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Lithium ion battery layered positive electrode material doped with metal ions, and preparation method thereof

A lithium-ion battery and metal ion technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as voltage attenuation and poor rate performance of lithium-rich cathode materials, and achieve shortened synthesis cycle, optimized performance, and short synthesis cycle Effect

Inactive Publication Date: 2017-08-04
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to provide a layered positive electrode material doped with metal ions and its preparation method. The material can solve the voltage attenuation of lithium-rich positive electrode materials by adding antimony and bismuth elements and a suitable doping ratio. And the problem of poor rate performance

Method used

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  • Lithium ion battery layered positive electrode material doped with metal ions, and preparation method thereof
  • Lithium ion battery layered positive electrode material doped with metal ions, and preparation method thereof
  • Lithium ion battery layered positive electrode material doped with metal ions, and preparation method thereof

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Embodiment 1

[0032] In this embodiment, Sb element is doped into Li 1.2 mn 0.54 co 0.13 Ni 0.13 o 2 Layered lithium-rich cathode materials. The specific implementation is as follows: Weigh 4.8691g of lithium acetate dihydrate, 1.2688g of nickel acetate tetrahydrate, 4.8765g of manganese acetate tetrahydrate, 1.2512g of cobalt acetate tetrahydrate, and 0.0924g of antimony acetate tetrahydrate, dissolve them in 40mL of ethanol, and stir until completely To dissolve, slowly pour 16.6298 g of oxalic acid into 40 mL of ethanol solution at room temperature of 25 ° C into the metal salt solution for co-precipitation, and continue stirring for 30 min. Transfer the above co-precipitation suspension to a reaction kettle, react with solvothermal reaction at 180°C for 24 hours, wash and filter the product with alcohol after natural cooling, dry the precipitate and place it in a muffle furnace, and pre-heat it at 450°C in an air atmosphere. Calcined for 5 hours, and then calcined at 900° C. for 12...

Embodiment 2

[0035] In this embodiment, Sb element is doped into Li 1.2 mn 0.54 co 0.13 Ni 0.13 o 2 Layered lithium-rich cathode materials. The specific implementation is: take by weighing 4.8691g of lithium acetate dihydrate, 1.2688g of nickel sulfate tetrahydrate, 4.7280g of manganese sulfate tetrahydrate, 1.6934g of cobalt sulfate tetrahydrate, and 0.2273g of antimony acetate tetrahydrate and dissolve them in 40mL of ethylene glycol, stirring until completely dissolved. At room temperature of 25°C, 40 mL of ethylene glycol solution dissolved with 15.3247 g of ammonium bicarbonate was slowly poured into the metal salt solution for co-precipitation, and the stirring was continued for 30 min. Transfer the above co-precipitation suspension to a reaction kettle, react with solvothermal reaction at 180°C for 24 hours, wash and filter the product with alcohol after natural cooling, dry the precipitate and place it in a muffle furnace, and pre-heat it at 450°C in an air atmosphere. Calcin...

Embodiment 3

[0037] In this embodiment, Sb element is doped into Li 1.2 mn 0.54 co 0.13 Ni 0.13 o 2 Layered lithium-rich cathode materials. The specific implementation is as follows: Weigh 4.8691g of lithium carbonate dihydrate, 1.2688g of nickel acetate tetrahydrate, 4.5795g of manganese acetate tetrahydrate, 1.2512g of cobalt acetate tetrahydrate, and 0.4622g of antimony acetate tetrahydrate are dissolved in 40mL of ethanol and stirred until completely To dissolve, slowly pour 40 mL of ethanol solution dissolved with 16.6298 g of oxalic acid into it for co-precipitation, and keep stirring for 30 min. Transfer the above co-precipitation suspension to a reaction kettle, and react with solvothermal reaction at 180°C for 24 hours. After natural cooling, the product is washed and filtered with alcohol, and the precipitate is dried and placed in a muffle furnace. Calcined for 5 hours, and then calcined at 880° C. for 12 hours, the obtained powder is the layered lithium-rich cathode materi...

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Abstract

The invention discloses a lithium ion battery layered positive electrode material doped with metal ions, and a preparation method thereof. The molecular general formula of the layered positive electrode material is Li1+aM1-a-xMexO2, wherein M is any one or more of Mn, Ni, Co, Al, Cr, Mg, Ca, Zr, Ti, Zn, and Fe, Me is any one or both of Sb and Bi, a is not less than 0 and not more than 1 / 3, and x is more than 0 and not more than 2 / 3. The preparation method comprises the following steps: respectively processing metal salt (M + Me + Li) and a precipitating agent to prepare organic solvent solutions with certain concentrations; and mixing the solutions, transferring the obtained mixed solution to a reaction kettle, carrying out a solvothermal reaction, filtering the obtained reaction product, drying the filtered reaction product, and sintering the dried reaction product to obtain the filtration, drying and sintering to obtain the lithium ion battery layered positive electrode material doped with metal ions. The lithium ion battery layered positive electrode material doped with the metal ions Sb and Bi can inhibit the voltage attenuation and increase the rate capacity, and is suitable for lithium ion batteries.

Description

technical field [0001] The invention relates to the technical field of chemical power lithium batteries, in particular to a layered cathode material for lithium ion batteries doped with metal ions. Background technique [0002] Lithium-ion batteries have become one of the most widely used secondary batteries due to their advantages such as high energy density, good cycle performance, high operating voltage, and no memory effect. With the rapid development of electronic technology, people put forward higher energy density and longer cycle performance requirements for lithium-ion batteries. Therefore, the development of high-performance cathode materials is particularly important for the development of lithium-ion batteries. [0003] Ternary layered cathode material LiMO 2 (M=Co, Mn, Ni) has become the research focus of high-capacity cathode materials in recent years due to its better electrochemical performance compared with olivine-type lithium iron phosphate and spinel-ty...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/525H01M4/48H01M10/0525
CPCH01M4/366H01M4/48H01M4/525H01M10/0525Y02E60/10
Inventor 陈召勇严小艳
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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