电解质
材料科学
阳极
溶剂化
阴极
离子
锂(药物)
电化学
化学工程
金属
无机化学
化学物理
化学
物理化学
电极
有机化学
内分泌学
工程类
冶金
医学
作者
Yaoyao Li,Yuanpeng Liu,Lanxin Xue,Wei Chen,Tianyu Lei,Anjun Hu,Jianwen Huang,Xuepeng Wang,Xianfu Wang,Bo Chen,Yin Hu,Chengtao Yang,Jie Xiong
出处
期刊:Nano Energy
[Elsevier]
日期:2022-02-01
卷期号:92: 106708-106708
被引量:13
标识
DOI:10.1016/j.nanoen.2021.106708
摘要
Lithium metal batteries (LMBs) have great potential for next-generation rechargeable batteries due to the high theoretical capacity and ideal compatibility coupled with diverse cathode materials. However, the random Li deposition associated with the large local space charge caused by the anion depletion near the surface of anode, as well as the insufficient reduction of Li+ related to the suppressed Li+ solvation process induced by the electrostatic force between anion and cation hinder the development of high-energy-density LMBs. Herein, as evidenced theoretically and experimentally, we simultaneously eliminate the anion depletion region and promote the lithium salt dissociation by employing ZIF-67 with unsaturated metal sites as anionphilic additive to regulate anion distribution and weaken its bond with Li+. As a result, the short-circuit hazard is remitted in symmetrical cell with modified electrolyte at 3 mA cm−2 under capacity of 3 mAh cm−2 for more than 2000 h. As employed for the lithium-sulfur battery with high sulfur loading of 4.5 mg cm−2, the modulated electrolyte enables the battery delivering an initial capacity of 713 mAh g−1 with decay rate of 0.05% per cycle over 100 cycles at 3 mA cm−2. This work demonstrates an efficient and scalable strategy for constructing dendrite-free LMBs via eliminating the anion depletion region and facilitating the Li+ solvation process.
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