Advanced Science (Sep 2022)

Percolated Sulfide in Salt‐Concentrated Polymer Matrices Extricating High‐Voltage All‐Solid‐State Lithium‐metal Batteries

  • Feng Jiang,
  • Yantao Wang,
  • Jiangwei Ju,
  • Qian Zhou,
  • Longfei Cui,
  • Jinzhi Wang,
  • Guoxi Zhu,
  • Huancheng Miao,
  • Xinhong Zhou,
  • Guanglei Cui

DOI
https://doi.org/10.1002/advs.202202474
Journal volume & issue
Vol. 9, no. 25
pp. n/a – n/a

Abstract

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Abstract All‐solid‐state lithium‐metal batteries (ASLMBs) are considered to be remarkably promising energy storage devices owing to their high safety and energy density. However, the limitations of current solid electrolytes in oxidation stability and ion transport properties have emerged as fundamental barriers in practical applications. Herein, a novel solid electrolyte is presented by in situ polymerization of salt‐concentrated poly(ethylene glycol) diglycidyl ether (PEGDE) implanted with a three‐dimensional porous L10GeP2S12 skeleton to mitigate these issues. The poly(PEGDE) endows more oxygen atoms to coordinate with Li+, significantly lowering its highest occupied molecular orbital level. As a consequence, the electro‐oxidation resistance of poly(PEGDE) exceeds 4.7 V versus Li+/Li. Simultaneously, the three‐dimensonal porous L10GeP2S12 skeleton provides a percolated pathway for rapid Li+ migration, ensuring a sufficient ionic conductivity of 7.7 × 10−4 S cm−1 at room temperature. As the bottlenecks are well solved, 4.5 V LiNi0.8Mn0.1Co0.1O2‐based ASLMBs present fantastic cycle performance over 200 cycles with an average Coulombic efficiency exceeding 99.6% at room temperature.

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