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基于稳定化金属锂粉的锂离子电池负极材料预锂化行为及其作用机制研究

批准号51602046 学科分类无机非金属能量存储材料 ( E021002 )
项目负责人廖丽霞 负责人职称讲师 依托单位东北林业大学
资助金额20.00
万元
项目类别青年科学基金项目 研究期限2017 年 01 月 01 日 至
2019 年 12 月 31 日
中文主题词锂离子电池;SEI ; 表面修饰;高容量;负极材料
英文主题词Lithium ion battery;Solid electrolyte interphase;Surface modification;High capacity;Anode material

摘要

中文摘要 锂离子电池较低的续航能力制约了其在电动汽车的应用,减小电极不可逆容量损失,提高电极循环稳定性能对解决这一问题至关重要。应用稳定化金属锂粉SLMP(Li/Li2CO3核壳结构材料)对电极进行预锂化是改善该性能的有效方式之一。本项目拟将SLMP应用到硅电极中,并对Li2CO3壳层进行修饰改性,探究电极预锂化动力学行为,解析预锂化过程中电极/电解液界面SEI膜成膜机理,从而深入揭示SLMP对电极电化学性能的改善机制,并获取减小不可逆容量损失和提高电极循环稳定性的实验方案。本研究可为预锂化试剂的高效应用提供理论支持和实验帮助,并对推进硅基、锡基及过渡金属氧化物等高容量负极材料的商用应用化进程具有重要的研究意义。
英文摘要 The application of electric vehicles was limited owing to the poor endurance of lithium ion battery. It is very important to solve the problem by reducing the irreversible capacity loss and enhancing the cycling stability. Prelithiation of electrode is an effective method to improve the performance. In this project, stabilized lithium metal powder(SLMP) was applied in silicon electrode, and the shell of Li2CO3 was modified. The prelithiation dynamics behavior of electrode was investigated, the formation mechanism of the SEI film formed on the electrode/electrolyte interface was analyzed. Meanwhile, the improving mechanism on the effect of SLMP on electrochemical performance of the electrode was revealed, and the experimental scheme on reducing the irreversible capacity loss and enhancing the cycling stability was proposed. This research will provide the theoretical support and experimental guidance for the efficient application of prelithiation reagent, and it is important to advance the process of the commercial application for the anode materials with high capacity including silicon, Tin, transition metal oxides and so on.
结题摘要

成果

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