，在空气中通过固相反应制备LiNi_0.45Co_0.10Mn_0.45O₂。研究反应条件对产物结构的影响，采用扫描电镜(SEM)表征样品的形貌，用粒度分析、振实密度和比表面测定等手段比较不同合成条件对产物性能的影响。研究结果表明：当n(Li)/n(M)不同时合成的产物性能差别很大，较适宜的n(Li)/n(M)为1.4/1；球磨可以提高产物的振实密度和比表面，并且对改善材料电化学性能有显著影响，在2.75~4.25 V电压范围内LiNi_0.45Co_0.10Mn_0.45O₂首次放电比容量达到125.9 mA·h/g，50次循环后放电比容量为128.7 mA·h/g。

Abstract: LiNi_0.45Co_0.10Mn_0.45O₂ was prepared by solid-state reaction method in air using Li₂CO₃ and Ni-Co-Mn as starting materials. The effect of reaction conditions on the structure of the product was studied. The morphology of LiNi0.45Co0.10Mn0.45O2 was characterized by scanning electron microscopy. The effect of preparation conditions on the performance of the product was characterized by particle analyzer, tap-density and specific surface area. The results show that the mole ratio of Li to M has a critical role in the performance of the product and the suitable mole ratio of Li to M is about 1.4/1. Ball-milling is a useful method to improve the performances such as tap-density, specific surface area and has significant effects on the electrochemical performance. In the voltage ranges of 2.75-4.25 V, the initial discharge capacity of LiNi_0.45Co_0.10Mn_0.45O₂ is 125.9 mA·h/g, and the discharge capacity is 128.7 mA·h/g after 50 cycles.

基金信息：国家自然科学基金资助项目