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Extreme Fast‐Charging of Lithium‐Ion Cells: Effect on Anode and Electrolyte
Author(s) -
Yang Zhenzhen,
Morrissette James W.,
Meisner Quinton,
Son Seoung-Bum,
Trask Stephen E.,
Tsai Yifen,
Lopykinski Susan,
Naik Seema,
Bloom Ira
Publication year - 2021
Publication title -
energy technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.91
H-Index - 44
eISSN - 2194-4296
pISSN - 2194-4288
DOI - 10.1002/ente.202000696
Subject(s) - electrolyte , anode , lithium (medication) , decomposition , ion , chemistry , electrochemistry , inorganic chemistry , materials science , analytical chemistry (journal) , electrode , organic chemistry , endocrinology , medicine
Herein, the effects of charge rate in coin cells containing NMC532/1506‐T graphite are investigated. The cells are cycled at room temperature using charge rates of 1‐, 2‐, 4‐, and 8‐C and discharged at the 1‐C rate for 50 cycles. The amounts of lithium and LiF are found to be highly correlated with charge time. Three decomposition products are identified in the organic electrolyte. The proposed, empirical formulae for these compounds are C 14 H 33 O 15 P 3 , C 16 H 37 O 15 P 3 , and C 11 H 22 O 7 PF; all are most likely organophosphates formed by the reaction of organic electrolyte decomposition products with LiPF 6 or P(=O)F 3 . The relative concentrations of these organics do not display sensitivity to charge rate. These results imply that a new performance fade mechanism is not introduced by electrolyte decomposition.