材料科学
电解质
复合数
化学工程
成核
金属泡沫
阳极
极化(电化学)
枝晶(数学)
金属
复合材料
锂(药物)
电极
冶金
化学
物理化学
内分泌学
有机化学
工程类
医学
数学
几何学
作者
Runhao Zhang,Yong Li,Meng Wang,Dongwei Li,Junjie Zhou,Lei Xie,Tao Wang,Tian Wang,Yanjie Zhai,Hongyu Gong,Meng Gao,Kang Liang,Pu Chen,Biao Kong
出处
期刊:Small
[Wiley]
日期:2021-05-03
卷期号:17 (23)
被引量:44
标识
DOI:10.1002/smll.202101301
摘要
Abstract Achieving uniform lithium (Li) deposition is the key to tackle uncontrollable dendrite growth, which hinders the application of Li metal anodes. In this study, molten Li is thermally injected into a 3D framework by growing lithiophilic CoO nanosheets on Cu foam (CF). The CoO layer grown on the CF surface physically adsorbs molten Li, which makes it possible to spontaneously wet the framework. The morphology of CoO nanosheets does not change during the Li injection process and formed a multi‐level structure with the CF, which is difficult to be achieved previously, as most lithiophilic oxides undergo serious chemical changes due to chemical reaction with Li and cannot provide a stable submicron structure for the subsequent Li stripping/plating process. The super‐assembled multi‐level structure provides abundant Li nucleation sites and electrolyte/electrode contact areas for rapid charge transfer in the composite anode. Therefore, the prolonged lifespan of symmetrical cells for 300 cycles at 10 and 10 mAh cm −2 with lower polarization is achieved, which further renders the LiFePO 4 and Li 4 Ti 5 O 12 based full cells with improved capacity retention up to 87.3% and 80.1% after 500 cycles at 1 C. These results suggest that the composite anode has a great application prospect.
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