期刊
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
卷 114, 期 14, 页码 3584-3589出版社
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1618871114
关键词
lithium metal batteries; wood channels; low tortuosity; stable cycling; high capacity
资金
- US Department of Energy, Advanced Research Projects Agency-Energy Project [DE-AR 0000726]
- Nanostructures for Electrical Energy Storage, an Energy Frontier Research Center - US Department of Energy, Office of Science, Basic Energy Sciences [DESC0001160]
- China Scholarship Council [CSC 201506680044]
- Key Laboratory of Superlight Materials and Surface Technology of Ministry of Education, College of Materials Science and Chemical Engineering, Harbin Engineering University
Lithium metal anode with the highest capacity and lowest anode potential is extremely attractive to battery technologies, but infinite volume change during the Li stripping/plating process results in cracks and fractures of the solid electrolyte interphase, low Coulombic efficiency, and dendritic growth of Li. Here, we use a carbonized wood (C-wood) as a 3D, highly porous (73% porosity) conductive framework with well-aligned channels as Li host material. We discovered that molten Li metal can infuse into the straight channels of C-wood to form a Li/C-wood electrode after surface treatment. The C-wood channels function as excellent guides in which the Li stripping/plating process can take place and effectively confine the volume change that occurs. Moreover, the local current density can be minimized due to the 3D C-wood framework. Therefore, in symmetric cells, the as-prepared Li/C-wood electrode presents a lower over-potential (90 mV at 3 mA.cm(-2)), more-stable stripping/plating profiles, and better cycling performance (similar to 150 h at 3 mA.cm(-2)) compared with bare Li metal electrode. Our findings may open up a solution for fabricating stable Li metal anode, which further facilitates future application of high-energy-density Li metal batteries.
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