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Grid-shaped lithium ion battery anode structure device and preparation method thereof

A lithium-ion battery and grid-like technology, applied in the field of mechanical and structural stress optimization, can solve the problems of limited laboratory conditions, high cost, and inability to apply a large number of commercial applications, and achieve large volume change tolerance, low development cost, and high Effects on operability and commercial potential

Inactive Publication Date: 2019-05-07
BEIHANG UNIV
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

These solutions focus on structural design at the micro level, including: microstructure design (core-shell particles, eggshell particles, micro-lattice structures, etc.), nano-micro composite materials (surface growth carbon fibers, carbon-silicon composite nanoparticles, etc.), etc., these The solution can solve the problem of volume change to a certain extent, but the problem is that most methods are limited to laboratory conditions, cannot be applied to a large number of commercial applications, and the cost is too high

Method used

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  • Grid-shaped lithium ion battery anode structure device and preparation method thereof
  • Grid-shaped lithium ion battery anode structure device and preparation method thereof
  • Grid-shaped lithium ion battery anode structure device and preparation method thereof

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[0026] The preparation method of the negative electrode structure device is as follows: 1) selecting a negative high-capacity active material, an adhesive, a conductive agent, and a current collector; 2) preparing an active material slurry; 3) coating the surface of the current collector with a negative active material; 4) heating Curing; 5) Laser etching after special rolling or ordinary rolling.

[0027] Detailed description will be given below.

Embodiment 1

[0029] like figure 1 As shown, the anode structure of the grid-shaped lithium-ion battery with large volume change tolerance of the present invention includes a cathode current collector copper foil 1 and an anode active material layer 2 . The surface of the negative electrode active material layer 2 has square grid-like grooves 3 .

[0030] The negative electrode structure is applied to 18650 cylindrical batteries with a width of 63mm and a length of 700mm.

[0031] The preparation method of the above-mentioned negative electrode structure comprises the following steps:

[0032] (1) Mix graphite, silicon particles, Super-P (conductive carbon black), PVDF with NMP (N,N-dimethylpyrrolidone) in a mass ratio of 74.5:23:1:1.5, and stir evenly;

[0033] (2) Coating the prepared negative electrode active material slurry on the negative electrode current collector copper foil 1, and heating at 100°C for 5 minutes to solidify to form the active material layer 2;

[0034] (3) Put t...

Embodiment 2

[0037] like figure 2 As shown, the anode structure of the grid-like lithium-ion battery with a large volume change tolerance of the present invention includes an anode current collector copper foil 1 and two layers of anode active material layers 2 . The surfaces of the two negative electrode active material layers 2 have square grid-shaped grooves 3 .

[0038] The negative electrode structure is applied to 18650 cylindrical batteries with a width of 63mm and a length of 700mm.

[0039] The preparation method of the above-mentioned negative electrode structure comprises the following steps:

[0040] (1) Mix graphite, silicon particles, carbon powder, and hydroxymethylcellulose binder according to the mass ratio of 70:28:1:1, and stir evenly;

[0041] (2) Coating the prepared negative electrode active material slurry on both surfaces of the negative electrode current collector copper foil 1, and heating at 100° C. for 5 minutes to solidify to form the active material layer 2...

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Abstract

The invention discloses a grid-shaped lithium ion battery anode structure device and a preparation method thereof for a silicon-containing anode lithium battery which generates a large volume change in a charge and discharge cycle. The surface of the anode has a simple grid-shaped crisscrossed groove. The structure device is simple in structure and is easy to prepare. The grid-shaped structure provides a space for the change in the volume of the anode, and reduces the stress generated by the deformation, thereby reducing the risk of failure of the anode. The anode structure, while ensuring a large increase in the capacity of the anode, can accommodate a large volume change, thereby prolonging the service life of the high-capacity lithium battery.

Description

technical field [0001] The invention relates to a grid-shaped lithium-ion battery negative electrode structure device, which belongs to the field of electrochemistry and relates to the fields of mechanics and structural stress optimization. Background technique [0002] Lithium-ion batteries are more and more widely used in various fields such as aerospace, automobiles, and mobile electronic devices because of their excellent electrochemical properties such as high voltage, good safety performance, and long cycle life, as well as environmental protection characteristics. At present, the active material mainly used in the negative electrode of lithium-ion batteries is graphite, and its theoretical capacity is 372mAh / g. With the development of lithium-ion batteries, high-capacity fast-charge batteries have become an urgent demand in the market and a hot spot in research and development. Materials such as silicon, germanium, and tin have been proved to have quite high capacity...

Claims

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Application Information

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IPC IPC(8): H01M4/134H01M4/1395H01M4/04
CPCY02E60/10
Inventor 许骏高翔袁春浩王璐冰刘冰河
Owner BEIHANG UNIV
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