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Lithium ion battery porous LiMn2O4 cathode material and the preparation method thereof

A technology of lithium ion battery and positive electrode material, applied in the field of lithium ion battery LiMn2O4 positive electrode material and its preparation, can solve the problems of high cost and difficulty in mass production, and achieve the effects of high specific capacity, stable cycle performance and good rate performance.

Inactive Publication Date: 2009-10-28
FUDAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this publication, expensive gold is used as the conductive substrate, which is expensive and difficult to use in mass production
[0005] After in-depth research, the inventors have found that the porous LiMn can be synthesized by directly using the polymer as a template under substrate-free conditions. 2 o 4 , which overcomes the currently known preparation of macroporous ordered LiMn 2 o 4 Disadvantages of high cost of the method

Method used

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  • Lithium ion battery porous LiMn2O4 cathode material and the preparation method thereof
  • Lithium ion battery porous LiMn2O4 cathode material and the preparation method thereof
  • Lithium ion battery porous LiMn2O4 cathode material and the preparation method thereof

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Embodiment 1

[0026] First, manganese nitrate and lithium nitrate in stoichiometric ratio (i.e. manganese nitrate: lithium nitrate molar ratio is 2:1) are dissolved in ethanol, and polystyrene particles with a particle diameter of 100nm are added thereto, stirred, and after solvent removal, the obtained powder Slowly heat up to 700°C and calcined for 3 hours, cool to room temperature, remove and grind, and sieve to obtain porous LiMn 2 o 4 . Its X-ray diagram is attached Figure 4 (b), relative to the X-ray pattern of Comparative Example 1, the X-ray pattern of Example 1 shows the porous LiMn 2 o 4 Good spinel structure with a small amount of Mn 2 o 3 Impure, SEM, TEM are shown in the attached figure 1 with 2 , indicating a porous structure.

Embodiment 2

[0028] First, dissolve manganese nitrate and lithium nitrate in stoichiometric ratio (i.e. manganese nitrate: lithium nitrate molar ratio is 2:1) in the mixture of ethanol and water, add polystyrene particles with a particle diameter of 10nm therein, stir, remove After the solvent is removed, the obtained powder is slowly heated to 500°C for calcination for 3 hours, cooled to room temperature, removed for grinding, and sieved to obtain porous LiMn 2 o 4 . Its X-ray image is shown in Figure 4 (a), with respect to the X-ray pattern of comparative example 1, the X-ray pattern of embodiment 2 has shown hole shape LiMn equally 2 o 4 Good spinel structure, but its strength is weakened relative to Example 1, and contains a small amount of Mn 2 o 3 impurity.

Embodiment 3

[0030] First, dissolve the stoichiometric manganese acetate and lithium acetate in water, and make the concentration of the two acetates reach 0.3M, then add polymethyl methacrylate with a particle size of 500nm to the solution, stir, and finally remove the solvent , after grinding, calcined at 500°C for 3 hours, cooled to room temperature, removed the grinding, and sieved to obtain LiMn 2 o 4 . Its scanning electron micrograph shows that it is also a hole-like structure.

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Abstract

The invention belongs to the technical field of lithium ion batteries, in particular relates to a lithium ion battery porous LiMn2O4 cathode material and the preparation method thereof. The preparation of the material adopts polymer as the template agent; the utilized polymer is olefin polymer such as polystyrene, polypropylene, polyethylene, polyacrylonitrile, polymethyl methacrylate and the like; the range of the particle size is between 10nm and 800nm, preferably between 100nm and 200nm. The LiMn2O4 material prepared by utilizing the method has porous structure, high specific capacity, good rate capability, and stable cycle performance, and is applicable to a liquid state lithium ion battery, a polymer lithium ion battery, a water solution rechargeable lithium battery and a composite super capacitor.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, in particular to a lithium ion battery LiMn 2 o 4 Cathode material and preparation method thereof. The prepared material has a porous structure with a pore size of 10nm-800nm, high specific capacity, good rate performance, and stable cycle performance. It is suitable for liquid lithium-ion batteries, polymer lithium-ion batteries, aqueous solution rechargeable lithium batteries and composite supercapacitors. Background technique [0002] Since the 1990s, lithium-ion batteries have developed rapidly. Due to its high working voltage, high capacity, high specific energy and good cycle performance, the application fields are more and more extensive. With the emergence of the energy crisis, lithium-ion power batteries have also become a type of power source with competitiveness and development prospects. In the entire lithium-ion battery system, the performance of the cathode materia...

Claims

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Application Information

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IPC IPC(8): H01M4/04H01M4/48H01M4/50C01G45/02H01M10/36H01M4/02
CPCY02E60/12Y02E60/10
Inventor 占孝云曲群婷郭文亮吴宇平
Owner FUDAN UNIV
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