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A kind of preparation method of graphite negative electrode material used in lithium ion battery

A lithium-ion battery, graphite anode technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problem of liquid absorption capacity, poor coating consistency and electrical conductivity, low compaction density of porous structures, and difficult consistency. control and other issues, to achieve the effect of improving the liquid absorption and retention capacity, improving the structural stability and rate performance, and improving the electrical conductivity

Active Publication Date: 2019-02-01
JIANGXI JIAYE LITHIUM BATTERY NEW ENERGY TECH CO LTD
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  • Application Information

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Problems solved by technology

[0003] At present, the anode materials used in the market are mainly made of graphite coated with pitch, petroleum coke, phenolic resin, etc. Although they have a large specific surface area, their liquid absorption capacity, coating consistency and electrical conductivity are poor, which affects their performance. further improvement
[0004] Chinese patent CN102169988 A can prepare a composite graphite material with a porous structure carbon material coating layer through a series of processes such as graphite and pitch mixing, cross-linking reaction, high temperature oxidation, although the composite graphite material is in terms of gram capacity and first-time efficiency It has been improved, but the porous structure has defects such as low compaction density, poor electrical conductivity and difficult control of consistency

Method used

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  • A kind of preparation method of graphite negative electrode material used in lithium ion battery
  • A kind of preparation method of graphite negative electrode material used in lithium ion battery
  • A kind of preparation method of graphite negative electrode material used in lithium ion battery

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preparation example Construction

[0024] The preparation method of the present invention comprises three processes of preparation of conductive gel solution, preparation of graphite colloid composite material and preparation of porous graphite negative electrode material, water-based solvent, composite conductive agent and binder are used in the preparation process of conductive gel solution, and the preparation process of graphite colloid composite material Graphite and conductive gel solution are used in the porous graphite negative electrode material. Graphite colloid composite material, active agent and double distilled water are used in the preparation process of porous graphite negative electrode material. The aqueous solvent is deionized water. The composite conductive agent is composed of carbon nanotubes and activated carbon. The agent is LAl32, the graphite is either natural graphite or artificial graphite, and the active agent is any one of KOH and NaOH.

[0025] According to the technical solution, ...

Embodiment 1

[0027] Weigh 6 grams of LAl32 binder, 1 gram of carbon nanotubes, 9 grams of activated carbon and 100 grams of deionized water, mix them together and stir for 2 hours to prepare a conductive adhesive solution. 15 grams of graphite with a particle size of 50 μm was added to the conductive adhesive solution and put into a high-speed disperser to disperse for 10 hours to prepare a graphite colloidal composite material. 100 grams of graphite colloidal composite material and 300 grams of KOH were put into 1500 grams of secondary distilled water and soaked for 5 hours and were prepared into a saturated solution, after which the saturated solution was moved to the carbonization furnace and heated under N 2 Activation was carried out under protection. First, the temperature was raised to 400°C at a constant temperature for 30 minutes at a heating rate of 4°C / min, and then activated at a temperature of 850°C for 80 minutes. 2 After cooling down to room temperature with the furnace unde...

Embodiment 2

[0029] Weigh 8 grams of LAl32 binder, 2 grams of carbon nanotubes, 8 grams of activated carbon and 100 grams of deionized water, mix together and stir for 3 hours to prepare a conductive adhesive solution. 13 grams of graphite with a particle size of 50 μm was added to the conductive adhesive solution and put into a high-speed disperser to disperse for 12 hours to prepare a graphite colloidal composite material. 100 grams of graphite colloidal composite material and 400 grams of NaOH were put into 10000 grams of twice distilled water and soaked for 6 hours and were prepared as a saturated solution, after which the saturated solution was moved to the carbonization furnace and heated under N 2 Activation was carried out under protection. First, the temperature was raised to 300°C at a constant temperature for 40 minutes at a heating rate of 4°C / min, and then activated for 100 minutes when the temperature was raised to 850°C. 2 After cooling down to room temperature with the furn...

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Abstract

The invention provides a preparation method of a graphite negative electrode material for a lithium-ion battery. The method comprises three processes of conductive adhesive preparation, colloidal graphite composite material preparation and porous graphite negative electrode material preparation, wherein an aqueous solvent, a composite conductive agent and a binder are used in the conductive adhesive preparation process; graphite and a conductive adhesive are used in the colloidal graphite composite material preparation process; and a colloidal graphite composite material, an active agent and double-distilled water are used in the porous graphite negative electrode material preparation process. According to the preparation method, a layer of conductive adhesive which is good in conductivity and easy to activate coats the surface of the graphite; activated carbon is activated through activation to generate nanopores which are relatively small in aperture and is decomposed with the binder in the conductive adhesive to leave micro-pores which are relatively large in aperture; and the nanopores generate a synergistic effect in the lithium-ion battery, so that the prepared graphite negative electrode material has the characteristics of high liquid absorption and retention capacity, high compaction density, high conductivity, good cycle performance and the like.

Description

technical field [0001] The invention belongs to the technical field of negative electrode materials for lithium ion batteries, in particular to a method for preparing graphite negative electrode materials used in lithium ion batteries. Background technique [0002] Anode materials are the main components of lithium-ion batteries, and their performance affects the cycle performance, rate performance and consistency of lithium-ion batteries. [0003] At present, the anode materials used in the market are mainly made of graphite coated with pitch, petroleum coke, phenolic resin, etc. Although they have a large specific surface area, their liquid absorption capacity, coating consistency and electrical conductivity are poor, which affects their performance. further improvement. [0004] Chinese patent CN102169988 A can prepare a composite graphite material with a porous structure carbon material coating layer through a series of processes such as graphite and pitch mixing, cross...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/583H01M4/1393H01M10/0525
CPCH01M4/1393H01M4/583H01M10/0525Y02E60/10
Inventor 李志超
Owner JIANGXI JIAYE LITHIUM BATTERY NEW ENERGY TECH CO LTD
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