4.7 Article

A composite PEO electrolyte with amide-based polymer matrix for suppressing lithium dendrite growth in all-solid-state lithium battery

Journal

CHINESE CHEMICAL LETTERS
Volume 33, Issue 8, Pages 3894-3898

Publisher

ELSEVIER SCIENCE INC
DOI: 10.1016/j.cclet.2021.11.073

Keywords

Composite; Amide; Lithium dendrite; Solid state electrolyte; Li metal battery

Funding

  1. National Natural Science Foundation of China [22075172]
  2. Science and Technology Commission of Shanghai Municipality [18010500300]
  3. Ningbo Natural Science Foundation [2019A610015]

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By building a composite polymer electrolyte with an amide-based matrix on porous electrodes, this research successfully inhibits the growth of lithium dendrites and improves the performance of all-solid-state lithium-ion batteries. The electrolyte exhibits good ionic conductivity, interface contact, and enhanced properties after modification.
The lithium dendrite growth is still a serious challenge and impeding the realistic applications of all-solid-state lithium batteries. In view of the amide containing sediment layer can be stable on lithium/cathodes, a composite polymer electrolyte with amide-based matrix is in-situ built on porous electrodes. With the introduction of amide, the polymer electrolyte presents excellent ability to inhibit lithium dendrite growth and makes the Li/Li symmetric battery stably work for 500 h with a good ionic conductivity of 4.25 x 10(-5) S/cm at 40 degrees C. The solid electrolyte also shows a wide electrochemical stable window and good interface contact with the porous cathode. Utilizing this composite polymer electrolyte, the all-solid-state Li/LiFePO4 battery shows an initial discharge capacity of 146.5 mAh/g at 0.1 C under 40 degrees C and remains 81.4% in 100 cycles. The polymer electrolyte also can present better properties after modification. These results demonstrate that the presented PA-based composite polymer electrolyte could be served as a good electrolyte candidate for all-solid-state lithium-ion batteries. (C) 2022 Published by Elsevier B.V. on behalf of Chinese Chemical Society and Institute of Materia Medica, Chinese Academy of Medical Sciences.

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