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Cathode‐Electrolyte‐Interphase Film Formation on a LiNiO2 Surface in Conventional Aqueous Electrolytes: Simple Method to Improve the Electrochemical Performance of LiNiO2 Electrodes for Use in Aqueous Li‐Ion Batteries

Cathode‐Electrolyte‐Interphase Film Formation on a LiNiO2 Surface in Conventional Aqueous... Passivation films, the so‐called solid–electrolyte interphase and cathode–electrolyte interphase (CEI), are considered to be essential for the operation of rechargeable batteries because they have a positive impact on electrochemical performance including cyclability. In the field of aqueous Li‐ion batteries (ALIBs) to date, it is generally accepted that these films can only be formed in super‐concentrated electrolytes containing fluorine‐based organic anions such as N(SO2CF3)2 and SO3CF3. This study demonstrates for the first time that a CEI film can be created on a LiNiO2 (LNO) electrode in conventional aqueous electrolytes and improve electrochemical performance such as reversible capacities and cyclability. The results reveal that a CEI film, mainly composed of Li2CO3 and LiOH, is formed on the LNO surface in a saturated LiNO3 aqueous electrolyte containing LiOH beginning at the first de‐intercalation of Li+ ions, suppressing side reactions between the surface and aqueous electrolyte, and improving the recovery rate of structural changes of LNO during the charge/discharge process. As a result, this study suggests that LNO has great potential for application as a cathode material for high energy density ALIBs. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Advanced Energy Materials Wiley

Cathode‐Electrolyte‐Interphase Film Formation on a LiNiO2 Surface in Conventional Aqueous Electrolytes: Simple Method to Improve the Electrochemical Performance of LiNiO2 Electrodes for Use in Aqueous Li‐Ion Batteries

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References (60)

Publisher
Wiley
Copyright
© 2021 Wiley‐VCH GmbH
ISSN
1614-6832
eISSN
1614-6840
DOI
10.1002/aenm.202100756
Publisher site
See Article on Publisher Site

Abstract

Passivation films, the so‐called solid–electrolyte interphase and cathode–electrolyte interphase (CEI), are considered to be essential for the operation of rechargeable batteries because they have a positive impact on electrochemical performance including cyclability. In the field of aqueous Li‐ion batteries (ALIBs) to date, it is generally accepted that these films can only be formed in super‐concentrated electrolytes containing fluorine‐based organic anions such as N(SO2CF3)2 and SO3CF3. This study demonstrates for the first time that a CEI film can be created on a LiNiO2 (LNO) electrode in conventional aqueous electrolytes and improve electrochemical performance such as reversible capacities and cyclability. The results reveal that a CEI film, mainly composed of Li2CO3 and LiOH, is formed on the LNO surface in a saturated LiNO3 aqueous electrolyte containing LiOH beginning at the first de‐intercalation of Li+ ions, suppressing side reactions between the surface and aqueous electrolyte, and improving the recovery rate of structural changes of LNO during the charge/discharge process. As a result, this study suggests that LNO has great potential for application as a cathode material for high energy density ALIBs.

Journal

Advanced Energy MaterialsWiley

Published: Jul 1, 2021

Keywords: ; ; ; ;

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