阳极
锂(药物)
材料科学
电解质
碳纳米纤维
纳米纤维
碳纤维
化学工程
石墨
纳米技术
离子
电化学
密度泛函理论
碳纳米管
化学
复合材料
电极
有机化学
物理化学
计算化学
复合数
内分泌学
工程类
医学
作者
Muxuan Li,Junsheng Yuan,Mengjing Jin,Xia Ni,Chang Peng,Guowen Sun,Xiaojun Pan
出处
期刊:Small
[Wiley]
日期:2024-11-05
标识
DOI:10.1002/smll.202407919
摘要
Abstract The hard carbon (HC) anode materials demonstrate high capacity and excellent rate performance in lithium‐ion batteries. However, HC anodes suffer from excessive loss of Li + ions during the formation of the solid electrolyte interphase (SEI) film, leading to poor cycling stability, which hinders their large‐scale applications. Herein, a facile pre‐lithiation strategy is proposed to achieve multi‐functional precompensation of carbon nanofibers (CNFs) anodes. Both experimental and density functional theory (DFT) calculation results revealed that the strategy compensated for the loss of Li + ions and reacted with four structures of CNFs during pre‐lithiation, including tiny graphite domains, CO‐containing functional groups, defects, and micropores. Furthermore, the lithium in pre‐lithiated carbon nanofibers (pCNFs) existed in various forms, consisting of LiC 24 and LiC 18 , Li─O─C, quasi‐metallic lithium, and Li + ions. Moreover, the uniformly distributed lithium on the surface of pCNFs induced the formation of denser and more robust LiF/Li 2 CO 3 ‐rich SEI film, which promoted Li + ions transport. As a result, pCNFs showed more stable cycling performance (369.8 mAh g −1 , almost no decay for 1500 cycles). This work provides deeper insight into chemical pre‐lithiation and offers a simple and mild strategy for highly stable batteries.
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