Synergism of Rare Earth Trihydrides and Graphite in Lithium Storage: Evidence of Hydrogen-Enhanced Lithiation
发布时间：2020-05-23
点击次数：
影响因子：25.809
DOI码：10.1002/adma.201704353
所属单位：Peking Univ
发表刊物：Adv. Mater.
摘要：The lithium storage capacity of graphite can be significantly promoted by rare earth trihydrides (REH3, RE = Y, La, and Gd) through a synergetic mechanism. High reversible capacity of 720 mA h g(-1) after 250 cycles is achieved in YH3-graphite nanocomposite, far exceeding the total contribution from the individual components and the effect of ball milling. Comparative study on LaH3-graphite and GdH3-graphite composites suggests that the enhancement factor is 3.1-3.4 Li per active H in REH3, almost independent of the RE metal, which is evident of a hydrogen-enhanced lithium storage mechanism. Theoretical calculation suggests that the active H from REH3 can enhance the Li+ binding to the graphene layer by introducing negatively charged sites, leading to energetically favorable lithiation up to a composition Li5C16H instead of LiC6 for conventional graphite anode.
合写作者：Henghui, Zhou, Jing, Lu, Meng, Ye, Teng, Wang, Xinghua, Chang, Chengkai, 刘洋
第一作者：Xinyao, Zheng
论文类型：期刊论文
通讯作者：Jie, Zheng, Henghui, Zhou
一级学科：0805 材料科学与工程
文献类型：J
是否译文：否
发表时间：2018-01-01