[1] Max Planck Inst Solid State Res, Heisenbergstr 1, D-70569 Stuttgart, Germany
[2] S China Univ Technol, Sch Mat Sci & Engn, Key Lab Adv Energy Storage Mat Guangdong Prov, Guangzhou 510641, Guangdong, Peoples R China
[3] Chinese Acad Sci, Inst Phys, Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R China
[4] Collaborat Innovat Ctr Quantum Matter, Beijing 100190, Peoples R China
[5] Univ Sci & Technol China, Chinese Acad Sci, Dept Chem & Mat Sci, Key Lab Mat Energy Convers, Hefei 230026, Anhui, Peoples R China