期刊
ENERGY STORAGE MATERIALS
卷 22, 期 -, 页码 29-39出版社
ELSEVIER
DOI: 10.1016/j.ensm.2018.12.020
关键词
Defect-rich surface; Dendrite-free Li plating; Highly-lithiophilic host; Lithium-metal battery; Plasma-enhanced CVD; Vertical erected graphene nanowalls
资金
- National Natural Science Foundation of China [51622208, 21875155, 51872193, 51675275, 21473119, 51702225]
- Jiangsu Youth Science Foundation [BK20170336]
- Suzhou Key Laboratory for Advanced Carbon Materials and Wearable Energy Technologies, Suzhou, China
Lithium (Li) metal has been recognized as an ultimate anode material for the next-generation rechargeable batteries. However, the challenges induced by Li dendrites on a working Li anode would cause cell short and expose the Li-metal batteries to wide safety concerns. The design of Li plating hosts that synergize excellent conductivity, unique nano-architecture and superb lithiophilic nature has been proven to be one of the most promising strategies to alleviate the dendrite issue of Li. Nevertheless, current 3-dimensional conductive hosts still need to be further improved to meet the vast Li deposition under high power conditions. Herein, vertical erected graphene nanowall-coated copper foams (Cu@VG) prepared via plasma-enhanced chemical vapor deposition are adopted as highly lithiophilic host materials to regulate Li nucleation and suppress dendrite growth. The unique design of the Cu@VG host is featured by its flexibility, huge reaction interface and ample lithiophilic sites (topological defects and oxygen-containing groups), which enables a dendrite-free morphology and a high cycling efficiency over 99.0% and excellent cycling stability up to 1875 cycles at a high current density of 5 mA cm(-2). The combined advantages of the Cu@VG host also guarantee the construction of Cu@VG@Li parallel to LiNi0.5Co0.2Mn0.3O2 full cells with enhanced rate capability and prolonged lifespan.
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