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E02-JEM ARM 300CF	Cathode–electrolyte interface modification by binder engineering for high-performance aqueous zinc-ion batteries Haobo Dong , Ruirui Liu , Xueying Hu , Fangjia Zhao , Liqun Kang , Longxiang Liu , Jianwei Li , Yeshu Tan , Yongquan Zhou , Dan J. L. Brett , Guanjie He , Ivan Parkin Advanced Science 334 DOI: 10.1002/advs.202205084 Diamond Proposal Number(s): [30614, 29809] Open Access Show Abstract ▼ Abstract: A stable cathode–electrolyte interface (CEI) is crucial for aqueous zinc-ion batteries (AZIBs), but it is less investigated. Commercial binder poly(vinylidene fluoride) (PVDF) is widely used without scrutinizing its suitability and cathode-electrolyte interface (CEI) in AZIBs. A water-soluble binder is developed that facilitated the in situ formation of a CEI protecting layer tuning the interfacial morphology. By combining a polysaccharide sodium alginate (SA) with a hydrophobic polytetrafluoroethylene (PTFE), the surface morphology, and charge storage kinetics can be confined from diffusion-dominated to capacitance-controlled processes. The underpinning mechanism investigates experimentally in both kinetic and thermodynamic perspectives demonstrate that the COO− from SA acts as an anionic polyelectrolyte facilitating the adsorption of Zn2+; meanwhile fluoride atoms on PTFE backbone provide hydrophobicity to break desolvation penalty. The hybrid binder is beneficial in providing a higher areal flux of Zn2+ at the CEI, where the Zn-Birnessite MnO2 battery with the hybrid binder exhibits an average specific capacity 45.6% higher than that with conventional PVDF binders; moreover, a reduced interface activation energy attained fosters a superior rate capability and a capacity retention of 99.1% in 1000 cycles. The hybrid binder also reduces the cost compared to the PVDF/NMP, which is a universal strategy to modify interface morphology.	Dec 2022

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E02-JEM ARM 300CF

Cathode–electrolyte interface modification by binder engineering for high-performance aqueous zinc-ion batteries