Lithium ion battery positive-electrode composite material and lithium ion battery

一种锂离子电池、复合材料的技术，应用在锂离子电池正极复合材料及锂离子电池领域，能够解决正极活性物质稳定性的改进问题没有得到很好的解决等问题，达到良好锂离子传导能力、抑制副反应、好倍率性能的效果

Active Publication Date: 2014-04-02
TSINGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the problem of improving the stability of the positive electrode active material during battery cycling has not been well resolved in the prior art.

Method used

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  • Lithium ion battery positive-electrode composite material and lithium ion battery
  • Lithium ion battery positive-electrode composite material and lithium ion battery
  • Lithium ion battery positive-electrode composite material and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0043] [Preparation method of cathode composite material]

[0044] An embodiment of the present invention provides a method for preparing a positive electrode composite material, which includes the following steps:

[0045] S1, prepare a composite precursor, the composite precursor includes a positive electrode active material precursor and a coating layer precursor coated on the surface of the positive electrode active material precursor;

[0046] S2, reacting the composite precursor with a lithium source compound to lithiate the cladding layer precursor and positive electrode active material precursor in the composite precursor, thereby generating the positive electrode composite material.

[0047] The positive electrode active material precursor is a compound that can react with the lithium source compound to generate the positive electrode active material, specifically, it can be an oxygen-containing compound of a transition metal element. Specifically, the transition met...

Embodiment 1

[0081] Weigh 0.25g Co(OH) 2 , ultrasonically dispersed or stirred in 10mL ethanol to obtain a solid-liquid mixture. Add tetrabutyl titanate to the solid-liquid mixture, and the molar weight of the added tetrabutyl titanate is Co(OH) 2 10% of. After continuing ultrasonic oscillation or stirring, transfer the solid-liquid mixture into a dry and clean hydrothermal kettle, and take it out after heating at 150°C for 3 hours to obtain uniform amorphous TiO 2 layer formed on Co(OH) 2surface. The composite precursor and the stoichiometric ratio of LiOH?H 2 O is mixed, and the ethanol is completely evaporated to dryness, and then the temperature is raised to 800°C at a heating rate of 3°C / min, and roasted at 800°C for 5 hours, and the temperature is naturally lowered to obtain a product coated with Co ion doped Li 2 TiO 3 LiCoO 2 . see Figure 4 , the product was subjected to XRD test, showing that a pure phase of LiCoO was obtained 2 . see Figure 5 , partially enlarged th...

Embodiment 2

[0087] The conditions are exactly the same as in Example 1, the difference is only that the Co(OH) 2 Replaced by CoC 2 o 4 ?xH 2 O.

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Abstract

The invention relates to a lithium ion battery positive-electrode composite material. The lithium ion battery positive-electrode composite material comprises a positive-electrode active substance and a cladding layer cladding the surface of the positive-electrode active substance, and the material of the cladding material is a lithium-metal composite oxide having a monoclinic system structure and a space group of C2 / c The invention also relates to a lithium ion battery.

Description

technical field [0001] The invention relates to a lithium ion battery cathode composite material and the lithium ion battery. Background technique [0002] Lithium-ion battery is a new type of green chemical power source. Compared with traditional nickel-cadmium batteries and nickel-hydrogen batteries, it has the advantages of high voltage, long life, large capacity and energy density, small volume, and low self-discharge rate. Since it first entered the market in 1990, it has become more and more widely used and has been widely used in various portable electronic devices. With the rise of new energy vehicles, lithium-ion batteries are considered to be one of the ideal energy storage devices for new energy vehicles due to their excellent characteristics. [0003] Currently, the limiting factor of lithium-ion batteries is the accompanying capacity fading during cycling and the resulting poor cycle life. The reason for the capacity fading is that on the one hand, the intrins...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/485H01M4/505H01M4/525H01M10/0525
CPCH01M4/505H01M4/485H01M4/525H01M4/131H01M4/1391H01M10/052H01M4/366H01M10/0525Y02E60/122H01M4/624C01G23/005C01G25/00C01G45/1242C01G51/42C01G53/50C01P2002/52C01P2002/72C01P2002/76C01P2004/80C01P2004/84C01P2006/40Y02E60/10
Inventor 李亚栋陆君南彩云李立宏彭卿
Owner TSINGHUA UNIV
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