Preparation method of silicon-silver composite anode material of lithium ion battery and reaction kettle

A technology for lithium ion batteries and negative electrode materials, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of low electrical conductivity, complicated manufacturing process, and powdered electrical conductivity of silicon negative electrode materials, so as to suppress volume expansion and improve reversibility. capacity, the effect of improving cycle performance

Inactive Publication Date: 2012-10-03
TSINGHUA UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, silicon has low electrical conductivity and exhibits a volume expansion of up to 300% during charge and discharge
This leads to the pulverization of the particles, and then they are separated from the conductive agent and peeled off from the current collector, which reduces the cycle performance of Si-based anode materials, thus restricting the commercial application of Si-based anode materials.
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Method used

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  • Preparation method of silicon-silver composite anode material of lithium ion battery and reaction kettle
  • Preparation method of silicon-silver composite anode material of lithium ion battery and reaction kettle
  • Preparation method of silicon-silver composite anode material of lithium ion battery and reaction kettle

Examples

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Embodiment 1

[0033] A method for preparing a silicon-silver composite negative electrode material for a lithium-ion battery, the specific steps of which are as follows:

[0034] (1) Pretreatment: Take 1 g of silicon powder particles with a particle size of 80 nm, add them to the acetone solution, wash for 20 minutes, and filter with suction, then add 50 ml of 0.1 mol / L NaOH solution, stir for 1 hour, and pump Filter and wash until the solution is neutral;

[0035] (2) Weigh 1 g AgNO 3 , dissolved in ammonia water with a concentration of 1 mol / L, and magnetically stirred until the solution was clear;

[0036] (3) Take 6 g of glucose solution, add 0.6 g of tartaric acid, 12.5 ml of absolute ethanol, add water and mix to prepare 125 ml of reducing solution;

[0037] (4) Prepare 1 L of mother liquor with a concentration of 1 mol / L in distilled water and ammonia water, control the temperature of the reactor at 10 °C, add silicon powder particles into the mother liquor, adjust the mechanical s...

Embodiment 2

[0045] A method for preparing a silicon-silver composite negative electrode material for a lithium-ion battery, the specific steps of which are as follows:

[0046] (1) Pretreatment: Take 1 g of silicon powder particles with a particle size of 300 nm, add them to the acetone solution, wash for 40 minutes, and filter with suction, then add 100 ml of 0.2 mol / L HF solution, stir for 1 hour, and pump Filter and wash until the solution is neutral;

[0047] (2) Weigh 1 g AgNO 3 , dissolved in ammonia water with a concentration of 2 mol / L, stirred with a magnetic force until the solution is clear;

[0048] (3) Take 10 g of glucose solution, add 1 g of tartaric acid, 20 ml of absolute ethanol, add water and mix to prepare 200 ml of reducing solution;

[0049] (4) Prepare 1 L2 mol / L mother liquor with distilled water and ammonia water, control the temperature of the reactor at 15 °C, add silicon powder particles into the mother liquor, and adjust the mechanical stirring speed to 1800 r...

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Abstract

The invention belongs to the technical field of a preparation method of chemical materials, and particularly relates to a preparation method of a silicon-silver composite anode material of a lithium ion battery and a reaction kettle. The method comprises the steps of: preparing silver-ammonia solution by taking ammonia water as a complexing agent; reacting in the specifically designed reaction kettle by taking glucose as a reducing agent; reducing silver nitrate by rigidly controlling the reaction temperature and a pH value, and uniformly and compactly coating silver on the surfaces of silicon powder particles so as to obtain the silicon-silver composite anode material of the lithium ion battery. The preparation method is simple in productive technology without any complicated device; and reactions are carried out at normal temperature, and industrial production is easy to realize. According to the invention, volume expansion of silicon powder is restrained to a certain extent; the reversible capacity of the battery is improved, and the cycle performance is improved; the conductivity of silicon is improved; and pulverization of silicon is restrained in charge and discharge processes, and the performance of silicon-based anode material is improved. By adopting the preparation method, the silicon-silver composite anode material achieves heavy-current charge and discharge, and the tap density of the material is improved at the same time.

Description

technical field [0001] The invention belongs to the technical field of preparation methods of chemical materials, and in particular relates to a preparation method and a reaction kettle of a silicon-silver composite negative electrode material for a lithium ion battery. Background technique [0002] Lithium-ion batteries have become an integral part of portable electronic devices since SONY commercially produced them in 1991. At the same time, under the pressure of global oil reserves and the environment, countries around the world are competing to develop hybrid vehicles and pure electric vehicles in recent years to replace traditional fuel vehicles. Therefore, the society's demand for lithium-ion batteries has promoted the continuous deepening of research on lithium-ion batteries. [0003] At present, commercial lithium-ion batteries use graphite as the negative electrode material, which has abundant sources and stable working voltage, but the theoretical capacity is only...

Claims

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Application Information

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IPC IPC(8): H01M4/38
CPCY02E60/12Y02E60/10
Inventor 方谋尚玉明王要武王树博陈敬波王金海赵骁谢晓峰
Owner TSINGHUA UNIV
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