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Preparation method of layered lithium-rich positive electrode material

A lithium-rich positive electrode material and solvothermal technology, applied in battery electrodes, electrical components, electrochemical generators, etc., can solve the problems of high irritation of ammonia water, difficulty in precise control of stable pH value, and large product fluctuations. Achieve the effects of simple process, easy control of shape and size, and excellent electrochemical performance

Inactive Publication Date: 2016-11-30
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the preparation process of the co-precipitation method, it is difficult to accurately control the stable pH value, and the ammonia water used to adjust the pH value is highly irritating and will cause water pollution after discharge.
When carrying out lithium complexing, the solid-phase method is generally used, and it is difficult to achieve uniform mixing at the atomic level, so that the product fluctuates greatly, which seriously affects the performance of the final product.

Method used

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  • Preparation method of layered lithium-rich positive electrode material
  • Preparation method of layered lithium-rich positive electrode material
  • Preparation method of layered lithium-rich positive electrode material

Examples

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Comparison scheme
Effect test

Embodiment 1

[0032] Weigh 1.6230g of lithium acetate dihydrate, 0.4232g of nickel acetate tetrahydrate, 1.6500g of manganese acetate tetrahydrate, and 0.4172g of cobalt acetate tetrahydrate and dissolve them in 40mL of ethanol, stir until completely dissolved, and dissolve 40mL of oxalic acid 4.4124g The ethanol solution was poured slowly for co-precipitation. The resulting suspension was transferred to a reaction kettle, and solvothermally reacted at 180°C for 24 hours. After natural cooling, the product was washed and filtered with alcohol, and the precipitate was dried at 100°C for 10 hours. The obtained sample was pre-calcined in air at 450°C for 5 hour, and then the sample was calcined at 900°C for 12 hours, and the obtained powder was the layered lithium-rich cathode material.

[0033] Battery assembly: Weigh 0.4g of the obtained layered lithium-rich cathode material, add 0.05g of conductive carbon black (Super-P) as a conductive agent and 0.05g of PVDF (HSV900) as a binder, and add ...

Embodiment 2

[0035]Weigh 1.6230g of lithium acetate dihydrate, 0.4232g of nickel acetate tetrahydrate, 1.6500g of manganese acetate tetrahydrate, and 0.4172g of cobalt acetate tetrahydrate and dissolve them in 40mL of ethanol, stir until completely dissolved, and dissolve 40mL of oxalic acid 6.6186g The ethanol solution was poured slowly for co-precipitation. The obtained suspension was transferred to a reaction kettle, and solvothermally reacted at 180°C for 24 hours. After natural cooling, the product was washed and filtered with alcohol, and the precipitate was dried at 100°C for 10 hours. The obtained sample was pre-calcined in air at 450°C for 5 hour, and then the sample was calcined at 900°C for 12 hours, and the obtained powder was the layered lithium-rich cathode material. The sample was prepared and assembled into a CR2025 button battery, and the specific capacity of the first discharge at 0.1C was 265mAh / g.

Embodiment 3

[0037] Weigh 1.7004g of lithium acetate dihydrate, 0.4232g of nickel acetate tetrahydrate, 1.6500g of manganese acetate tetrahydrate, and 0.4172g of cobalt acetate tetrahydrate and dissolve them in 40mL of ethanol, stir until completely dissolved, and dissolve 40mL of oxalic acid 5.5155g The ethanol solution was poured slowly for co-precipitation. The obtained suspension was transferred to a reaction kettle, and solvothermally reacted at 180°C for 24 hours. After natural cooling, the product was washed and filtered with alcohol, and the precipitate was dried at 100°C for 10 hours. The obtained sample was pre-calcined in air at 450°C for 5 hour, and then the sample was calcined at 900°C for 12 hours, and the obtained powder was the layered lithium-rich cathode material. The sample was prepared and assembled into a CR2025 button battery, and the specific capacity of the first discharge at 0.1C was 231.6mAh / g.

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Abstract

The invention discloses a method for synthesizing high-specific capacity lithium-rich positive electrode material through a coprecipitation-solvothermal method. The method comprises the steps of dissolving a transition metal compound, a lithium compound and a metal-doped compound into a proper solvent according to a stoichiometric ratio to prepare a metal ion solution with certain concentration; dissolving a precipitant into the solvent to prepare a precipitant solution with certain concentration; mixing the metal ion solution with the precipitant solution to obtain a coprecipitation solution; transferring the coprecipitation solution into a reaction kettle for solvothermal reaction and then carrying out filtering, washing and drying; and finally carrying out high-temperature sintering on the sample to obtain xLi<2>MnO<3>.(1-x)LiNi<1-a-b-z>CoMnMzO<2> lithium-rich positive electrode material. The method is simple in process; the preparation cost is relatively low, the shape and form and the size of the obtained lithium-rich positive electrode material are relatively easy to control, the electrochemical properties are excellent, the initial charge-discharge specific capacity is greater than 270mAh / g and the lithium-rich positive electrode material is suitable for a power battery and an energy storage battery.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a method for preparing a layered lithium-rich cathode material. Background technique [0002] The current power energy storage battery has higher and higher requirements for high energy density, and the lithium-rich layered positive electrode material xLi 2 MnO 3 •(1-x)LiNi 1-a-b-z co a mn b m z o 2 , due to the advantages of higher specific capacity, high operating voltage window and abundant raw materials, it has become a cathode material that has been widely concerned in recent years. [0003] The synthesis methods of lithium-rich layered cathode materials mainly include solid-phase method, traditional co-precipitation method and sol-gel method. Among them, the temperature required by the solid-state method is high, the uniformity of the product is difficult to guarantee, and the shape is not easy to control, so it is difficult to obtain a lithium-rich layered...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M10/0525
CPCH01M4/364H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 陈召勇严小艳朱华丽
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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