title: Novel polymer Li-ion binder carboxymethyl cellulose derivative enhanced electrochemical performance for Li-ion batteries.
abstract: Novel water-based binder lithium carboxymethyl cellulose (CMC-Li) is synthesized by cotton as raw material. The mechanism of the CMC-Li as a binder is reported. Electrochemical properties of batteries' cathodes based on commercially available lithium iron phosphate (LiFePO4, LFP) and water-soluble binder are investigated. Sodium carboxymethyl cellulose (CMC-Na, CMC) and CMC-Li are used as the binder. After 200 cycles, compared with conventional poly(vinylidene fluoride) (PVDF) binder, the CMC-Li binder significantly improves cycling performance of the LFP cathode 96.7% of initial reversible capacity achieved at 175 mA h g(-1). Constant current charge-discharge test results demonstrate that the LFP electrode using CMC-Li as the binder has the highest rate capability, followed closely by those using CMC and PVDF binders, respectively. Electrochemical impedance spectroscopy test results show that the electrode using CMC-Li as the binder has lower charge transfer resistance than the electrodes using CMC and PVDF as the binders.
authors.affiliation: College of Material Science and Engineering, Beijing Institute of Technology, Beijing Engineering Technology Research Centre for Cellulose and Its Derivative Materials, Beijing 100081, PR China. Electronic address: qiulei1010@126.com.
authors.forename: Lei
authors.initials: L
authors.lastname: Qiu
authors.affiliation: College of Material Science and Engineering, Beijing Institute of Technology, Beijing Engineering Technology Research Centre for Cellulose and Its Derivative Materials, Beijing 100081, PR China. Electronic address: shaoziqiang409@163.com.
authors.forename: Ziqiang
authors.initials: Z
authors.lastname: Shao
authors.affiliation: College of Material Science and Engineering, Beijing Institute of Technology, Beijing Engineering Technology Research Centre for Cellulose and Its Derivative Materials, Beijing 100081, PR China.
authors.forename: Daxiong
authors.initials: D
authors.lastname: Wang
authors.affiliation: College of Material Science and Engineering, Beijing Institute of Technology, Beijing Engineering Technology Research Centre for Cellulose and Its Derivative Materials, Beijing 100081, PR China.
authors.forename: Feijun
authors.initials: F
authors.lastname: Wang
authors.affiliation: College of Material Science and Engineering, Beijing Institute of Technology, Beijing Engineering Technology Research Centre for Cellulose and Its Derivative Materials, Beijing 100081, PR China.
authors.forename: Wenjun
authors.initials: W
authors.lastname: Wang
authors.affiliation: College of Material Science and Engineering, Beijing Institute of Technology, Beijing Engineering Technology Research Centre for Cellulose and Its Derivative Materials, Beijing 100081, PR China.
authors.forename: Jianquan
authors.initials: J
authors.lastname: Wang
keywords: Lithium battery; Lithium carboxymethyl cellulose; Lithium iron phosphate; Sodium carboxymethyl cellulose; Water-based binder