Safer high energy battery

摘要

A lithium secondary cell includes a plurality of stacked layers. Each stacked layer includes a lithium-containing positive electrode in electronic contact with a positive electrode current collector, a negative electrode in electronic contact with a negative electrode current collector, a separator positioned between the positive electrode and the negative electrode, and an electrolyte in ionic contact with the positive and negative electrodes. The positive current collector is in electrical connection with an external circuit and has a total thickness of at least about 200 mum. The negative current collector is in electrical connection with an external circuit. The total cell polarization during a failure event reduces the rate of discharge such that catastrophic failure does not occur. Thus, the lithium secondary cell exhibits safer failure modes than conventional cells known in the art.