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New Nano Superporous Structure Ni/Porous-Ni/V2O5 High Performance Lithium Storage Electrode

- Dec 11, 2018 -


Recently, the department of mechanical engineering and the department of material science and engineering at Texas A&M University Dr. Professor Hong Liang (corresponding author) has designed and successfully prepared a Porous nickel/Porous matrix nickel/vanadium pentaoxide nano-sheet (Ni/Porous -ni/V2O5) composite material with an innovative 3d supergraded structure. When it is directly used in lithium battery cathode material, it shows excellent electrochemical charge-discharge cycle performance, and this new type of electrode material does not need any organic adhesive, which greatly improves the electrochemical performance and optimizes the battery assembly process. Finally, the authors use a series of analysis methods to the mechanism analysis, the results show that the excellent properties of this new type of electrode materials mainly from three aspects of synergy: fluid is a new type nickel hole-arrays set, the second is a vanadium pentoxide nanometer piece and has assembled structure of micron flower, three is the innovative adhesive technology preparation of electrodes. These advantages are combined to improve the electrochemical energy output and cycling stability of electrode materials. Relevant results recently to titled "Superhierarchical Nickel - Vanadia Nanocomposites for Lithium Storage" published in the journal of the American chemical society's international well-known ACS Applied Energy, Materials, team doctor Yuan make for the first author.

1

XRD crystallographic characterization of Ni/Porous-Ni/V2O5 composites

2

Sem images of Ni/Porous-Ni/V2O5 composite material and its control group Ni/V2O5

(a) low-magnification sem images of Ni/Porous-Ni/V2O5 after annealing;

(b) low-magnification sem images of Ni/Porous-Ni/V2O5 before annealing;

(c) high-magnification sem images of Ni/Porous-Ni/V2O5 after annealing;

(d) low-magnification sem images of Ni/V2O5 control samples before annealing.

3

Electrochemical characterization results of Ni/Porous-Ni/V2O5 composite material and its control group Ni/V2O5 as the positive electrode of lithium battery

(a) Ni/Porous-Ni/V2O5 is 0. C charge-discharge performance curve during 100 low-speed cycles;

(b) Ni/V2O5 is 0. C charge-discharge performance curve during 100 low-speed cycles;

(c) Ni/Porous-Ni/V2O5 has been 0, compared to that of the control group. 2. Comparison of specific capacity and coulombic efficiency changes at a low speed of 100 cycles of C;

(d) Ni/Porous-Ni/V2O5 has a potential 3 in the control group. Comparison of specific capacity and coulombic efficiency changes at a high speed of 500 cycles of 0 C.

4

Morphology comparison of Ni/Porous-Ni/V2O5 composite electrode material before and after 100 charging and discharging cycles

(a) sem images of Ni/Porous-Ni/V2O5 prior to the charge-discharge cycle;

(b) Ni/Porous-Ni/V2O5 is 0. 2 C scanning electron microscope images after 100 low-speed cycles