储能科学与技术2024，Vol.13Issue(7)：2141-2150,10.DOI:10.19799/j.cnki.2095-4239.2024.0375
硬碳动力学特性对钠离子电池低温性能的影响及机制
Effect of hard carbon kinetic properties on low-temperature performance of Na-ion batteries
摘要
Abstract
Pouch-type Na-ion batteries were fabricated using a Na4Fe3(PO4)2P2O7 cathode and hard carbon(HC)anodes obtained from different sources:biomass-derived(HC-A),resin-derived(HC-B),and biomass-derived(HC-C).The effect of the HC anode on the cycling durability and low-temperature performance was investigated.The charge transfer impedance,solid electrolyte interphase impedance,and diffusion coefficient values were determined for the three HC anodes by electrochemical impedance spectroscopy,distribution of relaxation times,and galvanostatic intermittent titration technique.The kinetic properties,which directly affect the battery performance,showed the following trend:HC-A>HC-C>HC-B.The best cycling durability was obtained with HC-A,which was stable at room temperature with 5C fast charging and-10℃ with 0.2C charging.In addition,a capacity ratio of 87.5％was achieved with a 0.5C discharge at-30℃.The HC-B anode led to the lowest kinetic performance;it failed when cycling at 15℃ with 0.5C charging,and the capacity ratio was only 83.7％with a 0.5C discharge at-30℃.The low-temperature performance of the battery using HC-B was significantly improved by increasing the N/P ratio of the battery.After 100 cycles at-10℃ with 0.1C charging,the capacity retention remained stable at about 104％.This work represents an important foundation to improve the design of Na-ion batteries.关键词
钠离子电池/硬碳/低温性能/动力学/N/P比Key words
Na-ion battery/hard carbon/low temperature performance/kinetic property/N/P ratio分类
信息技术与安全科学引用本文复制引用
徐雄文,莫英,周望,姚环东,洪娟,雷化,涂健,刘继磊..硬碳动力学特性对钠离子电池低温性能的影响及机制[J].储能科学与技术,2024,13(7):2141-2150,10.基金项目
岳麓山工业创新中心重点项目(2023YCII0119). （2023YCII0119）
