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We report on \textit{ab initio} electronic structure simulations ofLi$_2$O$_2$, where 1.6% of lithium atoms are substituted by silicon. It isdemonstrated that this leads to the formation of conducting impurity states inthe band gap of Li$_2$O$_2$. We show that these states originate from theantibonding orbitals of the oxygen pairs and are remarkably stable againstpossible polaron formation (upon electron injection). Through this polaronpreemption mechanism, the proposed compound is expected to show significantlyhigher electronic mobility than stoichiometric Li$_2$O$_2$, which could havesignificant applications in lithium-air batteries.

Improving Li$_2$O$_2$ conductance via polaron preemption: an \textit{ab initio} study of Si doping