title: A Strategy for Synthesis of Nanosheets Consisting of Alternating Spinel Li4Ti5O12and Rutile TiO2Lamellas for High-Rate Anodes of Lithium-Ion Batteries.
abstract: Ultrathin dual phase nanosheets consisting of alternating spinel Li4Ti5O12(LTO) and rutile TiO2(RT) lamellas are synthesized through a facile and scalable hydrothermal method, and the formation mechanism is explored. The thickness of constituent lamellas can be controlled exactly by adjusting the mole ratio of Li:Ti in the original reactants. Alternating insertion of the RT lamellas significantly improves the electrochemical performance of LTO nanosheets, especially at high charge/discharge rates. As anodes in lithium-ion batteries (LIBs), the dual phase nanosheet electrode with the optimized phase ratio can deliver stable discharge capacities of 178.5, 154.9, 148.4, 142.3, 138.2, and 131.4 mA h g-1at current densities of 1, 10, 20, 30, 40, and 50 C, respectively. Meanwhile, they inherit the excellent cyclic stability of pure spinel LTO and exhibit a capacity retention of 93.1% even after 500 cycles at 50 C. Our results indicate that the alternating nanoscaled lamella structure is a good alternative to facilitate the transfer of both the Li ions and electrons into the spinel LTO, giving rise to an excellent cyclability and fast rate performance. Therefore, the newly prepared carbon-free LTO-RT nanosheets with high safety provide a new opportunity to develop high-power anodes for LIBs.
authors.affiliation: Key Laboratory of Automobile Materials, Department of Materials Science and Engineering, Jilin University , Changchun 130025, P.R. China.
authors.forename: Libo
authors.initials: L
authors.lastname: Wu
authors.affiliation: Key Laboratory of Automobile Materials, Department of Materials Science and Engineering, Jilin University , Changchun 130025, P.R. China.
authors.forename: Xuning
authors.initials: X
authors.lastname: Leng
authors.affiliation: Key Laboratory of Bionic Engineering (Ministry of Education) and State Key Laboratory of Automotive Simulation and Control, Jilin University , Changchun 130022, P.R. China.
authors.forename: Yan
authors.initials: Y
authors.lastname: Liu
authors.affiliation: Key Laboratory of Advanced Structural Materials, Changchun University of Technology , Changchun 130012, P.R. China.
authors.forename: Sufeng
authors.initials: S
authors.lastname: Wei
authors.affiliation: Key Laboratory of Automobile Materials, Department of Materials Science and Engineering, Jilin University , Changchun 130025, P.R. China.
authors.forename: Chunlin
authors.initials: C
authors.lastname: Li
authors.affiliation: Key Laboratory of Automobile Materials, Department of Materials Science and Engineering, Jilin University , Changchun 130025, P.R. China.
authors.forename: Guoyong
authors.initials: G
authors.lastname: Wang
authors.affiliation: Key Laboratory of Automobile Materials, Department of Materials Science and Engineering, Jilin University , Changchun 130025, P.R. China.
authors.forename: Jianshe
authors.initials: J
authors.lastname: Lian
authors.affiliation: Key Laboratory of Automobile Materials, Department of Materials Science and Engineering, Jilin University , Changchun 130025, P.R. China.
authors.forename: Qing
authors.initials: Q
authors.lastname: Jiang
authors.affiliation: Shanghai University Materials Genome Institute and Shanghai Materials Genome Institute, Shanghai University , Shanghai 200444, P.R. China.
authors.forename: Anmin
authors.identifier: http://orcid.org/0000-0002-0180-1366
authors.initials: A
authors.lastname: Nie
authors.affiliation: Shanghai University Materials Genome Institute and Shanghai Materials Genome Institute, Shanghai University , Shanghai 200444, P.R. China.
authors.forename: Tong-Yi
authors.identifier: http://orcid.org/0000-0002-9646-9668
authors.initials: TY
authors.lastname: Zhang
keywords: dual phase; hydrothermal method; lithium titanate; lithium-ion batteries; rutile titanium oxide