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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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[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 substra

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

Examples

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[0025] Example 1

[0026] First, dissolve the stoichiometric ratio of manganese nitrate and lithium nitrate (ie, the molar ratio of manganese nitrate: lithium nitrate is 2:1) in ethanol, add polystyrene particles with a particle size of 100 nm to them, stir and remove the solvent to obtain a powder Slowly increase the temperature to 700°C and calcinate for 3 hours. After cooling to room temperature, remove and grind, sieving to obtain porous LiMn 2 O 4 . See the attached X-ray diagram Figure 4 (b) Relative to the X-ray image of Comparative Example 1, the X-ray image of Example 1 shows that LiMn 2 O 4 Good spinel structure with a small amount of Mn 2 O 3 Impure, SEM and TEM are shown in the attached figure 1 with 2 , Indicating a porous structure.

Example Embodiment

[0027] Example 2

[0028] First, dissolve the stoichiometric ratio of manganese nitrate and lithium nitrate (ie, the molar ratio of manganese nitrate to lithium nitrate is 2:1) in a mixture of ethanol and water, add polystyrene particles with a particle size of 10 nm to the mixture, stir to remove After solvent, the obtained powder is slowly heated to 500°C and calcined for 3 hours. After cooling to room temperature, it is taken out and ground, sieved to obtain porous LiMn 2 O 4 . See the X-ray chart Figure 4 (a) Relative to the X-ray diagram of Comparative Example 1, the X-ray diagram of Example 2 also shows the hole-like LiMn 2 O 4 Good spinel structure, but its strength is weaker than that of Example 1, and contains a small amount of Mn 2 O 3 Impure.

Example Embodiment

[0029] Example 3

[0030] First, dissolve the stoichiometric ratio of 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 then remove the solvent , After grinding, calcining at 500℃ for 3 hours, after cooling to room temperature, remove and grind, sieving, you can get LiMn 2 O 4 . The scanning electron microscope image shows the same 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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