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Lee, Hyun-Wook
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In Situ Chemical Synthesis of Lithium Fluoride/Metal Nanocomposite for High Capacity Prelithiation of Cathodes

Author(s)
Sun, YongmingLee, Hyun-WookZheng, GuangyuanSeh, Zhi WeiSun, JieLi, YanbinCui, Yi
Issued Date
2016-02
DOI
10.1021/acs.nanolett.5b05228
URI
https://scholarworks.unist.ac.kr/handle/201301/18401
Fulltext
http://pubs.acs.org/doi/abs/10.1021/acs.nanolett.5b05228
Citation
NANO LETTERS, v.16, no.2, pp.1497 - 1501
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 usually suffer from issues of high chemical reactivity and instability. The facile synthesis route, high stability in ambient and battery processing conditions, and high “donor” lithium-ion capacity make the LiF/metal nanocomposites ideal cathode prelithiation materials for LIBs.
Publisher
AMER CHEMICAL SOC
ISSN
1530-6984

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