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Secondary battery

A secondary battery and electrolyte technology, applied in secondary batteries, battery electrodes, circuits, etc., can solve problems such as the decline in the effective transmission capacity of ions and electrons

Pending Publication Date: 2022-02-25
ZHUHAI COSMX BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to improve the secondary battery in the prior art during the charging and discharging process of the continuous generation and consumption of solid interface film, the effective transport capacity of ions and electrons inside the pole piece is reduced, etc., the invention provides an additive and containing the Additives for lithium-ion batteries

Method used

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Examples

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preparation example Construction

[0099]

[0100]The present invention also provides a method for preparing the above-mentioned negative electrode sheet, the method comprising the following steps:

[0101] The solvent, the negative electrode active material, the conductive agent, the binder and the additive are uniformly mixed to prepare the negative electrode slurry; the negative electrode slurry is coated on the surface of the negative electrode current collector and dried to prepare the negative electrode sheet.

[0102] In one solution of the present invention, the negative electrode slurry contains 150-350 parts by mass of solvent, 73-98.5 parts by mass of negative electrode active material, 0.5-15 parts by mass of conductive agent, 0.001-2 parts by mass of additives, 0.999-10 parts by mass of binder.

[0103] In one embodiment of the present invention, the solvent is at least one selected from water, acetonitrile, benzene, toluene, xylene, acetone, tetrahydrofuran, hydrofluoroether, and N-methylpyrroli...

Embodiment 1

[0140] 1) Preparation of positive pole piece:

[0141] Mix 96g positive electrode active material nickel-cobalt-manganese ternary material (NCM811), 1.5g binder polyvinylidene fluoride (PVDF), 1.5g conductive carbon black, 1g conductive carbon nanotubes, add 150g N-methyl Pyrrolidone (NMP) was stirred under the action of a vacuum mixer until the mixed system formed a positive electrode slurry with uniform fluidity; the positive electrode slurry was uniformly coated on an aluminum foil with a thickness of 13 μm; after being dried at 100°C for 36 hours, pumping The pole piece is obtained after vacuum treatment, and the pole piece is rolled and cut to obtain the positive pole piece;

[0142] 2) Preparation of negative pole piece:

[0143] 50g natural graphite, 23g silicon oxide, 10g conductive agent single-walled carbon nanotube (SWCNT), 5g conductive agent conductive carbon black (SP), 2g diethyl diallylmalonate, 4g binder carboxymethyl Base cellulose sodium (CMC), 6g binder s...

Embodiment 2-6

[0152] Embodiment 2-6 and other comparative examples

[0153] The specific processes of Examples 2-6 and other comparative examples refer to Example 1. The main differences are the process conditions of the negative electrode sheet, the amount of each component added, and the type of each component material. See Table 1 and Table 2 for details.

[0154] The composition of the negative pole sheet of table 1 embodiment and comparative example

[0155]

[0156]

[0157] The composition of the negative pole sheet of table 2 embodiment and comparative example

[0158]

[0159] Carry out performance test to the battery that above-mentioned embodiment and comparative example prepare:

[0160] (1) Battery internal resistance AC impedance test method: use Metrohm Swiss Metrohm PGSTAT302N chemical workstation in the range of 100KHz-0.1mHz, 25°C to conduct AC impedance test on 50% SOC lithium-ion battery, the test results are listed in Table 3 .

[0161] The battery internal ...

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Abstract

The invention provides a secondary battery, at least one of a positive pole piece, a negative pole piece and an electrolyte of the secondary battery comprises an additive with small molecular weight and short molecular chain segment, and the additive can be fully mixed with an active substance, a conductive agent and a binder in the positive pole piece and the negative pole piece. And the additive can be in full contact with each component in the positive electrode and the negative electrode and is immersed into internal pores of the pole piece. In addition, the additive has good compatibility with electrolyte components in the electrolyte, and can be easily dissolved in the electrolyte within the addition amount of the additive. The additive can form a film on the surfaces of positive and negative active substances, can effectively improve the composition of a solid electrolyte film on the surfaces of the positive and negative active substances, improves the content of polymer components in a solid interface film, improves the conduction of electrons and lithium ions in positive and negative pole pieces of the battery, and enhances the dynamics of lithium ions in the pole pieces. The internal resistance of the battery in the cycle process is prevented from increasing and the cycle life is prolonged.

Description

technical field [0001] The invention belongs to the technical field of secondary batteries, and relates to a secondary battery, in particular to a secondary battery containing an additive. Background technique [0002] Lithium-ion batteries have been widely used in power vehicles, energy storage, drones, notebook computers, mobile phones, cameras and other products. The current commercial lithium-ion batteries are mainly composed of positive electrodes, negative electrodes, separators and electrolytes. Lithium-ion negative electrode materials are particularly important as an important component of lithium-ion batteries. [0003] During the first charge and discharge process of a conventional secondary battery, a solid interface film will be formed on the surface of the positive and negative electrodes. The formed interface film directly affects the effective transmission of ions and electrons inside the pole piece. How to effectively improve the composition of the interface ...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M10/056H01M10/0525
CPCH01M4/62H01M10/056H01M10/0525Y02E60/10
Inventor 唐伟超李素丽赵伟刘春洋
Owner ZHUHAI COSMX BATTERY CO LTD
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