锂离子电池正极材料球形LiNi 0.7 Co 0.15Mn 0.15O2的制备和性能

材料研究学报

2010, Vol. 24

Issue (2): 159-164

研究论文

本期目录 | 过刊浏览

锂离子电池正极材料球形LiNi _0.7 Co _0.15Mn _0.15O₂的制备和性能

谭欣欣^1;2; 唐有根¹; 王伟东²; 王海涛²; 丁倩倩²

1.中南大学~化学化工学院长沙 410083
2.深圳市天骄科技开发有限公司深圳 518119

Synthesis and Electrochemical Characteristics of Layered LiNi0.7Co0.15Mn0.15O2 Cathode Materials for Li-ion Batteries

TAN Xinxin ^1;2; TANG Yougen¹; WANG Weidong²; WANG Haitao ²; DING Qianqian²

1.College of Chemical & Chemical Engineering; Central South University; Changsha 410083
2.Shenzhen Tianjiao Technology Co.; Ltd. Shenzhen 518119

引用本文:

谭欣欣唐有根王伟东王海涛丁倩倩. 锂离子电池正极材料球形LiNi _0.7 Co _0.15Mn _0.15O₂的制备和性能[J]. 材料研究学报, 2010, 24(2): 159-164.
. Synthesis and Electrochemical Characteristics of Layered LiNi0.7Co0.15Mn0.15O2 Cathode Materials for Li-ion Batteries[J]. Chin J Mater Res, 2010, 24(2): 159-164.

全文: PDF(930 KB)

摘要:

采用化学共沉淀法制备球形前驱体Ni _0.7 Co _0.15 Mn _0.15 (OH) ₂, 将其与LiOH ? H₂O充分混合后高温烧结制备出锂离子电池正极材料球形LiNi _0.7 Co _0.15 Mn _0.15 O ₂, 用X射线衍射(XRD)、扫描电镜(SEM)、热重--差热分析(TG/DSC)以及恒电流充放电测试对样品进行表征, 研究了烧结温度对产物的形貌和电化学性能的影响。结果表明, 在750℃合成的LiNi _0.7 Co _0.15 Mn _0.15 O ₂物相单一无杂相, 具有标准的α--NaFeO₂晶型, 为层状嵌锂复合氧化物。SEM测试显示, 产物为球形且球形度较好, 颗粒粒度均一, 分布较窄, 平均粒径在10 μm左右。在3.0--4.3 V、0.2C充放电条件下, 25℃其初始放电容量高达185.2 mA ? h/g, 30轮循环后容量保持率达到98.32%。可见球形LiNi _0.7 Co _0.15 Mn _0.15 O ₂显示了较高的首轮放电容量以及良好的循环性能, 表现出较好的电化学性能。

关键词 ：无机非金属材料 , 锂离子电池 , LiNi _0.7 Co _0.15 Mn _0.15 O ₂, 共沉淀法 , , 正极材料

Abstract：

Spherical LiNi _0.7 Co _0.15 Mn _0.15 O₂ powder was synthesized by firing LiOH·H₂O and the spherical Ni _0.7 Co _0.15 Mn _0.15 (OH)₂ prepared by co-precipitation method. The obtained powder was characterized by X-ray diffraction (XRD), Scanning electronic microscope (SEM), Thermogravimetric/Differential scanning calorimeter (TG/DSC) and constant current charge-discharge cycling. The results show that the optimal preparation condition of the layered LiNi_0.7 Co_0.15 Mn _0.15 O₂ was 750 under oxygen flowing. The XRD pattern of the sample prepared under the above condition can be identified by a typical structure of hexagonal α-NaFeO₂ type. The SEM micrograph of LiNi _0.7 Co _0.15 Mn _0.15 O₂shows that the particle size is about 10 μm with narrow grain size. Electrochemical measurements show that it delivered an initial discharge capacity of 185.2 mA·h/g with the voltage range 3–4.3V at the 0.2C rate and initial capacity retention of 98.32% after 30 cycles.

Key words： inorganic non-metallic materials lithium secondary battery LiNi _0.7 Co _0.15 Mn _0.15 O ₂ co-precipitation method cathode material

收稿日期: 2009-12-22

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