Binder-free lithium ion battery negative electrode material and preparation method therefor
A technology of lithium ion battery and negative electrode material, applied in the field of electrochemical power supply
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Embodiment 1
[0017] Take a certain amount of deionized water and hydrogen peroxide, mix them evenly, stir them well, transfer the evenly stirred solution to the liner of the hydrothermal reaction kettle, put a few pieces of foamed nickel into it, and react it at 120°C for 24 hours, naturally After cooling, the nickel foam was taken out and cleaned with deionized water. Put the cleaned nickel foam into a citric acid solution with a concentration of 0.002g / ml, let it stand for 5-10 hours, take it out and dry it in an oven at 70°C. Then the dried nickel foam was placed in a tube furnace under N 2 The NiO / C-Ni composite structure was obtained after sintering at 350°C for 5h in the atmosphere and cooling naturally. The prepared samples were analyzed by XRD and Raman, figure 1 (a) The diffraction peaks of the XRD pattern in (a) correspond to NiO (XRD card JCPDS, No.47-1049) and Ni (04-0850); figure 1 (b) In the Raman spectrum, the Raman peaks correspond to NiO(○) and C(△). XRD and Raman re...
Embodiment 2
[0019] Take a certain amount of deionized water and hydrogen peroxide, mix them evenly, stir them well, transfer the evenly stirred solution to the liner of the hydrothermal reaction kettle, put a few pieces of foamed nickel into it, and react it at 120°C for 24 hours, naturally After cooling, the nickel foam was taken out and cleaned with deionized water. Put the cleaned nickel foam into the glucose solution with a concentration of 0.002g / ml, let it stand for 5~10h, take it out and place it in an oven at 70°C for drying. Then the dried nickel foam was placed in a tube furnace under N 2 The NiO / C-Ni composite structure was obtained after sintering at 350°C for 5h in the atmosphere and cooling naturally. With the prepared NiO / C-Ni as the negative electrode, a button battery was prepared according to the steps in Example 1 and its electrochemical performance was analyzed. Such as Figure 4 As shown, the first charge and discharge capacities of the NiO / C-Ni negative electrode ...
Embodiment 3
[0021] Take a certain amount of deionized water and hydrogen peroxide, mix them evenly, stir them well, transfer the evenly stirred solution to the liner of the hydrothermal reaction kettle, put a few pieces of foamed nickel into it, and react it at 120°C for 24 hours, naturally After cooling, the nickel foam was taken out and cleaned with deionized water. Put the cleaned nickel foam into a sucrose solution with a concentration of 0.002g / ml, let it stand for 5-10 hours, take it out and dry it in an oven at 70°C. Then the dried nickel foam was placed in a tube furnace under N 2 The NiO / C-Ni composite structure was obtained after sintering at 400°C for 5h in the atmosphere and cooling naturally. With the prepared NiO / C-Ni as the negative electrode, a button battery was prepared according to the steps in Example 1 and its electrochemical performance was analyzed. Such as Figure 5 As shown, the NiO / C-Ni prepared in Example 3 is used as the lithium ion battery negative electrod...
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