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

DOI: 10.1002/advs.202205084

Authors: Haobo Dong (University College London) , Ruirui Liu (Laboratory of Salt Lake Resources Chemistry of Qinghai Province, Chinese Academy of Sciences) , Xueying Hu (University College London) , Fangjia Zhao (University College London) , Liqun Kang (University College London) , Longxiang Liu (University College London) , Jianwei Li (University College London) , Yeshu Tan (University College London) , Yongquan Zhou (Laboratory of Salt Lake Resources Chemistry of Qinghai Province, Chinese Academy of Sciences) , Dan J. L. Brett (University College London) , Guanjie He (University College London) , Ivan Parkin (University College London)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Advanced Science , VOL 334

State: Published (Approved)
Published: December 2022
Diamond Proposal Number(s): 30614 , 29809

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.

Journal Keywords: in situ formation; interface engineering; water-soluble binder; zinc-ion batteries

Diamond Keywords: Batteries; Zinc-ion

Subject Areas: Materials, Chemistry, Energy

Diamond Offline Facilities: Electron Physical Sciences Imaging Centre (ePSIC)
Instruments: E02-JEM ARM 300CF

Added On: 18/12/2022 22:05

Documents:
Advanced Science - 2022 - Dong - Cathode Electrolyte Interface Modification by Binder Engineering for High%E2%80%90Performance.pdf

Discipline Tags:

Energy Storage Energy Physical Chemistry Energy Materials Chemistry Materials Science Chemical Engineering Engineering & Technology

Technical Tags:

Microscopy Electron Microscopy (EM) Scanning Electron Microscopy (SEM) Transmission Electron Microscopy (TEM)