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Silicon carbon composite anode material of lithium-ion battery, method for preparing silicon carbon composite anode material, and lithium-ion battery

A technology for lithium-ion batteries and negative electrode materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as inability to effectively inhibit silicon volume expansion and poor cycle performance of negative electrode materials, and achieve improved electrochemical stability and improved Specific capacity and cycle performance, effect of improving volume effect

Inactive Publication Date: 2012-04-04
CHERY AUTOMOBILE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The method is simple in process, and the carbonization reaction at room temperature reduces energy consumption, but the use of volatile concentrated sulfuric acid in the preparation process has adverse effects on the environment, and graphite cannot effectively inhibit the volume expansion of silicon, and the prepared negative electrode material is recycled. bad sex

Method used

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  • Silicon carbon composite anode material of lithium-ion battery, method for preparing silicon carbon composite anode material, and lithium-ion battery
  • Silicon carbon composite anode material of lithium-ion battery, method for preparing silicon carbon composite anode material, and lithium-ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Weigh 1g of silicon powder, 1.2g of graphite and 0.8g of expanded graphite, mix them uniformly, put them into a ball mill, and ball mill for 12 hours at a speed of 400r / min to obtain the product silicon-carbon composite negative electrode material for lithium-ion batteries.

[0030] The obtained negative electrode material is mixed with conductive agent acetylene black and binder PVDF (polyvinylidene fluoride) according to the mass ratio of 80:10:10, and the mixture is prepared into slurry with NMP (1-methyl-2-pyrrolidone) , uniformly coated on the copper foil, and dried for 24 hours at 80°C under a vacuum of 0.02MP to obtain a pole piece for an experimental battery. With lithium sheet as the counter electrode, the electrolyte is 1mol / L LiPF 6 EC (ethyl carbonate) + DMC (dimethyl carbonate) (volume ratio 1:1) solution, the diaphragm is celgard2400 film, assembled into a CR2025 button cell in a glove box filled with an argon atmosphere.

[0031] After testing, the first...

Embodiment 2

[0033] Weigh 1g of SiO powder, 1.2g of graphite and 0.8g of expanded graphite, mix them evenly, put them into a ball mill, and ball mill for 8 hours at a speed of 500r / min to obtain the product silicon-carbon composite negative electrode material for lithium-ion batteries.

[0034] The lithium-ion battery was prepared by the method described in Example 1. After testing, the first discharge specific capacity reached 923mAh / g, and remained at 393mAh / g after 100 cycles.

Embodiment 3

[0036]Weigh 0.5g of silicon powder, 0.5g of SiO powder, 1.2g of graphite and 0.8g of expanded graphite, mix them uniformly, put them into a ball mill, and ball mill at a speed of 300r / min for 20h to obtain the product silicon-carbon composite negative electrode material for a lithium-ion battery.

[0037] The lithium-ion battery was prepared by the method described in Example 1. After testing, the first discharge specific capacity reached 1123mAh / g, and remained at 550mAh / g after 100 cycles.

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Abstract

The invention provides a silicon carbon composite anode material of a lithium-ion battery, a method for preparing the silicon carbon composite anode material, and the lithium-ion battery. The silicon carbon composite anode material comprises two groups of substances, such as (a) silicon powder, silicon oxide (SiO) powder or a mixture of the silicon powder and the SiO powder, and (b) graphite and expanded graphite. The method for preparing the silicon carbon composite anode material comprises the following steps of: mixing components (a) and components (b); placing a mixture into a ball mill; and ball-milling for 1 to 24 h at the rotation speed of 100 to 600 r / min. By the method, the preparation process is simple and cost is low. The prepared anode material has excellent conducting performance. Correspondingly, the lithium-ion battery is high in specific capacity and good in cycle performance.

Description

technical field [0001] The invention belongs to the technical field of battery manufacturing, and in particular relates to a preparation method of a negative electrode material of a lithium ion battery and the battery. Background technique [0002] With the depletion of fossil fuels and the rapid development of portable electronic devices and electric vehicles, the research on new energy sources such as power source batteries has become the focus of global attention. Excellent properties such as good performance, environmental friendliness, structural diversity and low price have been widely used. As far as the structure of lithium ion battery is concerned, it is mainly composed of positive electrode, negative electrode, separator and electrolyte, and whether the electrode performance of negative electrode material can be further improved becomes the decisive factor restricting the performance of lithium ion battery. [0003] In view of the development requirements of lithi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38H01M10/0525
CPCY02E60/122Y02E60/10
Inventor 朱广燕曾绍忠刘三兵
Owner CHERY AUTOMOBILE CO LTD
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