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Energy, Environmental, and Catalysis Applications
Pre-lithiated Surface Oxide Layer Enabled High Performance Si Anode for Lithium Storage Yuanchao Zhu, Wei Hu, Jianbin Zhou, Wenlong Cai, Yue Lu, Jianwen Liang, Xiaona Li, Shanshan Zhu, Qi-Qi Fu, and Yitai Qian ACS Appl. Mater. Interfaces, Just Accepted Manuscript • DOI: 10.1021/acsami.8b22507 • Publication Date (Web): 02 May 2019 Downloaded from http://pubs.acs.org on May 2, 2019
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ACS Applied Materials & Interfaces
Pre-lithiated Surface Oxide Layer Enabled High Performance Si Anode for Lithium Storage Yuanchao Zhu,§,† Wei Hu,§,‡ Jianbin Zhou,*,† Wenlong Cai,† Yue Lu,† Jianwen Liang,† Xiaona Li,† Shanshan Zhu,† Qiqi Fu,∥ Yitai Qian*,† †
Department of Chemistry, University of Science and Technology of China, and Hefei
National Laboratory for Physical Science at Microscale, Hefei, Anhui Province 230026, P. R. China ‡
Shandong Provincial Key Laboratory of Molecular Engineering, Qilu University of
Technology, Jinan, Shandong Province, 250353, P. R. China ∥Institute
of Flexible Electronic Technology of Tsinghua, Jiaxing, Zhejiang Province,
314000, P. R. China §Y.
C. Zhu and W. Hu contributed equally to this work.
KEYWORDS: Surface modification, Pre-lithiated SiOx, LiBH4, selective pre-lithiation, Si anode, Lithium ion batteries ABSTRACT: SiOx coating is an effective strategy to prolong the cycling stability of Sibased anodes due to the robust interaction between Si and SiOx layer. However, SiOx layer protected Si anode is limited by the relatively low initial coulombic efficiency and sluggish Li+ diffusion ability induced by SiOx layer. Herein, we present the preparation
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of selectively pre-lithiated Si@SiOx (Si@Li2SiO3) anode by using a facile strategy to resolve the above issues. As the anode for lithium ion batteries, Si@Li2SiO3 exhibits the high initial coulombic efficiency (ICE, 89.1%), the excellent rate performance (959 mA h g-1 at 30 A g-1), and a superior capacity retention (3215 mA h g-1). The full-cell with LiFePO4 cathode and Si@Li2SiO3 anodes is successfully assembled, disclosing a high ICE of 91.1% and excellent long cycling stability. The superior electrochemical performance of Si@Li2SiO3 can be atttributed to the coating layer, which can strengthen the integrity of electrode, decrease irreversible reaction and provide efficient Li+ diffusion channels. 1. INTRODUCTION Silicon, with a theoretical specific capacity up to 4200 mAh g-1 (based on Li22Si5), low working voltage (
