Rechargeable battery cells and packs with high capacity, expandable temperature range, and high tolerance for overcharging and discharging misuse

摘要

Provided is an electrochemical secondary battery that exhibits excellent misuse tolerance in overdischarge and overcharge conditions including at extreme temperatures, remains robust, and has excellent performance. The battery provided herein has the formula Li 1+x MO 2+y (where -0.9≤x≤0.3, -0.3≤y≤0.3, and M contains 80 atomic% or more of Ni based on the total M ) comprising a cathode comprising an electrochemically active material and an anode comprising an anode electrochemically active material defined as an electrochemical redox potential of at least 400 mV with respect to Li/Li + .