期刊
JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 625, 期 -, 页码 373-382出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2022.06.002
关键词
Si-based anode; Self-healing; Supramolecular; Cycle stability; Lithium-ion battery
资金
- National Natural Science Foun-dation of China [21805304, 51572031and 52006056]
- Zhuhai Science and Technology Department Project [ZH22017003200028PWC, ZH22017001200078PWC]
- Zhuhai Innovation and Entrepreneurship Team Project [ZH22055905200017PWC]
In this study, a three-dimensional self-healing binder (PVA + LB) composed of polyvinyl alcohol and lithium metaborate solution is proposed to improve the cycle stability of Si-based lithium-ion batteries. The use of PVA + LB as a binder results in maintained reversible capacity and excellent electrochemical performance of silicon electrodes.
Capacity retention is one of the key factors affecting the performance of silicon (Si)-based lithium-ion batteries and other energy storage devices. Herein, a three dimension (3D) network self-healing binder (denoted as PVA + LB) consisting of polyvinyl alcohol (PVA) and lithium metaborate (LiBO2) solution is proposed to improve the cycle stability of Si-based lithium-ion batteries. The reversible capacity of the silicon electrode is maintained at 1767.3 mAh g(-1) after 180 cycles when employing PVA + LB as the bin-der, exhibiting excellent cycling stability. In addition, the silicon/carbon (Si/C) anode with the PVA + LB binder presents superior electrochemical performance, achieving a stable cycle life with a capacity reten-tion of 73.7% (858.3 mAh g(-1)) after 800 cycles at a current density of 1 A g(-1). The high viscosity and flex-ibility, 3D network structure, and self-healing characteristics of the PVA + LB binder are the main reasons to improve the stability of the Si or Si/C contained electrodes. The novel self-healing binder shows great potential in designing the new generation of silicon-based lithium-ion batteries and even electrochemical energy storage devices.(C) 2022 Elsevier Inc. All rights reserved.
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