Application of different aqueous binders in LiFePO4 electrode

doi:10.12028/j.issn.2095-4239.2016.0027

Abstract

Abstract: Binder is indispensable and also has a direct impact on the performance of lithium-ion batteries. The introduction of aqueous binders into the manufacturing process of lithium-ion batteries can be more environmentally friendly, and meanwhile decrease the manufacturing cost and bring great economic benefit by its development and application. In this work two kind of polyacrylate binders LA and LB were used in LiFePO4 electrodes and the electrochemical performance of the prepared electrodes were investigated. Electrochemical test showed that the oxidation potential of the polyacrylate binder was about 4.65 V. Due to its higher oxidation potential, the polyacrylate binder is more suitable for the cathode of lithium-ion batteries. In comparison with LA, the LB binder showed better thermal stability with a decompose temperature of 318 ℃. Lithium ion diffusion coefficients for LA and LB electrodes were 6.2×1014 cm2/s and 1.8×1014 cm2/s, respectively. The effect of LA and LB binders on the electrode manufacturing properties, the battery capacity, rate performance, and cycle life were detailedly investigated and the optimized strategy for the application of aqueous binders in the LiFePO4 based electrodes were obtained. The results indicated that 3% of the LA binder content, 2.5% of the LB binder content, and 2.25 g/cm3 of the compaction density are the optimized condition for the batteries to obtain a best cycle life and overall performance.

Key words: LiFePO4, aqueous binders, lithium-ion batteries

LI Shanhe1,2, LIAO Xiaozhen1, ZHAO Zhengwei2, LU Cheng2, YE Mao2, HE Long3, LUO Hongbin3, MA Zifeng1,2. Application of different aqueous binders in LiFePO4 electrode[J]. Energy Storage Science and Technology, 2017, 6(1): 116-121.

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