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Which risk increases when thermal runaway narrows oxide band gap in Lithium-ion cells?

A)Electrolyte phase transition increases sharply
B)Current density becomes spatially localized
C)Cathode material crystal structure degrades
D)Charge carrier mobility becomes saturated

💡 Explanation

Localized current density risk grows because narrowing the band gap increases electronic conductivity via increased carrier delocalization due to increased temperatures. This thermal runaway feedback further constricts the oxide band gap, therefore increasing current concentrations rather than other effects.

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