摘要
分别以气相生长碳纤维(VGCF)、多壁碳纳米管(MWCNT)和活性炭(AC)作为单质硫载体,通过高温热处理制备锂硫电池用S/C正极材料。采用SEM、XRD、热重分析(TG)、循环伏安、电化学阻抗谱(EIS)和恒流充放电等方法,分析复合材料的结构及电化学性能。碳材料形态对锂硫电池的放电比容量和循环性能有重要影响,S/VGCF复合材料的电化学性能较好。以0.1 C的电流在1.5-3.0 V充放电,首次和第100次循环的放电比容量分别为1 204.87 m Ah/g、547.62 m Ah/g。
Sulfur( S) / carbon( C) cathode materials for lithium( Li) / S battery were prepared by high temperature heat treatment with vapor-grown carbon fiber( VGCF),multi-wall carbon nanotube( MWCNT) and activated carbon( AC) used as supporter of elemental sulfur. SEM,XRD,thermal gravimetric( TG),cyclic voltammetry,electrochemical impedance spectroscopy( EIS) and galvanostatic charge-discharge tests were used to analyse the structure and electrochemical performance of the composites. The type of carbon materials had great influence on specific discharge capacity and cycle performance of the Li / S battery,the S / VGCF composite had better electrochemical performance. When charged-discharged with the current of 0. 1 C in 1. 5 - 3. 0 V,its specific discharge capacity at initial and the 100 th cycle was 1 204. 87 m Ah / g,547. 62 m Ah / g,respectively.
出处
《电池》
CAS
CSCD
北大核心
2016年第3期133-136,共4页
Battery Bimonthly
基金
国家863计划(14zg1102)
关键词
锂硫电池
硫/碳复合材料
气相生长碳纤维(VGCF)
电化学性能
lithium(Li) / sulfur(S) battery
S / carbon(C) composite
vapor-grown carbon fiber(VGCF)
electrochemical performance