活性炭/LiNi0.5Mn1.5O4电容器性能及活性炭负极的劣化分析

doi:10.11944/j.issn.1000-0518.2015.11.150094

摘要/Abstract

摘要：

为提高电化学电容器的工作电压,采用电池材料LiNi_0.5Mn_1.5O₄(LNMO)为正极,活性炭为负极,组装成混合型电容器并探索了提高其性能的最佳条件。负/正极质量比增加、充放电截止电压的升高均能显著提高电容器的放电容量和能量密度,在负/正质量比为4,电压0~3 V, 电流密度1×10^-3 A/cm²的条件,700次循环后容量保持率达97.5%。运用三电极体系、电化学阻抗谱等测试手段对此负极活性炭的劣化及其对电容器性能的影响进行了深入探索。

关键词: LiNi_0.5Mn_1.5O₄, 活性炭, 电化学电容器, 劣化机制

Abstract:

In order to improve the working voltage of electrochemical capacitors, LiNi_0.5Mn_1.5O₄(LNMO) was employed as the positive electrode material and activated carbon(AC) was used as the negative electrode material for the asymmetric electrochemical capacitors and the optical conditions was explored. Enhancing the mass ratio of AC/LNMO and the voltage ranges could both increase the discharge capacity and energy density. At the AC/LNMO mass ratio of 4 and in the 0~3 V voltage range, 97.5% capacity retention was achieved after 700 cycles at current density of 1×10^-3 A/cm². Three-electrode system and electrochemical impedance spectroscopy were applied to explore the degradation of AC anode, and we also analyzed its influence in the AC/LNMO asymmetric capacitors.

Key words: LiNi_0.5Mn_1.5O₄, activated carbon, electrochemical capacitors, degradation

中图分类号:

杨柳, 齐力, 王宏宇. 活性炭/LiNi_0.5Mn_1.5O₄电容器性能及活性炭负极的劣化分析[J]. 应用化学, 2015, 32(11): 1327-1334.

YANG Liu, QI Li, WANG Hongyu. Properties of Activated Carbon/LiNi_0.5Mn_1.5O₄Capacitors and Degradation Analysis of Activated Carbon Anode[J]. Chinese Journal of Applied Chemistry, 2015, 32(11): 1327-1334.

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活性炭/LiNi_0.5Mn_1.5O₄电容器性能及活性炭负极的劣化分析

Properties of Activated Carbon/LiNi_0.5Mn_1.5O₄Capacitors and Degradation Analysis of Activated Carbon Anode

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