材料科学
电极
电化学
硅
羧酸盐
化学工程
傅里叶变换红外光谱
涂层
碳酸丙烯酯
复合材料
无机化学
有机化学
冶金
物理化学
化学
工程类
作者
Lucas Huet,Driss Mazouzi,Philippe Moreau,Nicolas Dupré,Michaël Paris,Sébastien Mittelette,Danielle Laurencin,Thomas Devic,Lionel Roué,Bernard Lestriez
标识
DOI:10.1021/acsami.3c00186
摘要
A simple and versatile preparation of Zn(II)-poly(carboxylates) reticulated binders by the addition of Zn(II) precursors (ZnSO4, ZnO, or Zn(NO3)2) into a preoptimized poly(carboxylic acids) binder solution is proposed. These binders lead systematically to a significantly improved electrochemical performance when used for the formulation of silicon-based negative electrodes. The formation of carboxylate-Zn(II) coordination bonds formation is investigated by rheology and FTIR and NMR spectroscopies. Mechanical characterizations reveal that the coordinated binder offers a better electrode coating cohesion and adhesion to the current collector, as well as higher hardness and elastic modulus, which are even preserved in the presence of a carbonate solvent (i.e., in battery operation conditions). Ultimately, as shown from operando dilatometry experiments, the electrode expansion during lithiation is reduced, mitigating electrode mechanical failure. Such coordinatively reticulated electrodes outperform their uncoordinated counterparts with an improved capacity retention of over 30% after 60 cycles.
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