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.
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.
Carbohydr Polym. 2014 Nov 4;112:532-8. doi: 10.1016/j.carbpol.2014.06.034. Epub 2014 Jun 20.
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.
新型水基粘结剂羧甲基纤维素锂（CMC-Li）是由棉花为原料合成的。报告了 CMC-Li 作为粘结剂的作用机制。研究了基于市售磷酸铁锂（LiFePO4，LFP）和水溶性粘结剂的电池正极的电化学性能。使用羧甲基纤维素钠（CMC-Na，CMC）和 CMC-Li 作为粘结剂。经过 200 次循环后，与传统的聚偏二氟乙烯（PVDF）粘结剂相比，CMC-Li 粘结剂使 LFP 正极的循环性能显著提高，在 175 mA h g(-1)时可达到初始可逆容量的 96.7%。恒流充放电测试结果表明，以 CMC-Li 作为粘结剂的 LFP 电极具有最高的倍率性能，其次是分别使用 CMC 和 PVDF 作为粘结剂的电极。电化学阻抗谱测试结果表明，以 CMC-Li 作为粘结剂的电极的电荷转移电阻低于以 CMC 和 PVDF 作为粘结剂的电极。
