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Which outcome destabilizes a solid electrolyte in a battery?

A)Cation vacancy migration and polarization.
B)Anion reduction by doping alteration.
C)Electron tunneling in thin films.
D)Polymer chain entanglement reduction rate.

💡 Explanation

Solid electrolytes experiencing a voltage gradient undergo ionic polarization, so the **migration of cation vacancies** creates space charge that causes dendrite formation and cracking because this lowers the required charge transfer energy rather than preventing it, therefore structural failure of solid electrolyte.

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