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Negative plate of lithium battery with excellent low-temperature performance

A low-temperature performance, lithium battery technology, applied in battery electrodes, non-aqueous electrolyte battery electrodes, electrode carriers/current collectors, etc. The effect of improving conductivity and lithium ion extraction rate, alleviating internal polarization

Inactive Publication Date: 2016-03-23
SHANDONG GOLDENCELL ELECTRONICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, using a single artificial graphite as the negative electrode material of the battery to make a lithium battery does not improve the poor low-temperature discharge capability of the battery.

Method used

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  • Negative plate of lithium battery with excellent low-temperature performance

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) Take a smooth and clean copper foil and place it on a flat glass, and put AgNO with a mass fraction of 0.25% 3 The solution is evenly sprayed onto the foil, and after standing for 0.5h, the current collector is taken out, washed with ethanol, and dried to obtain a negative electrode current collector with slightly corroded surface;

[0023] (2) Weigh 50g of graphene and add it to absolute ethanol, and ultrasonically disperse for 20min to prepare graphene suspension;

[0024] (3) Weigh 792g of artificial graphite and 88g of mesophase carbon microspheres for simple mixing, then add 50g of CMC and stir for 1 hour, slowly add deionized water to the mixed dry powder and continue stirring for 2 hours, and finally add 20g of SBR and the above graphene solution in sequence, Continue to stir for 1h to obtain negative electrode slurry;

[0025] (4) Apply the negative electrode slurry in the above step (3) to the current collector with micro-corrosion on the surface, and afte...

Embodiment 2

[0029] (1) Take a smooth and clean copper foil and place it on a flat glass, and put AgNO with a mass fraction of 0.25% 3 The solution was evenly sprayed onto the foil, and after standing for 2 hours, the current collector was taken out, washed with ethanol, and dried to obtain a negative electrode current collector with slightly corroded surface;

[0030] (2) Weigh 5g of graphene and add it to absolute ethanol, and ultrasonically disperse for 60 minutes to prepare a graphene suspension;

[0031] (3) Weigh 672g of artificial graphite and 288g of mesocarbon microspheres for simple mixing, then add 15g of CMC and stir for 2 hours, slowly add deionized water to the mixed dry powder and continue stirring for 4 hours, and finally add 2g of SBR and the above graphene solution in turn, continue Stir for 1h to obtain negative electrode slurry;

[0032] (4) Apply the negative electrode slurry in the above step (3) to the current collector with micro-corrosion on the surface, and after...

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Abstract

The invention discloses a negative plate of a lithium battery with excellent low-temperature performance. According to the main technical contents, an electronic current collector with a rough surface is obtained by AgNO<3> corrosive copper foil, so that the cohesiveness and the electrical conductivity between a negative paste and the foil are improved. A hybrid material of artificial graphite and mesocarbon microbeads is adopted as a negative active material, so that the discharge capability and the liquid absorbability of the battery are improved; meanwhile, the mass ratio of the artificial graphite to the mesocarbon microbeads is controlled to be (7:3) to (9:1); superconducting materials of graphene, CNTs and the like are selected to further improve the conductive capability of the material; and coating and rolling technologies of the negative plate are controlled to ensure high conductivity of the negative plate. A test result shows that the battery has excellent electrochemical properties in a low-temperature environment.

Description

technical field [0001] This patent relates to the field of lithium-ion batteries, in particular to a lithium battery negative plate with excellent low-temperature performance. Background technique [0002] Due to its high energy density, long cycle life, safety and stability, lithium-ion batteries have become a hot spot in the research of new energy technologies. At present, lithium batteries have been widely used in digital products, energy storage and electric vehicles and other fields. However, serious internal polarization and low conductivity exist in lithium batteries during low-temperature discharge, which affects the deintercalation behavior of lithium ions in the negative electrode material, making the battery poor in low-temperature discharge capability, or even unable to discharge electricity. This situation greatly limits the scope of use of lithium batteries and becomes an important obstacle to the development and promotion of lithium batteries. [0003] As we...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/583H01M4/62H01M4/64H01M4/66H01M4/13H01M4/139
CPCH01M4/13H01M4/139H01M4/583H01M4/625H01M4/64H01M4/66Y02E60/10
Inventor 关成善宗继月李涛梅庆虎周会
Owner SHANDONG GOLDENCELL ELECTRONICS TECH
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