1. Key Laboratory of Graphene Technologies and Applications of Zhejiang Province and Advanced Li-Ion Battery Engineering Laboratory; Ningbo Institute of Materials Technology and Engineering (NIMTE); Chinese Academy of Sciences (CAS); Ningbo 315201 P. R. China
2. College of Materials Science and Opto-Electronic Technology; University of Chinese Academy of Sciences (UCAS); Beijing 100049 P. R. China
3. The School of Material Science and Chemical Engineering; Ningbo University; Ningbo 315211 P. R. China