title: Improving the electrochemical properties of LiNi(0.5)Co(0.2)Mn(0.3)O2 at 4.6 V cutoff potential by surface coating with Li2TiO3 for lithium-ion batteries.
abstract: The Li2TiO3-coated LiNi0.5Co0.2Mn0.3O2 (LTO@NCM) cathode materials are synthesized via an in situ co-precipitation method followed by the lithiation process and thermal annealing. The Li2TiO3 coating layer is designed to strongly adhere to the core-material with 3D diffusion pathways for Li(+) ions. Electrochemical tests suggest that compared with pristine NCM, Li2TiO3 serves as both a Li ion conductive layer and a protective coating layer against the attack of HF in the electrolyte, and remarkably improves the cycling performance at higher charged state and rate capability of the LTO@NCM composite material. What is more, phase transformation of NCM and dissolution of metal ions at high-temperatures at 4.6 V cutoff potential are effectively suppressed after LTO-coating. Our study demonstrates that LTO-coating on the surface of NCM is a viable method to improve the electrochemical performance of NCM, especially at high rates and under high-voltage charged conditions.
authors.affiliation: State Key Lab of Physical Chemistry of Solid Surfaces, Department of Chemistry, Collaborative Innovation Center of Chemistry for Energy Materials, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, 361005, P. R. China. jbzhao@xmu.edu.cn.
authors.forename: Jing
authors.initials: J
authors.lastname: Wang
authors.affiliation: State Key Lab of Physical Chemistry of Solid Surfaces, Department of Chemistry, Collaborative Innovation Center of Chemistry for Energy Materials, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, 361005, P. R. China. jbzhao@xmu.edu.cn.
authors.forename: Yangyang
authors.initials: Y
authors.lastname: Yu
authors.affiliation: School of Energy Research, Xiamen University, Xiamen, 361005, P. R. China.
authors.forename: Bing
authors.initials: B
authors.lastname: Li
authors.affiliation: State Key Lab of Physical Chemistry of Solid Surfaces, Department of Chemistry, Collaborative Innovation Center of Chemistry for Energy Materials, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, 361005, P. R. China. jbzhao@xmu.edu.cn.
authors.forename: Tao
authors.initials: T
authors.lastname: Fu
authors.affiliation: State Key Lab of Physical Chemistry of Solid Surfaces, Department of Chemistry, Collaborative Innovation Center of Chemistry for Energy Materials, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, 361005, P. R. China. jbzhao@xmu.edu.cn.
authors.forename: Dongquan
authors.initials: D
authors.lastname: Xie
authors.affiliation: State Key Lab of Physical Chemistry of Solid Surfaces, Department of Chemistry, Collaborative Innovation Center of Chemistry for Energy Materials, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, 361005, P. R. China. jbzhao@xmu.edu.cn.
authors.forename: Jijun
authors.initials: J
authors.lastname: Cai
authors.affiliation: State Key Lab of Physical Chemistry of Solid Surfaces, Department of Chemistry, Collaborative Innovation Center of Chemistry for Energy Materials, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, 361005, P. R. China. jbzhao@xmu.edu.cn and School of Energy Research, Xiamen University, Xiamen, 361005, P. R. China.
authors.forename: Jinbao
authors.initials: J
authors.lastname: Zhao