Method and device for preventing oxidation in synthesis of anode material of lithium-ion battery

A technology for lithium-ion batteries and cathode materials, which is applied in the field of anti-oxidation of cathode materials for synthesizing lithium-ion batteries, can solve the problems of large amount of protective gas, unstable product performance, and unfavorable large-scale production, so as to reduce the purity of equipment and protective atmosphere. requirements, the requirements for reducing air tightness, and the effect of reasonable structure

Active Publication Date: 2011-02-02
CENT SOUTH UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the harsh reaction conditions, the amount of protective gas used is large, the cost is high, and the product performance is easily affected by the atmosphere and unstable, which is not conducive to large-scale production

Method used

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  • Method and device for preventing oxidation in synthesis of anode material of lithium-ion battery
  • Method and device for preventing oxidation in synthesis of anode material of lithium-ion battery
  • Method and device for preventing oxidation in synthesis of anode material of lithium-ion battery

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Embodiment 1

[0042] The schematic diagram of the reaction vessel is shown in figure 1 , figure 2 shown. The reactant ammonium dihydrogen phosphate, ferrous oxalate, lithium carbonate, and conductive agent required for the synthesis of lithium iron phosphate, the positive electrode material of the lithium ion battery, are filled in the loading area of ​​the reaction vessel. Place a partition on the upper surface of the loading area. Graphite, a reductant used to prevent oxidation of reactants and products in the loading zone, is placed in the isolation zone. Place a cover plate on the upper surface of the isolation area. Inside the reaction vessel, an upright fixing rod is welded at the bottom to fix the cover and partition. The filled reaction container is put into an electric furnace for high-temperature sintering reaction, and the atmosphere in the reaction zone inside the electric furnace is a mixed gas of oxygen and nitrogen with an oxygen content of 0.5%, 4%, or 20%. Raise the t...

Embodiment 2

[0045] The schematic diagram of the reaction vessel is shown in image 3 , Figure 4 shown. The reactant ammonium dihydrogen phosphate, manganese carbonate, lithium carbonate and conductive agent required for synthesizing lithium manganese phosphate lithium ion battery cathode material are filled in the loading area of ​​the reaction vessel. Place a partition on the upper surface of the loading area. A mixture of reducing agent acetylene black, activated carbon and phenolic resin is placed in the isolation area to prevent the reactants and products in the loading area from being oxidized. Place a cover plate on the upper surface of the isolation area. Inside the reaction vessel, an upright fixing rod is welded at the bottom to fix the cover and partition. The filled reaction container is put into an electric furnace for high-temperature sintering reaction, and the atmosphere in the reaction zone inside the electric furnace is a mixed gas of oxygen and argon with an oxygen ...

Embodiment 3

[0048] The schematic diagram of the reaction vessel is shown in Figure 5 , Figure 6 shown. The reactant lithium carbonate, ammonium dihydrogen phosphate, vanadium phosphate and conductive agent required for the synthesis of lithium vanadium phosphate, the positive electrode material of the lithium ion battery, are filled in the loading area of ​​the reaction vessel. Place a partition on the upper surface of the loading area. A reducing agent metal aluminum for preventing oxidation of reactants and products in the loading area is placed in the isolation area. Place a cover plate on the upper surface of the isolation area. Inside the reaction vessel, an upright fixing rod is welded at the bottom to fix the cover and partition. Put the filled reaction container into the electric furnace for high-temperature sintering reaction, and the atmosphere in the reaction zone inside the electric furnace is air. Raise the temperature of the electric furnace to 650° C., keep the tempe...

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Abstract

The invention discloses a method and a device for preventing oxidation in synthesis of an anode material of a lithium-ion battery. The method comprises the following steps of: filling raw materials needed for synthesizing the anode material of the lithium-ion battery in a bottom part of a reactor, wherein the region is called a material loading region; filling a reducing agent or an inert material which does not participate in chemical reactions at a high temperature in a region above the material loading region, wherein the region is called an isolation region; placing the filled reactor into an electric furnace for sintering at a high temperature; and maintaining an oxygen content of 0.5 to 30 percent of the air in the reaction region in the electric furnace; and thus obtaining the needed anode material of a lithium-ion battery. The process is technical method, convenient in operation and reasonable in structure, can effectively reduce the production cost for synthesizing the anode material of the lithium-ion battery, greatly decreases requirements on the equipment and the purity of protective atmosphere, and can realize massive production and replace the prior synthesizing process of the anode material of the lithium-ion battery.

Description

technical field [0001] The invention relates to the technical field of synthesis of positive electrode materials of lithium ion batteries, in particular to an anti-oxidation method and device for synthesizing positive electrode materials of lithium ion batteries. Background technique [0002] Some lithium-ion battery cathode materials, such as lithium iron phosphate (LiFePO 4 ), lithium manganese phosphate (LiMnPO 4 ), lithium vanadium phosphate (Li 3 V 2 (PO 4 ) 3 ), lithium vanadium fluorophosphate (LiVPO 4 F), lithium iron silicate (Li 2 FeSiO 4 ), lithium manganese silicate (Li 2 MnSiO 4 ) is easily oxidized by oxygen at higher temperatures, and the synthesis of such materials requires the protection of reducing or inert gases. [0003] The traditional synthesis method of these materials is: filling the raw materials required for the synthesis of materials in the reaction vessel, and then putting them into a fully enclosed atmosphere furnace completely isolated...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/04B01J19/00H01M4/58H01M4/48C01B25/45C01B33/20C01D15/00
CPCY02E60/12Y02E60/10
Inventor 王志兴彭文杰李新海石小东郭华军李旭袁荣忠
Owner CENT SOUTH UNIV
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