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Preparation method for synthesizing graphite particle negative electrode material

A technology for synthesizing graphite and negative electrode materials, applied in the directions of graphite, battery electrodes, electrical components, etc., can solve the problems of limiting the rapid charge and discharge performance of lithium ion batteries, shortening the service life of lithium ion batteries, and the difficulty of pulling the battery pole pieces into pulp sheets. , to achieve the effect of good high current charge and discharge performance, increased end face ratio and high isotropy

Inactive Publication Date: 2014-05-21
XINXIANG SAIRI NEW ENERGY SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the commercially used graphite-based negative electrode materials are mostly anisotropic graphite, and its high orientation determines the selectivity of the intercalation / extraction direction of lithium ions, and the volume shrinkage effect of the material is greater during the charge and discharge process. , which not only limits the high-current rapid charge and discharge performance of lithium-ion batteries but also shortens the service life of lithium-ion batteries. In addition, the high orientation of graphite also makes it difficult to pull pulp and make sheets when preparing battery pole pieces. The negative electrode material is easy to fall off from the electrode, which increases the difficulty of the electrode sheet preparation process

Method used

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  • Preparation method for synthesizing graphite particle negative electrode material
  • Preparation method for synthesizing graphite particle negative electrode material
  • Preparation method for synthesizing graphite particle negative electrode material

Examples

Experimental program
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Effect test

Embodiment 1

[0023] According to the mass ratio of asphalt and graphite 15:85, take 500.0kg of natural graphite powder with D50=5.0μm obtained through crushing, grading and sieving, and put it into the reaction kettle and heat it while stirring, and the heating temperature is up to 120°C. Take 88.2kg of medium-temperature asphalt with a softening point of 60°C and transport it to an asphalt melting tank through a pipeline. Hour. After the kneading is completed, the material is spread flat on a clean stage, and when the temperature of the material drops to room temperature, it is packaged and then graphitized. The graphitization treatment temperature is 2900° C., and the time period is 15 days. After the graphitization is completed, the material is crushed, classified, surface modified, and sieved to obtain the product.

Embodiment 2

[0025] According to the mass ratio of asphalt and graphite 25:75, take 500.0kg of D50=6.0μm high-purity artificial graphite powder obtained through crushing, grading and sieving, and put it into the reaction kettle while stirring and heating, and the heating temperature is 180°C. Take 166.7kg of medium-temperature asphalt with a softening point of 90°C and transport it to an asphalt melting kettle through a pipeline. Hour. After the kneading is completed, the material is spread flat on a clean stage, and when the temperature of the material drops to room temperature, it is packaged and then graphitized. The graphitization treatment temperature is 3200° C., and the time period is 20 days. After the graphitization is completed, the material is crushed, classified, surface modified, and sieved to obtain the product.

Embodiment 3

[0027] According to pitch and graphite feed mass ratio 30:70, take D50=8.0μm natural graphite powder and high-purity artificial graphite powder that obtain through pulverization, classification, sieving treatment and each 250.0kg puts into reactor while stirring and heating, heating temperature to 160°C. Take 214.3 kg of medium-temperature asphalt with a softening point of 80°C, and transport it to the asphalt melting kettle through a pipeline, the melting temperature is 130°C, and then flow the melted asphalt from the upper end of the reactor for kneading, the kneading temperature is 160°C, and the kneading time is 2.5 Hour. After the kneading is completed, the material is spread flat on a clean stage, and when the temperature of the material drops to room temperature, it is packaged and then graphitized. The graphitization treatment temperature is 3000° C., and the time period is 18 days. After the graphitization is completed, the material is crushed, classified, surface m...

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Abstract

The invention belongs to the fields of material synthesis and energy utilization and in particular relates to a preparation method for synthesizing a graphite particle negative electrode material of a lithium ion battery. The method comprises the following steps: crushing, grading and screening an anisotropic graphite raw material to obtain superfine graphite powder with the average particle size of 2-10 microns, and performing secondary granulation technology treatment, namely kneading, molding, carbonizing, graphitizing, crushing, grading, spheroidizing and screening, so that the isotropy of the graphite particles and the end face / base surface ratio of the graphite particles are improved, and the volume expansion and shrinkage effect of the material in the lithium embedding and removal process and the high-current charge and charge performance of the material are improved. The preparation process is safe and controllable, the prepared material is high in isotropy degree, the material volume change in the lithium embedding and removal process is small, the cycle performance can be obviously improved, the end-face ratio of the graphite particles is improved due to secondary granulation treatment, and the material has good high-current charge and charge performance.

Description

technical field [0001] The invention belongs to the field of material synthesis and energy utilization, and in particular relates to a method for preparing a synthetic graphite particle negative electrode material of a lithium ion battery. Background technique [0002] Compared with other secondary batteries, lithium-ion batteries are more in line with the development trend of the battery industry due to their advantages such as high specific energy, small size, light weight, no memory effect, and environmental protection, so they become portable electronic devices and future new energy sources. The car's preferred power source. As an important part of lithium-ion batteries, negative electrode materials are the key to realizing the miniaturization and high-capacity of lithium-ion batteries. At present, lithium-ion batteries mostly use carbon materials as negative electrode materials. Among them, graphite-based carbon materials are the most widely used due to their low lithi...

Claims

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Application Information

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IPC IPC(8): H01M4/587C01B31/04C01B32/21
CPCC01B32/20H01M4/587H01M10/0525Y02E60/10
Inventor 邹武刘玉军张文静
Owner XINXIANG SAIRI NEW ENERGY SCI & TECH
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