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← ScienceWhich consequence results when prolonged over-discharge occurs in lithium iron phosphate (LiFePO4) batteries that use ionic conductive polymer electrolytes?
A)Internal resistance uncontrollably increases✓
B)Cathode particles undergo reduction
C)Electrolyte oxidation slows lithium transport
D)Phase segregation destabilizes interface
💡 Explanation
Increased internal resistance occurs because during over-discharge, interfacial polarization increases, impeding Li+ ion migration across anode-electrolyte interface via Grotthuss mechanism. Because lithium gets trapped, the battery’s resistance gradually increases, thereby leading to total failure; rather than simple loss of capacity under normal use.
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