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Positive pole piece of lithium ion secondary battery and preparation method thereof

A technology for secondary batteries and positive pole pieces, applied to battery electrodes, non-aqueous electrolyte battery electrodes, circuits, etc., can solve the problems of slow particle diffusion, achieve the effects of improving wettability, improving first-time efficiency, and improving cycle performance

Active Publication Date: 2016-02-10
NINGDE AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Another object of the present invention is to provide a positive pole piece of a lithium-ion secondary battery and a preparation method thereof, which can solve the problem that the electrolyte passes through the solid-liquid interface of the positive pole piece and the electrolyte from the liquid phase to the particles inside the positive pole piece when the temperature is low. The problem of slow diffusion and can reduce the polarization internal resistance of lithium-ion secondary batteries discharged at low temperature

Method used

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  • Positive pole piece of lithium ion secondary battery and preparation method thereof
  • Positive pole piece of lithium ion secondary battery and preparation method thereof

Examples

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preparation example Construction

[0025] According to the preparation method of the positive electrode sheet of the lithium ion secondary battery according to the second aspect of the present invention, it is used to prepare the positive electrode sheet of the lithium ion secondary battery according to the first aspect of the present invention, comprising the following steps: Mix the composite metal oxide active material, conductive agent, binder and solvent to prepare the bottom layer slurry; apply the bottom layer slurry on the surface of the positive electrode current collector 1, and evaporate the solvent for coating the bottom layer slurry to form a layer covered with bottom layer slurry. The bottom pole piece of layer 2; mix the supercapacitor carbon material, conductive agent, adhesive and solvent to prepare the top layer slurry; apply the top layer slurry on the surface of the bottom pole piece, evaporate the solvent of the top layer slurry to form a covering A top-layer pole piece with a top-layer coat...

Embodiment 1

[0028] Preparation of positive pole piece

[0029] First bottom pole piece: take binder polyvinylidene fluoride (PVDF) and dissolve in solvent N-methylpyrrolidone (NMP), fully dissolve until the solution is clear; Conductive carbon (supper-P) and nickel cobalt lithium manganese oxide (NCM) is added in the above solution, and mixed into a slurry, wherein the solid mass ratio of NCM, supper-P and PVDF is 94:3:3, and the solid content of the slurry solution is 70%; the slurry is coated on On a blank aluminum foil current collector (positive current collector) with a thickness of 16 μm, the solvent is completely evaporated after baking in an oven, and the thickness of the coating on the front and back sides is 70 μm, and the bottom electrode sheet covered with the bottom coating is obtained;

[0030] Next, prepare the top pole piece of the positive pole piece: the specific surface is 1300m 2 / g activated carbon fiber mixed with conductive carbon (supper-P), then add the adhesive ...

Embodiment 2

[0037] Preparation of the positive pole piece: the remaining parts are the same as the steps of preparing the positive pole piece in Example 1, the difference is that the specific surface of the supercapacitor carbon material used for the top coat is 2000m 2 / g; the thickness of the pole piece after compaction is 113μm.

[0038] The preparation of the negative electrode sheet and the preparation of the lithium-ion secondary battery are the same as in Example 1.

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Abstract

The invention provides a positive pole tab of a lithium ion secondary battery and a preparation method of the positive pole tab. The positive pole tab of the lithium ion secondary battery comprises a positive pole current collector, a bottom layer coating and a top layer coating, wherein the bottom layer coating covers the upper surface of the positive pole current collector, and contains a lithium composite metal oxide active material, a conductive agent and a bonding agent; and the top layer coating covers the positive pole current collector, is compacted on the positive pole current collector together with the bottom layer coating, and contains a super-capacitor carbon material, a conductive agent and a bonding agent. The positive pole tab of the lithium ion secondary battery and the preparation method of the positive pole tab provided by the invention have the beneficial effects that under the precondition of not reducing the volume energy density, the wettability of the positive pole tab with electrolyte can be obviously improved, and thus the utilization ratio of the positive pole active material is increased, so that the first-time efficiency is increased and the cycle performance can be obviously improved.

Description

technical field [0001] The invention relates to a lithium ion secondary battery, in particular to a positive pole piece of the lithium ion secondary battery and a preparation method thereof. Background technique [0002] Due to the advantages of high volume energy density and mass energy density, long life, low self-discharge, and environmental protection, lithium-ion secondary batteries are widely used in portable electronic equipment such as mobile communication equipment, notebook computers, and electric vehicles. [0003] With the rapid development of consumer electronics and electric vehicles, the performance requirements for lithium-ion secondary batteries are getting higher and higher, especially when the volumetric energy density is greatly improved, and it is necessary to maintain a certain low-temperature discharge performance and cycle performance. . The higher the volume energy density requires more energy in a limited space, so based on the existing active mate...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/13H01M4/139
CPCY02E60/10
Inventor 邹武元
Owner NINGDE AMPEREX TECH