a) The schematic illustrates the semiquantitative analysis of gaseous by‐products and liquid by‐products by comparing the same amount of gas extracted from gas bags through GC‐MS/BID and by collecting the electrolyte from different pouch cells through NMR, in LRLO and NCM532 pouch‐type full‐cells after 60 °C storage. b) The statistical results of CO, CH3OH, CO2, C2H5OH gas evolution after high‐temperature in NCM532 and LRLO pouch‐type full‐cells. c) ¹H NMR results of LRLO pouch‐type full‐cell before and after high‐temperature storage.

a) The schematic illustrates the semiquantitative analysis of gaseous by‐products and liquid by‐products by comparing the same amount of gas extracted from gas bags through GC‐MS/BID and by collecting the electrolyte from different pouch cells through NMR, in LRLO and NCM532 pouch‐type full‐cells after 60 °C storage. b) The statistical results of CO, CH3OH, CO2, C2H5OH gas evolution after high‐temperature in NCM532 and LRLO pouch‐type full‐cells. c) ¹H NMR results of LRLO pouch‐type full‐cell before and after high‐temperature storage.

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In addressing the global climate crisis, the energy storage performance of Li‐ion batteries (LIBs) under extreme conditions, particularly for high‐energy‐density Li‐rich layered oxide (LRLO) cathode, is of the essence. Despite numerous researches into the mechanisms and optimization of LRLO cathodes under ideal moderate environment, there is a dear...