Room‐Temperature Crosslinkable Natural Polymer Binder for High‐Rate and Stable Silicon Anodes

By Jaegeon Ryu, Sungho Kim, Jimin Kim, Sooham Park, Seungho Lee, Seok Yoo, Jangbae Kim, N. Choi, Ja-Hyoung Ryu, Soojin Park. Advanced Functional Materials, 2019

136 citations recorded by the source corpus.

Natural polymers with abundant side functionalities are emerging as a promising binder for high‐capacity yet large‐volume‐change silicon anodes with a strong and reversible supramolecular interaction that originates from secondary bonding. However, the supramolecular network solely based on hydrogen bonding is relatively vulnerable to repeated deformation and has an insufficient diffusivity of lithium ions. Herein, reported is a facile but efficient way of incorporating the natural polymers with an ionically conductive crosslinker, which can construct a robust network for silicon anodes. The boronic acid in the crosslinker spontaneously reacts with natural polymers to generate boronic esters at room temperature without any kind of triggers, which gives a strong and dynamic covalent bonding to the supramolecular network. The other component in the crosslinker, polyethylene oxide, contributes to the enhanced ionic conductivity of polymers, leading to outstanding rate performances even at a high mass loading of silicon nanoparticles (>2 mg cm−2). The small portion of the proposed crosslinker can modulate the strength of the entire network by balancing the covalent crosslinking and self‐healing secondary interaction along with the fast lithium‐ion diffusion, thus enabling the extended operation of silicon electrodes.

Subfields: Electrical and Electronic Engineering, Electronic, Optical and Magnetic Materials

View Paper: https://www.semanticscholar.org/paper/d04ab786fef8cac0daf32ecbab83ea44e95752d7

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In Electrical and Electronic Engineering

1. Sen Xin
2. Yu‐Guo Guo
3. Qiang Zhang
4. Ya‐Xia Yin
5. Xin‐Bing Cheng
6. Jia-qi Huang
7. Arumugam Manthiram

In Electronic, Optical and Magnetic Materials

1. Sen Xin
2. Yu‐Guo Guo

Citations in the corpus

• Advances of polymer binders for silicon‐based anodes in high energy density lithium‐ion batteries (2021, methodology): “spontaneous crosslinking reaction between boronic acid and vicinal alcohol at room temperature; Peeling tests of Si electrodes with CMC, guar gum, and BC-g binders; Ionic conductivity of guar gum and BC-g binder films.(142) Copyright 2019, WILEY-VCH”