Premium
A Study of Model‐Based Protective Fast‐Charging and Associated Degradation in Commercial Smartphone Cells: Insights on Cathode Degradation as a Result of Lithium Depositions on the Anode
Author(s) -
Besli Münir M.,
Subbaraman Anantharaman,
Pour Safaei Farshad R.,
Johnston Christina,
Schneider Gerhard,
Ravi Nikhil,
Christensen Jake,
Liu Yijin,
Doeff Marca M.,
Metzger Michael,
Kuppan Saravanan
Publication year - 2021
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.202003019
Subject(s) - anode , materials science , cathode , battery (electricity) , degradation (telecommunications) , lithium (medication) , electrode , foil method , intercalation (chemistry) , chemical engineering , optoelectronics , computer science , composite material , electrical engineering , inorganic chemistry , chemistry , medicine , telecommunications , power (physics) , physics , quantum mechanics , endocrinology , engineering
The ever expanding mobile consumer electronic market has accelerated the need for safe and efficient fast‐charging approaches that improve the overall speed of battery charging without hastened deterioration of the battery performance. Herein, the impact of a resource inexpensive, physics‐based, electrochemically optimized fast‐charging algorithm (charging time < 2 h) for mobile devices is investigated. A critical difference in the amount and morphology of lithium deposits on the anode for cells fast‐charged without an optimized algorithm is observed and found to be the main cause of capacity decay. An in‐depth study of the LiCoO 2 cathode regions opposite to pronounced lithium deposits on the anode reveals a “mirroring” phenomenon, i.e., a frozen monoclinic phase, and inactivity to relithiation. In operando hard X‐ray absorption spectroscopy reveals that degraded spots on harvested cathodes seem to be activated again and participate in the intercalation process when lithiated at low rates from lithium foil counter electrodes. On the other hand, tests at higher C‐rates, closer to the actual fast‐charging rate, reveal only negligible oxidation state changes and therefore poor performance.