Multiple directions in battery research are now being pursued with the goal of advancing beyond the specific energy limits imposed by current Li-ion batteries. When considering the design of new high-energy storage systems, new materials, processes, or chemistries are introduced that are inherently more unstable than conventional Li-ion battery materials, resulting in limited battery cycle life and safety. Two such examples of high energy battery chemistries, high voltage operation of Ni-rich Li[Ni, Mn, Co]O2 Li+ insertion electrodes (Ni-rich NMC) and Li-O2 electrochemistry, will be discussed in this presentation.

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