One of the most important factors that limits the use of LiFePO 4 as cathode material for lithium ion batteries is its low electronic conductivity.In order to solve this problem,LiFePO 4 in situ vapor-grown carbon fib...One of the most important factors that limits the use of LiFePO 4 as cathode material for lithium ion batteries is its low electronic conductivity.In order to solve this problem,LiFePO 4 in situ vapor-grown carbon fiber (VGCF) composite cathode material has been prepared in a single step through microwave pyrolysis chemical vapor deposition.The phase,microstructure,and electrochemical performance of the composites were investigated.Compared with the cathodes without in situ VGCF,the initial discharge capacity of the composite electrode increases from 109 to 144 mA h g-1 at a 0.5-C rate,and the total electric resistance decreases from 538 to 66.The possible reasons for these effects are proposed.展开更多
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...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。展开更多
基金supported by the National Natural Science Foundation of China (50672059)
文摘One of the most important factors that limits the use of LiFePO 4 as cathode material for lithium ion batteries is its low electronic conductivity.In order to solve this problem,LiFePO 4 in situ vapor-grown carbon fiber (VGCF) composite cathode material has been prepared in a single step through microwave pyrolysis chemical vapor deposition.The phase,microstructure,and electrochemical performance of the composites were investigated.Compared with the cathodes without in situ VGCF,the initial discharge capacity of the composite electrode increases from 109 to 144 mA h g-1 at a 0.5-C rate,and the total electric resistance decreases from 538 to 66.The possible reasons for these effects are proposed.
文摘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。
基金Program for New Century Excellent Talents in University(NCET-12-0047)National Basic Research Program of China(2015CB251100)Program of Beijing Higher Institution Engineering Research Center of Pow er Battery and Chemical Energy Materials~~
