Huang Shu, Huang Xiaoting, Huang Youyuan, He Xueqin, Zhuo Haitao, Chen Shaojun
College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen 518060, China.
College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China.
Polymers (Basel). 2021 Sep 17;13(18):3146. doi: 10.3390/polym13183146.
Polymer binders are critical auxiliary additives to Li-ion batteries that provide adhesion and cohesion for electrodes to maintain conductive networks upon charge/discharge processes. Therefore, polymer binders become interconnected electrode structures affecting electrochemical performances, especially in LiFePO cathodes with one-dimensional Li channels. In this paper, recent improvements in the polymer binders used in the LiFePO cathodes of Li-ion batteries are reviewed in terms of structural design, synthetic methods, and working mechanisms. The polymer binders were classified into three types depending on their effects on the performances of LiFePO cathodes. The first consisted of PVDF and related composites, and the second relied on waterborne and conductive binders. Profound insights into the ability of binder structures to enhance cathode performance were discovered. Overcoming the bottleneck shortage originating from olivine structure LiFePO using efficient polymer structures is discussed. We forecast design principles for the polymer binders used in the high-performance LiFePO cathodes of Li-ion batteries. Finally, perspectives on the application of future binder designs for electrodes with poor conductivity are presented to provide possible design directions for chemical structures.
聚合物粘结剂是锂离子电池的关键辅助添加剂，可在充电/放电过程中为电极提供附着力和内聚力，以维持导电网络。因此，聚合物粘结剂成为影响电化学性能的相互连接的电极结构，尤其是在具有一维锂通道的磷酸铁锂阴极中。本文从结构设计、合成方法和作用机制等方面综述了锂离子电池磷酸铁锂阴极中聚合物粘结剂的最新进展。根据聚合物粘结剂对磷酸铁锂阴极性能的影响，将其分为三类。第一类由聚偏氟乙烯及其相关复合材料组成，第二类依赖于水性和导电粘结剂。深入了解了粘结剂结构增强阴极性能的能力。讨论了使用高效聚合物结构克服橄榄石结构磷酸铁锂产生的瓶颈短缺问题。我们预测了锂离子电池高性能磷酸铁锂阴极中聚合物粘结剂的设计原则。最后，对未来用于低导电性电极的粘结剂设计应用提出了展望，为化学结构提供可能的设计方向。
