Poly(acrylic acid) locally enriched in slurry enhances the electrochemical performance of the SiOx lithium-ion battery anode

被引:9
|
作者
Yang, Ming [1 ,2 ]
Chen, Peng [3 ]
Li, Jiapei [2 ,4 ]
Qi, Ruoxuan [2 ,5 ]
Huang, Yudai [4 ]
Mueller-Buschbaum, Peter [5 ,6 ]
Cheng, Ya-Jun [2 ]
Guo, Kunkun [3 ]
Xia, Yonggao [2 ,7 ]
机构
[1] Univ Sci & Technol China, Nano Sci & Technol Inst, 166 Renai Rd, Suzhou 215123, Jiangsu, Peoples R China
[2] Chinese Acad Sci, Ningbo Inst Mat Technol & Engn, 1219 Zhongguan West Rd, Ningbo 315201, Zhejiang, Peoples R China
[3] Hunan Univ, Coll Mat Sci & Engn, Changsha 410028, Hunan, Peoples R China
[4] Xinjiang Univ, Coll Chem, State Key Lab Chem & Utilizat Carbon Based Energy, Urumqi 830017, Xinjiang, Peoples R China
[5] Tech Univ Munich, Chair Funct Mat, TUM Sch Nat Sci, Dept Phys, James Franck Str 1, D-85748 Garching, Germany
[6] Tech Univ Munich, Heinz Maier Leibnitz Zent MLZ, Lichtenbergstr 1, D-85748 Garching, Germany
[7] Univ Chinese Acad Sci, Ctr Mat Sci & Optoelect Engn, 19A Yuquan Rd, Beijing 100049, Peoples R China
基金
中国国家自然科学基金;
关键词
SOLID-ELECTROLYTE INTERPHASE; SILICON ANODES; BINDER;
D O I
10.1039/d2ta09840g
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Silicon oxide (SiOx) is recognized as a promising anode material for high-energy lithium-ion batteries (LIBs) due to its abundant reserves, facile synthesis, and high theoretical capacity. However, the practical use of the SiOx anode is severely hampered due to its poor cycling stability caused by a large volume change upon lithiation/delithiation. The waterborne poly(acrylic acid) (PAA) binder has been regarded as one of the most promising binders for SiOx-based anodes. In this work, a new concept is developed using locally an enriched PAA binder to enhance the structural stability of the electrode, the adhesion force between the electrode and the current collector, and the dispersion of carbon black within the electrode. By simply replacing water with an organic solvent (for example, N,N '-dimethyl formamide, DMF), the PAA binder is enriched locally in DMF because the PAA chains collapse in the DMF solution, leading to an increased functional group density. Improved electrochemical performance in terms of capacity retention and rate capacity is achieved by the locally enriched PAA binder in both half-cell and full-cell configurations. In detail, the SiOx/PAA-DMF||Li half-cell exhibits a high reversible capacity with enhanced long-term cycling stability (1447 mA h g(-1) at 0.5 C for over 100 cycles with 84.5% capacity retention). The LiFePO4||SiOx full-cell test shows that the capacity retention is increased from 62.4% to 74.4% after 200 cycles at 0.5 C. This work establishes a new concept practically feasible for applications of the alloying-based lithium-ion battery anode.
引用
收藏
页码:6205 / 6216
页数:12
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