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Method for preparing high-performance lithium-enriched positive electrode material through solvothermal method

A technology of lithium-rich positive electrode materials and solvothermal method, applied in battery electrodes, electrical components, circuits, etc., can solve problems such as potential safety hazards and cost increases, and achieve the effects of high applicability in production, uniform particles, and simple operation steps

Inactive Publication Date: 2018-08-07
德沃科技(天津)有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Not only the co-precipitation method, but other methods have certain requirements for equipment. Another example is the polymer pyrolysis method, which needs to be prepared in an inert atmosphere, and the reaction releases a lot of heat, which will cause safety hazards. When a large amount of production is put into production, the cost will be greatly increased. promote

Method used

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  • Method for preparing high-performance lithium-enriched positive electrode material through solvothermal method
  • Method for preparing high-performance lithium-enriched positive electrode material through solvothermal method
  • Method for preparing high-performance lithium-enriched positive electrode material through solvothermal method

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Effect test

Embodiment 1

[0019] A method for preparing a high-performance lithium-rich cathode material by a solvothermal method, comprising the steps of:

[0020] (1) Using 50ml of absolute ethanol as a solvent, dissolve 3g of lithium acetate dihydrate, 1g of nickel acetate tetrahydrate, 1g of cobalt acetate tetrahydrate and 4g of manganese acetate tetrahydrate, add 3g of oxalic acid dihydrate, ultrasonically and stir until completely dissolved, Transfer to a reaction kettle and heat at 180°C for 28h;

[0021] (2) washing the product obtained in the reaction kettle in step (1) with absolute ethanol, and suction filtering, placing the obtained solid product in an oven at 80° C. and completely drying the absolute ethanol to obtain a dry solid;

[0022] (3) Calcining the solid obtained in step (2) at 400° C. for 7 hours, and then at 800° C. for 14 hours to obtain a high-performance lithium-rich cathode material.

[0023] After the first experiment, the first discharge specific capacity of the lithium-r...

Embodiment 2

[0025] A method for preparing a high-performance lithium-rich cathode material by a solvothermal method, comprising the steps of:

[0026] (1) Using 50ml of absolute ethanol as a solvent, dissolve 8g of lithium acetate dihydrate, 2g of nickel acetate tetrahydrate, 2g of cobalt acetate tetrahydrate and 8g of manganese acetate tetrahydrate, add 7g of oxalic acid dihydrate, ultrasonically, stir until completely dissolved, Transfer to the reactor and heat at 220°C for 18h;

[0027] (2) washing the product obtained in the reaction kettle in step (1) with absolute ethanol, and suction filtering, placing the obtained solid product in an oven at 100° C. to completely dry the absolute ethanol to obtain a dry solid;

[0028] (3) The solid obtained in the step (2) is heated to 500° C. for 5 hours, and then heated to 1000° C. for 10 hours to obtain a high-performance lithium-rich cathode material.

[0029] After the first experiment, the first discharge specific capacity of the lithium-r...

Embodiment 3

[0031] A method for preparing a high-performance lithium-rich cathode material by a solvothermal method, comprising the steps of:

[0032] (1) Using 50ml of absolute ethanol as a solvent, dissolve 5g of lithium acetate dihydrate, 1.5g of nickel acetate tetrahydrate, 1.5g of cobalt acetate tetrahydrate and 6g of manganese acetate tetrahydrate, add 5g of oxalic acid dihydrate, and stir until completely Dissolved, transferred to the reactor, heated at 200 ° C for 24h.

[0033] (2) washing the product obtained in the reaction kettle in step (1) with absolute ethanol, and suction filtering, placing the obtained solid product in an oven at 90° C. and completely drying the absolute ethanol to obtain a dry solid;

[0034] (3) Calcining the solid product obtained in step (2) at 450° C. for 6 hours, and then at 900° C. for 12 hours to obtain a high-performance lithium-rich cathode material.

[0035] After the first experiment, the first discharge specific capacity of the lithium-rich c...

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Abstract

The invention discloses a method for preparing a high-performance lithium-enriched positive electrode material through a solvothermal method. The method comprises the following steps: (1) dissolving lithium acetate dihydrate, nickel acetate tetrahydrate, cobalt acetate tetrahydrate and manganese acetate tetrahydrate by taking absolute ethyl alcohol as a solvent; adding oxalic acid dihydrate, carrying out ultrasonic treatment and stirring until the oxalic acid dihydrate is completely dissolved; transferring a mixture into a reaction kettle and heating at 180 to 220 DEG C for 18 to 28h; (2) washing a product obtained by step (1) with the absolute ethyl alcohol and filtering and drying; (3) raising the temperature of a solid obtained by step (2) to 400 to 500 DEG C and calcining for 5 to 7h;then raising the temperature to 800 to 1000 DEG C and calcining for 10 to 14h to obtain the high-performance lithium-enriched positive electrode material. According to the method disclosed by the invention, no pollutants are generated in a whole process and the operation is simple; the obtained product has a high discharge specific capacity, good electrochemical performance, small material granularity and uniform grains.

Description

technical field [0001] The invention relates to a method for preparing a high-performance lithium-rich cathode material by a solvothermal method. Background technique [0002] Nowadays, the demand for energy storage continues to increase, and the development of high-energy-density lithium-ion batteries has played a key role. It has high energy storage capacity, good cycle stability and environmental protection, and is one of the most important energy storage devices for electric vehicles and hybrid vehicles. However, the current lithium-ion cathode materials cannot meet the requirements of high energy density. Therefore, it has become a very important issue to find cathode materials that are easy to prepare and can meet the requirements of high energy density. Among many cathode materials for lithium-ion batteries, layered lithium manganese-based oxides, lithium-rich cathode materials xLi 2 MnO 3 ·(1-x)LiMn 1 / 3 Ni 1 / 3 co 1 / 3 o 2 (x=0.5) is an attractive positive elect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36
CPCH01M4/36Y02E60/10
Inventor 王兴尧李文汭
Owner 德沃科技(天津)有限责任公司
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