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因为硒的高电子电导,以及和硫相近的体积能量密度,锂硒电池继锂硫电池之后受到越来越多的关注.本论文使用蔗糖作为碳源,通过水热方法合成碳球,经KOH造孔,从而得到了具有微孔结构的多孔碳球.进一步和单质硒进行热复合制备了Se/C复合材料作为锂硒电池的正极材料,该复合材料在碳酸酯的电解液中表现出高的活性物质利用率、稳定的循环性能和良好的倍率性能.其优异的电化学性能主要得益于Se/C复合材料的电子导电能力的改善,以及硒在碳酸酯电解液中的“固-固”电极过程.本工作关于碳酸酯电解液和醚类电解液用于锂硒电池的系统研究对今后锂硒电池电解液的选择有一定的参考意义.
Due to the high electronic conductivity of selenium and the volumetric energy density similar to that of sulfur, lithium-selenium batteries are receiving more and more attention after lithium-sulfur batteries.In this paper, sucrose was used as a carbon source to synthesize carbon spheres by hydrothermal method, And then porous carbon spheres with micropore structure were obtained.Se / C composites were also prepared by thermal compaction with elemental selenium as the positive electrode material for lithium-selenium batteries, which showed high in carbonate electrolyte Of active material utilization, stable cycling performance and good rate performance.The excellent electrochemical performance is mainly due to the improvement of electronic conductivity of Se / C composite material, and the selenium content in carbonate electrolyte - solid "electrode process.This work on the carbonate electrolyte and ether electrolyte for lithium-selenium battery system for the future of lithium-selenium battery electrolyte choice has some reference value.