Open AccessPorous polyimide separator promotes uniform lithium plating for lithium‐free cells
Author(s) -
Pai JuiYu,
Ku HaoYu,
Lin ChunCheng,
Chiang ChienWei,
Hardwick Laurence J.,
Hu ChiChang
Publication year - 2022
Publication title -
electrochemical science advances
Language(s) - English
Resource type - Journals
ISSN - 2698-5977
DOI - 10.1002/elsa.202100091
Subject(s) - separator (oil production) , polyimide , electrolyte , materials science , ethylene carbonate , lithium carbonate , nucleation , chemical engineering , plating (geology) , inorganic chemistry , polymer chemistry , chemistry , composite material , ion , electrode , organic chemistry , layer (electronics) , ionic bonding , physics , geophysics , engineering , thermodynamics , geology
Electrospun polyimide (PI) separators were found to reduce the charge‐transfer resistance of Li plating/stripping and the overpotentials of Li nucleation/growth onto Cu foils in the 1.2 M LiPF 6 /(ethylene carbonate/dimethyl carbonate = 1/1) electrolyte without any additives in comparison with polyethylene (PE) separators. Lithium deposition through the PI separator led to the formation of a granular morphology of 15–30 µm in diameter compared to lithium dendrites using PE. A similar trend of lithium deposition was observed in LiFePO 4 //Cu cells. The PI separator was found to enhance the discharge capacity and cycle life of Li plating/stripping in the Li//Cu and LiFePO 4 //Cu cells containing 40 µl electrolytes, verifying that the PI separator provides dendrite inhibition capability for the lithium‐metal‐free cells.