Electric vehicle batteries 'must improve'

BYD Auto Co Ltd's F3DM plug-in hybrid compact sedan on display at the 2011 Shanghai Auto Show. According to Zhen Zijian, deputy director of the office for electric vehicles at the Ministry of Science and Technology, 2015 might be the turning point for electric vehicles in China as the required technologies are likely to experience big breakthroughs. Xu Congjun / For China Daily