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

Inactive Publication Date: 2016-03-09
CHINA THREE GORGES UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, its cycle stability is poor
The main problem is that its conductivity is poor, and the morphology and structure of the material will be destroyed during the cycle, resulting in unsatisfactory electrochemical performance.
Based on the above background, this patent invented a NiO / C-Ni composite structure combined with in-situ growth and carbon composite method, which shows high specific capacity and excellent cycle stability as the negative electrode of lithium ion battery. see the report

Method used

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  • Binder-free lithium ion battery negative electrode material and preparation method therefor
  • Binder-free lithium ion battery negative electrode material and preparation method therefor
  • Binder-free lithium ion battery negative electrode material and preparation method therefor

Examples

Experimental program
Comparison scheme
Effect test

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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PUM

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Abstract

The invention provides a binder-free NiO / C-Ni lithium ion battery negative electrode material and a preparation method therefor. NiO / C uniformly grows on the surface of foamed nickel. The specific preparation process comprises: uniformly mixing de-ionized water with hydrogen peroxide, and fully stirring to obtain a uniform solution; transferring the uniform solution to a liner of a hydrothermal reaction kettle, putting multiple pieces of the foamed nickel into the liner of the hydrothermal reaction kettle, performing a hydrothermal reaction at the temperature of 90-150 DEG C for 12-24 hours, then naturally cooling, taking out the foamed nickel, and completely washing the foamed nickel with the de-ionized water; and putting the foamed nickel into a citrate-glucose solution or a sucrose solution, standing for 5-10 hours, taking out a product, drying the product in a drying oven at the temperature of 70 DEG C, finally sintering the product in an N2 atmosphere at the temperature of 300-400 DEG C for 5 hours, and naturally cooling to obtain an NiO / C-Ni composite structure. The electrode preparation method is simple, low in cost and high in controllability; the NiO / C in the prepared NiO / C-Ni uniformly grows on the surface of the foamed nickel and is in good contact with the foamed nickel; and the prepared NiO / C-Ni electrode is relatively high in charging / discharging capacity and excellent in cycle performance.

Description

technical field [0001] The invention relates to a lithium ion battery negative electrode material, in particular to a preparation process of a NiO / C-Ni lithium ion battery negative electrode material, and belongs to the field of electrochemical power sources. technical background [0002] Lithium-ion batteries have the advantages of high energy density, low price, low environmental impact, and no memory effect, and have become a very important electrochemical energy storage device. At present, lithium-ion batteries have been widely used in portable electronic devices, and are also ideal power sources for future hybrid vehicles and pure electric vehicles. This puts forward new requirements for lithium-ion batteries in terms of safety, cost, energy density, and power density. It is of great significance to develop new and high-performance lithium-ion batteries, which depends on the research and development of high-performance electrode materials. [0003] At present, the anod...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/52H01M4/583H01M4/131H01M4/133H01M4/1391H01M4/1393H01M10/0525
CPCH01M4/131H01M4/133H01M4/1391H01M4/1393H01M4/362H01M4/523H01M4/583H01M10/0525H01M2004/027H01M2220/20H01M2220/30Y02E60/10
Inventor 倪世兵张继成唐俊杨学林
Owner CHINA THREE GORGES UNIV
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