Importance

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Abstract

A lithium ion battery has an anode comprising a current collector, a separator and an active material layer having active material particles. Each active material particle comprises a core of an alloying material including silicon and a polymer coating on the core, the polymer coating comprising a heat-shrinking polymer that shrinks as temperature increases. As cycling increases across a life of the lithium ion battery, an expansion amount of the alloying material of the core increases, temperature of the anode increases, and an amount of shrinkage of the polymer coating increases, such that as the core attempts to expand against the polymer coating, the polymer coating exerts an opposite force on the core.

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First Claim