(1. 福建猛狮新能源科技有限公司，漳州 363000；
2. 中南大学 冶金与环境学院，长沙 410083)
摘 要: 以模板法合成介孔碳并作为载硫基底制备硫/介孔碳复合材料。采用电化学方法对硅碳负极预锂化，并与硫/介孔碳正极匹配构建高性能预锂化硅-硫全电池。结果表明：当全电池的负极锂容量过量正极约20 %时，预锂化硅-硫全电池初始容量为1069 mA？h/g，能量密度为590 Wh/kg。循环100圈后，电池容量为603 mA？h/g，对应容量保持率为56.4 %。同时，硅碳极片的引入对电池阻抗影响较小，正负极极片结构在循环后依然保持稳定。通过改变硅碳负极锂容量研究其对全电池性能的影响，全电池循环性能在负极容量过量系数约为50 %时最佳，循环100圈后放电比容量达到650 mA？h/g。
关键字: 预锂化；全电池；电化学性能；硅碳负极；锂-硫电池
（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
