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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
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Single lithium-ion channel polymer binder for stabilizing sulfur cathodes.

Chaoqun Niu1, Jie Liu1, Tao Qian1

  • 1College of Energy, Collaborative Innovation Center of Suzhou Nano Science and Technology, Key Laboratory of Advanced Carbon Materials and Wearable Energy Technologies of Jiangsu Province, Soochow University, Suzhou 215006, China.

National Science Review
|October 25, 2021
PubMed
Summary

Researchers developed a novel polymer binder for lithium-sulfur batteries. This binder enables fast lithium-ion transport and blocks polysulfide shuttling, significantly improving battery performance and lifespan.

Keywords:
lithium–sulfur batteriespolymer binderspolysulfide intermediatessingle lithium-ion channels

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Lithium-sulfur batteries offer high theoretical energy density but suffer from polysulfide shuttling, limiting their practical use.
  • Polysulfide diffusion to the electrolyte causes capacity decay and low Coulombic efficiency in lithium-sulfur batteries.

Purpose of the Study:

  • To design and synthesize a novel polymer binder that facilitates lithium-ion transport while suppressing polysulfide shuttling.
  • To enhance the electrochemical performance and cycling stability of lithium-sulfur batteries.

Main Methods:

  • Synthesis of a novel polymer binder with single lithium-ion channels.
  • Electrochemical testing of sulfur cathodes using the novel binder.
  • In situ UV-vis spectroscopy to analyze polysulfide immobilization.

Main Results:

  • The polymer binder effectively immobilizes polysulfide intermediates, confirmed by in situ UV-vis spectroscopy.
  • The sulfur cathode achieved a high specific capacity of 1310 mAh g-1 at 0.2 C.
  • High Coulombic efficiency (99.5% at 0.5 C after 100 cycles) and stable cycling for 300 cycles at 1 C were observed.

Conclusions:

  • The developed polymer binder with single lithium-ion channels successfully addresses polysulfide shuttling in lithium-sulfur batteries.
  • This approach offers a promising strategy for mitigating capacity attenuation and improving the longevity of high-performance energy storage devices.