【摘 要】
：
全固态锂硫电池可抑制锂枝晶生长,且可避免多硫化物穿梭等问题,被认为是极具前景的下一代储能体系.固态正极中活性物质硫的绝缘性,使得电化学氧化还原需要离子传输和电子传递
【机 构】
：
北京理工大学前沿交叉科学研究院,北京,100081清华大学化学工程系绿色化学反应工程与技术北京市重点实验室,北京,100084;清华大学化学工程系绿色化学反应工程与技术北京市重点实验室,北京 1000
论文部分内容阅读
全固态锂硫电池可抑制锂枝晶生长,且可避免多硫化物穿梭等问题,被认为是极具前景的下一代储能体系.固态正极中活性物质硫的绝缘性,使得电化学氧化还原需要离子传输和电子传递网络的双连通.而如何平衡固态正极中离子输运与电子传递路径是实现电池稳定运行的关键.面向未来高比能储能体系,本文在40％(质量分数,下同)的高硫含量复合正极中,通过调控复合正极中电子导体碳纳米管(CNT)与离子导体Li10GeP2S12(LGPS)相对含量,借助扫描电子显微镜(SEM)、X射线衍射(XRD)与拉曼测试以及电化学测试与表征等,考察不同CNT与LGPS比例下硫正极的电子导率与离子导率,并通过对比硫正极的首圈放电容量以及在第二圈的容量保持率,从而探索正极设计的离子通路与电子通路的最优平衡条件.结果表明,硫正极中LGPS电解质含量低时,锂离子传输受阻;当LGPS电解质含量高时,电子传递阻力大且反应活性界面有限.因此,综合对比放电容量与容量保持率,可以得出40％高硫含量正极中,离子输运与电子传递的最优平衡条件是CNT和LGPS的含量分别为15％和45％,此时全固态锂硫电池首圈放电比容量621 mA·h/g,容量衰减率为3％.
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