Anode material of lithium battery

A cathode material, lithium battery technology, used in battery electrodes, lithium batteries, non-aqueous electrolyte batteries, etc., can solve problems such as powder loss, and achieve the effects of long service life, improved charge-discharge performance and energy density, and high peel strength.

Inactive Publication Date: 2019-02-22
昆山瑞柏电子材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are limits to this approach; the second is to increase the mass of the active material per unit area by increasing the unit weight or unit volume capacity of the electrode active material, and by increasing the amount of the active material in the slurry, thereby improving the material’s large magnification. Charge and discharge performance and energy density, but improving the quality of the active material will also bring about effects such as powder loss. Therefore, the proportion of the active material in the battery slurry is particularly important without affecting the performance of the battery.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Lithium battery positive electrode material, including positive electrode active material, binder, conductive agent, conductivity enhancer, dispersant, and slurry mixing solvent; the mass percentage of each component is: positive electrode active material 80%, binder 5%, conductive 6% additive, 3% conductive enhancer, 0.2% dispersant, 2% additive, 3.8% slurrying solvent, and the slurrying solvent is N,N-dimethylacetamide, dimethylsulfoxide, tetramethylurea , trimethyl phosphate, dimethyl formamide, and water are mixed solvents.

[0021] The positive electrode active material is one of lithium cobaltate, lithium manganate, lithium iron phosphate, lithium nickelate, or lithium manganese phosphate.

[0022] The binder is polyvinylidene fluoride or polytetrafluoroethylene.

[0023] The conductive agent is graphene, and the graphene is a graphene dispersion with a concentration of 4%.

[0024] The conductive enhancer is carbon nanotube or carbon nanofiber.

[0025] The di...

Embodiment 2

[0029] The difference compared with Example 1 is:

[0030] Lithium battery positive electrode material, including positive electrode active material, binder, conductive agent, conductivity enhancer, dispersant, and slurry mixing solvent; the mass percentage of each component is: positive electrode active material 62%, binder 10%, conductive 12% additive, 6% conductive enhancer, 1% dispersant, 3% auxiliary agent, 6% mixing solvent. The mixing solvent is N,N-dimethylacetamide, dimethyl sulfoxide, tetramethyl urea, trimethyl phosphate, dimethyl formamide, and water in a molar ratio of 6:1:1:0.5:3 : A mixed solvent mixed in a ratio of 5.

Embodiment 3

[0032] The difference compared with Example 1 is:

[0033] Lithium battery positive electrode material, including positive electrode active material, binder, conductive agent, conductivity enhancer, dispersant, and slurry mixing solvent; the mass percentage of each component is: positive electrode active material 75%, binder 7%, conductive 5% additive, 5% conductive enhancer, 0.8% dispersant, 2.2% auxiliary agent, 5% mixing solvent. The mixing solvent is N,N-dimethylacetamide, dimethyl sulfoxide, tetramethylurea, trimethyl phosphate, dimethyl formamide, and water in a molar ratio of 5.5:3:0.8:0.8:2.5 : Mixed solvent with a ratio of 5.5.

[0034] In the above embodiments, by adding a conductive enhancer and a dispersant, the solid matter in the slurry can be uniformly and stably dispersed without agglomeration. The lithium battery cathode material has excellent high temperature performance, high capacity retention, good cycle performance, and long service life. Long; using gr...

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PUM

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Abstract

The invention discloses an anode material of a lithium battery. The anode material is prepared from the following components in percent by mass: 62-80% of an anode active substance, 5-10% of a binder,5-12% of a conductive agent, 3-6% of a conductive enhancer, 0.2-1% of a dispersant, 1-3% of an auxiliary agent and 2-6% of a mixed solvent, wherein the mixed solvent is a mixture of N,N-dimethylacetamide, dimethyl sulfoxide, tetramethylurea, trimethyl phosphate, dimethylformamide and water. According to the anode material disclosed by the invention, the lithium battery is excellent in high temperature performance, high in capacity retention ratio, good in circulating performance and long in service life.

Description

technical field [0001] The invention belongs to the technical field of lithium batteries, and in particular relates to a lithium battery cathode material. Background technique [0002] With the wide application and rapid development of lithium batteries, people have higher and higher performance requirements for lithium-ion batteries, which not only require lithium batteries to have a higher capacity, but also require better capacity retention during repeated charging and discharging. rate, exhibits good cycle performance, and has a long service life. [0003] In order to increase the battery capacity, there are usually two methods, one is to increase the specific capacity of the electrode active material, and the other is to increase the proportion of the electrode active material in the positive electrode material, while reducing the content of other substances such as binders and conductive agents. Since the specific capacity of the positive electrode active material is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M10/052
CPCH01M4/62H01M4/623H01M4/625H01M10/052Y02E60/10
Inventor 李强吴佳利
Owner 昆山瑞柏电子材料有限公司
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