Silicon-carbon negative electrode material for lithium ion secondary batteries and preparation method thereof

A secondary battery and negative electrode material technology, which is applied in secondary batteries, battery electrodes, circuits, etc., can solve the problems of low delithiation potential platform, poor battery cycle performance, and influence on wide application, so as to solve the problem of volume expansion, cycle Improve performance and realize the effect of industrialized production

Active Publication Date: 2017-11-03
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 invention relates to the technical field of negative materials for lithium ion batteries, and specifically relates to a silicon-carbon negative electrode material for lithium ion secondary batteries and a preparation method thereof. The silicon-carbon negative electrode material is prepared from the following raw materials in percentages by weight: 3wt% to 10wt% of silicon and / or silicon dioxide, 30wt% to 57wt% of a solvent and 40wt% to 60wt% of coal tar pitch, wherein the solvent is at least one of carbolic oil, scrubbing oil and anthracene oil. Compared with the prior art, nanometer silicon and / or nanometer silicon dioxide are / is added into carbon material, and the gram volume of the negative electrode material for lithium ion secondary batteries is improved, so that the charging and discharging gram volume of the battery is increased; simultaneously, nanometer silicon and / or nanometer silicon dioxide particles are wrapped by external carbon, expansion of silicon and / or silicon dioxide is restricted, and the problem of volume expansion is preferably solved, so that the cycle performance is improved; the technological process is simple and easy to control, the used equipment is industrial common equipment respectively, and industrial production is easy to realize.

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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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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