secondary battery

A secondary battery and electrolyte technology, applied to secondary batteries, battery electrodes, circuits, etc., can solve problems affecting battery cycle life and safety, and achieve long cycle life and fast charging capabilities

Active Publication Date: 2021-01-15
CONTEMPORARY AMPEREX TECH CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the negative electrode cannot withstand high-current charging, the active ions will be directly reduced and precipitated on the surface of the negative electrode instead of being embedded in the active material of the negative electrode when the battery is rapidly charged. and security

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0038] (1) Preparation of positive pole piece

[0039] 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, dry at room temperature, transfer to an oven to continue drying, and then cold press and cut to obtain the positive electrode sheet .

[0040] (2) Preparation of negative pole piece

[0041] After mixing the negative electrode active material (see Table 1 for details), conductive agent Super P, thickener sodium carboxymethylcellulose (CMC), and binder styrene-butadiene rubber (SBR) in a mass ratio of 96.4:1:1.2:1.4 , add the solvent deionized water, stir under the action of a vacuum mixer until the syste...

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Abstract

The secondary battery provided in the present invention comprises a positive electrode pole, a negative electrode pole, an insulating film, and an electrolyte, the negative electrode pole comprising a negative electrode current collector and a negative electrode film that is arranged on at least one surface of the negative electrode current collector and comprises a negative electrode active material. The secondary battery further satisfies the following: 2.90≤α≤5.10 and 0.08≤β≤0.55, wherein α=8×P+1.2×A, P representing the porosity of the negative electrode film, A representing the excess coefficient for battery capacity, and wherein β=D50 / H, D50 representing the particle size when the total volume percentage of the negative active material reaches 50%, and H representing the thickness of the negative electrode membrane, the unit used for D50 and H being µm. In the present invention, by matching the porosity of the negative electrode film, the excess coefficient for battery capacity, the particle size of the negative electrode active material, and the thickness of the negative film, a rapid-charge capability and a long cycle life may be achieved without sacrificing the energy density of the secondary battery.

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. They are currently 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. [0003] In terms of technical principles, the core of battery fast charging technology is to increase the movement speed of active ions between the positive and negative electrodes through chemical system coordination and design optimization. If the negative electrode cannot withstand high-current charging, the active ions will be directly reduced and precipitated on the surface of the negative electrode instead of being embedded i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/66H01M4/70H01M4/38H01M10/0525H01M10/054
CPCH01M4/38H01M4/667H01M4/70H01M10/0525H01M10/054Y02E60/10
Inventor 申玉良康蒙王家政何立兵
Owner CONTEMPORARY AMPEREX TECH CO
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