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Influence of Carbonate Electrolyte Solvents on Voltage and Capacity Degradation in Li-Rich Cathodes for Li-ion Batteries

Published version
Peer-reviewed

Repository DOI


Change log

Authors

Weng, B 
Mahadevegowda, A 
Temprano, I 
Wang, H 

Abstract

jats:titleAbstract</jats:title>jats:pLithium‐rich cobalt‐free cathodes, such as Lijats:sub1.2</jats:sub>Mnjats:sub0.6</jats:sub>Nijats:sub0.2</jats:sub>Ojats:sub2</jats:sub> (LMR), are promising next‐generation cathode materials because of their high energy density, cost efficiency, and sustainability. Nevertheless, LMRs suffer from degradation problems such as voltage decay during cycling. Different LMR surface doping and coating strategies are proposed to suppress LMR voltage decay with varying extents of success. Here, the role played by different electrolyte solvents in oxygen loss from the LMR surface is instead investigated. X‐ray absorption spectroscopy (XAS), electron energy loss spectroscopy (EELS), synchrotron XRD, and online electrochemical mass spectrometry (OEMS) results show that ethylene carbonate (EC) leads to accelerated oxygen loss from the LMR surface. As a result, cycling LMR cathodes in EC‐free electrolytes such as pure EMC, improves the capacity retention and reduces voltage decay. This approach provides a new strategy to increase the cycling stability of LMR cathodes, which is important for the development of more sustainable high‐performance batteries.</jats:p>

Description

Publication status: Published

Keywords

40 Engineering, 4016 Materials Engineering, 34 Chemical Sciences, 3406 Physical Chemistry, 7 Affordable and Clean Energy

Journal Title

Advanced Energy Materials

Conference Name

Journal ISSN

1614-6832
1614-6840

Volume Title

Publisher

Wiley
Sponsorship
European Commission Horizon 2020 (H2020) ERC (866005)