paa是什么材料 paa是什么材料能生产塑料颗粒吗( 三 ) _百科达人

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锂电池新型粘结剂最新研究汇总3本文综述了不同类型锂离子电池用新型粘结剂的研究进展，分析了其各自的特征和优缺点，并预测了新型粘结剂未来的发展方向。
一、导读
粘结剂是锂离子电池极片重要的组成材料之一，是将电极片中活性物质和导电剂粘附在电极集流体上的高分子化合物，具有增强活性材料、导电剂和集流体间接触性以及稳定极片结构的作用，是锂离子电池材料中技术含量较高的附加材料。研究表明，虽然粘结剂在电极片中用量较少，但粘结剂性能的优劣直接影响电池的容量、寿命及安全性。
最早被商业化的锂离子电池用粘结剂是聚偏氟乙烯（PVDF）。然而，这种粘结剂存在以下缺点：
A: 电子和离子电导性差；
B: 易被电解液溶胀，导致活性物质在集流体上附着性变差；
C: 机械性能与弹性不理想；
D: 容易和金属锂形成碳化锂，影响电池的使用寿命和安全性能；
E: 储存及使用时对环境的湿度要求高。
随着锂离子电池产业的不断发展，对粘结剂的性能要求也在不断提高。新型结构的锂离子电池需要粘结剂具有优异的力学性能。动力型锂离子电池由于其放电功率大，需要粘结剂在具有良好粘结性的同时还应具有较好的电子和离子电导性。高能量密度型锂离子电池会使用高比容量的正负极活性物质，而这些材料在脱嵌锂的过程中体积变化大，为了维持电极结构的稳定性，则需要粘结剂具有良好的弹性来缓冲上述体积效应。