Pyramid-Patterned Germanium Composite Film Anode for Rechargeable Lithium-Ion Batteries Prepared Using a One-Step Physical Method

Author:

Wang Liyong1ORCID,Wang Mei1,Jiao Liansheng2,Wang Huiqi1,Yang Jinhua13,Dong Xiaozhong4,Bi Ting1,Ji Shengsheng1,Liu Lei1,Hu Shengliang1,Chen Chengmeng5,Guo Quangui5,Liu Zhanjun5

Affiliation:

1. School of Energy and Power Engineering, North University of China, Taiyuan 030001, China

2. School of Chemistry and Chemical Engineering, Hebei Normal University for Nationalities, Chengde 067000, China

3. National Key Laboratory of Advanced Composites, AECC Beijing Institute of Aeronautical Materials, Beijing 100095, China

4. Department of Materials Engineering, Taiyuan Institute of Technology, Taiyuan 030001, China

5. CAS Key Laboratory of Carbon Materials, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China

Abstract

Using a top-down magnetron sputtering technique with a high deposition-rate, a one-step method for preparing germanium (Ge) hybrid film is presented. At present, graphite film is used as a current collector because it is flexible, self lubricating, and possesses a stress–strain-relieving property. In order to further suppress the volume changes of the Ge, a multilayered electrically conductive nickel film is deposited between multilayered Ge films. The cells are cycled at a current density of 200 mA g−1. An initial discharge and charge capacity of 1180.7 and 949.3 mAh g−1 are achieved by the prepared integrated pyramid patterned Ge composite film anode, respectively. The average capacity was maintained at 580 mAh g−1 after 280 cycles. In the rate capability measurement, the Ge composite demonstrated a reversible capacity of 1163.1 mAh g−1. It is easily made using magnetron sputtering, which is widely accepted in the industry. A physical approach to increase pure Ge’s specific capacity and its cycle life for LIBs is demonstrated in this work.

Funder

Fundamental Research Program of Shanxi Province

Key Research and Development (R&D) Projects of Shanxi Province

Graduate Student Education Innovation Projects of Shanxi Province

Publisher

MDPI AG

Subject

Materials Chemistry,Surfaces, Coatings and Films,Surfaces and Interfaces

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