4.4 Article

Crosslinked Polymer Binder via Phthalic Acid for Stabilizing SiOx Anodes

Journal

MACROMOLECULAR CHEMISTRY AND PHYSICS
Volume 223, Issue 15, Pages -

Publisher

WILEY-V C H VERLAG GMBH
DOI: 10.1002/macp.202200068

Keywords

condensation reactions; crosslinked binders; lithium-ion batteries; SiOx anode

Funding

  1. National Natural Science Foundation of China [U20A20123, 51874357, 52002405]
  2. Innovative Research Group of Hunan Provincial Natural Science Foundation of China [2019JJ10006]
  3. 100 Talented program of Hunan Province
  4. Huxiang high-level talents program [2019RS1007]

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SiOx is recognized as a feasible anode material for the next generation lithium-ion batteries due to its high capacity, low cost, environmental friendliness, and abundant available storage. However, the volume expansion and irreversible by-products during lithiation can cause capacity degradation and low coulombic efficiency. A rational crosslinked binder is synthesized to effectively restrict the volume change, resulting in a high performance Si-based anode material.
It is widely recognized that SiOx is a feasible anode material for the next generation lithium-ion batteries because of its high capacity, low cost, environmental friendliness, and abundant available storage. However, the enormous volume expansion and irreversible by-products during lithiation can result in the rapid capacity degradation and low coulombic efficiency. The commercial binders of carboxymethyl cellulose (CMC) and polyvinylidene difluoride cannot afford the volume change. Herein, a rational crosslinked binder is synthesized through an in situ condensation reaction between CMC and phthalic acid (PA). With rich hydroxyl groups bonded to the homogeneous SiO2 nanodomain, the enormous volume expansion of the SiOx anode can be restricted efficaciously. Therefore, the SiOx@CMC-PA electrode delivers a reversible specific capacity of 671 mAh g(-1) at 500 mA g(-1) after 200 cycles and a high average coulombic efficiency of 99.2%, much higher than 226.3 mAh g(-1) of SiOx@CMC electrode. It demonstrates that this work offers a cost effective and available strategy to achieve high performance binder for Si-based anode materials.

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