Composite cathode material for lithium ion power and energy storage battery and preparation method thereof and battery

A technology of energy storage battery and negative electrode material, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as low specific energy, and achieve the effects of easy operation, low cost, and simple preparation process

Active Publication Date: 2010-12-15
JIXI BTR GRAPHITE IND PARK CO LTD +2
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, lithium-ion batteries have the characteristics of high energy density, long life, environmental protection, and lightness, and can solve the two world problems of "energy" and "environmental protection" at the same time. The power and energy storage batteries of the prior art use graphite as the negative electrode of the battery material whose specific energy is low

Method used

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  • Composite cathode material for lithium ion power and energy storage battery and preparation method thereof and battery
  • Composite cathode material for lithium ion power and energy storage battery and preparation method thereof and battery
  • Composite cathode material for lithium ion power and energy storage battery and preparation method thereof and battery

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preparation example Construction

[0023] The preparation method one of composite negative electrode material for lithium ion power and energy storage battery of the present invention comprises the following steps:

[0024] 1. Mixing, according to the mass ratio, the carbon material is composed of 15-85% hard carbon, 15-85% natural graphite and / or artificial graphite. The natural graphite and artificial graphite are in any proportion, and the carbon material, dispersant and water According to the mass ratio of 1:0.1~0.5:1~5, the F-0.4 high-speed disperser of Changzhou Wujin Bafang Machinery Factory is used, and the rotation speed is 1000~3000r / min, and the mixture is mixed for 3~10 hours to obtain the mixture.

[0025] 2. Drying. Put the mixture directly into the DHG-9140 high-temperature test chamber of Guangzhou Dongzhixu Test Equipment Co., Ltd., dry it at 80-140°C for 10-36 hours, and cool it down to room temperature naturally to obtain the improved precursor. .

[0026] 3. Heat treatment. Put the improved...

Embodiment 1-8

[0038] Examples 1-8, the proportion of raw materials used in the preparation of composite negative electrode materials for lithium ion power and energy storage batteries are shown in Table 1, the process parameters are shown in Table 2, and the structural properties of the materials are shown in Table 3.

[0039] The lithium ion power and energy storage battery of the present invention is composed of a battery casing, a negative electrode, a positive electrode, an electrolyte and a diaphragm.

[0040] According to mass ratio, the negative electrode material is composed of 2-5% of binder, 90-95% of negative electrode material and 3-5% of conductive agent.

[0041] The binder is polyvinylidene fluoride or polytetrafluoroethylene.

[0042] The negative electrode material adopts the composite negative electrode material for lithium ion power and energy storage battery of the present invention.

[0043] The conductive agent is conductive carbon black, acetylene black, conductive g...

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Abstract

The invention discloses a composite cathode material for a lithium ion power and energy storage battery and a preparation method thereof and a battery, which aims to solve the technical problem of improving high rate discharge performance of the battery. The composite cathode material is made up of composite particles obtained by combining hard carbon with natural graphite or the hard carbon with artificial graphite or the hard carbon with the natural graphite and the artificial graphite. The preparation method comprises the following steps: mixing the hard carbon and the natural graphite and/or the artificial graphite with a dispersant and water to obtain a mixture, drying and carrying out thermal treatment on the mixture to obtain the composite cathode material. The battery of the invention adopts the cathode material. Compared with the prior art, the first specific capacity of a battery cathode is more than 489.3mAh/g, capacity retention rate at 1C after 300 cycles is more than 95% at high temperature of 60 DEG C, and capacity retention rate at 1C after 300 cycles is more than 86% at low temperature of minus 30 DEG C. The composite cathode material has simple preparation process and low cost, and the cathode material is suitable for the lithium ion power and energy storage battery and the lithium ion battery for various portable devices, electric tools and electric motor cars.

Description

technical field [0001] The invention relates to a negative electrode material of a battery and a preparation method thereof, and a battery using the material, in particular to a composite negative electrode material of a lithium ion battery, a preparation method thereof, and a battery using the material. Background technique [0002] With the development of science and technology and the improvement of living standards, human demand for energy has increased significantly, while the storage of fossil energy such as coal, oil, and natural gas is limited. The development and utilization of energy systems of renewable resources and the adjustment of energy structures have become human society. problems that urgently need to be resolved. Power batteries for electric vehicles used in the prior art mainly include: lead-acid batteries, nickel-cadmium batteries, nickel-metal hydride batteries and lithium-ion batteries. Among them, lithium-ion batteries have the characteristics of hi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38H01M4/133H01M4/1391
CPCY02E60/122Y02E60/10
Inventor 岳敏闫慧青邓明华汪福明陈春天贺雪琴
Owner JIXI BTR GRAPHITE IND PARK CO LTD
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