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Preparation method of doped modified lithium manganate positive electrode material

A technology of permanent lithium manganate and positive electrode materials, which is applied in the field of preparation of lithium ion positive electrode materials, can solve the problems of high cost, long preparation time, complicated process, etc., and achieve the effect of improving crystallization performance and electrochemical performance

Inactive Publication Date: 2015-02-04
LIUZHOU HAOXIANGTE SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The principle of the existing sol-gel method is that a variety of metal cations can form chelates with organic acids, and the chelates can be polymerized with polyhydroxy acids to form a solid polymer precursor with uniform distribution of cations. The final product can be obtained by heat treatment of the precursor; however, the preparation time of this method is long, the process is complicated, the vacuum heat treatment process is difficult to control, and the cost is high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Prepare a mixed solution with 1mol lithium acetate, 0.4mol nickel acetate, and 1.6mol manganese acetate, then add 3mol resorcinol into the mixed solution and keep stirring, add 7mol formaldehyde solution after it is completely dissolved, and then place it in a constant temperature water bath at 50°C React for 10 hours to form a gel, then place the gel in an oven at 70°C to fully dry, then raise the temperature to 300°C in an electric furnace at a rate of 8°C / min, pre-sinter at a constant temperature for 8 hours, and the pre-sintered product is ground After uniformity, raise the temperature to 550°C at a rate of 4°C / min in the electric furnace, then carry out secondary sintering at a constant temperature for 8 hours, and finally grind the product of the secondary sintering fully to obtain nickel-doped modified lithium manganate; at the same time, Dissolve the PVDF binder in NMP to make a binder solution; then add doped modified lithium manganate, binder solution, and cond...

Embodiment 2

[0040] Prepare a mixed solution with 1mol lithium acetate, 0.5mol nickel acetate, and 1.5mol manganese acetate, then add 5mol resorcinol into the mixed solution and keep stirring, add 7.5mol formaldehyde solution after it is completely dissolved, and then place it at 60°C React in a constant temperature water bath for 12 hours to form a gel, then place the gel in an oven at 80°C to fully dry, then raise the temperature to 360°C in an electric furnace at a rate of 10°C / min, pre-sinter at a constant temperature for 10 hours, and pre-sinter the product After grinding evenly, raise the temperature to 750°C at a rate of 5°C / min in an electric furnace, then carry out secondary sintering at a constant temperature for 10 hours, and finally fully grind the product of the secondary sintering to obtain nickel-doped modified lithium manganate. At the same time, the PVDF binder was dissolved in NMP to make a binder solution; then the doped modified lithium manganate, binder solution, and co...

Embodiment 3

[0042]Prepare a mixed solution with 1mol lithium acetate, 0.55mol nickel acetate, and 1.45mol manganese acetate, then add 7mol resorcinol into the mixed solution and keep stirring, add 8mol formaldehyde solution after it is completely dissolved, and then place it at a constant temperature of 70°C React in a water bath for 14 hours to form a gel, then place the gel in an oven at 90°C to fully dry, then raise the temperature to 400°C in an electric furnace at a rate of 10°C / min, pre-sinter at a constant temperature for 12 hours, and pre-sinter the product After grinding evenly, raise the temperature to 950°C at a rate of 6°C / min in an electric furnace, then carry out secondary sintering at a constant temperature for 12 hours, and finally fully grind the product of the secondary sintering to obtain nickel-doped lithium manganate. At the same time, the PVDF binder was dissolved in NMP to make a binder solution; then the doped modified lithium manganate, binder solution, and conduct...

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Abstract

The invention relates to preparation of a lithium ion positive electrode material, and specifically relates to a preparation method of a doped modified lithium manganate positive electrode material, wherein the preparation method comprises the steps: dissolving a PVDF binder in NMP to obtain a binder solution; adding doped modified lithium manganate, the binder solution and conductive acetylene black into a ball mill tank, and carrying out ball milling to obtain a slurry; carrying out single-surface scraping on an aluminum foil with the slurry; carrying out vacuum drying on the aluminum foil; and clipping and drying. With lithium acetate, manganese acetate, nickel acetate, m-dihydroxybenzene and formaldehyde as raw materials, the nickel-doped modified lithium manganate is prepared, and then the positive electrode material is prepared from the nickel-doped modified lithium manganate; with adopting of pre-sintering in the preparation process, the phase purity of the product can be improved, and material crystallization properties, discharge specific capacity and energy density are improved through secondary sintering; and through rational raw material proportion, electrochemical properties of the positive electrode material are improved.

Description

technical field [0001] The invention relates to the field of preparation of lithium ion cathode materials, in particular to a preparation method of doped modified lithium manganate cathode materials. Background technique [0002] Spinel-type lithium manganese oxide has become the first choice for the positive electrode material of power lithium-ion batteries because of its rich manganese resources, low cost, good safety, no environmental pollution, and easy preparation, but it hinders the formation of power battery-type lithium manganate industrialization capacity. The main reason is that its performance is not stable enough, that is, its capacity decays quickly during the charge-discharge cycle, especially at high temperatures. The main factors affecting its cycle performance are: 1. The purity and stability of the phase structure, and the irregular microscopic morphology; 2. The Jahn-Teller effect of the material itself; 3. The dissolution of manganese in the lithium manga...

Claims

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Application Information

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IPC IPC(8): H01M4/1397
CPCH01M4/1391H01M4/505H01M10/0525Y02E60/10
Inventor 易鉴荣林荔琍唐臻吴坚任文忠
Owner LIUZHOU HAOXIANGTE SCI & TECH
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