Vulcanized polyisoprene-graft-maleic anhydride as an efficient binder for silicon anodes in lithium-ion batteries. (1st July 2022)

• Record Type: Journal Article
• Authors: Bolloju, Satish; Chang, Yu-Lung; Sharma, Santosh U.; Hsu, Ming-Feng; Lee, Jyh-Tsung
• Is Part Of: Electrochimica acta. Volume 419(2022)
• Publication Date: 2022-07-01
• Subjects: Silicon anode -- Sulfur -- Vulcanization -- Binder -- Rubber -- Lithium-ion batteries; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2022.140390
• Languages: English
• ISSNs: 0013-4686

Abstract

Highlights: VPI- g -MA is utilized as an in situ cross-linked binder for Si electrodes. The VPI- g -MA binder is an elastic polymer. The Si electrode with the VPI -g- MA binder exhibits the high charge capacity of 4005 mAh g −1 . VPI -g- MA binder could enhance the cycle-life performance of Si electrodes. Abstract: Vulcanized polyisoprene- graft -maleic anhydride (VPI- g -MA) has been utilized as an in situ cross-linked binder for silicon (Si) anodes. PI- g -MA was vulcanized with sulfur at 180 °C to form an elastic polymer with a glass transition temperature of −45.5 °C measured via differential scanning calorimetry. The results of infrared spectroscopy confirm the formation of C-S bonds. The Si anode with the VPI- g -MA binder exhibited a high initial charge capacity of 4005 mAh g −1 at a charge/discharge rate of 0.1 C and demonstrated significant cycle-life performance of up to 200 cycles at a C-rate of 0.5 C. Furthermore, the peeling test results showed that the Si electrode with the VPI- g -MA binder has better adhesion strength than the Si electrode with either PVDF, PI -g- MA, or SBR/CMC binder. Scanning electron microscopy images showed that the VPI- g -MA binder could effectively maintain the integrity of the Si electrode throughout the cycling process. Thus, the VPI- g -MA binder can enhance the cycle-life performance of Si anodes. Graphical abstract: Image, graphical abstract .