文献类型：期刊文献

英文题名：Metal oxide nanoparticles induced step-edge nucleation of stable Li metal anode working under an ultrahigh current density of 15 mA cm(-2)

作者：Jin, Chengbin[1] Sheng, Ouwei[1] Lu, Yun[2] Luo, Jianmin[1] Yuan, Huadong[1] Zhang, Wenkui[1] Huang, Hui[1] Gan, Yongping[1] Xia, Yang[1] Liang, Chu[1] Zhang, Jun[1] Tao, Xinyong[1]

第一作者：Jin, Chengbin

通信作者：Tao, XY[1]

机构：[1]Zhejiang Univ Technol, Coll Mat Sci & Engn, Hangzhou 310014, Zhejiang, Peoples R China;[2]Chinese Acad Forestry, Res Inst Wood Ind, Yard 1,Xiangshan Rd, Beijing 100091, Peoples R China

年份：2018

卷号：45

起止页码：203-209

外文期刊名：NANO ENERGY

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000425396400022)】；

基金：The authors acknowledge financial support from the National Natural Science Foundation of China (Grant nos. 51722210, 51572240, 31500468, 21403196 and 51677170), the Natural Science Foundation of Zhejiang Province (Grant nos. LD18E020003, LY16E070004 and LY18B030008) and Ford Motor Company.

语种：英文

外文关键词：Li secondary batteries; Balsa wood; Nanoscale step; Step-edge-guided effect; Ultrahigh current density

摘要：Lithium (Li) metal has been regarded as promising candidate anode to upgrade the energy density of Li secondary batteries. However, uncontrollable formation of Li dendrite, serious volumetric change, undesirable side reaction and poor mechanical properties of solid electrolyte interphase (SEI) layer impede the commercialization of this technology. By ex-situ observing the initial Li deposition process and conducting electrochemical test, we firstly confirm the prior nucleation behavior of Li metal at the step edge area. We thus employ a balsa wood derived porous carbon matrix as Li host and metal oxide nanoparticles are introduced to increase the nanoscale step amounts for Li nucleation. Hence, the Li nucleation overpotential is reduced and Li can be well accommodated within carbon matrix. Moreover, this step-edge-guided effect could promise the Li striping/plating to happen mainly around the steps area within channels, achieving a dendrite-free anode. Consequently, the modified Li anode is capable of working under an ultrahigh current density of 15 mA cm(-2) with a Coulombic efficiency of similar to 96% and exhibit lower nucleation overpotential, more satisfactory cycling stability. And when in pair with commercial LiCoO2 cathode, it shows better rate performance and higher capacity compared with bare Li foil.