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A preparation method of a multiple modified silicon-manganese alloy composite negative electrode material

A silicon-manganese alloy and negative electrode material technology, applied in the direction of battery electrodes, structural parts, electrical components, etc., can solve the problems of failing to meet the energy density requirements of lithium-ion batteries, failing to meet actual use requirements, and reducing battery life. Improve the first charge and discharge efficiency and cycle stability, improve cycle stability, and reduce cost

Active Publication Date: 2021-01-15
珠海格力绿色再生资源有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] The field of new energy vehicle power batteries has high requirements on the energy density and service life of lithium-ion batteries. The theoretical specific capacity of traditional graphite anode materials is only 372mAh / g, which is far from meeting the increasing energy density requirements of lithium-ion batteries.
Silicon has a high theoretical capacity (4200mAh / g) and is regarded as the most promising new negative electrode material, but its huge volume expansion effect during charging and discharging will make its capacity rapidly decay and reduce the battery life. production application
[0003] The current silicon-based anode materials generally have problems such as low initial charge and discharge efficiency, large volume expansion, slow initial efficiency improvement, and rapid capacity decay. Many existing modification methods use carbon coating to form a core-shell structure to buffer volume changes. , but although the effect is improved only by carbon coating, it is far from meeting the actual use requirements, and the electrochemical performance needs to be further improved

Method used

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  • A preparation method of a multiple modified silicon-manganese alloy composite negative electrode material
  • A preparation method of a multiple modified silicon-manganese alloy composite negative electrode material

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Embodiment 1

[0026] A method for preparing a multiple-modified silicon-manganese alloy composite negative electrode material in this embodiment comprises the following steps:

[0027] (1) Put 56g of silicon powder, the average particle size of silicon powder is 11μm, 14g of manganese powder, the average particle size of manganese powder is 6μm, put them into a high-energy ball mill, add 150ml of absolute ethanol as the ball milling medium, and the ball-to-material ratio is 10:1 , with 2000r / min ball milling for 10h to obtain silicon-manganese alloy;

[0028] (2) adding 1000ml of deionized water to dilute the silicomanganese alloy and then drying and granulating it with a spray dryer, the inlet temperature of the spray drying is 300°C, and the outlet temperature is 150°C to obtain the silicomanganese alloy powder;

[0029] (3) Put the silicon-manganese alloy powder into the tube furnace, feed the mixed gas of argon and oxygen, wherein the mass fraction of argon is 95%, and the mass fraction...

Embodiment 14

[0035] A method for preparing a multiple-modified silicon-manganese alloy composite negative electrode material in this embodiment comprises the following steps:

[0036] (1) Put 42g of silicon powder with an average particle size of 8μm, 14g of manganese powder with an average particle size of 4μm into a high-energy ball mill, add 122ml of absolute ethanol as a ball milling medium, and the ball-to-material ratio is 10:1 , with 2000r / min ball milling for 10h to obtain silicon-manganese alloy;

[0037] (2) adding 1000ml of deionized water to dilute the silicomanganese alloy and then drying and granulating it with a spray dryer, the inlet temperature of the spray drying is 280°C, and the outlet temperature is 130°C to obtain the silicomanganese alloy powder;

[0038] (3) Put the silicon-manganese alloy powder into the tube furnace, feed the mixed gas of argon and oxygen, wherein the mass fraction of argon is 94.5%, and the mass fraction of oxygen is 5.5%, with a heating rate of ...

Embodiment 15

[0041] A method for preparing a multiple-modified silicon-manganese alloy composite negative electrode material in this embodiment comprises the following steps:

[0042] (1) Put 70g of silicon powder, the average particle size of silicon powder is 14 μm, 14g of manganese powder, the average particle size of manganese powder is 8 μm, put them into the high-energy ball mill, add 178.5ml of absolute ethanol as the ball milling medium, and the ball-to-material ratio is 10: 1. Ball mill at 2000r / min for 10h to obtain silicon-manganese alloy;

[0043] (2) adding 1000ml of deionized water to dilute the silicomanganese alloy and then drying and granulating it with a spray dryer, the inlet temperature of the spray drying is 320°C, and the outlet temperature is 170°C to obtain the silicomanganese alloy powder;

[0044] (3) Put the silicon-manganese alloy powder into the tube furnace, feed the mixed gas of argon and oxygen, wherein the mass of argon is 95.45%, the mass of oxygen is 4.55...

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Abstract

The invention relates to a preparation method of a multi-modified silicon-manganese alloy composite negative electrode material, which comprises the following steps: mixing silicon powder, manganese powder and a ball milling medium, and carrying out ball milling to obtain a silicon-manganese alloy; adding deionized water into the silicon-manganese alloy to dilute, drying and granulating to obtainsilicon-manganese alloy powder; carrying out crystallization treatment on the silicon-manganese alloy powder, introducing a mixed gas of argon and oxygen, heating, carrying out heat preservation treatment, and cooling to room temperature; and adding asphalt and a conductive agent into the cooled silicon-manganese alloy powder, fully and uniformly mixing to obtain a precursor of the silicon-manganese alloy composite negative electrode material, and pyrolyzing the precursor in an argon atmosphere to obtain the multi-modified silicon-manganese alloy composite negative electrode material. The negative electrode material prepared by the method has excellent initial discharge specific capacity, initial charge-discharge efficiency and cycling stability, and the preparation method is simple, shortin preparation period, low in raw material cost and suitable for large-scale industrial production.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a preparation method of a multiple-modified silicon-manganese alloy composite negative electrode material. Background technique [0002] The field of new energy vehicle power batteries has high requirements on the energy density and service life of lithium-ion batteries. The theoretical specific capacity of traditional graphite anode materials is only 372mAh / g, which is far from meeting the increasing energy density requirements of lithium-ion batteries. Silicon has a high theoretical capacity (4200mAh / g) and is regarded as the most promising new negative electrode material, but its huge volume expansion effect during charging and discharging will make its capacity rapidly decay and reduce the battery life. production application. [0003] The current silicon-based anode materials generally have problems such as low initial charge and discharge efficien...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525
CPCH01M4/366H01M4/386H01M4/62H01M4/625H01M10/0525Y02E60/10
Inventor 程成蒋沅峰石雄飞杨得棚王琳陈龙
Owner 珠海格力绿色再生资源有限公司
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