Coil‐to‐stretch transition of binder chains enabled by “Nano‐Combs” to facilitate highly stable SiOx anode
File(s)
Accepted version
Author(s)
Type
Journal Article
Abstract
The commercialized binder carboxymethyl cellulose sodium (CMC-Na) is considered unsuitable for micro-sized SiOx anode as it cannot endure the large volume change to retain the conductive network during repeated charge/discharge cycles. Herein, a small amount of silicon nano particles (SiNPs) is added during slurry preparation process as “nano-combs” to unfold the convoluted CMC-Na polymer chains so that they undergo a coil-to-stretch transition by interaction between polar groups (e.g -OH, -COONa) of polymer and SiNPs’ large surface. Through maximizing the utilization of binders, a uniform conductive network is constructed with increased interfacial contact with micro-sized SiOx. As a result, the SiOx electrode with optimized (10 wt%) SiNPs addition shows significantly improved initial capacity as well as cycling performance. Through revisiting CMC-Na, a currently deemed unqualified binder in SiOx anode, this work gives a brand-new perspective on the failing mechanism of Si-based anode materials as well as an improving strategy for electrode preparation.
Date Issued
2022-10-01
Date Acceptance
2021-07-01
Citation
Energy & Environmental Materials, 2022, 5 (4), pp.1310-1316
ISSN
2575-0356
Publisher
Wiley
Start Page
1310
End Page
1316
Journal / Book Title
Energy & Environmental Materials
Volume
5
Issue
4
Copyright Statement
Copyright reserved
Identifier
https://onlinelibrary.wiley.com/doi/10.1002/eem2.12248
Subjects
Science & Technology
Technology
Materials Science, Multidisciplinary
Materials Science
binding network
CMC-Na
lithium-ion batteries
Si anode
SiOx anode
CARBOXYMETHYL CELLULOSE
SILICON ANODES
NEGATIVE ELECTRODES
ION
PERFORMANCE
CMC
Publication Status
Published
Article Number
eem2.12248
Date Publish Online
2021-07-20