论文部分内容阅读
Since SONYs invention in 1991,energy density of lithium ion batteries increases about 5.5 Wh/kg every year from initial 90 Wh/kg to current 210 Wh/kg.Obviously,breakthrough is needed in order to reach the target of 300500 Wh/kg before 2020 to satisfy the demanding from various applications,such as electrical vehicles,robot,advanced electronic devices.