Exploring More Functions in Binders for Lithium Batteries

Lan Zhang; Xiangkun Wu; Weiwei Qian; Kecheng Pan; Xiaoyan Zhang; Liyuan Li; Mengmin Jia; Suojiang Zhang

doi:10.1007/s41918-023-00198-2

Electrochemical Energy Reviews ›› 2023, Vol. 6 ›› Issue (1) DOI: 10.1007/s41918-023-00198-2

Review Article

Exploring More Functions in Binders for Lithium Batteries

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¹CAS Key Laboratory of Green Process and Engineering, Beijing Key Laboratory of Ionic Liquids Clean Process, State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, 100190, Beijing, China

²School of Chemical Engineering, Zhengzhou University, 450001, Zhengzhou, Henan, China

³Longzihu New Energy Laboratory, Zhengzhou Institute of Emerging Industrial Technology, 450000, Zhengzhou, Henan, China

^h sjzhang@ipe.ac.cn

Lan Zhang

is currently an associate Professor of Institute of Process Engineering, CAS. Her research interest focuses on advance electrolytes (including liquid and solid), binders, cathode materials, and electrode structure optimization for lithium batteries.

Xiangkun Wu

is currently an Associate Professor of Electrochemical Engineering at Institute of Process Engineering, CAS. His research interest is structure design and process optimization for lithium-ion batteries.

Weiwei Qian

is currently an Assistant Professor of Institute of Process Engineering, CAS. Her research interest focuses on Li-S batteries and flow batteries.

Suojiang Zhang

is a Member of CAS. He is currently Director-General of the Institute of Process Engineering (IPE), CAS; Dean of College of Chemical Engineering, University of CAS; and Vice-Chairman of the Chemical Industry and Engineering Society of China. He is mainly engaged in the research of green energy, materials, and chemical processes and has breaking through major technological and engineering challenges in molecular conformational design, dynamic regulation of nanoprocesses, process innovation and system integration, and realizing the industrial application of a number of green complete technologies.

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Abstract

As an indispensable part of the lithium-ion battery (LIB), a binder takes a small share of less than 3% (by weight) in the cell; however, it plays multiple roles. The binder is decisive in the slurry rheology, thus influencing the coating process and the resultant porous structures of electrodes. Usually, binders are considered to be inert in conventional LIBs. In the pursuit of higher energy density, many new binders are being developed for specific targets, such as the high-voltage (typically, $\geqslant$ 4.5 V) cathodes, conversion/alloy-type cathodes/anodes with large volume effect, and solid-state batteries (SSBs), in which these binders demonstrate their various functions. They may influence the solid electrolyte interface component, ensure the electrode/electrolyte interfacial stability, transport ions/electrons in the electrodes, provide adhesion and flexibility to solid-state electrolyte (SSE) films, etc. Here in this review, we try to summarize the advances on binders, among which the ones for high-voltage cathode materials, thick electrodes, micro-sized silicon particles, SSEs and SSBs are highlighted. We believe that the advanced functional binders would play decisive roles in the future development of high-energy–density LIBs and SSBs.

Graphical Abstract

Binder usually takes a small part in batteries, while recent studies prove that it has multi-functions more than just adhesive.

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Lan Zhang, Xiangkun Wu, Weiwei Qian, Kecheng Pan, Xiaoyan Zhang, Liyuan Li, Mengmin Jia, Suojiang Zhang. Exploring More Functions in Binders for Lithium Batteries. Electrochemical Energy Reviews, 2023, 6(1): DOI:10.1007/s41918-023-00198-2