基于聚氨酯的新型锂离子电池柔性正极

Polyurethane-Based Flexible Cathode for Lithium Ion Battery

选用苝二酰亚胺作为活性材料,炭黑作为导电剂,热塑性聚氨酯(TPU)作为柔性基底,先采用酸溶液加工方法制备酸溶苝二酰亚胺/炭黑复合物,再使用相转换方法制备TPU/炭黑/苝二酰亚胺的锂离子电池复合柔性正极材料。通过一系列对比试验,相比于直接混合法,酸溶液加工法制备的复合柔性正极材料具有更加优异的电化学性能,在0.05A/g时,比容量高达130mAh/g,在0.5A/g循环300圈后容量保留率为91%。将其应用到柔性锂离子电池中时,在弯曲状态时仍然展现出了稳定的电化学性能,表明基于溶液加工方法制备的聚氨酯基底的柔性正极材料具有广阔的应用前景。

Taking Perylene tetracarboxylic diimide(PDI)as active material,carbon black(CB)as conductive agent and thermoplastic polyurethane(TPU)as flexible base,CB/PDI-A compound was prepared by dissolved in acid solution.Then the flexible anode materials of TPU/CB/PDI-A were prepared by phase conversion method.By comparison,the flexible anode materials prepared by the acid-solution method shows better electrochemical performance than direct mixing method.When the current density is 0.05 A/g,the specific capacity could achieve 130 mAh/g.At the current density of 0.5 A/g,the capacity retention could achieve 91%even after 300 charge/discharge cycles.Finally,the TPU/CB/PDI-Acathode obtained by the acid-solution method is coupled with a pre-lithiated carbon cloth anode to fabricate a flexible lithium ion battery.This flexible lithium ion battery could still maintain good galvanostatic charge-discharge performance under bending state,which suggests the potential application value of TPU as the flexible substrate in flexible lithium ion battery.