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A method for supplementing lithium by radiation and the electrode, winding core and battery it includes

A lithium battery, lithium ion battery technology, applied in secondary batteries, non-aqueous electrolyte battery electrodes, circuits, etc., can solve the problems of safety accidents and high chemical activity of metal lithium, and achieve improved safety, uniform lithium replenishment, and flexible timing. Effect

Active Publication Date: 2021-10-08
SHANGHAI RUIPU ENERGY CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the existing lithium supplementation methods are realized by adding metal lithium powder or metal foil to the positive or negative electrode, but the chemical activity of metal lithium is too high, which may easily cause safety accidents in the production process

Method used

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  • A method for supplementing lithium by radiation and the electrode, winding core and battery it includes

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Preparation of positive electrode sheet for lithium ion battery:

[0039] Mix the positive electrode active material lithium iron phosphate, conductive carbon, and binder PVDF in the solvent NMP according to the mass ratio of 95:3:2, and stir evenly to obtain the positive electrode slurry. The obtained positive electrode slurry is coated on a 13 μm aluminum foil, dried, and cold pressed to obtain a compacted density of 2.35 g / cm 3 The pole piece is then die-cut to obtain the positive pole piece.

[0040] Preparation of lithium ion battery negative electrode sheet:

[0041] Add the negative electrode active material natural graphite, lithium-containing precursor lithium carbonate, conductive carbon, thickener CMC, and binder SBR into the solvent deionized water according to the mass ratio of 95:1.9:1:2:2 (the additive dosage in this embodiment 2%), after mixing evenly, the negative electrode slurry is obtained, and then the negative electrode slurry is coated on both s...

Embodiment 2

[0048] The difference from Example 1 is that the addition position of the lithium-containing additive is the positive electrode:

[0049] Preparation of positive electrode sheet for lithium ion battery:

[0050] Mix the positive electrode active material lithium iron phosphate, lithium-containing precursor lithium carbonate, conductive carbon, and binder PVDF in the solvent NMP according to the mass ratio of 95:1.9:3:2, and stir evenly to obtain the positive electrode slurry. The obtained positive electrode slurry is coated on a 13 μm aluminum foil, dried, and cold pressed to obtain a compacted density of 2.35 g / cm 3 The pole piece is then die-cut to obtain the positive pole piece.

[0051] Preparation of lithium ion battery negative electrode sheet:

[0052] Add the negative electrode active material natural graphite, conductive carbon, thickener CMC, and binder SBR into the solvent deionized water according to the mass ratio of 95:1:2:2. After mixing evenly, the negative e...

Embodiment 3

[0059] The difference from Example 2 is that the addition position of the lithium-containing additive is that both the positive electrode and the negative electrode are added:

[0060] Preparation of positive electrode sheet for lithium ion battery:

[0061] Mix the positive electrode active material lithium iron phosphate, lithium-containing precursor lithium carbonate, conductive carbon, and binder PVDF in the solvent NMP according to the mass ratio of 95:1.9:3:2, and stir evenly to obtain the positive electrode slurry. The obtained positive electrode slurry is coated on a 13 μm aluminum foil, dried, and cold pressed to obtain a compacted density of 2.35 g / cm 3 The pole piece is then die-cut to obtain the positive pole piece.

[0062] Add the negative electrode active material natural graphite, lithium-containing precursor lithium carbonate, conductive carbon, thickener CMC, and binder SBR into the solvent deionized water according to the mass ratio of 95:1.9:1:2:2 (the add...

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Abstract

The invention provides a method for supplementing lithium by radiation and the electrodes, winding cores and batteries it includes; the method uses electron beam (EB) irradiation or γ-ray irradiation to reduce or induce lithium supplement precursors in pole pieces to generate metallic lithium , so as to realize lithium supplementation to the battery, and relates to the field of lithium ion batteries. The invention supplements lithium to the battery by means of irradiation in situ induction, avoids the direct addition of lithium powder or lithium foil, and improves the safety of the lithium supplementation process. At the same time, the method of the present invention can be used for continuous production, and the degree of lithiation is controllable, the lithiation is uniform, and the method is simple and convenient.

Description

technical field [0001] The invention relates to the technical field of lithium battery manufacturing, in particular to a method for supplementing lithium by radiation and an electrode, a core and a battery included therein; a radiation-based method for supplementing lithium in a lithium-ion battery and an electrode, a core and a battery included therein Battery. Background technique [0002] Lithium-ion batteries have greatly promoted the development of various fields since their invention. However, with the rapid development of modern science and technology and the continuous improvement of use requirements, electronic products and new energy vehicles have put forward higher requirements for lithium-ion batteries. Therefore, it is more urgent to develop lithium-ion batteries with higher energy density, higher power density, longer service life and safer. [0003] In the manufacturing process of lithium-ion batteries, a large amount of active lithium ions will be consumed ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0587H01M10/0525H01M4/13
CPCH01M4/13H01M10/0525H01M10/0587Y02E60/10Y02P70/50
Inventor 胡亦杨刘微张亦弛刘婵侯敏曹辉
Owner SHANGHAI RUIPU ENERGY CO LTD
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