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- Title
An Endotenon Sheath-Inspired Double-Network Binder Enables Superior Cycling Performance of Silicon Electrodes.
- Authors
Jiang, Meifang; Mu, Pengzhou; Zhang, Huanrui; Dong, Tiantian; Tang, Ben; Qiu, Huayu; Chen, Zhou; Cui, Guanglei
- Abstract
Highlights: The double-network binder shows excellent adhesive and self-healing abilities, which help suppress electrode volume expansion and stabilize the electrode interface upon cycling. This binder induces a Li3N/LiF-rich solid electrolyte interface layer, which can suppress continuous electrolyte decomposition. Superior electrochemical performance can be achieved in Si/Li half cells and LiNi0.8Co0.1Mn0.1O2/Si full cells, even with a high loading of Si electrode. Silicon (Si) has been regarded as an alternative anode material to traditional graphite owing to its higher theoretical capacity (4200 vs. 372 mAh g−1). However, Si anodes suffer from the inherent volume expansion and unstable solid electrolyte interphase, thus experiencing fast capacity decay, which hinders their commercial application. To address this, herein, an endotenon sheath-inspired water-soluble double-network binder (DNB) is presented for resolving the bottleneck of Si anodes. The as-developed binder shows excellent adhesion, high mechanical properties, and a considerable self-healing capability mainly benefited by its supramolecular hybrid network. Apart from these advantages, this binder also induces a Li3N/LiF-rich solid electrolyte interface layer, contributing to a superior cycle stability of Si electrodes. As expected, the DNB can achieve mechanically more stable Si electrodes than traditional polyacrylic acid and pectin binders. As a result, DNB delivers superior electrochemical performance of Si/Li half cells and LiNi0.8Co0.1Mn0.1O2/Si full cells, even with a high loading of Si electrode, to traditional polyacrylic acid and pectin binders. The bioinspired binder design provides a promising route to achieve long-life Si anode-assembled lithium batteries.
- Subjects
ELECTRODE performance; SELF-healing materials; SOLID electrolytes; EXPANSION of solids; LITHIUM cells; POLYACRYLIC acid; PLASMA sheaths
- Publication
Nano-Micro Letters, 2022, Vol 14, Issue 1, p1
- ISSN
2311-6706
- Publication type
Article
- DOI
10.1007/s40820-022-00833-5