1. Qingdao Industrial Energy Storage Research InstituteQingdao Institute of Bioenergy and Bioprocess TechnologyChinese Academy of Sciences Qingdao 266101 P. R. China
2. Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake ResourcesKey Laboratory of Salt Lake Resources Chemistry of Qinghai ProvinceQinghai Institute of Salt LakesChinese Academy of Sciences Xining 810008 P. R. China
3. Center of Materials Science and Optoelectronics EngineeringUniversity of Chinese Academy of Sciences Beijing 100049 P. R. China