A germanium and zinc chalcogenide as an anode for a high-capacity and long cycle life lithium battery |
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| Authors: | Xu Chen Jian Zhou Jiarui Li Haiyan Luo Lin Mei Tao Wang Jian Zhu Yong Zhang |
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| Institution: | State Key Laboratory for Chemo/Biosensing and Chemometrics, College of Chemistry Institution, Hunan University, Changsha 410082 China.; Fujian Provincial Key Laboratory of Functional Materials and Applications, Xiamen University of Technology, Xiamen 361024 China |
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| Abstract: | High-performance lithium ion batteries are ideal energy storage devices for both grid-scale and large-scale applications. Germanium, possessing a high theoretical capacity, is a promising anode material for lithium ion batteries, but still faces poor cyclability due to huge volume changes during the lithium alloying/dealloying process. Herein, we synthesized an amorphous germanium and zinc chalcogenide (GZC) with a hierarchically porous structure via a solvothermal reaction. As an anode material in a lithium ion battery, the GZC electrode exhibits a high reversible capacity of 747 mA h g−1 after 350 cycles at a current density of 100 mA g−1 and a stable capacity of 370 mA h g−1 after 500 cycles at a current density of 1000 mA g−1 along with 92% capacity retention. All of these outstanding electrochemical properties are attributed to the hierarchically porous structure of the electrode that has a large surface area, fast ion conductivity and superior structural stability, which buffers the volumetric variation during charge/discharge processes and also makes it easier for the electrolyte to soak in, affording more electrochemically active sites.High-performance lithium ion batteries are ideal energy storage devices for both grid-scale and large-scale applications. |
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