Development of low-temperature and high-rate lithium-ion batteries

摘要

Lithium-ion batteries have weak points in low-temperature and high-rate performance. We take aim at overcoming these weak points and have developed lithium-ion batteries durable under low-temperature and high-rate. The minimum operating temperature of the newly developed MC-18650A(cylindrical type, diameter:18mm, height:65mm) is 10℃ lower than that of our former types. We also confirmed high-rate discharge performance (maximum operating current is about twice larger than our old type battery). In order to develop a high performance battery, it is important that the elements of positive electrode, negative electrode, and electrolyte are improved. We report on the outline of technical points of low-temperature and high-rate performance battery and then report the performance (low-temperature, rate, cycle life, storage, and safety property) of the MC-18650A.