4.8 Review

Recent Advances and Perspectives on the Polymer Electrolytes for Sodium/Potassium-Ion Batteries

Journal

SMALL
Volume 17, Issue 31, Pages -

Publisher

WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.202006627

Keywords

ionic conductivity; polymer electrolytes; potassium-ion batteries; sodium-ion batteries

Funding

  1. Key-Area Research and Development Program of Guangdong Province [2019B090914003]
  2. National Natural Science Foundation of China [11904379, 51822210, 51972329]
  3. Shenzhen Science and Technology Planning Project [JCYJ20200109115624923, JCYJ20190807171803813, KQTD20161129150510559]
  4. China Postdoctoral Science Foundation [2018M643235]
  5. Natural Science Foundation of Guangdong Province [2019A1515011902]

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This article thoroughly discusses the electrolyte selection for SIBs/KIBs, with a focus on the advantages and mechanisms of PEs, showcasing the latest research progress on SIBs/KIBs based on PEs. Suggestions and perspectives for future research are also put forward.
Owing to the low cost of sodium/potassium resources and similar electrochemical properties of Na+/K+ to Li+, sodium-ion batteries (SIBs) and potassium-ion batteries (KIBs) are regarded as promising alternatives to lithium-ion batteries (LIBs) in large-scale energy storage field. However, traditional organic liquid electrolytes bestow SIBs/KIBs with serious safety concerns. In contrast, quasi-/solid-phase electrolytes including polymer electrolytes (PEs) and inorganic solid electrolytes (ISEs) show great superiority of high safety. However, the poor processibility and relatively low ionic conductivity of Na+ and K+ ions limit the further practical applications of ISEs. PEs combine some merits of both liquid-phase electrolytes and ISEs, and present great potentials in next-generation energy storage systems. Considerable efforts have been devoted to improving their overall properties. Nevertheless, there is still a lack of an in-depth and comprehensive review to get insights into mechanisms and corresponding design strategies of PEs. Herein, the advantages of different electrolytes, particularly PEs are first minutely reviewed, and the mechanism of PEs for Na+/K+ ion transfer is summarized. Then, representative researches and recent progresses of SIBs/KIBs based on PEs are presented. Finally, some suggestions and perspectives are put forward to provide some possible directions for the follow-up researches.

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