A novel zwitterionic polymer binder with enhanced ionic conductivity for water-processable LiFePO4 cathodes. (7th June 2021)

• Record Type: Journal Article
• Authors: Huang, Shu; Huang, Xiaoting; Li, Xiaokai; Huang, Youyuan; He, Xueqin; Zhuo, Haitao; Chen, Shaojun
• Is Part Of: New journal of chemistry. Volume 45:Number 25(2021)
• Page Start: 11130
• Page End: 11135
• Publication Date: 2021-06-07
• Subjects: Chemistry -- Periodicals; Chimie -- Périodiques; 540
• DOI: 10.1039/d1nj01401c
• Languages: English
• ISSNs: 1144-0546

Abstract

Abstract : The structure of rich Li + and zwitterions in LZI chains benefits the Li + transport at the interfaces between the LZI and cathodes. Abstract : Current olivine structure LiFePO4 possesses poor conductivity, which makes it unsuitable for unparalleled battery applications. This issue can be solved by improved design concepts of binder systems. Herein, an original waterborne binder polymer with efficient functional groups is designed and fabricated for LiFePO4 cathodes of lithium-ion batteries (LIBs). Compared to universal lithiated ionomer binders, the introduction of the zwitterionic structure of the ionomer enhances the ionic conductivity by nearly 100-fold. LiFePO4 cathodes assembled with limited 1.5 wt% lithiated zwitterionic ionomer (LZI) maintain markedly stable cycling performances with 95.62% retention at 1C after 250 cycles. Also, LZI-cathodes preserve good integrity structures after cycling, as confirmed by morphology analysis. In sum, LZI-cathodes look promising for potential applications in LIBs due to their numerous advantageous characteristics.