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3D Carbon Coating Enabled High‐capacity and Stable Micro‐sized Silicon Suboxide‐graphite Blended Anodes for Practical Lithium‐ion Batteries

Journal Article · · Batteries & Supercaps
 [1];  [2];  [2];  [2];  [1];  [3];  [2];  [2]
  1. Shanghai Shanshan Tech Co. Ltd. Shanghai 201209 China
  2. Key Laboratory of Advanced Ceramics and Machining Technology (Ministry of Education) School of Materials Science and Engineering Tianjin University Tianjin 300072 China; Tianjin Key Laboratory of Composite and Functional Materials School of Materials Science and Engineering Tianjin University Tianjin 300072 China
  3. College of Chemical and Biological Engineering Zhejiang University Hangzhou 310027 China
Abstract

Silicon oxide (SiOx) is a promising anode candidate of lithium‐ion batteries (LIBs) owing to its extremely high specific capacity. However, the low initial Coulombic efficiency (ICE) and rapid capacity degradation of SiOx, triggered by the enormous volume variation upon repeated (de)lithiation, gravely hinder its practical use. Herein, two mass‐produced micro‐sized SiOx@C composites with obviously different morphologies for commercial LIBs are reported. Particularly, the SiOx‐graphite blended anode (SiOx@3D‐G‐Gr) based on SiOxwrapped by three‐dimensional (3D) carbon layers (SiOx@3D‐G) exhibits a capacity of 519 mAh g−1, an ICE of 90.0 % and a capacity retention of 83.4 % at 0.2 C over 100 cycles. which is far exceeding its counterpart SiOx@C‐H‐Gr (65.7 %). The obtained impressive properties of SiOx@3D‐G originate from the critical contribution of 3D carbon layers, which serves as the effective stress buffer and protective layer as well as the strong networks for electron/Li+transport. Accordingly, the full‐cell based on SiOx@3D‐G‐Gr anode and commercial LiCoO2cathode delivers a capacity of 803 mAh and an excellent capacity retention of 95.6 % (616 mAh, 96.6 % for graphite, respectively) at 1 C over 100 cycles with a stabilized CE of nearly 100 %. The micro‐sized SiOx@3D‐G showing a promising prospect in the commercial‐grade anodes in LIBs.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Organization:
USDOE
DOE Contract Number:
AC02-06CH11357
OSTI ID:
2423258
Journal Information:
Batteries & Supercaps, Journal Name: Batteries & Supercaps Journal Issue: 8 Vol. 6; ISSN 2566-6223
Publisher:
Wiley
Country of Publication:
United States
Language:
English

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