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Modification method for doping and synthesizing binary lithium nickel manganese oxide positive electrode material

A technology of binary lithium nickel manganese oxide and positive electrode materials, which is applied in the direction of positive electrodes, electrical components, battery electrodes, etc., can solve the problems that cannot fundamentally improve the stability of material structures, achieve the suppression of side reactions on the surface of materials, and save time , The effect of improving the capacity retention rate

Pending Publication Date: 2021-05-04
GUIZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For surface coating, it can only inhibit the corrosion of the active material by the electrolyte, but it cannot fundamentally improve the structural stability of the material.

Method used

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  • Modification method for doping and synthesizing binary lithium nickel manganese oxide positive electrode material
  • Modification method for doping and synthesizing binary lithium nickel manganese oxide positive electrode material
  • Modification method for doping and synthesizing binary lithium nickel manganese oxide positive electrode material

Examples

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Embodiment 1

[0029] Example 1. A modification method for doping and synthesizing binary lithium nickel manganese oxide cathode material, the preparation steps are as follows:

[0030] (1) Weigh 0.05mol of strontium acetate and dissolve in 200mL of deionized water with a molar ratio of 1.05:0.5:1.45 lithium acetate, nickel acetate and manganese acetate to obtain acetate solution;

[0031] (2) citric acid is dissolved in ethylene glycol at a molar ratio of 1:4, and the dissolution temperature is 80° C. to obtain a citric acid ethylene glycol solution;

[0032] (3) Add acetate solution to the citric acid ethylene glycol solution, heat and stir for about 3 hours until the solution becomes a green gel; wherein, the heating temperature is 130°C, and the stirring speed is 300r / min; an oil bath is used for heating and stirring conduct;

[0033] (4) Grind the green gel after drying at 170°C, heat it to 500°C with a heating rate of 3°C / min in a tube furnace in an air atmosphere, keep it warm for 5...

Embodiment 2

[0034] Example 2. A modification method for doping and synthesizing binary lithium nickel manganese oxide cathode material, the preparation steps are as follows:

[0035] (1) Weigh 0.10 mol of strontium acetate and dissolve in 200 mL of deionized water with a molar ratio of 1.05:0.5:1.40 lithium acetate, nickel acetate, and manganese acetate to obtain an acetate solution;

[0036] (2) citric acid is dissolved in ethylene glycol at a molar ratio of 1:4, and the dissolution temperature is 80° C. to obtain a citric acid ethylene glycol solution;

[0037] (3) Add acetate solution to the citric acid ethylene glycol solution, heat and stir for about 3 hours, until the solution becomes a green gel; wherein, the heating temperature is 130° C., and the stirring speed is 300 r / min.

[0038] (4) Grind the green gel after drying at 170°C, heat it to 500°C at a heating rate of 3°C / min in an air atmosphere, keep it for 5 hours, then raise it to 850°C at the same heating rate, and keep it f...

Embodiment 3

[0039] Example 3. A modification method for doping and synthesizing binary lithium nickel manganese oxide cathode material, the preparation steps are as follows:

[0040] (1) Weigh 0.15 mol of strontium acetate and dissolve in 200 mL of deionized water with a molar ratio of 1.05:0.5:1.35 lithium acetate, nickel acetate and manganese acetate to obtain an acetate solution;

[0041] (2) citric acid is dissolved in ethylene glycol at a molar ratio of 1:4, and the dissolution temperature is 80° C. to obtain a citric acid ethylene glycol solution;

[0042] (3) Add acetate solution to the citric acid ethylene glycol solution, heat and stir for about 3 hours, until the solution becomes a green gel; wherein, the heating temperature is 130° C., and the stirring speed is 300 r / min.

[0043] (4) Grind the green gel after drying at 170°C, heat it to 500°C at a heating rate of 3°C / min in an air atmosphere, keep it for 5 hours, then raise it to 850°C at the same heating rate, and keep it fo...

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Abstract

The invention discloses a modification method for doping and synthesizing a binary lithium nickel manganese oxide positive electrode material. The modification method comprises the following steps of: (1) dissolving lithium acetate, nickel acetate, manganese acetate and strontium acetate in deionized water to obtain an acetate solution; (2) dissolving citric acid in ethylene glycol to obtain a citric acid-ethylene glycol solution; (3) adding the acetate solution into the citric acid-ethylene glycol solution, heating and stirring the mixed solution until the solution becomes green gel; and (4) drying the green gel, grinding the product, and sintering the ground product in an air atmosphere to obtain the binary lithium nickel manganese oxide positive electrode material. The modification method is a synthesis process which is relatively low in cost, simple to operate and high in benefit, and has the advantages that Sr<2+> doping is realized, the structural stability is enhanced, side reactions on the surface of the material are inhibited, and the cycle performance of the material is greatly improved.

Description

technical field [0001] The invention relates to the technical field of silicon-carbon negative electrode materials for lithium ion batteries, in particular to a modification method for doping and synthesizing binary nickel manganese oxide lithium positive electrode materials. Background technique [0002] As a green and environmentally friendly energy storage device, lithium-ion batteries are widely used in electric vehicles, hybrid vehicles, and new energy sources. As a key component of lithium-ion batteries, cathode materials play an important role in the energy density and cost of lithium-ion batteries. Among different cathode materials, the binary lithium nickel manganese oxide cathode material is considered to be one of the most promising cathode materials for the next generation due to its low price, environmental friendliness, and high voltage range. However, some problems exist in the binary lithium nickel manganese oxide cathode material, for example, the voltage i...

Claims

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Application Information

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IPC IPC(8): H01M4/525H01M4/505H01M10/0525
CPCH01M4/525H01M4/505H01M10/0525H01M2004/028Y02E60/10
Inventor 吴复忠吉祥戴新义
Owner GUIZHOU UNIV
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