(1. 福建猛獅新能源科技有限公司，漳州 363000；
2. 中南大學 冶金與環(huán)境學院，長沙 410083)
摘 要: 以模板法合成介孔碳并作為載硫基底制備硫/介孔碳復合材料。采用電化學方法對硅碳負極預鋰化，并與硫/介孔碳正極匹配構(gòu)建高性能預鋰化硅-硫全電池。結(jié)果表明：當全電池的負極鋰容量過量正極約20 %時，預鋰化硅-硫全電池初始容量為1069 mA？h/g，能量密度為590 Wh/kg。循環(huán)100圈后，電池容量為603 mA？h/g，對應容量保持率為56.4 %。同時，硅碳極片的引入對電池阻抗影響較小，正負極極片結(jié)構(gòu)在循環(huán)后依然保持穩(wěn)定。通過改變硅碳負極鋰容量研究其對全電池性能的影響，全電池循環(huán)性能在負極容量過量系數(shù)約為50 %時最佳，循環(huán)100圈后放電比容量達到650 mA？h/g。
關(guān)鍵字: 預鋰化；全電池；電化學性能；硅碳負極；鋰-硫電池
（1. Fujian Dynabat New Energy Science and Technology Co., Ltd., Zhangzhou 363000, China;
2. School of Metallurgy and Environment, Central South University, Changsha 410083, China）
Abstract:The mesoporous carbon was prepared by template method and served as the substrate for sulfur to obtain the sulfur/mesoporous carbon (S/MPC) composites. The silicon/carbon (Si/C) anode was lithiated through electrochemical method, and matched with S/MPC cathode to configure advanced prelithiated Si-S full cell. The results show that while the capacity of anode is controlled about 20% excess to the theoretical capacity of S/MPC cathode, the full cell delivers an initial specific capacity of 1069 mA？h/g and energy density of 590 Wh/kg. After 100 cycles, the full cell still keeps capacity of 603 mA？h/g and capacity retention of 56.4%. The electrochemical impedance test indicates that the employ of prelithiated Si/C anode has little influence on battery. And the structure of S/MPC cathode and Si/C anode still keeps reliable after cycling. Moreover, the electrochemical performance of prelithiated Si-S full cells using different prelithiated capacity of Si/C anodes was also studied. The optimal electrochemical performance is obtained while the anode is about 50% excess to the sulfur cathode, delivering 650 mA？h/g after 100 cycles.
Key words: lithiated anode; full cell; electrochemical performance ; Si/C anode; lithium-sulfur battery
