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Lithium ion battery pole piece and manufacturing method thereof

A lithium-ion battery and pole piece technology, which is applied to battery electrodes, secondary batteries, electrode carriers/collectors, etc., can solve the problems of affecting production efficiency and time-consuming, so as to reduce the injection speed, reduce side reactions, and fast The effect of absorption speed and liquid retention capacity

Inactive Publication Date: 2019-12-31
河南平煤国能锂电有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the production of lithium-ion batteries, the perfusion of electrolyte is an important process. In the prior art, the perfusion of electrolyte often takes a long time, which affects production efficiency.

Method used

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  • Lithium ion battery pole piece and manufacturing method thereof
  • Lithium ion battery pole piece and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] (1) Preparation of lithium-ion battery positive pole piece

[0021] Active material positive electrode sheet production:

[0022] Lithium iron phosphate, conductive carbon black, binder polyvinylidene fluoride, and N-methylpyrrolidone are mixed uniformly at a mass ratio of 96:2.5:1.5 to make a lithium-ion battery positive electrode slurry, which is coated on the current collector aluminum foil; Dry at 87° C., and then carry out roll-cutting and die-cutting to obtain positive electrode sheets of active materials.

[0023] Apply ceramic coating:

[0024] The lithium metaaluminate ceramic powder with a maximum particle size of 100nm, the binder polyvinylidene fluoride, and the solvent N-methylpyrrolidone are prepared into a ceramic slurry, and the mass parts are: 5 parts of lithium metaaluminate ceramic powder , 1 part of polyvinylidene fluoride, 30 parts of N-methylpyrrolidone; then the prepared ceramic slurry is evenly coated on the positive electrode sheet of the acti...

Embodiment 2

[0048] (1) The same method as in Example 1 was used to prepare the positive electrode sheet of the lithium ion battery active material.

[0049] Apply ceramic coating:

[0050] Lithium metaaluminate ceramic powder, zirconia ceramic powder, binder polyvinylidene fluoride, and solvent N-methylpyrrolidone are formulated into a ceramic slurry, and the parts by mass are: 3 parts of lithium metaaluminate ceramic powder, 2 parts of zirconia ceramic powder, 1 part of polyvinylidene fluoride, 30 parts of N-methylpyrrolidone (wherein the maximum particle size of lithium metaaluminate ceramic powder and zirconia ceramic powder is 100nm); then the prepared The ceramic slurry was uniformly coated on the positive electrode sheet of the active material prepared above, dried, and rolled with a rolling pressure of 1 MPa to obtain the positive electrode sheet of the lithium-ion battery. The thickness of the ceramic coating was 100 μm.

[0051](2) The same method as in Example 1 was used to pre...

Embodiment 3

[0065] (1) The same method as in Example 1 was used to prepare the positive electrode active material pole sheet of the lithium ion battery, except that the positive electrode active material used was lithium cobaltate.

[0066] Apply ceramic coating:

[0067] Lithium metaaluminate ceramic powder, zirconia ceramic powder, binder polyvinylidene fluoride, and solvent N-methylpyrrolidone are formulated into a ceramic slurry, and the parts by mass are: 3 parts of lithium metaaluminate ceramic powder, 2 parts of zirconia ceramic powder, 1 part of polyvinylidene fluoride, 30 parts of N-methylpyrrolidone (wherein the maximum particle diameter of lithium metaaluminate ceramic powder and zirconia ceramic powder is 100 μm); then the prepared The ceramic slurry was uniformly coated on the positive electrode sheet of the active material prepared above, dried, and rolled with a rolling pressure of 0.9 MPa. The thickness of the ceramic coating is 100 μm, and the position of the ceramic coa...

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Abstract

The invention discloses a lithium ion battery pole piece, which comprises a current collector, an active material layer uniformly coated on the current collector and a ceramic coating uniformly coatedon the active material layer, wherein the ceramic coating contains lithium metaaluminate ceramic powders. The invention also discloses a manufacturing method of the lithium ion battery pole piece. The method comprises the following steps: step 1) uniformly coating the active substance material slurry on the current collector, and carrying out drying and rolling to obtain an active substance polepiece; and 2) preparing ceramic slurry from ceramic powders, binders and solvents in parts by mass: 5-50 parts of ceramic powders, 1-5 parts of binders and 30-60 parts of solvent; and then, coating the prepared ceramic slurry on the active substance pole piece obtained in the step 1) and carrying out drying and rolling. According to the lithium ion battery pole piece disclosed by the invention, onthe premise of ensuring energy density and electrochemical performance of a battery, the absorption speed and the liquid retention capacity of the pole piece are improved, and meanwhile, the cycle performance and the safety performance of the lithium ion battery are also improved.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a lithium ion battery pole piece and a manufacturing method thereof. Background technique [0002] The sustainable development of the economy and the requirements of an environment-friendly society impel us to vigorously develop clean energy. At present, petrochemical energy occupies the main body of my country's energy structure. On the one hand, my country’s energy demand is strong. On the other hand, petrochemical energy is a non-renewable energy, and the application of petrochemical energy has brought many environmental problems. This makes us need to vigorously develop green energy such as electrochemical energy storage while optimizing the energy structure. Environmentally friendly energy system. Lithium-ion batteries have been commercialized for nearly 30 years, and have made considerable progress in terms of electrochemical performance and safety. However, lithium-io...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/66H01M4/131H01M10/0525H01M4/62
CPCH01M4/667H01M4/131H01M10/0525H01M4/62Y02E60/10
Inventor 张飞段士涛牛壮壮常武杰
Owner 河南平煤国能锂电有限公司
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