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Negative pole piece and battery

A technology of negative pole piece and negative film piece, applied in the field of negative pole piece and battery, can solve the problems affecting battery cycle life and safety, and achieve the effect of excellent kinetic performance and long cycle life.

Active Publication Date: 2020-08-28
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 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 quickly charged. safety

Method used

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  • Negative pole piece and battery
  • Negative pole piece and battery
  • Negative pole piece and battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] (1) Preparation of positive pole piece

[0038] The positive electrode active material (see Table 1 for details), the conductive agent acetylene black, and the binder polyvinylidene fluoride (PVDF) are mixed in a weight ratio of 96:2:2, and the solvent N-methylpyrrolidone (NMP) is added. Stir under the action of a mixer until the system is uniform to obtain a positive electrode slurry; evenly coat the positive electrode slurry on the positive electrode current collector aluminum foil, dry at room temperature and transfer to an oven to continue drying, and then cold press and slit to obtain positive electrode pieces .

[0039] (2) Preparation of negative pole piece

[0040] The negative active material (see Table 1 for details), the conductive agent acetylene black, the thickener sodium carboxymethyl cellulose (CMC), and the binder styrene butadiene rubber (SBR) are mixed in a weight ratio of 96.4:1:1.2:1.4 , Add solvent deionized water, stir under the action of a vacuum mixe...

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PUM

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Abstract

The present invention provides a negative electrode piece and a battery. The negative electrode piece includes a negative electrode current collector and a negative electrode film piece disposed on at least one surface of the negative electrode current collector and including a negative electrode active material, and the negative electrode film piece satisfies: 6.0≤ PD×Dv50≤32.0 and 0.2≤PD / Dn10≤12.0. The negative electrode sheet of the present invention has excellent kinetic performance, and the battery of the present invention has both excellent kinetic performance and long cycle life.

Description

Technical field [0001] The invention relates to the field of batteries, in particular to a negative pole piece and a battery. Background technique [0002] Rechargeable batteries have outstanding characteristics 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, electric tools and other fields. Among them, the charging time is increasingly being 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 improve the speed of ion movement between the positive and negative electrodes through chemical system coordination and design optimization. If the negative electrode cannot withstand high-current charging, the ions will be directly reduced and precipitated on the negative electrode surface instead of being embedded in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/13H01M10/0525
CPCH01M4/13H01M10/0525Y02E60/10H01M2004/027H01M2004/021H01M4/386H01M4/387H01M4/587H01M4/485H01M4/134H01M4/133H01M4/131
Inventor 王家政申玉良康蒙何立兵朱宝健陈雷
Owner CONTEMPORARY AMPEREX TECH CO