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In Situ Conversion of Cu 3 P Nanowires to Mixed Ion/Electron‐Conducting Skeleton for Homogeneous Lithium Deposition
Author(s) -
Sun Changzhi,
Lin Aming,
Li Wenwen,
Jin Jun,
Sun Yiyang,
Yang Jianhua,
Wen Zhaoyin
Publication year - 2020
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.201902989
Subject(s) - materials science , faraday efficiency , lithium (medication) , anode , chemical engineering , alloy , ion , nanowire , nanotechnology , electrode , composite material , chemistry , medicine , engineering , organic chemistry , endocrinology
The introduction of 3D wettable current collectors is one of the practical strategies toward realizing high reversibility of lithium (Li) metal anodes, yet its effect is usually insufficient owing to single electron‐conductive skeleton. Here, homogeneous Li deposition behavior and enhanced Coulombic efficiency is reported for electrochemically lithiated Cu 3 P nanowires, owing to the formation of a mixed ion/electron‐conducting skeleton (MIECS). In particular, by evaluating the Gibbs free energy change, the possible chemical reaction between Cu 3 P and molten Li is used to construct a MIECS containing Li 3 P and Cu–Li alloy phase. The successful conversion of Cu 3 P nanowires to Li 3 P and Cu–Li alloy nanocomposite not only greatly reduces the surface energy between molten Li and Cu 3 P, but also induces uniform Li stripping/plating behavior via balanced ion/electron transport. Thus, the as‐obtained Li@MIECS composite anode displays superior cycling stability in both symmetric cells and full cells. This work provides a promising option for the preparation of high‐performance composite Li anodes containing MIECS by thermally pre‐storing Li.