Details
| Original language | English |
|---|---|
| Pages (from-to) | 38556-38566 |
| Number of pages | 11 |
| Journal | ACS Applied Materials & Interfaces |
| Volume | 9 |
| Issue number | 44 |
| Publication status | Published - 2017 |
Abstract
Germanium is a promising anode material for lithium ion batteries because of its high theoretical specific capacity and low operation voltage. However, a significant challenge in using Ge-based anodes is the large volume variation during cycling that causes pulverization and capacity fade. Despite intense studies in the past decade, unsatisfactory cycling stability of the Ge-based electrodes still impedes their widespread applications. In this study, we demonstrate a high-performance electrode through the synergistic combination of a high-capacity Ge film grown on a three-dimensional current collector and an in situ formed poly(vinylidene fluoride)-hexafluoropropene/SiO 2 protective layer. Specifically, the polymer matrix is in continuous contact with the surface of the Ge shell, which provides improved mechanical and ionic transport properties. As a highlight, we present impressive cycling stability over 3000 cycles at 1 C rate with a capacity retention as high as 95.7%. Furthermore, the LiCoO 2-Ge full battery operates at an average voltage of 3.3 V at 0.5 C and maintains good electrochemical performance, suggesting great potential for applications in energy storage and conversion devices.
Keywords
- amorphous Ge anode, full cell, high electrochemical performance, lithium storage, PVDF-HFP/SiO functional coating
ASJC Scopus subject areas
- Materials Science(all)
- General Materials Science
Sustainable Development Goals
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In: ACS Applied Materials & Interfaces, Vol. 9, No. 44, 2017, p. 38556-38566.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Reinforcing Germanium Electrode with Polymer Matrix Decoration for Long Cycle Life Rechargeable Lithium Ion Batteries
AU - Sun, Xiaolei
AU - Lu, Xueyi
AU - Huang, Shaozhuan
AU - Xi, Lixia
AU - Liu, Lixang
AU - Liu, Bo
AU - Weng, Qunhong
AU - Zhang, Lin
AU - Schmidt, Oliver G.
N1 - Funding information: This work was financially supported by the German Science Foundation (DFG) under the program “Temporary Position for Principal Investigator”.
PY - 2017
Y1 - 2017
N2 - Germanium is a promising anode material for lithium ion batteries because of its high theoretical specific capacity and low operation voltage. However, a significant challenge in using Ge-based anodes is the large volume variation during cycling that causes pulverization and capacity fade. Despite intense studies in the past decade, unsatisfactory cycling stability of the Ge-based electrodes still impedes their widespread applications. In this study, we demonstrate a high-performance electrode through the synergistic combination of a high-capacity Ge film grown on a three-dimensional current collector and an in situ formed poly(vinylidene fluoride)-hexafluoropropene/SiO 2 protective layer. Specifically, the polymer matrix is in continuous contact with the surface of the Ge shell, which provides improved mechanical and ionic transport properties. As a highlight, we present impressive cycling stability over 3000 cycles at 1 C rate with a capacity retention as high as 95.7%. Furthermore, the LiCoO 2-Ge full battery operates at an average voltage of 3.3 V at 0.5 C and maintains good electrochemical performance, suggesting great potential for applications in energy storage and conversion devices.
AB - Germanium is a promising anode material for lithium ion batteries because of its high theoretical specific capacity and low operation voltage. However, a significant challenge in using Ge-based anodes is the large volume variation during cycling that causes pulverization and capacity fade. Despite intense studies in the past decade, unsatisfactory cycling stability of the Ge-based electrodes still impedes their widespread applications. In this study, we demonstrate a high-performance electrode through the synergistic combination of a high-capacity Ge film grown on a three-dimensional current collector and an in situ formed poly(vinylidene fluoride)-hexafluoropropene/SiO 2 protective layer. Specifically, the polymer matrix is in continuous contact with the surface of the Ge shell, which provides improved mechanical and ionic transport properties. As a highlight, we present impressive cycling stability over 3000 cycles at 1 C rate with a capacity retention as high as 95.7%. Furthermore, the LiCoO 2-Ge full battery operates at an average voltage of 3.3 V at 0.5 C and maintains good electrochemical performance, suggesting great potential for applications in energy storage and conversion devices.
KW - amorphous Ge anode
KW - full cell
KW - high electrochemical performance
KW - lithium storage
KW - PVDF-HFP/SiO functional coating
UR - http://www.scopus.com/inward/record.url?scp=85033446586&partnerID=8YFLogxK
U2 - 10.1021/acsami.7b12228
DO - 10.1021/acsami.7b12228
M3 - Article
VL - 9
SP - 38556
EP - 38566
JO - ACS Applied Materials & Interfaces
JF - ACS Applied Materials & Interfaces
SN - 1944-8244
IS - 44
ER -