期刊
NANO LETTERS
卷 20, 期 1, 页码 546-552出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.9b04278
关键词
Fe/LiF/Li2O nanocomposite; cathode prelithiation; initial lithium loss; stability; lithium-ion batteries
类别
资金
- Natural Science Foundation of China [51802105]
- Innovation Fund of Wuhan National Laboratory for Optoelectronics
- Singapore National Research Foundation [NRF-NRFF2017-04]
Lithium-ion batteries (LIBs) are currently dominating the portable electronics market and supplying power for electric vehicles and grid level storage. However, lithium loss in the formation cycle at the anode side reduces the energy density of state-of-the-art LIBs with carbon anode materials. This situation will be even more severe for future LIBs using high-capacity Si based anode materials. In this study, a transition metal-based nanocomposite with built-in lithium source was synthesized, featuring Fe nanodomains with a size of similar to 5 nm uniformly dispersed in a hybrid Li2O and LiF matrix with intimate contact between them. The Fe/LiF/Li2O nanocomposite released a high Li-ion capacity of 550 mA h/g based on a multielectron inverse conversion reaction during the first-cycle charge process and exhibited better ambient stability than the counterpart with a pure Li2O matrix and also a lower lithium-extraction voltage and faster reaction kinetics than the counterpart with a pure LiF matrix. Serving as an additive to various cathodes (e.g., LiCoO2, LiFePO4, and LiNi(1-x-y)Go(x)Mn(y)O(2)), the Fe/LiF/Li2O nanocomposite showed excellent lithium compensation effect. Using 4.8 wt % Fe/LiF/Li2O additive based on the total mass of the electrodes, a LiNi0.8Co0.1Mn0.1O2 vertical bar SiO-graphite full cell with a high cathode mass loading of 20 mg/cm(2) exhibited a high reversible capacity of 2.9 mA h/cm(2) at 0.5 C after 100 cycles which is a 15% increase in comparison to the counterpart without the prelithiation additive. After the Fe/LiF/Li2O nanocomposite was immersed into the electrolyte and rested for 72 h, the content of iron metal in the electrolyte was negligible, indicating that this prelithiation additive was stable in the electrolyte and would not cause any side reactions, such as the shuttle of iron ions during cycling. The high donor Li-ion capacity, good ambient stability, and its compatibility with existing cathode materials and battery fabrication processes make the Fe/LiF/Li2O nanocomposite a promising cathode prelithiation additive to offset the initial lithium loss and improve the energy density of LIBs.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据