Title

Unravelling binder chemistry in sodium/potassium ion batteries for superior electrochemical performances

Publication Name

Journal of Materials Chemistry A

Abstract

The binder chemistry in Na/K ion batteries is important to electrochemical performance. Here, commercial TiO2 nanoparticles are employed as a model to illustrate the binder chemistry in ethers, with polyvinylidene difluoride (PVdF) and sodium carboxymethyl cellulose (CMC) as the examples. An electrode using CMC as the binder shows superior electrochemical performance to that using PVdF, especially in terms of initial coulombic efficiency (80.1% for CMC vs. 52.5% for PVdF). The worse performance of the electrode using PVdF is mainly due to electrochemical defluorination of PVdF, which leads to cleavage of C-F and the formation of NaF over the electrode. Last but not least, a similar improvement in the binder chemistry works for many anode materials in Na/K-ion batteries. This journal is

Open Access Status

This publication is not available as open access

Volume

10

Issue

8

First Page

4060

Last Page

4067

Funding Number

ts201511004

Funding Sponsor

National Natural Science Foundation of China

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Link to publisher version (DOI)

http://dx.doi.org/10.1039/d1ta09516a