In Situ Chemical Synthesis of Lithium Fluoride/Metal Nanocomposite for High Capacity Prelithiation of Cathodes

Nano Letters
Yongming SunYi Cui

Abstract

The initial lithium loss during the formation stage is a critical issue that significantly reduces the specific capacity and energy density of current rechargeable lithium-ion batteries (LIBs). An effective strategy to solve this problem is using electrode prelithiation additives that can work as a secondary lithium source and compensate the initial lithium loss. Herein we show that nanocomposites of lithium fluoride and metal (e.g., LiF/Co and LiF/Fe) can be efficient cathode prelithiation materials. The thorough mixing of ultrafine lithium fluoride and metal particles (∼5 nm) allows lithium to be easily extracted from the nanocomposites via an inverse conversion reaction. The LiF/Co nanocomposite exhibits an open circuit voltage (OCV, 1.5 V) with good compatibility with that of existing cathode materials and delivers a high first-cycle "donor" lithium-ion capacity (516 mA h g(-1)). When used as an additive to a LiFePO4 cathode, the LiF/Co nanocomposite provides high lithium compensation efficiency. Importantly, the as-formed LiF/metal nanocomposites possess high stability and good compatibility with the regular solvent, binder, and existing battery processing conditions, in contrast with the anode prelithiation materials that...Continue Reading

Citations

Jul 28, 2016·Chemical Society Reviews·Zhi Wei SehYi Cui
Jul 8, 2017·Chemical Communications : Chem Comm·Yitian BieYanna Nuli
Apr 19, 2017·Proceedings of the National Academy of Sciences of the United States of America·Dingchang LinYi Cui
Jan 23, 2021·Nature Materials·Xiao HuaClare P Grey
Jun 25, 2021·Advanced Science·Liming JinJim P Zheng
Aug 4, 2021·ACS Applied Materials & Interfaces·Zhixiang RaoYunhui Huang
Oct 20, 2017·ACS Applied Materials & Interfaces·Nan WangJiulin Wang
Mar 19, 2020·ACS Applied Materials & Interfaces·Joshua J WaltonGraham Sandford
Feb 20, 2019·ACS Applied Materials & Interfaces·Gongwei WangDeyang Qu

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