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Preparation method of hard carbon/graphene composite anode material used in lithium battery

A graphene composite and negative electrode material technology, applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problems of inability to charge and discharge at a large rate, large loss of reversible specific capacity, poor electrolyte compatibility, etc., achieve high cost performance, overcome Large reversible specific capacity loss and stable product performance

Active Publication Date: 2018-02-23
JIANGSU SAINTY HI TECH & CARBON MATERIALS
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0008] The preparation method of the present invention can solve the disadvantages of poor structural stability, poor compatibility with electrolyte, and slow diffusion speed of general lithium battery graphite negative electrode materials, which cause the material to be unable to be charged and discharged at a large rate, and at the same time avoid the first charge and discharge of hard carbon materials. The problem of large reversible specific capacity loss in

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  • Preparation method of hard carbon/graphene composite anode material used in lithium battery

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Embodiment 1

[0032] A preparation method for a hard carbon / graphene composite negative electrode material for a lithium battery, the specific process of preparing the composite negative electrode material is as follows:

[0033]Put the starch in a corundum crucible, then place the crucible in a tubular resistance furnace, raise the temperature to 240°C under the protection of a nitrogen atmosphere, and stabilize the starch for 10 minutes to cause a dehydration reaction between its molecules; Add 1kg of flaky graphene and 2kg of processed starch to 3.9kg of ethanol, stir well and disperse evenly, add 1kg of a mixed solution of sodium metaaluminate and sodium hydroxide, the mass concentration of sodium metaaluminate is 0.5%, The mass concentration of sodium hydroxide is 1%, aged at room temperature for 2h, and then moved into a high-temperature reaction kettle with a polytetrafluoroethylene substrate, and firstly treated with an ultrasonic frequency of 80kHz for 50min, and then at a temperatu...

Embodiment 2

[0036] A preparation method for a hard carbon / graphene composite negative electrode material for a lithium battery, the specific process of preparing the composite negative electrode material is as follows:

[0037] Put the sucrose in a corundum crucible, and then put the crucible in a tubular resistance furnace. Under the protection of argon atmosphere, raise the temperature to 200°C, and stabilize the sucrose for 15 minutes to make dehydration reaction between molecules ; 1kg flake graphene and 3kg processed sucrose are added in 5.2kg glycerol, fully stirred and dispersed evenly, add the mixed solution of 1.3kg sodium metaaluminate and sodium hydroxide, the mass concentration of sodium metaaluminate 1%, the mass concentration of sodium hydroxide is 2%, aged at room temperature for 1.5h, and then moved into a high-temperature reaction kettle with polytetrafluoroethylene as the substrate, firstly treated with ultrasonic frequency of 80kHz for 40min, and then Raise the temperat...

Embodiment 3

[0040] A preparation method for a hard carbon / graphene composite negative electrode material for a lithium battery, the specific process of preparing the composite negative electrode material is as follows:

[0041] Put the starch in a corundum crucible, then place the crucible in a tubular resistance furnace, raise the temperature to 230°C under the protection of a nitrogen atmosphere, and stabilize the starch for 12 minutes to cause dehydration reaction between its molecules; Add 1kg of flaky graphene and 2.5kg of treated starch to 4.6kg of ethanol, stir well and disperse evenly, add 1.2kg of a mixture of sodium metaaluminate and sodium hydroxide, the mass concentration of sodium metaaluminate is 0.5% , the mass concentration of sodium hydroxide is 1%, aged at room temperature for 1h, and then moved into a high-temperature reaction kettle with polytetrafluoroethylene as the substrate. Raise the temperature to 190°C at a high rate and keep it warm for 4 hours to swell the spe...

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Abstract

The invention belongs to the technical field of preparation of lithium battery anode materials, and provides a preparation method of a hard carbon / graphene composite anode material used in a lithium battery. The method comprises the steps that after being stabilized, an organic polymer is mixed with laminar graphene in an organic solvent, the temperature is raised for a reaction after ultrasonic treatment, and a hard carbon / graphene composite precursor is obtained; the precursor is mixed with nanometer spherical metal powder, high-temperature thermal decomposition is conducted under the protection of gas, spherical hard carbon is generated, the surface of the nanometer spherical metal powder is coated with the spherical hard carbon, the spherical hard carbon is arranged between the laminargraphene in a sandwiched mode, and then the hard carbon / graphene composite anode material is obtained. Compared with a traditional method, the hard carbon / graphene composite anode material prepared by using the method is large in electrode capacity, the lithium battery prepared from the hard carbon / graphene composite anode material is good in stability and cycle performance, the defect that a general anode material is large in reversible capacity loss is overcome, the whole preparation process is easy to control, the product appearance and performance are stable, and the cost performance is high.

Description

technical field [0001] The invention belongs to the technical field of preparation of negative electrode materials for lithium batteries, and provides a method for preparing hard carbon / graphene composite negative electrode materials for lithium batteries. Background technique [0002] Lithium metal has many advantages such as light weight, negative electrode potential and high specific capacity. It was introduced into the battery field in 1958. The rechargeable lithium battery made of this material has high specific energy and high specific power. It entered the field of lithium primary batteries in 1970. In the commercial research and development stage, since 1990, with the innovation of positive electrode materials, negative electrode materials and electrolytes, rechargeable secondary lithium batteries have been continuously developed and commercialized. Today, the continuous development of lithium battery technology is constantly improving human life. [0003] Lithium-i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62
CPCH01M4/625Y02E60/10
Inventor 陈庆廖健淞
Owner JIANGSU SAINTY HI TECH & CARBON MATERIALS