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A kind of silicon carbon negative electrode material of lithium ion secondary battery and preparation method thereof

A secondary battery and negative electrode material technology, applied in the direction of secondary batteries, battery electrodes, circuits, etc., can solve the problems of low delithiation potential platform, poor battery cycle performance, and influence on wide application, and achieve volume expansion, cycle Improve performance and realize the effect of industrial production

Active Publication Date: 2022-02-01
SHANGHAI SHANSHAN TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its capacity can reach 4200mAh / g, and the delithiation potential platform is low, but its volume expansion is large during charging and discharging, resulting in poor battery cycle performance and affecting its wide application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) Weigh 0.15Kg of silicon and 2.85kg of phenol oil, and add them successively to the ultra-fine circulating ball milling equipment, and circulate ball milling for 15 hours to obtain a nano-slurry, and detect that the average particle diameter of its solid particles is 100-300nm;

[0023] (2) Weighing 2Kg of coal tar pitch with a softening point of 110°C, mixing it with the above-mentioned nano-slurry, and heating up to 430°C, the reaction time was 8 hours to obtain a pitch mixture;

[0024] (3) Coking the pitch mixture obtained above at 550° C. for 6.5 hours under nitrogen protection to obtain block pitch coke,

[0025] (4) Pulverizing and classifying the massive pitch coke through a pulverizer to prepare pitch coke powder with an average particle size of D50=20.0 μm;

[0026] (5) Carbonize the pitch coke powder, which is the precursor of the negative electrode material of lithium-ion batteries. During the carbonization process, nitrogen is used for protection. The ca...

Embodiment 2

[0029] (1) Weigh 0.25Kg of silicon oxide and 1.25kg of washing oil, add them to ultra-fine circulating ball milling equipment in turn, and circulate ball milling for 15 hours to obtain nano-slurry. The average particle diameter of the solid particles in the obtained nano-slurry is 100-300nm;

[0030] (2) Weigh 2Kg of coal tar pitch with a softening point of 110° C., mix it with the above-mentioned nano-slurry, and heat up to 435° C., and the reaction time is 6 hours to obtain a polymerized pitch mixture;

[0031] (3) Coking the polymerized pitch mixture obtained above at 500° C. for 8 hours under the protection of an inert gas to obtain massive pitch coke;

[0032] (4) Pulverize and classify the above-mentioned massive pitch coke through a pulverizer to prepare pitch coke powder with an average particle size of D50=10.0 μm;

[0033] (5) Carbonize the pitch coke powder used as the precursor of the lithium-ion battery negative electrode material. During the carbonization proces...

Embodiment 3

[0036] (1) Weigh the silicon of 0.15Kg and the silicon oxide of 0.10kg, the anthracene oil of 1.25kg, add successively in the ultra-fine circulating ball milling equipment, circulate ball milling 15 hours to get nano-slurry, detect the density of solid particles in the nano-slurry The average particle size is 100-300nm;

[0037] (2) Weigh 2Kg of coal tar pitch with a softening point of 110°C, mix it with the above-mentioned nano-slurry, heat up to 450°C, and conduct a thermal polymerization reaction for 1 hour to obtain a polymerized pitch mixture;

[0038] (3) Coking the above-mentioned polymerized pitch mixture at 600° C. for 5 hours under the protection of an inert gas to obtain massive pitch coke;

[0039] (4) The block pitch coke is pulverized and classified by a pulverizer to prepare a pitch coke powder with an average particle size of D50=30.0 μm;

[0040] (5) Carbonize the pitch coke powder, which is the precursor of the negative electrode material of the lithium-ion ...

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Abstract

The present invention relates to the technical field of lithium-ion battery anode materials, in particular to a silicon-carbon anode material for lithium-ion secondary batteries and a preparation method thereof, which is characterized in that it is prepared by using the following raw materials in weight percentage: silicon and / or suboxide Silicon: 3-10wt%; solvent: 30-57wt%; coal tar pitch: 40-60wt%; the solvent is at least one of phenol oil, washing oil and anthracene oil. Compared with the prior art, the present invention introduces nano-silicon and / or silicon oxide into the carbon material, which increases the gram capacity of the negative electrode material of the lithium-ion secondary battery, thereby increasing the charge-discharge gram capacity of the battery; The external carbon package restrains the expansion of silicon and / or silicon oxide, which better solves the problem of volume expansion, thus improving the cycle performance; in addition, the process flow of the present invention is simple and easy to control, and the equipment used is industrial common equipment. It is easy to realize industrialized production.

Description

technical field [0001] The invention relates to the technical field of negative electrode materials for lithium ion batteries, in particular to a silicon carbon negative electrode material for lithium ion secondary batteries and a preparation method thereof. Background technique [0002] With the miniaturization and increasingly superior performance of electronic equipment such as various mobile phones, notebook computers, digital cameras and portable appliances. Lithium-ion batteries are also attractive because of their excellent performance in terms of high energy density, high working voltage, small size, light weight, no pollution, fast charging and discharging, and long cycle life. [0003] At present, graphite is widely used as the negative electrode material in commercialized lithium-ion secondary batteries. In theory, the reversible lithium storage capacity of graphite can reach 372mAh / g, but it still cannot meet the needs of high energy density batteries. In order t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M10/0525
CPCH01M4/364H01M10/0525Y02E60/10
Inventor 李念民沈龙马飞董爱想刘梦阳李在峰朱从连
Owner SHANGHAI SHANSHAN TECH CO LTD
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