Open AccessDendrite‐accelerated thermal runaway mechanisms of lithium metal pouch batteries
Author(s) -
Xu XiangQun,
Cheng XinBing,
Jiang FengNi,
Yang ShiJie,
Ren Dongsheng,
Shi Peng,
Hsu HungJen,
Yuan Hong,
Huang JiaQi,
Ouyang Minggao,
Zhang Qiang
Publication year - 2022
Publication title -
susmat
Language(s) - English
Resource type - Journals
ISSN - 2692-4552
DOI - 10.1002/sus2.74
Subject(s) - thermal runaway , dendrite (mathematics) , materials science , differential scanning calorimetry , lithium metal , anode , lithium (medication) , electrolyte , energy density , calorimetry , chemistry , battery (electricity) , thermodynamics , electrode , engineering physics , medicine , power (physics) , physics , geometry , mathematics , engineering , endocrinology
High‐energy‐density lithium metal batteries (LMBs) are widely accepted as promising next‐generation energy storage systems. However, the safety features of practical LMBs are rarely explored quantitatively. Herein, the thermal runaway behaviors of a 3.26 Ah (343 Wh kg −1 ) Li | LiNi 0.5 Co 0.2 Mn 0.3 O 2 pouch cell in the whole life cycle are quantitatively investigated by extended volume‐accelerating rate calorimetry and differential scanning calorimetry. By thermal failure analyses on pristine cell with fresh Li metal, activated cell with once plated dendrites, and 20‐cycled cell with large quantities of dendrites and dead Li, dendrite‐accelerated thermal runaway mechanisms including reaction sequence and heat release contribution are reached. Suppressing dendrite growth and reducing the reactivity between Li metal anode and electrolyte at high temperature are effective strategies to enhance the safety performance of LMBs. These findings can largely enhance the understanding on the thermal runaway behaviors of Li metal pouch cells in practical working conditions.