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Negative electrode material of low-temperature lithium battery and preparation method of negative electrode material

A low-temperature lithium battery and negative electrode material technology, applied in electrode manufacturing, battery electrodes, lithium batteries, etc., can solve the problems of poor electrical conductivity, poor low-temperature performance, and poor work performance, and achieve high isotropy, shrinkage, and good electrical conductivity

Active Publication Date: 2017-01-04
HEFEI HENGNENG NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the low-temperature performance of lithium-ion batteries is relatively poor at present, especially in low-temperature environments below -30°C.
The main component of the existing lithium battery negative electrode material is artificial graphite, which has poor conductivity, especially in low temperature environments, and its conductivity is even worse

Method used

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  • Negative electrode material of low-temperature lithium battery and preparation method of negative electrode material

Examples

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Comparison scheme
Effect test

Embodiment 1

[0036] A preparation method of a negative electrode material for a low-temperature lithium battery, the steps of which are as follows:

[0037] (1) Shaping and crushing

[0038] Add 30 parts of petroleum coke, 5 parts of needle coke, 30 parts of mesocarbon microspheres, and 30 parts of isotropic coke into a pulverizer for agitation and ball milling, and use wet agitation and ball milling to obtain mixed powder;

[0039] (2) intercalation micro-expansion

[0040] Put the mixed powder and concentrated nitric acid into the mixer and stir it ultrasonically for 0.5h, then separate the powder through a centrifuge, and wash the powder with pure water and ethanol until the pH value is 6; then put the powder at 85°C Drying for 10 hours After drying, place in a protective atmosphere at a temperature of 500°C for 10 hours; finally cool to room temperature to obtain micro-expanded graphite;

[0041] (3) Agglomeration and granulation

[0042] Add the micro-expanded graphite together wit...

Embodiment 2

[0050] A preparation method of a negative electrode material for a low-temperature lithium battery, the steps of which are as follows:

[0051] (1) Shaping and crushing

[0052] Add 40 parts of petroleum coke, 15 parts of needle coke, 20 parts of mesocarbon microspheres, and 20 parts of isotropic coke into a pulverizer for agitating ball mill, and use wet method agitating and ball milling to obtain mixed powder;

[0053] (2) intercalation micro-expansion

[0054] Add the mixed powder and perchloric acid into the mixer and stir it ultrasonically for 1 hour, then separate the powder through a centrifuge, and wash the powder with pure water and ethanol until the pH value is 8; then put the powder at 50°C After drying for 24 hours, place it in a protective atmosphere at a temperature of 900°C for 1 hour; finally cool to room temperature to obtain micro-expanded graphite;

[0055] (3) Agglomeration and granulation

[0056] Adding micro-expanded graphite together with coal tar an...

Embodiment 3

[0064] A preparation method of a negative electrode material for a low-temperature lithium battery, the steps of which are as follows:

[0065] (1) Shaping and crushing

[0066] Add 35 parts of petroleum coke, 10 parts of needle coke, 25 parts of mesocarbon microspheres, and 25 parts of isotropic coke into a pulverizer for agitation ball mill, and use wet agitation ball milling to obtain mixed powder;

[0067] (2) intercalation micro-expansion

[0068]Add the mixed powder and concentrated sulfuric acid into the mixer and stir it ultrasonically for 0.5h, then separate the powder through a centrifuge, and wash the powder with pure water and ethanol until the pH value is 7; then put the powder at 75°C After drying for 20 hours, place it in a protective atmosphere at a temperature of 700°C for 5 hours; finally cool to room temperature to obtain micro-expanded graphite;

[0069] (3) Agglomeration and granulation

[0070] Add micro-expanded graphite together with coal tar pitch a...

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Abstract

The invention discloses a negative electrode material of a low-temperature lithium battery and a preparation method of the negative electrode material. The negative electrode material is prepared from 30-40 parts of petroleum coke, 5-15 parts of needle coke, 20-30 parts of mesocarbon microbead, 5-10 parts of amorphous carbon and 20-30 parts of isotropic coke. In the negative electrode material, the amorphous carbon, the mesocarbon microbead and the isotropic coke are isotropic materials; compared with artificial graphite, the negative electrode material has the advantages of the diffusion speed of lithium ion is relatively fast, and the conductive effect of the material is higher; and since the gram capacity is relatively low, the needle coke and the petroleum coke in a certain proportion are added, the gram capacity requirement is met.

Description

technical field [0001] The invention relates to the field of lithium batteries, in particular to a negative electrode material for a low-temperature lithium battery and a preparation method thereof. Background technique [0002] Lithium batteries have the characteristics of high nominal voltage, high specific energy, long cycle life, no memory effect, etc., and are environmentally friendly and pollution-free. Therefore, they are widely used in digital products such as mobile phones, notebook computers, and MP3s. At the same time, they are used in electric vehicles, Electric bicycles, national defense equipment and other industries are also widely used. In recent years, lithium batteries have been used more and more widely in various fields. The environment in which batteries are used is complex, and the performance requirements for batteries are also higher. Even at low temperatures, the device can be started quickly. However, the low-temperature performance of lithium-ion...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/587H01M4/04H01M10/052
CPCH01M4/0471H01M4/364H01M4/587H01M10/052Y02E60/10
Inventor 武玉哲朱炜宏陈军刘欣丁蒙蒙刘琦
Owner HEFEI HENGNENG NEW ENERGY TECH
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