材料科学
电极
复合材料
电池(电)
电解质
石英晶体微天平
粒子(生态学)
粘弹性
插层(化学)
复合数
地质学
物理化学
吸附
物理
功率(物理)
有机化学
无机化学
化学
海洋学
量子力学
作者
Netanel Shpigel,Sergey Sigalov,Mikhael D. Levi,Tyler S. Mathis,Leonid Daikhin,Alar Jänes,Enn Lust,Yury Gogotsi,Doron Aurbach
出处
期刊:Joule
[Elsevier]
日期:2018-05-16
卷期号:2 (5): 988-1003
被引量:25
标识
DOI:10.1016/j.joule.2018.02.014
摘要
Summary The high phase-transformation strain developed upon intercalation in the host particles of a composite battery electrode affects the polymeric binder network mechanically, deteriorating the electrode cycling performance. Here, electrochemical quartz crystal microbalance with dissipation monitoring (EQCM-D) is used to demonstrate a new strain-accommodation mechanism, in high-strain NaFePO 4 /PVdF electrodes, via relaxation of the binder network surrounding the intercalation particles. Complete mechanical degradation of the polymer network occurs during long-term cycling of NaFePO 4 electrodes in aqueous solutions (hard and tough behavior). In contrast, in aprotic solutions, a softened binder easily accommodates the high transformation strain, ensuring excellent electrode cycling performance (soft and tough behavior). Quantification of the high-frequency viscoelastic properties of an operating composite electrode linked to the binder's fracture toughness ensures fast and facile screening of the optimal polymeric binder/electrolyte solution combinations. This methodology should be extremely important for optimization of cycling performance of Li-Si anodes undergoing huge volume changes during cycling.
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