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A preparation method of a high-rate silicon oxide-based lithium battery negative electrode material

A technology of silicon oxide-based lithium and negative electrode materials, applied in the direction of negative electrodes, battery electrodes, active material electrodes, etc., can solve the problems of poor electronic ion conductance, etc., and achieve the effects of accelerating kinetics, stabilizing cycle performance, and buffering volume changes

Active Publication Date: 2021-01-05
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Silicon oxide-based materials have poor electronic and ion conductivities, and only improving the electronic conductance of the material has certain limitations in improving the rate performance of electrode materials.

Method used

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  • A preparation method of a high-rate silicon oxide-based lithium battery negative electrode material
  • A preparation method of a high-rate silicon oxide-based lithium battery negative electrode material
  • A preparation method of a high-rate silicon oxide-based lithium battery negative electrode material

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preparation example Construction

[0026] The embodiment of the present disclosure discloses a method for preparing a high-rate silicon oxide-based lithium battery negative electrode material. The method specifically includes the following steps:

[0027] Step 1. Preparation of silicon oxide-carbon / graphene powder:

[0028] 1.1 Take a certain amount of silicon ester and dissolve it in ethanol, then add ionized water and hydrochloric acid, and stir evenly to obtain the mixed solution A;

[0029] 1.2 Take a certain amount of sucrose, put it in the graphene oxide dispersion, stir until dissolved, and obtain the mixed solution B;

[0030] 1.3 Add ammonia water to the mixed solution A to adjust the pH value, first obtain the silicone gel, and after the reaction is completed, continue to add the mixed solution B to the silicone gel to obtain a silicon-oxygen-sucrose-graphene oxide brown gel;

[0031] 1.4 Mill the silicon-oxygen-sucrose-graphene oxide brown gel in a ball mill jar for a period of time, and then transf...

Embodiment 1

[0046] Weigh 2.5 g of tetraethyl orthosilicate and dissolve it in 4 mL of ethanol, stir for a while, then add 2 mL of deionized water and 1 mL of hydrochloric acid into it to obtain a mixed solution A. After the mixture A was vigorously stirred for 1 hour, a silica sol was obtained, and the pH of the sol was adjusted to 6.5 with 1M ammonia water, and the stirring was continued for a period of time to obtain a silica gel. Measure 70 mL of graphene oxide dispersion, graphene oxide concentration is 4 mg mL -1 , then weighed 0.6 g of sucrose and added it, and stirred until completely dissolved to obtain the mixed solution B.

[0047] Add the mixed solution B to the silicone gel, and after stirring for a period of time, a silicon-oxygen-sucrose-graphene oxide brown gel is obtained. The brown gel was transferred to a ball mill tank, the ball milling speed was 300 rpm, and the ball milling time was 3 h. The brown gel after ball milling was transferred to a freeze dryer, and the dryi...

Embodiment 2

[0052] Weigh 3 g of ethyl orthosilicate and dissolve it in 4 mL of ethanol, stir for a while, then add 2 mL of deionized water and 1 mL of hydrochloric acid into it to obtain a mixed solution A. After the mixture A was vigorously stirred for 1 hour, a silica sol was obtained, and the pH of the sol was adjusted to 6.5 with 1M ammonia water, and the stirring was continued for a period of time to obtain a silica gel. Measure 160 mL of graphene dispersion, the content of graphene oxide is 8 mg mL -1 , then weighed 2 g of sucrose and added it, stirred until completely dissolved, and obtained the mixed solution B.

[0053] Add the mixed solution B into the silicone gel, and after stirring for a period of time, a silicon-oxygen-sucrose-graphene oxide brown gel is obtained. The brown gel was transferred to a ball mill jar, the ball milling speed was 150 rpm, and the ball milling time was 7 h. The brown gel after ball milling was transferred to a freeze dryer, and the drying time was ...

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Abstract

The invention belongs to the field of new energy materials and electrochemistry, and particularly relates to a preparation method of a high-rate monox-based lithium electric anode material. Accordingto the method, a sol-gel method and a carbon thermal reduction method are adopted to prepare a monox-carbon / graphene material with electrochemical activity, then dispersed fast ion conductor lithiumsilicate is prepared on the surface of the monox-carbon material through spin wrapping and thermal treatment, and finally the monox-carbon@lithium silicate / graphene material is obtained. The fast ionconductor lithium silicate can effectively accelerate the ion transport during charging and discharging of a composite material and accelerate the reaction kinetics of an electrode. The in-situ introduction of the flexible graphene during preparation can effectively buffer the volume change caused by the lithium deintercalation of monox in a cyclic process and improve the structural stability ofthe electrode. The preparation method of the high-rate monox-based lithium electric anode material has the advantages that the designed material has higher rate characteristics and good cycle stability; the preparation process has higher controllability and can be applied to the preparation of other high-performance electrode materials.

Description

technical field [0001] The invention belongs to the fields of new energy materials and electrochemistry, and in particular relates to a preparation method of a high-rate silicon oxide-based lithium battery negative electrode material. [0002] technical background [0003] Lithium-ion batteries have the characteristics of high specific capacity, high voltage platform, and long cycle life. They are widely used in portable electronic 3C equipment, electric vehicles, ships, space technology, biomedical engineering, logistics, and national defense industries. The development of lithium-ion batteries with high energy density and high rate characteristics has always been the goal pursued by people. The negative electrode material is a key factor in determining the characteristics of lithium-ion batteries. At present, the commercial graphite anode has a specific capacity (theoretical specific capacity is 372 mAh g -1 ), rate characteristics, safety and other aspects are difficult ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/62H01M10/0525
CPCH01M4/366H01M4/48H01M4/624H01M4/625H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 赵海雷陶昕李兆麟张子佳付博扬
Owner UNIV OF SCI & TECH BEIJING
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