Carbon-silicon composite negative electrode material of lithium ion battery and preparation method thereof

A technology for lithium ion batteries and negative electrode materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as instability and reduce the cycle performance of electrode materials, achieve easy operation, cycle stability, safety and pollution-free, and improve charging. Effects of Discharge Efficiency and Cycling Stability

Inactive Publication Date: 2014-03-05
GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

The single silicon particle in the carbon-silicon composite material prepared by this method has a more uniform coating carbon layer, which promotes the formation of a stable SEI film on the surface of the composite material during charge and discharge, and is conducive to solving the problem of composite materials synthesized by traditional methods. The silicon in it will be exposed in the electrolyte, and an unstable SEI film will be formed on the silicon surface, which re

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  • Carbon-silicon composite negative electrode material of lithium ion battery and preparation method thereof
  • Carbon-silicon composite negative electrode material of lithium ion battery and preparation method thereof
  • Carbon-silicon composite negative electrode material of lithium ion battery and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0048] Embodiment 1: Silicon / carbon composite negative electrode material

[0049] Preparation of silicon / carbon composite anode materials with glucose as carbon source:

[0050] Weigh 3 grams of glucose and dissolve it in 30ml of deionized water, then weigh 0.3-3g of silicon powder with a particle size of 30-100nm and disperse (ultrasonic dispersion and magnetic stirring alternately) in the above-mentioned glucose aqueous solution to prepare a uniformly mixed system; Transfer the above homogeneous system to a polytetrafluoroethylene liner bottle, pass through a protective atmosphere to exclude oxygen, put the reaction kettle into an oven / oil bath with a set temperature of 110-180°C, take it out after reacting for 4-6 hours, and cool to room temperature , to obtain the hydrothermal product; the product obtained by hydrothermal carbonization was subjected to suction filtration, and distilled water and absolute ethanol were used as washing solvents in turn, and the precipitate o...

Embodiment 2

[0054] Example 2: Sulfur-doped silicon / carbon composite negative electrode material

[0055] Using 3,4-ethylenedioxythiophene as the sulfur source, p-toluenesulfonic acid as the dispersion medium, and glucose as the carbon source, the sulfur-doped silicon / carbon composite anode material was prepared:

[0056] Dissolve 0.58g p-toluenesulfonic acid in 30ml deionized water to obtain transparent liquid A, then weigh 0.1~0.3g 3,4-ethylenedioxythiophene dropwise into A, stir for 2 hours to obtain transparent and uniform solution B, weigh Dissolve 1 g of glucose in solution B, stir for 2 hours, weigh the catalyst ammonium persulfate (0.5 g) / ferric sulfate (2 mg) and add it into solution B and continue stirring to obtain a clear and transparent solution C; then weigh 0.3 g of particle size 30-100nm silicon powder, disperse (ultrasonic dispersion and magnetic stirring alternately) in solution C to prepare a uniformly mixed system D; transfer the above-mentioned uniform system D to a po...

Embodiment 3

[0060] Embodiment 3: silicon / porous carbon composite negative electrode material

[0061] Using F127 as a soft template / pore-forming agent and glucose as a carbon source to prepare silicon / porous carbon composite anode materials:

[0062] Weigh 0.28g of F127, dissolve it in 20ml of deionized water and stir overnight to obtain transparent liquid A, weigh 2.8-8.4g (at this time, the mass ratio of the soft template / pore-forming agent to the carbon source is 1:10-1:30 ) Glucose was dissolved in 10ml of deionized water and stirred to obtain a transparent solution B, solution B was dropped into solution A and stirred for 1 hour to obtain a transparent solution C, and then 0.3g of silicon powder with a particle size of 30-100nm was weighed and ultrasonically dispersed in solution C to prepare A uniformly mixed system D was obtained; transfer the above homogeneous system D to a polytetrafluoroethylene liner bottle, pass through a protective atmosphere to exclude oxygen, put the reacti...

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Abstract

The invention discloses a carbon-silicon composite negative electrode material of a lithium ion battery and a preparation method of the carbon-silicon composite negative electrode material. The negative electrode material is prepared by coating the surface of a single silicon particle with a uniform carbon-cladding layer, an impurity-element-doped carbon-cladding layer or a porous carbon-cladding layer. By adopting a hydrothermal method and subsequent calcining method, environmental friendliness can be achieved, the procedure is simple and easiness in operation can be realized; the silicon and a resilient carbon carrier form a composite material, the electrochemical performance of the silicon material can be improved through the complementary advantages under the synergistic effect of carbon and silicon components, and the primary charging-discharging efficiency and the cycling stability can be improved. The prepared silicon-carbon composite negative electrode material of the lithium ion battery has the advantages of high specific capacity, good cycling stability, safety, no pollution and the like, and an effective way is provided for the research of a high-capacity lithium ion battery.

Description

Technical field: [0001] The invention relates to the field of lithium-ion batteries, in particular to a carbon-silicon composite negative electrode material for lithium-ion batteries and a preparation method thereof. Background technique: [0002] With the depletion of fossil energy and the deterioration of the earth's climate, the development of new clean energy and the strengthening of energy conservation and emission reduction have become the key development directions of countries all over the world. In recent years, with the accelerated construction of hybrid vehicles, pure electric vehicles and new energy (solar, wind power) grid-connected power station projects, high-performance power (energy storage) batteries have become one of the core technologies for vigorous development. Currently, lithium-ion batteries are due to Its advantages such as high voltage, large capacity, good cycle performance and low pollution have become the most competitive power solution. The de...

Claims

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Application Information

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IPC IPC(8): H01M4/38H01M4/62
CPCH01M4/366H01M4/625H01M10/0525Y02E60/10
Inventor 张灵志邵丹唐道平
Owner GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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