丙烯酸锂包覆天然石墨对其电化学性能的影响

doi:10.19799/j.cnki.2095-4239.2021.0556

摘要/Abstract

摘要：

本工作利用含有碳碳双键的有机小分子盐丙烯酸锂，通过自聚合在石墨表面形成具有弹性的的SEI层，系统地研究了丙烯酸锂含量对天然石墨电化学性能的影响。结果表明，丙烯酸锂含量为5%时，锂离子电池整体电化学性能包括首次库仑效率、倍率性能、大电流长循环性能都得到了显著的提高，有效地抑制了发生在石墨表面的副反应，抑制了电化学循环过程中电极阻抗的上升。

关键词: 锂离子电池, 天然石墨, 丙烯酸锂, SEI层, 自聚合

Abstract:

The effect of lithium acrylate content on the electrochemical performance of natural graphite was systematically analyzed using lithium acrylic, an organic small molecule salt containing carbon-carbon double bonds, to form an elastic solid electrolyte interphase (SEI) layer on the graphite surface through self-polymerization. The results reveal that at 5% lithium acrylic content, the overall electrochemical performance of lithium-ion batteries, including the first Coulomb efficiency, multiplicity performance, and high current long cycle performance, is significantly improved, thereby effectively suppressing side reactions on the graphite surface and inhibiting the rise of electrode impedance during the electrochemical cycle.

Key words: lithium-ion battery, natural graphite, lithium acrylic, SEI layer, self-polymerization

中图分类号:

TK 02

王灿, 马盼, 祝国梁, 魏水淼, 杨植禄, 张志宇. 丙烯酸锂包覆天然石墨对其电化学性能的影响[J]. 储能科学与技术, 2022, 11(6): 1706-1714.

WANG Can, MA Pan, ZHU Guoliang, WEI Shuimiao, YANG Zhilu, ZHANG Zhiyu. Effect of lithium acrylic-coated nature graphite on its electrochemical properties[J]. Energy Storage Science and Technology, 2022, 11(6): 1706-1714.

图/表 12

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参考文献 22

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Sample	C1s/%	O1s/%	Li1s/%	O1s/C1s
NG	97.26	2.74	0	0.02817
NG@LP3%	93.92	4.51	1.57	0.04802
NG@LP5%	92.38	5.32	2.3	0.05788
NG@LP10%	85.29	9.76	4.96	0.11443
NG@LP15%	85.01	10.08	4.91	0.11857

材料	充电比容量 /(mAh/g)	放电比容量 /(mAh/g)	首次库仑效率
NG	414.8	341.0	82.2
NG@LP3%	394.4	333.1	84.5
NG@LP5%	395.3	343.6	86.9
NG@LP10%	354.7	306.0	86.3
NG@LP15%	336.2	293.8	87.4

Sample	Cycle number	R_e/Ω	R_SEI/Ω	R_ct/Ω
NG	Before cycling	3.144	—	90.78
NG	500th cycle	5.601	24.68	63.89
NG@LP3%	Before cycling	2.388	—	135
NG@LP3%	500th cycle	9.119	2.012	31.75
NG@LP5%	Before cycling	2.183	—	169.6
NG@LP5%	500th cycle	5.312	2.76	11.1
NG@LP10%	Before cycling	2.321	—	180.3
NG@LP10%	500th cycle	4.395	8.491	99.67
NG@LP15%	Before cycling	2.707	—	171.6
NG@LP15%	500th cycle	3.63	7.745	94.48

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