Details

Autor(en) / Beteiligte

• Zhang, Ying
• Luo, Wei
• Wang, Chengwei
• Li, Yiju
• Chen, Chaoji
• Song, Jianwei
• Dai, Jiaqi
• Hitz, Emily M.
• Xu, Shaomao
• Yang, Chunpeng
• Wang, Yanbin
• Hu, Liangbing

Titel

High-capacity, low-tortuosity, and channel-guided lithium metal anode

Ist Teil von

• Proceedings of the National Academy of Sciences - PNAS, 2017-04, Vol.114 (14), p.3584-3589

Ort / Verlag

United States: National Academy of Sciences

Erscheinungsjahr

2017

Link zum Volltext

Quelle

Free E-Journal (出版社公開部分のみ）

Beschreibungen/Notizen

• 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 overpotential (90 mV at 3 mA·cm−2), more-stable stripping/plating profiles, and better cycling performance (∼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.