【作者】 宰建陶； 钱雪峰；

【Author】 Jiantao Zai;Xuefeng Qian;Electrochemical Energy Devices Research Center,School of Chemistry and Chemical Engineering and State Key Laboratory of Metal Matrix Composites,Shanghai Jiao Tong University;

【机构】 上海交通大学化学化工学院和金属基复合材料国家重点实验室,上海电化学能源器件工程技术研究中心；

【摘要】 过渡金属硫化物以其明显高于嵌锂型材料的比容量受到研究者广泛关注。但是由于多电子转移反应的特性其转化反应的可逆性较差,导致低电位脱锂过程中金属硫化物难以再生。未反应的Li₂S在高电位下被氧化为多硫离子,其易于溶解到电解质的特性减少了电极中Li₂S进一步阻碍了金属硫化物的再生,最终导致该类材料循环稳定性较差。基于此,我们通过构建多级结构-石墨烯复合物优化同时提高电子导电、离子扩散性[1]和利用限域的原位转化反应提高了转化反应的可逆性,促进了金属硫化物的再生、抑制了多硫离子的形成,最终提高了材料的循环稳定性。更多还原

【Abstract】 The poor cycling stability of transition-metal sulfides with higher theoretical capacities are derived from their irreversible conversion process,which lead to the oxidation of Li₂S to the formation of dissolving polysulfides.Thus,the regeneration of metal sulfides during the dehthiation process is the key to achieving cyclic stability in electrode materials.Graphene-supported peony-like MoS₂ and localized metal sulfide nanocomposites have been designed to promote the regeneration of metal sulfide,which can further enhance their cycling stability.更多还原