A Breakthrough in the Safety of Lithium Secondary Batteries by Coating the Cathode Material with AlPO_4 Nanoparticles

摘要

The production of lithium secondary batteries (Li-ion and Li-polymer cells) has rapidly expanded because of their applic-ability to mobile electronics, such as cellular phones, camcorders, personal digital assistants (PDAs), and notebook personal computers. Sales of Li secondary batteries were expected to increase to more than 1 billion cells in 2002.l Even though most Li secondary batteries use LiCoO_2 as a cathode material, because of its high volumetric energy density and excellent high-temperature performance (such as the cycle life at 60 deg C and swelling characteristics at 90 deg C), their safety is still a major concern, and are less safe as the capacity of the battery increases.~[1,2]