Lithium ion battery

A lithium-ion battery and conductive agent technology, applied in battery electrodes, secondary batteries, secondary battery charging/discharging, etc., can solve problems such as thermal failure of lithium-ion batteries, achieve thermal failure, reduce heat release, and improve safety performance effect

Active Publication Date: 2017-01-04
CONTEMPORARY AMPEREX TECH CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the problems existing in the background technology, the object of the present invention is to provide a lithium ion battery, which effectively solves the problem that the lithium carbonate in the positive electrode sheet undergoes a side reaction under high temperature conditions and causes the thermal failure of the lithium ion battery , while lithium-ion batteries have good overcharge resistance

Method used

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Examples

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Embodiment 1

[0029] (1) Preparation of the positive pole piece: the positive active material lithium nickel cobalt manganese LiNi 1 / 3 co 1 / 3 mn 1 / 3 , the positive electrode additive lithium carbonate, the conductive agent Super P, and the binder polyvinylidene fluoride (PVDF) are mixed with the solvent N-methylpyrrolidone (NMP) at a mass ratio of 95.06:1.94:1.4:1.6 to make a positive electrode slurry. After that, evenly coat the positive electrode slurry on the current collector aluminum foil and dry it at 85°C, then cold press it, then trim, cut into pieces, and divide into strips, then dry it under vacuum at 85°C for 4 hours, and then weld The tabs are used to complete the preparation of the positive pole piece.

[0030] (2) Preparation of negative pole piece: Negative active material graphite, conductive agent Super P, thickener CMC and binder SBR are mixed with solvent deionized water at a mass ratio of 97:1:1:1 to make negative electrode slurry After that, evenly coat the negative ...

Embodiment 2

[0034] A lithium ion battery was prepared with reference to the method of Example 1, except that the mass ratio of lithium nickel cobalt manganese, lithium carbonate, Super P and PVDF in the positive electrode slurry was 96.03:0.97:1.4:1.6.

Embodiment 3

[0036] A lithium ion battery was prepared with reference to the method of Example 1, except that the mass ratio of lithium nickel cobalt manganese, lithium carbonate, Super P and PVDF in the positive electrode slurry was 94.09:2.91:1.4:1.6.

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Abstract

The invention provides a lithium ion battery. The lithium ion battery comprises a positive pole piece, a negative pole piece, an isolating film spaced between the positive pole piece and the negative pole piece, and an electrolyte solution. A positive electrode film piece also includes a positive electrode additive; the positive electrode additive is lithium carbonate; the electrolyte solution also includes an electrolyte solution additive; the electrolyte solution additive includes flavonoids and has the following chemical formula described in the specification, wherein H at 3, 5, 6, 7, 8, 1', 2', 3', 4' and 5' sites is independently substituted by functional groups substituted by phenolic hydroxyl, hydroxyl, alkyl, alkoxy, carboxyl, amino, aryl or halogen. The lithium ion battery effectively solves the problem of thermal failure of a lithium ion battery caused by side reactions of lithium carbonate in a positive pole piece under a condition of high temperature, and at the same time, the lithium ion battery has relatively good overcharge resistant performance.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a lithium ion battery. Background technique [0002] When the lithium-ion battery is fully charged and continues to be charged and overcharge occurs, the positive and negative electrodes of the lithium-ion battery will be in an "overloaded" state, so a series of side reactions will occur. At the positive electrode, the non-aqueous organic solvent in the electrolyte is easily oxidized when the potential rises, and the heat released by the oxidation reaction of the non-aqueous organic solvent due to overcharging is much higher than the oxidation of the non-aqueous organic solvent under normal charge and discharge conditions. The heat released by the reaction; at the negative electrode, the intercalation reaction of lithium ions will continue, causing lithium ions to easily deposit on the surface of the negative electrode. These abnormal reactions will cause the performance of li...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/44H01M4/62
CPCH01M4/62H01M10/443Y02E60/10
Inventor 许寒雪蒋玉雄张明付成华
Owner CONTEMPORARY AMPEREX TECH CO
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