硒掺杂改性新能源汽车锂电池正极材料的结构与电化学性能

doi:10.11962/1006-4990.2019-0158

摘要/Abstract

摘要：

为了开发出具有能量密度大、循环性能优越等特性的高能量密度电池材料,研究了硒掺杂量对富锂锰基正极材料显微组织和电化学性能的影响。结果表明,硒掺杂量增加有助于减小正极材料中颗粒粒径,但是硒掺杂量过高（x=0.21）会出现严重颗粒团聚现象,锂电池正极材料中适宜的硒掺杂量为x=0.14,此时正极材料可以获得粒径细小、均匀的颗粒;x=0.14的正极材料由于具有最佳的抑制氧损失的作用而具有最高的库伦效率（77.1%）;当倍率为0.1C~10C时,正极材料的放电比容量会随着硒含量升高而先增大后减小,在x=0.14时取得最大值,即x=0.14的正极材料的倍率性能最优;x=0.14的正极材料的循环性能明显高于x=0的正极材料。

关键词: 锂电池, 硒掺杂, 电化学性能

Abstract:

In order to develop high energy density battery materials with high energy density and superior cycle performance,the effect of Se doping amount on the microstructure and electrochemical properties of lithium-rich manganese based cathode materials was studied.Results showed that the increase of Se doping amount was helpful to reduce the particle size in the positive material,but if the Se doping amount is too high（x=0.21）,there will be serious particle aggregation;the appropriate Se doping amount in the cathode material of lithium battery was x=0.14,at this time,the cathode material with fine and uni-form particles can be obtained; the positive material with x=0.14 had the highest Coulomb efficiency due to the best inhibition of oxygen loss（77.1%）;when the ratio was at 0.1C~10C,the discharge specific capacity of the positive material increased first and then decreased with the increase of Se doping amount,and the maximum value was obtained when x=0.14,it showed that ratio performance of the positive material with x=0.14 was the best;the cycle performance of the positive material with x=0.14 was significantly higher than that of the positive material with x=0.4.

Key words: lithium battery, Se doping, electrochemical performance

中图分类号:

TQ125.2

李通,史云斌,刘庆彬,何爽. 硒掺杂改性新能源汽车锂电池正极材料的结构与电化学性能[J]. 无机盐工业, 2020, 52(2): 17-22.

Li Tong,Shi Yunbin,Liu Qingbin,He Shuang. Structure and electrochemical properties of cathode materials for new energy automotive lithium batteries doped and modified by Se[J]. Inorganic Chemicals Industry, 2020, 52(2): 17-22.

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Se含量	Se	Co	Ni	Mn	Li
x=0.00	0.00	0.10	0.22	0.68	1.499
x=0.07	0.08	0.08	0.21	0.63	1.498
x=0.14	0.16	0.08	0.20	0.56	1.498
x=0.21	0.25	0.07	0.19	0.49	1.499

x（Se）	LiNiO₂			Li₂MnO₃
x（Se）	a	c	f_a/%	a	b	c	f_a/%
0.00	2.844 4	14.192 5	47.7	4.937 1	8.532 1	5.030 1	52.3
0.07	2.844 3	14.192 1	51.9	4.937 3	8.532 4	5.029 6	48.1
0.14	2.844 0	14.191 2	57.9	4.937 7	8.532 7	5.029 1	42.1
0.21	2.843 7	14.190 8	54.3	4.937 9	8.533 2	5.027 7	45.7

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