Large-capacity lithium ion battery cathode and preparation method thereof

A lithium-ion battery, high-capacity technology, applied in the field of electrochemistry, can solve the problems of decreased electrochemical cycle stability, material structure damage, electrode deformation, etc., and achieves good charge-discharge cycle reversibility, no electrode deformation, and material saving. Effect

Inactive Publication Date: 2012-02-08
INST OF ELECTRONICS ENG CHINA ACAD OF ENG PHYSICS
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AI-Extracted Technical Summary

Problems solved by technology

However, the commonly used negative electrode films such as lithium alloys, due to the strong volume change during intercalation and extraction of lithium, lead...
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Abstract

The invention belongs to the technical field of electrochemistry, and specifically relates to a cathode used in an all-solid-state film lithium ion battery, and a preparation method thereof. The cathode comprises a battery substrate, and a cathode film on the surface of the substrate. The cathode film on the surface of the substrate is a cobalt phosphate film. The preparation method comprises steps that: a, metal cobalt powder and amorphous phosphorus powder are mixed according to a molar ratio of 1:1-3; the materials are well mixed and grinded; and the mixture is pressed into a target used in pulsed laser deposition; b, the target and the substrate are placed in a vacuum deposition chamber, wherein a distance between the two is 25 to 50mm, a working gas is an argon atmosphere, and the temperature of the substrate is 500 to 700 DEG C; c, laser beams from a laser are focused through a lens and conducted onto the rotary target; and particles exited by the laser beams is sputtered onto the substrate. According to the invention, the cobalt phosphate film has good electrochemical property and good chemical stability. As a cathode film of a high-performance lithium ion battery, the film provides good charge/discharge circulation reversibility. The preparation method is simple and material saving.

Application Domain

Technology Topic

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  • Large-capacity lithium ion battery cathode and preparation method thereof
  • Large-capacity lithium ion battery cathode and preparation method thereof
  • Large-capacity lithium ion battery cathode and preparation method thereof

Examples

  • Experimental program(1)
  • Effect test(1)

Example Embodiment

[0016] Example: A lithium ion battery negative electrode, including an electrode substrate, a negative electrode film on the surface of the substrate, and the negative electrode film on the surface of the substrate is cobalt phosphide (CoP 3 ) Film, the substrate is a stainless steel sheet, and the thickness of the cobalt phosphide film is 0.2-1 μm.
[0017] The preparation method is:
[0018] a. Mix the metal cobalt powder and the red phosphorous powder, the mixing ratio is 1:2 (molar ratio) of the metal cobalt to the red phosphorous powder, mix and grind uniformly, and press the tablet into a target for pulse laser deposition;
[0019] b. Put the target and the substrate into the vacuum deposition chamber, the distance between the target and the substrate is 25-50mm, the working gas is an argon atmosphere, and the substrate temperature is 500-700℃;
[0020] c. The 1064nm fundamental frequency generated by the neodymium-doped yttrium aluminum garnet laser is tripled to obtain a 355nm pulsed laser. The laser beam is focused by a lens and incident on the target. The particles excited by the laser beam are sputtered onto the substrate. Cobalt phosphide film is deposited on the chip, and the laser beam energy density is 2~4J·cm -2 , The deposition time is 1 hour.
[0021] In this example, transmission electron microscopy combined with selected area electron diffraction (TEM&SAED) measurement shows that: figure 1 Clearer lattice fringes can be observed in (a), figure 1 There is a group of diffraction rings in (b), which can be assigned to CoP respectively 3 (013), (321) and (422) crystal planes (JCPDS card no.73-1239), indicating that the obtained cobalt phosphide has a body-centered cubic structure. The results show that under high temperature deposition conditions, by controlling the laser power, air pressure and other parameters, it is possible to obtain nano-CoP by using a mixed target of simple substance. 3 film. And existing related CoP 3 Comparing the synthesis methods of complex materials, the physical deposition method saves time and effort, and at the same time, there is no need to add a conductive agent in the electrode preparation process, which saves process steps and other additives that may have adverse effects on the material.
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PUM

PropertyMeasurementUnit
Thickness0.2 ~ 1.0µm
tensileMPa
Particle sizePa
strength10

Description & Claims & Application Information

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Owner:江苏海能动力科技有限公司
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