法拉第效率
锂(药物)
材料科学
成核
寄主(生物学)
电极
金属锂
导电体
纳米技术
金属
化学工程
电解质
复合材料
化学
冶金
物理化学
有机化学
内分泌学
工程类
生物
医学
生态学
作者
Shuang Zhou,Xinyu Meng,Chunyan Fu,Jing Chen,Yining Chen,Dongming Xu,Shangyong Lin,Chao Han,Zhi Chang,Anqiang Pan
出处
期刊:Small
[Wiley]
日期:2023-03-03
卷期号:19 (21)
被引量:7
标识
DOI:10.1002/smll.202207764
摘要
Lithium-metal shows promising prospects in constructing various high-energy-density lithium-metal batteries (LMBs) while long-lasting tricky issues including the uncontrolled dendritic lithium growth and infinite lithium volume expansion seriously impede the application of LMBs. In this work, it is originally found that a unique lithiophilic magnetic host matrix (Co3 O4 -CCNFs) can simultaneously eliminate the uncontrolled dendritic lithium growth and huge lithium volume expansion that commonly occur in typical LMBs. The magnetic Co3 O4 nanocrystals which inherently embed on the host matrix act as nucleation sites and can also induce micromagnetic field and facilitate a targeted and ordered lithium deposition behavior thus, eliminating the formation of dendritic Li. Meanwhile, the conductive host can effectively homogenize the current distribution and Li-ion flux, thus, further relieving the volume expansion during cycling. Benefiting from this, the featured electrodes demonstrate ultra-high coulombic efficiency of 99.1% under 1 mA cm-2 and 1 mAh cm-2 . Symmetric cell under limited Li (10 mAh cm-2 ) inspiringly delivers ultralong cycle life of 1600 h (under 2 mA cm-2 , 1 mAh cm-2 ). Moreover, LiFePO4 ||Co3 O4 -CCNFs@Li full-cell under practical condition of limited negative/positive capacity ratio (2.3:1) can deliver remarkably improved cycling stability (with 86.6% capacity retention over 440 cycles).
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