N/P比对锂离子混合型电容器性能的影响研究
Study on the Influence of N/P Ratio on the Performance of Li-Ion Hybrid Supercapacitor
谢胜男 1杨重阳 1张灿1
作者信息
- 1. 上海奥威科技开发有限公司,上海 201203
- 折叠
摘要
锂离子混合型电容器因兼具锂离子电池的高比能量和超级电容器的高比功率优点而被高度重视.然而,负极/正极容量比(N/P)的变化,不仅会在初始循环过程中造成容量损失消耗活性锂,而且可能导致过充电和过放电,对锂离子混合型电容器的长期循环稳定性、快充性能和安全性能的影响很大.因此,研究N/P比对于首次库伦效率(ICE)、循环性能、快充性能和安全性能具有重要意义.本文采用活性炭和电池型材料LiNi0.5Co0.2Mn0.3O2做复合正极材料(AC/NCM),硬碳(HC)做负极材料,设计并制备了不同N/P比(0.5、0.6、0.8、1.2、1.8、2.7)的软包锂离子混合型电容器,通过一系列研究表明,N/P 比远大于 1 时,对能量密度和首效的发挥不利,N/P 比小于1 时,对安全性能极为不利.
Abstract
Lithium-ion hybrid supercapacitors have attracted great attention because of their advantages of combining high specific energy of lithium-ion batteries and high specific power of supercapacitors.However,the change in the negative/positive capacity ratio(N/P)will not only cause capacity loss and consumption of active lithium during the initial cycle,but also may lead to overcharge and overdischarge.The N/P ratio has a great impact on the long-term cycle stability,fast charge performance and safety performance of lithium-ion hybrid supercapacitors.Therefore,it is important to study the influence of N/P ratio on initial Coulomb efficiency(ICE),cycle performance,fast charge performance and safety performance.In this paper,the battery-type material LiNi0.5Co0.2Mn0.3O2 and capacitor-type material activated carbon were used as the composite positive electrode material(AC/NCM),and hard carbon(HC)was used as the negative electrode material.Pouch-type lithium-ion hybrid supercapacitors with different N/P ratios(0.5,0.6,0.8,1.2,1.8,2.7)were designed and prepared.When the N/P ratio is much greater than 1,it is unfavorable to the energy density and ICE,and when the N/P ratio is less than 1,it is extremely unfavorable to the safety performance.
关键词
锂离子混合型电容器/N/P比/循环稳定性/快充性能/安全性能Key words
Li-ion hybrid supercapacitor/N/P ratio/cycle stability/fast charge performance/safety performance引用本文复制引用
出版年
2024
NETL
NSTL
万方数据