期刊
CARBOHYDRATE POLYMERS
卷 112, 期 -, 页码 532-538出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2014.06.034
关键词
Lithium battery; Lithium iron phosphate; Water-based binder; Sodium carboxymethyl cellulose; Lithium carboxymethyl cellulose
资金
- special programs of graduate students' scientific and technological innovation activities of Beijing Institute of Technology [3090012241302]
- Youth Science and Technology Innovation Projects of North Chemical Industry Co., Ltd. [QKCZ-BIT-04]
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 hg(-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. (C) 2014 Elsevier Ltd. All rights reserved.
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