Negative electrode material of high-power lithium battery, preparation method and lithium battery

A negative electrode material, lithium battery technology, applied in electrode manufacturing, battery electrode, electrode current collector coating, etc. The problem of high uniformity degree correlation, etc., can achieve good slurry dispersion effect, improve electronic and ionic conductivity, and reduce slurry mixing time.

Inactive Publication Date: 2020-07-10
FENGFAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above methods are basically two types of processes, one is to compound graphite and amorphous carbon in the material stage, but due to the low degree of graphitization of amorphous carbon, the negative electrode material after simple compounding is due to amorphous carbon (soft carbon, hard carbon) The coating leads to the deterioration of the electronic conductivity of the composite material, which affects the migration of electrons du

Method used

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  • Negative electrode material of high-power lithium battery, preparation method and lithium battery
  • Negative electrode material of high-power lithium battery, preparation method and lithium battery
  • Negative electrode material of high-power lithium battery, preparation method and lithium battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] (1) Preparation of modified artificial graphite negative electrode material:

[0040] D50 is 4 μ m small particle size graphite material mixed with 15wt% strong alkali KOH solution, and filtered at 75 ° C after stirring for 48 hours, after cleaning, the graphite material A whose surface corrosion produces a porous structure is obtained; graphite material A 93% , corn starch 6%, and conductive carbon black sp 1% are fused with a mechanical fusion machine for 1h to obtain graphite-coated precursor B; then graphite-coated precursor B is placed in a graphite crucible, and put into N 2 Carry out carbonization in an atmosphere furnace protected by inert gas. The carbonization temperature is controlled at 1300°C, and the temperature is maintained for 20 hours. Finally, it is cooled to room temperature at 25°C, and airflow crushing is carried out to obtain a surface-coated modified high-power lithium-ion battery graphite negative electrode. Material.

[0041] (2) Preparation o...

Embodiment 2

[0046] The preparation of the modified artificial graphite negative electrode material and the battery preparation process of Example 2 and Example 1 are the same, the difference lies in the preparation of the first step premix in the negative electrode sheet preparation process: the modified negative electrode material is coated on the surface Together with the hard carbon as the negative electrode active material, the negative electrode material that is about to be coated with the surface and the hard carbon material and the conductive carbon black are added together in a strong mixer and premixed for 5 minutes to obtain a premixed material. The other slurry mixing steps are the same as in Example 1. In one hundred parts by weight of negative electrode slurry (negative electrode material+hard carbon): conductive agent: CMC: SBR = (90-97): (0-5): (1-2): (1-3).

Embodiment 3

[0048] The preparation of the modified artificial graphite negative electrode material and the battery preparation process of Example 3 and Example 1 are the same, the difference lies in the preparation of the first step premix in the negative electrode sheet preparation process: the surface is coated with the modified negative electrode material Together with soft carbon as negative electrode active material, the negative electrode material with surface coating modification, soft carbon material and conductive carbon black are added together in a strong mixer for premixing for 5 minutes to obtain a premixed material, and other slurry mixing steps are the same as in Example 1. In one hundred parts by weight of negative electrode slurry (negative electrode material + soft carbon): conductive agent: CMC: SBR = (90-97): (0-5): (1-2): (1-3).

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Abstract

The invention discloses a negative electrode material of a high-power lithium battery, a preparation method and the lithium battery. The negative electrode material is of a granular structure, and comprises an inner core and a coating layer coating the inner core. The inner core is artificial graphite with a porous structure on the surface after being corroded by oxidants; and the coating layer comprises amorphous carbon and a conductive agent, wherein the coating layer is uniformly dispersed on the surface of artificial graphite particles, and the conductive agent is uniformly distributed ordistributed in the coating layer in an island shape. The negative electrode material disclosed by the invention is premixed by a special premixing process, and a negative plate is prepared by a special slurry mixing process from low viscosity to high viscosity; the lithium battery prepared from the negative plate has the advantages of high specific power and high-rate charge-discharge performance,and being capable of reaching 25C or above current continuous charge and discharge, 35C or above current pulse charge and 40C or above current pulse discharge; the power density of the battery can reach 5,000 W/kg or above, and the working temperature range is wide and can reach -30 DEG C-65 DEG C; and the battery can realize 2C or above current charging and discharging at the low temperature, and the battery has the excellent low-temperature cycle life.

Description

technical field [0001] The invention relates to a fast-charging negative electrode material, a preparation method thereof, and a high-rate lithium-ion battery for HEV or 48V systems prepared by using the negative electrode material, belonging to the technical field of lithium batteries. Background technique [0002] Under the dual pressure of energy crisis and environmental protection, energy saving and new energy vehicles have become the top priority of the country. Under the dual pressure of energy crisis and environmental protection, energy saving and new energy vehicles have become the top priority of the country. Under the pressure of environmental protection and policies and regulations on fuel consumption limits, car companies have adopted various measures. Hybrid technology is an important energy-saving technology. After the withdrawal of new energy vehicle subsidies in 2020, hybrid technology is likely to welcome to explosive growth. With the development of hybrid...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/583H01M4/62H01M4/133H01M4/1393H01M4/04H01M10/0525
CPCH01M4/0404H01M4/133H01M4/1393H01M4/366H01M4/583H01M4/62H01M4/625H01M4/628H01M10/0525H01M2220/20Y02E60/10
Inventor 俞晓峰刘慧洁赵晓伟杨淑娟顾志华高良秋周宏
Owner FENGFAN
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