期刊
JOURNAL OF POWER SOURCES
卷 406, 期 -, 页码 63-69出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2018.10.002
关键词
Lithium dendrite suppression; Polyvinylidene difluoride; Graphite anode Safety; Over-lithiation; Fast-charge
资金
- Advanced Research Center for Green Materials Science and Technology from The Featured Area Research Center Program [107L9006]
- Ministry of Science and Technology, Taiwan [MOST-107-3017-F-002-001, MOST-104-2923-M-002-011-MY3, MOST-106-2923-E-011-005, MOST-107-2221-E-002 -106 -MY3]
Dendritic Li deposition on graphite anodes of Li-ion batteries (LIBs) not only deteriorates the anode performance but also causes safety concerns. We demonstrate here a proof-of-concept graphite anode containing a polymer coating that effectively mitigates Li dendrite formation under harsh lithiation conditions. It is shown that Li dendrites with dimensions ranging from a few tens nanometers to microns occur readily on granular graphite electrodes either under 20% over-lithiation at 0.2C or fast lithiation up to 10C rate. In contrast, the graphite anode with a conformal thin coating of high-polarity beta-phase polyvinylidene difluoride (PVDF) on graphite particles exhibits dendrite-free Li plating under either condition. Moreover, the PVDF coated graphite anode exhibits substantially improved cycling stability with high Coulombic efficiencies under the Li-plating conditions. The rise of charge-transfer resistance due to over-lithiation is reduced. The proof of concept for adopting a dendrite-suppressing polymer coating on graphite anodes offers a new strategy for improving battery safety and renders more options for cell design in enhancing energy and power performances for the state-of-the-art 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