Yttrium trihydride enhanced lithium storage in carbon materials
Yttrium trihydride enhanced lithium storage in carbon materials
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三氢化钇增强碳材料中的锂存储
DOI：
10.1016/j.carbon.2020.04.020
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发表时间：
2020
期刊：
影响因子：
10.9
通讯作者：
Li Xingguo
中科院分区：
文献类型：
--
作者：
Zheng Xinyao;Li Guoling;Guo Yanru;Yu Hongen;Li Shuan;Xiao Rui;Zheng Jie;Li Xingguo
金属氧化物（MHx）作为锂离子电池的负极材料越来越受到关注。最广泛接受的MH的锂储存机制是形成LiH的转化机制。我们的前期研究表明，稀土三氢化物（REH 3，RE = Y，La和Gd）-石墨复合材料的储锂机理不同：REH 3-REH 2转化释放的活性氢可能通过形成Li-C-H复合材料提高石墨的储锂容量。在这项工作中，这一有趣的现象是进一步研究，通过比较使用不同的碳材料：石墨，乙炔黑，活性炭和商业石墨烯的YH 3/碳复合材料的储锂性能。通过添加YH 3增强的锂储存容量仅在石墨中观察到，表明完整的层状石墨烯结构在这种新的锂储存机制中起着重要作用。
Metal hydrides (MHx) are gaining increasingly interest as anode materials for lithium ion batteries. The most widely accepted lithium storage mechanism for MHxis the conversion mechanism to form LiH. Our previous study suggested a different lithium storage mechanism of rare earth trihydride (REH3, RE = Y, La and Gd)-graphite composite: the reactive H released from the REH3-REH2conversion may enhance the lithium storage capacity of graphite by forming a Li–C–H composite. In this work, this interesting phenomenon is further studied by comparing the lithium storage performance of YH3/carbon composite using different carbon materials: graphite, acetylene black, activated carbon and commercial graphene. The enhanced lithium storage capacity by YH3addition is only observed for graphite, indicating the essential role of the intact layered graphene structure in this new lithium storage mechanism.