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Secondary battery

A secondary battery and electrolyte technology, applied in secondary batteries, battery electrodes, non-aqueous electrolyte batteries, etc., can solve problems such as limiting the rapid popularization of rechargeable batteries, and achieve rapid charge and discharge capabilities, long cycle life, and high energy density. Effect

Active Publication Date: 2019-03-22
CONTEMPORARY AMPEREX TECH CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In addition, for rechargeable batteries, their output power, that is, the rapid discharge capability of batteries, is also an important factor limiting the rapid popularization of rechargeable batteries

Method used

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  • Secondary battery

Examples

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Effect test

Embodiment 1

[0033] (1) Preparation of positive pole piece

[0034] Mix the positive electrode active material (see Table 1 for details), conductive agent Super P, and binder polyvinylidene fluoride (PVDF) at a mass ratio of 96:2:2, add solvent N-methylpyrrolidone (NMP), and vacuum Stir under the action of a mixer until the system is uniform to obtain the positive electrode slurry; evenly coat the positive electrode slurry on the aluminum foil of the positive electrode current collector, and then transfer the positive electrode current collector coated with the positive electrode slurry to an oven after drying at room temperature Drying, then cold pressing and slitting to obtain the positive electrode sheet.

[0035] (2) Preparation of negative pole piece

[0036] Mix the negative electrode active material (see Table 1 for details), conductive agent Super P, thickener sodium carboxymethylcellulose (CMC), and binder styrene-butadiene rubber (SBR) at a mass ratio of 94.5:1.5:1.5:2.5 , add ...

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Abstract

The invention provides a secondary battery. The secondary battery comprises a positive pole piece, a negative pole piece, electrolyte and an isolating membrane, wherein the positive pole piece comprises a positive current collector and a positive diaphragm which is arranged on at least one surface of the positive current collector and comprises an positive active material; the negative pole piececomprises a negative current collector and a negative diaphragm which is arranged on at least one surface of the negative current collector and comprises a negative active material. The secondary battery also meets the following condition that a ratio of the product of D50 negative electrode and M negative electrode to the product of D50 positive electrode plus 4 and M negative electrode plus 4 isgreater than or equal to 0.1 and is smaller than or equal to 1.5. The secondary battery with the advantages of long cycle life, high energy density and quick charge and discharge capacity, provided by the invention, is obtained by reasonably matching a relationship between particle sizes of the positive and negative active materials and capacities of the positive and negative diaphragms.

Description

technical field [0001] The invention relates to the field of batteries, in particular to a secondary battery. Background technique [0002] Rechargeable batteries have outstanding features such as light weight, high energy density, no pollution, no memory effect, and long service life, so they are widely used in mobile phones, computers, household appliances, power tools and other fields. Among them, charging time is increasingly valued by end consumers, and it is also an important factor limiting the popularity of rechargeable batteries. In terms of technical principles, the key to determining the charging speed of a rechargeable battery is the negative electrode. [0003] In addition, for rechargeable batteries, the output power, that is, the rapid discharge capability of batteries, is also an important factor limiting the rapid popularization of rechargeable batteries. In terms of technical principles, the key to determining the output power of a rechargeable battery is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0525H01M4/13H01M10/058
CPCH01M4/13H01M10/0525H01M10/058H01M2004/021Y02E60/10Y02P70/50
Inventor 王家政申玉良康蒙何立兵朱宝健徐守江
Owner CONTEMPORARY AMPEREX TECH CO
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