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Negative electrode material for non-aqueous electrolyte secondary battery and preparation method thereof

A non-aqueous electrolyte and negative electrode material technology, which is applied in the direction of secondary batteries, battery electrodes, negative electrodes, etc., can solve the problems of unstable solid electrolyte interface film and large expansion effect of silicon-based negative electrode materials, and achieve controllable size and improved Conductive ion conduction performance, the effect of improving the interface bonding strength

Pending Publication Date: 2022-02-18
LANXI ZHIDE ADVANCED MATERIALS CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In view of the above problems, the present invention provides a negative electrode material for non-aqueous electrolyte secondary batteries to solve the problems of large expansion effect of silicon-based negative electrode materials and unstable solid electrolyte interface (SEI) film in the prior art, thereby improving the stability of the material. Cycle, rate performance

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  • Negative electrode material for non-aqueous electrolyte secondary battery and preparation method thereof
  • Negative electrode material for non-aqueous electrolyte secondary battery and preparation method thereof

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preparation example Construction

[0027] Next, the preparation method of the negative electrode material is described, and the negative electrode material is prepared as follows:

[0028] S1: Evenly disperse the binder, carbon nanomaterials, silicon-based materials, and fast ion conductor materials in a solvent to make a slurry;

[0029] S2: Spray granulating the above slurry to obtain a secondary particle green body in which the silicon particles are connected and isolated by the carbon nanomaterial coated with the fast ion conductor layer;

[0030] S3: sintering the product of step S2 under a protective atmosphere, and then performing vapor phase infiltration deposition to obtain porous secondary particles reinforced by pyrolytic carbon;

[0031] S4: Surface coating the product of step S3 to obtain the negative electrode material.

[0032] In a preferred embodiment, the mass percentages of the substances in the slurry are: 0.5-3% of the binder, 1-10% of the carbon nanomaterial, 80%-90% of the silicon-based ...

Embodiment 1

[0040] Disperse 60g of carbon nanotubes in water with a solid content of 2%, add 230g of 10% HF aqueous solution and 290g of 10% LiOH aqueous solution, and disperse and coat LiF on the surface of carbon nanotubes; after fully stirring, Then add 1kg of SiO powder (tested by the above method that the expansion rate of SiO in a fully charged state is 135%), and finally add 20g of phenolic resin and stir evenly to make a slurry with a solid content of about 25%.

[0041] The spray granulation equipment is used for granulation, the air inlet temperature is 250 degrees, and the outlet air temperature is 90 degrees to obtain the granulated secondary particle body.

[0042] The granulated secondary particle green body was sintered at 900°C, and the heating rate was 5°C / min. After sintering, 6L / min of hydrogen-nitrogen mixed gas and 0.6L / min of acetylene were continued to be introduced, and the gas was deposited at 900°C for 3 hours to make the gas Pyrolytic carbon is generated in the ...

Embodiment 2

[0047] The other steps are the same as in Example 1, the difference is that the SiO in Example 1 is replaced by Li-doped SiO powder, the measured expansion rate of the Li-doped SiO powder in a fully charged state is 105%, and the spray granulation is adjusted Temperature and spray rate, the porosity of the secondary particles was measured to be 58%.

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Abstract

The present invention relates to a negative electrode material for a non-aqueous electrolyte secondary battery and a method for preparing the same, the negative electrode material comprises porous secondary particles and pore sealing layers on the surfaces of the secondary particles, the secondary particles are formed by aggregating primary particles of a silicon-based material, the negative electrode material is characterized in that the primary particles are loaded on a three-dimensional network body, and the primary particles are connected through the three-dimensional network body; and the three-dimensional network body is formed by a carbon nanomaterial of which the surface is coated with a fast ion conductor. The negative electrode material provided by the invention shows extremely low expansion rate and relatively high conductivity and ion conductivity, and when the negative electrode material is used for a secondary battery, the battery has excellent rate capability and cycle performance. The preparation method is simple and easy to implement, low in cost and suitable for large-scale production.

Description

technical field [0001] The invention relates to the field of lithium ion battery materials, in particular to a negative electrode material for a nonaqueous electrolyte secondary battery and a preparation method thereof. Background technique [0002] In recent years, silicon-based anode materials have become the focus of research on the anode of the next generation of lithium-ion batteries due to their high specific capacity, but there are still the following key problems in order to achieve large-scale applications: The resulting particle breakage and pulverization and the destruction of the electrode structure lead to the failure of electrochemical performance; ②Due to the continuous destruction and reorganization of the SEI film caused by expansion and contraction, the continuous consumption of electrolyte and reversible lithium source leads to accelerated electrode capacity decay and a sharp drop in charge and discharge efficiency. Contents of the invention [0003] In ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/48H01M4/62H01M10/0525
CPCH01M4/366H01M4/483H01M4/386H01M4/624H01M4/625H01M4/628H01M10/0525H01M2004/021H01M2004/027H01M4/48H01M4/36H01M4/38H01M4/62Y02E60/10
Inventor 刘江平陈青华姚林林房冰其他发明人请求不公开姓名
Owner LANXI ZHIDE ADVANCED MATERIALS CO LTD
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