title: Facile Synthesis of Rod-like Cu2-xSe and Insight into its Improved Lithium-Storage Property.
abstract: A rod-like Cu2-xSe is synthesized by a facile water evaporation process. The electrochemical reaction mechanism is investigated by ex situ X-ray diffraction (XRD). By adopting an ether-based electrolyte instead of a carbonate-based electrolyte, the electrochemical performance of Cu2-xSe electrodes improved significantly. The Cu2-xSe electrodes exhibit outstanding cycle performance: after 1000 cycles, 160 mA h g-1can be maintained with a retention of 80.3 %. At current densities of 100, 200, 500, and 1000 mA g-1, the capacity of a Cu2-xSe/Li battery was 208, 202, 200, and 198 mA h g-1, respectively, showing excellent rate capability. The 4-probe conductivity measurements along with electrochemical impendence spectroscopy (EIS) and cyclic voltammetry (CV) tests illustrate that the Cu2-xSe electrodes display high specific conductivity and impressive lithium-ion diffusion rate, which makes the Cu2-xSe a promising anode material for lithium-ion batteries.
authors.affiliation: State Key Laboratory of Physical Chemistry of Solid Surfaces, Collaborative Innovation Center of Chemistry for Energy Materials, State-Province Joint Engineering Laboratory of Power Source Technology for New Energy Vehicle, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, Fujian, P. R. China.
authors.forename: He
authors.initials: H
authors.lastname: Li
authors.affiliation: State Key Laboratory of Physical Chemistry of Solid Surfaces, Collaborative Innovation Center of Chemistry for Energy Materials, State-Province Joint Engineering Laboratory of Power Source Technology for New Energy Vehicle, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, Fujian, P. R. China.
authors.forename: Jiali
authors.initials: J
authors.lastname: Jiang
authors.affiliation: State Key Laboratory of Physical Chemistry of Solid Surfaces, Collaborative Innovation Center of Chemistry for Energy Materials, State-Province Joint Engineering Laboratory of Power Source Technology for New Energy Vehicle, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, Fujian, P. R. China.
authors.forename: Feng
authors.initials: F
authors.lastname: Wang
authors.affiliation: State Key Laboratory of Physical Chemistry of Solid Surfaces, Collaborative Innovation Center of Chemistry for Energy Materials, State-Province Joint Engineering Laboratory of Power Source Technology for New Energy Vehicle, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, Fujian, P. R. China.
authors.forename: Jianxing
authors.initials: J
authors.lastname: Huang
authors.affiliation: State Key Laboratory of Physical Chemistry of Solid Surfaces, Collaborative Innovation Center of Chemistry for Energy Materials, State-Province Joint Engineering Laboratory of Power Source Technology for New Energy Vehicle, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, Fujian, P. R. China.
authors.forename: Yunhui
authors.initials: Y
authors.lastname: Wang
authors.affiliation: State Key Laboratory of Physical Chemistry of Solid Surfaces, Collaborative Innovation Center of Chemistry for Energy Materials, State-Province Joint Engineering Laboratory of Power Source Technology for New Energy Vehicle, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, Fujian, P. R. China.
authors.forename: Yiyong
authors.initials: Y
authors.lastname: Zhang
authors.affiliation: State Key Laboratory of Physical Chemistry of Solid Surfaces, Collaborative Innovation Center of Chemistry for Energy Materials, State-Province Joint Engineering Laboratory of Power Source Technology for New Energy Vehicle, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, Fujian, P. R. China.
authors.forename: Jinbao
authors.initials: J
authors.lastname: Zhao
mesh_terms: D003300:Copper / Q000737:chemistry*; D011211:Electric Power Supplies; D008094:Lithium / Q000737:chemistry*; D008854:Microscopy, Electron; D012643:Selenium / Q000737:chemistry*; D013059:Spectrum Analysis, Raman; D014961:X-Ray Diffraction
chemical_list: D003300:Copper; D008094:Lithium; D012643:Selenium
keywords: copper selenide; dft calculation; electrochemical kinetics; lithium-ion batteries; x-ray diffraction