锂硫电池作为新一代锂二次电池拥有更为广阔的发展前景,但其本身也存在一定缺陷。例如,发生在锂硫电池内部的穿梭效应,严重影响了电池的电化学性能。采取适用于工业化生产的简单方法,一步固相法合成硫化锌(ZnS),将其用于隔膜的表面修饰。结果表明,合成的ZnS是闪锌矿结构,具有不规则的块体形貌,将其涂布在隔膜正极侧表面能够有效抑制锂硫电池的穿梭效应,改善电化学循环寿命,0.1C下首次放电比容量为1090mAh/g,1C倍率下为600mAh/g,在0.5C下,可以稳定循环1000圈,平均每圈衰减率仅为0.057%。
Lithium-sulfur batteries,as novel lithium secondary batteries,have enormous potential for future energy storages.However,there are still many defects needed to be solved before their large-scale applications.For example,the shuttle effect that occurs inside lithium-sulfur batteries seriously affects the electrochemical performance of the batteries.Taking a simple method suitable for industrial production,one-step solid-phase method was used to synthesize zinc sulfide (ZnS),which was further applied for the surface modification of separators.The research results showed that the synthesized ZnS had a sphalerite structure with an irregular bulk morphology.Coating it on the positive side surface of the separator enabled effectively to inhibit the shuttle effect of lithium-sulfur batteries and improve the electrochemical cycle life.The first discharge specific capacities were 1100mAh/g at 0.1C and 600mAh/g at 1C.In addition,the lithium-sulfur batteries could be recycled 1000 times at 0.5C with only 0.057% deceasing for each cycle.
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基金资助
内蒙古民族大学博士科研基金项目(BS614);国家自然科学基金(21961024);内蒙古自然科学基金项目(2018JQ05和2019BS02007);内蒙古自治区科技成果转化资助项目(CGZH2018156和2019GG261);IMUN研究生科研项目(S20191195Z);2020年度自治区本级事业单位引进优秀人才科研启动绩效项目(RCQD20002);IMUN研究生科研项目(NMDSS2133)
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