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Positive electrode material, positive electrode pole piece prepared from the same and obtained lithium ion battery

A lithium-ion battery, cathode material technology, applied in electrode manufacturing, battery electrodes, secondary batteries, etc., can solve problems such as poor safety and cycle performance, achieve high rate performance, maintain integrity, and reduce stress.

Active Publication Date: 2019-11-22
东莞维科电池有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the cell capacity obtained by the method is high, its safety and cycle performance are relatively poor.

Method used

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  • Positive electrode material, positive electrode pole piece prepared from the same and obtained lithium ion battery
  • Positive electrode material, positive electrode pole piece prepared from the same and obtained lithium ion battery
  • Positive electrode material, positive electrode pole piece prepared from the same and obtained lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0087] (1) Preparation of modified superconducting carbon black: Superconducting carbon black (Cabot LTIX300) with a particle size of 50nm and elemental red phosphorus with a particle size of 8nm are carried out at a mass ratio of 1:3 at a speed of 300r / min The ball mill was mixed for 12 hours, sieved with 300 mesh, and heat-treated at 350°C for 9.5 hours to obtain modified superconducting carbon black;

[0088] (2) Positive electrode sheet preparation: LiNi with a mass content of 96% 0.6 co 0.2 mn 0.2 o 2 , 1.8% modified superconducting carbon black, 1.2% carbon nanotubes and 1.0% polyvinylidene fluoride are mixed with NMP, coated on the surface of aluminum foil, dried at 120°C, and rolled to obtain an areal density of 100g / m 2 positive pole piece;

[0089] (3) Negative electrode sheet preparation: Dissolve graphite, SP, dispersant (CMC), and binder (SBR) in deionized water according to the ratio of 95:2:1.5:1.5, and stir for 10 hours to make them uniformly dispersed. Co...

Embodiment 2

[0092] (1) Preparation of modified superconducting carbon black: Superconducting carbon black (Cabot LTIX300) with a particle size of 30nm and elemental red phosphorus with a particle size of 4nm are carried out at a mass ratio of 1:3.2 at a speed of 500r / min The ball mill was mixed for 8 hours, sieved with 600 mesh, and heat-treated at 600°C for 9 hours to obtain modified superconducting carbon black;

[0093] (2) Positive electrode sheet preparation: LiNi with a mass content of 94% 0.6 co 0.2 mn 0.2 o 2 , 1.5% modified superconducting carbon black, 3% carbon nanotubes and 1.5% binder mixed, coated on the surface of aluminum foil, dried at 80°C, and rolled to obtain an areal density of 80g / m 2 positive pole piece;

[0094] (3) Preparation of lithium-ion battery: 20 positive electrode sheets, 21 sheets of which are 50g / m 2 Negative electrode pole piece, electrolyte and porosity of 43% dry-process diaphragm packaging, 46 ℃ for 20h, to obtain lithium-ion batteries, ethylene...

Embodiment 3

[0097] The difference from Example 1 is that the heat treatment temperature in step (1) is 300°C.

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Abstract

The invention relates to a positive electrode material, a positive electrode pole piece prepared from the positive electrode material and an obtained lithium ion battery. The positive electrode material comprises a positive electrode active material, modified superconducting carbon black and carbon nanotubes. The modified superconductive carbon black and the carbon nanotubes are used as a conductive agent together to prepare the positive electrode material, so that the conductivity of the positive electrode material is improved, rapid intercalation and deintercalation of lithium ions under thecondition of high-rate charge and discharge are facilitated, the cycle performance of the battery is improved, and the rapid and long-acting use characteristic of the lithium ion battery is realized.The lithium ion battery assembled by the positive electrode material has good energy density, cycle performance, rapid charging performance and relatively long service life.

Description

technical field [0001] The invention belongs to the technical field of battery materials, and in particular relates to a positive electrode material, a positive electrode sheet prepared therefrom, and a lithium ion battery obtained. Background technique [0002] Lithium-ion batteries are widely used in 3C digital products, electric vehicles, military aerospace and other fields due to their high working voltage, high energy density, long cycle life, and environmental friendliness. With the popularization of smart digital products, the application of new energy vehicles is becoming more and more extensive, and people's demand for fast charging is more urgent. Shortening the charging time can improve user experience. Fast charging technology is an important direction for the development of battery cells in the future. [0003] However, the charging time of batteries currently on the market is long (2 hours for mobile phones, more than 6 hours for electric vehicles), which cause...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M10/0567H01M10/0569H01M4/1391H01M4/1397H01M4/04H01M10/0525
CPCH01M4/625H01M10/0567H01M10/0569H01M4/1391H01M4/1397H01M4/0404H01M10/0525H01M2300/0025H01M2300/0028H01M2300/0037Y02E60/10
Inventor 桂亚林李掌权占克军夏小勇王恒朱坤庆计阳楚英张涛
Owner 东莞维科电池有限公司
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