Fine Granular Alumina

coating α- Al₂O₃ separator has higher temperature resistance effect than polyolefin separator and maintains its dimensional integrity at temperatures up to 200 ℃. This eliminates the possibility of a short circuit during thermal runaway. The electrochemical performance of lithium-ion battery at room temperature is equivalent to that of polyolefin membrane. However, coated alumina separator cells show better cycle performance at extreme temperatures of - 30 ° C to 60 ° C.

(1) Long cycle life. The mechanical micro short circuit in the cycle process is reduced and the cycle life is effectively improved. Advantage 2: high magnification. Alumina can form solid solution in lithium battery to improve the rate and cycle performance.
(2) High purity alumina also has excellent thermal conductivity. When the battery temperature is too high, this material can conduct heat well, so as to solve the problem of poor thermal        conductivity of PP / PE material.
(3) When the current is too large, it can block the current. With the continuous improvement of the capacity of lithium-ion battery, the internal accumulated energy becomes larger and larger, and the internal temperature will increase. It is possible that the high temperature will melt the negative diaphragm and cause a short circuit.