Hybrid humics/sodium carboxymethyl cellulose water-soluble binder for enhancing the electrochemical performance of a Li-ion battery cathode
Hybrid humics/sodium carboxymethyl cellulose water-soluble binder for enhancing the electrochemical performance of a Li-ion battery cathode
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用于增强锂离子电池正极电化学性能的混合腐殖质/羧甲基纤维素钠水溶性粘合剂
DOI：
10.1016/j.powtec.2019.04.027
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发表时间：
2019-06
期刊：
影响因子：
--
通讯作者：
Liu Jiongtian
中科院分区：
文献类型：
--
作者：
Yang Shuzhen;Huang Yanfang;Su Shengpeng;Han Guihong;Liu Jiongtian
研究了一种水溶性腐殖酸基复合粘结剂（腐殖酸/羧甲基纤维素钠（CMC））对锂离子电池正极（LiFePO 4）电化学性能的增强作用。采用分子动力学模拟方法研究了粘结剂活性组分与相关材料（LiFePO 4和Al）的粘结机理.腐殖酸用于连接活性材料并在阴极中提供导电桥。为了改善颗粒与集流体之间的粘附性，CMC作为辅助级分以腐殖酸与CMC的质量比为3：1添加。扫描电子显微镜的结果表明，与混合腐殖酸/CMC粘合剂的电极的形态是更均匀的比与传统的聚偏氟乙烯和CMC粘合剂的电极。正极材料的电化学性能和循环稳定性明显提高。在0.5 °C下循环100次后，其可逆比容量可达152.3 mAh g− 1。倍率性能大大提高，8 °C时的比容量高达105 mAh g− 1。腐殖酸/CMC复合材料可作为一种新型、环保、高效的锂离子电池粘结剂。
A hybrid water-soluble humics-based binder (humics/sodium carboxymethyl cellulose (CMC)) was studied to enhance the electrochemical performance of a Li-ion battery cathode (LiFePO4) in this work. Molecular dynamics simulations of binder active fractions with related materials (LiFePO4and Al) were performed to explore the binding mechanisms. Humics serve to connect the active material and provide a conducting bridge in the cathode. To improve the adhesion between the particles and current collector, CMC is added as an auxiliary fraction with a mass ratio of humics to CMC of 3:1. The scanning electron microscope results indicate that the morphology of the electrode with the hybrid humics/CMC binder is more uniform than that of electrodes with conventional polyvinylidene fluoride and CMC binders. The electrochemical performance and cycling stability of the cathode materials are obviously enhanced. The reversible specific capacity can reach 152.3 mAh g−1at 0.5 °C after 100 cycles. The rate capability is greatly improved, with a specific capacity as high as 105 mAh g−1at 8 °C. The humics/CMC composite can be regarded as a novel, environmentally friendly and high-efficiency binder for application in Li-ion batteries.
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