Discharge voltage-Dependent Structural Degradation and Gas Evolution (IMAGE)

Pohang University of Science & Technology (POSTECH)

Discharge voltage-Dependent Structural Degradation and Gas Evolution

Caption

(a) Irreversible structural changes were observed on the surface after 150 charge/discharge cycles within the voltage range in which the quasi-conversion reaction occurs.

(b) The original layered structure was preserved even after 150 cycles within a more stable voltage range.

(c) When high nickel pouch-type cells were cycled more than 250 times at 1.9 V (where the quasi-conversion reaction occurs) and 3.15 V (where it does not), capacity retention improved significantly solely by adjusting the discharge cutoff voltage.

(d) Increasing the discharge voltage effectively suppressed oxygen loss and subsequent side reactions at the surface, resulting in a significant reduction in the evolution of gases (CO, CO₂, CH₄, and C₂H₄).

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POSTECH

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