title: Exploration of Ca0.5Ti2(PO4)3@carbon Nanocomposite as the High-Rate Negative Electrode for Na-Ion Batteries.
abstract: Exploring suitable electrode materials with high specific capacity and high-rate capability is a challenging goal for the development of Na-ion batteries. Here, we report a NASICON-structured compound, Ca0.5Ti2(PO4)3, with respect to its synthesis and electrochemical properties. The electrode is found to enable fast Na+ion diffusion owing to the rich crystallographic vacancies, affording a reversible capacity of 264 mA h g-1between 3.0 and 0.01 V. In particular, the hybrid Ca0.5Ti2(PO4)3@carbon exhibits remarkable rate performance with a discharge capacity of nearly 45 mA h g-1at a current density of 20 A g-1, which is attributed to the pseudocapacitive effect.
authors.affiliation: Key Laboratory of Physics and Technology for Advanced Batteries (Ministry of Education), College of Physics, Jilin University , Changchun, 130012, People's Republic of China.
authors.forename: Zhixuan
authors.initials: Z
authors.lastname: Wei
authors.affiliation: Key Laboratory of Physics and Technology for Advanced Batteries (Ministry of Education), College of Physics, Jilin University , Changchun, 130012, People's Republic of China.
authors.forename: Xing
authors.initials: X
authors.lastname: Meng
authors.affiliation: Key Laboratory of Physics and Technology for Advanced Batteries (Ministry of Education), College of Physics, Jilin University , Changchun, 130012, People's Republic of China.
authors.forename: Ye
authors.initials: Y
authors.lastname: Yao
authors.affiliation: Key Laboratory of Physics and Technology for Advanced Batteries (Ministry of Education), College of Physics, Jilin University , Changchun, 130012, People's Republic of China.
authors.forename: Qiang
authors.initials: Q
authors.lastname: Liu
authors.affiliation: Key Laboratory of Physics and Technology for Advanced Batteries (Ministry of Education), College of Physics, Jilin University , Changchun, 130012, People's Republic of China.
authors.forename: Chunzhong
authors.initials: C
authors.lastname: Wang
authors.affiliation: Key Laboratory of Physics and Technology for Advanced Batteries (Ministry of Education), College of Physics, Jilin University , Changchun, 130012, People's Republic of China.
authors.forename: Yingjin
authors.initials: Y
authors.lastname: Wei
authors.affiliation: Key Laboratory of Physics and Technology for Advanced Batteries (Ministry of Education), College of Physics, Jilin University , Changchun, 130012, People's Republic of China.
authors.forename: Fei
authors.identifier: http://orcid.org/0000-0001-6413-0689
authors.initials: F
authors.lastname: Du
authors.affiliation: Key Laboratory of Physics and Technology for Advanced Batteries (Ministry of Education), College of Physics, Jilin University , Changchun, 130012, People's Republic of China.|State Key Laboratory of Superhard Materials, Jilin University , Changchun, 130012, People's Republic of China.
authors.forename: Gang
authors.initials: G
authors.lastname: Chen
keywords: NASICON-structure; Na-ion battery; high-rate performance; negative electrode; pseudocapacitive effect