Fast charge graphite negative electrode material and preparation method thereof

A graphite anode, graphite technology, applied in the preparation/purification of carbon, chemical instruments and methods, battery electrodes, etc., can solve the problems of low initial efficiency, poor cycle performance, and many structural defects of materials, and achieve excellent cycle performance, high Magnification, strong bonding effect

Inactive Publication Date: 2018-01-19
天津爱敏特电池材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method is to coat amorphous carbon on the surface of graphite, it requires multiple high-temperature heat treatments, the process is complicated, and the energy consumption is high. Moreover, the carbon coated on the surface has not been subjected to high-temperature graphitization treatment, and the amorphous carbon has many structural defects. The material has low initial efficiency and poor cycle performance

Method used

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  • Fast charge graphite negative electrode material and preparation method thereof
  • Fast charge graphite negative electrode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Add 4 kg of needle coke (D50 is 7.0 μm) and 1 kg of phenolic resin (D50 is 5.0 μm) alternately into the double-helix conical mixer and mix for 2 hours, then transfer to a medium temperature treatment furnace and heat to 500 °C under nitrogen protection Heat treatment for 4 hours, naturally cool to room temperature, and then conduct graphitization treatment at 3000°C for 36 hours. After mixing and screening, the fast-charging graphite negative electrode material is prepared.

Embodiment 2

[0030] Add 4.5kg of petroleum coke (D50 is 5.0μm) and starch (D50 is 15.0μm) 0.5kg alternately into the double-helix conical mixer and mix for 2 hours, then transfer to a medium temperature treatment furnace and heat to 600°C under nitrogen protection Heat treatment for 3 hours, naturally cool to room temperature, and then conduct graphitization treatment at 2800°C for 48 hours. After mixing and screening, the fast-charging graphite negative electrode material is prepared.

Embodiment 3

[0032] Add 4.5kg of spherical natural graphite (D50 is 8.0μm) and 2kg of glucose (25% aqueous solution) into the liquid phase coating machine and mix for 2 hours, then spray dry, and transfer the dried powder to a medium temperature treatment furnace, and under the protection of nitrogen Heating to 550°C for 5h heat treatment, cooling to room temperature naturally, and then performing graphitization treatment at 2900°C for 48h, mixing and sieving to obtain a fast-charging graphite negative electrode material.

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Abstract

The invention discloses a fast charge graphite negative electrode material and a preparation method thereof. Through mixing of a graphite precursor and a coating material, low temperature treatment and high temperature graphitization treatment, the fast charge graphite negative electrode material for lithium ion batteries can be obtained. High temperature graphitization treatment enables conversion of the graphite precursor into high capacity graphite, at the same time the coating material converts to a structurally stable amorphous carbon coating layer, thus being conducive to rapid transmission of lithium ions in the material and electrolyte solution interface, significantly enhancing the charge-discharge rate and cycle performance of graphite material, and also ensuring high capacity and high initial coulombic efficiency. The process adopted by the invention is simple and low in energy consumption, and the fast charge graphite negative electrode material is suitable for commercial production and application in lithium ion batteries.

Description

technical field [0001] The invention relates to the field of negative electrode materials for lithium ion batteries, in particular to a fast-charging graphite negative electrode material and a preparation method thereof. Background technique [0002] With the rapid development of electric vehicles, people are eager for electric vehicles to have long battery life and fast charging and discharging performance. Therefore, the demand for high-capacity and high-rate lithium-ion batteries is increasing year by year. Lithium titanate has a high charge-discharge rate due to its unique crystal structure, however, its low gram capacity and high voltage platform severely restrict its application in electric vehicles. Graphite has a gram capacity more than double that of lithium titanate, and has become the main negative electrode material for electric vehicles. As the power demand for electric vehicle batteries continues to increase, there is a particular need for anode materials that...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/205C01B32/05H01M4/36H01M4/587H01M10/0525
CPCY02E60/10
Inventor 王圆方梁运辉高川代建国
Owner 天津爱敏特电池材料有限公司
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