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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  • Abstract
  • Description
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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

Method used

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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

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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 ...

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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.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, and in particular relates to a lithium ion battery, in particular to a negative electrode for an all-solid thin film lithium ion battery and a preparation method thereof. Background technique [0002] Lithium-ion batteries are important power sources for laptop computers, cameras, cell phones, and other communications equipment, and have the potential to be used in cars and other vehicles as green energy. Existing lithium-ion batteries are mainly composed of carbon-based negative electrode materials, organic liquid electrolytes and lithium-containing transition metal oxide cathode materials. Among them, the all-solid-state thin-film lithium-ion battery has become the most ideal energy source due to its high safety and long cycle life. However, the commonly used negative electrode films such as lithium alloys, due to the strong volume change during intercalation and extraction of lithium...

Claims

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Application Information

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IPC IPC(8): H01M4/136H01M4/1397H01M4/58
CPCY02E60/10
Inventor 崔艳华汪小琳傅正文
Owner INST OF ELECTRONICS ENG CHINA ACAD OF ENG PHYSICS
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