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Lithium-rich positive electrode modified material of lithium ion battery and preparation method of lithium-rich positive electrode modified material

A technology for lithium-ion batteries and positive electrode materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of low initial energy utilization, large irreversible capacity loss, and poor rate performance, and achieve the purpose of suppressing interface side reactions and improving Effect of rate performance, cycle performance, and stability maintenance

Inactive Publication Date: 2017-04-26
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this type of material has the problems of low initial energy utilization rate, large irreversible capacity loss, and poor rate performance at high current density.

Method used

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  • Lithium-rich positive electrode modified material of lithium ion battery and preparation method of lithium-rich positive electrode modified material
  • Lithium-rich positive electrode modified material of lithium ion battery and preparation method of lithium-rich positive electrode modified material
  • Lithium-rich positive electrode modified material of lithium ion battery and preparation method of lithium-rich positive electrode modified material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Example 1 A lithium-rich cathode material for a lithium ion battery is Li[Li 0.2 Ni 0.15 Mn 0.55 Co 0.1 ]O 2 , including the following steps:

[0026] (1) Mixing: Weigh analytically pure CH according to the stoichiometric ratio (1.26:0.15:0.55:0.1). 3 COOLi·2H 2 O, Ni (CH 3 COO) 2 ·4H 2 O, Mn (CH 3 COO) 4H 2 O, Co(CH 3 COO) 2 ·4H 2 O, dissolve in deionized water respectively, gradually add citric acid solution dropwise, the addition of citric acid solution is equal to the sum of the molar amounts of transition metal ions, and adjust the pH value of the mixed solution to about 7 with concentrated ammonia water;

[0027] (2) Heating: the mixed solution system obtained in step (1) is heated and stirred in a water bath at 80° C. to evaporate water to gradually obtain a gel;

[0028] (3) Drying: drying the gel obtained in step (2) in a blast drying oven at 120°C for 24 hours to obtain a dry gel;

[0029] (4) Preparation of precursor: pre-sintering the dried ge...

Embodiment 2

[0031] Example 2 A surface coated with 3wt% TiO 2 Lithium-rich cathode materials for lithium-ion batteries Li[Li 0.2 Ni 0.15 mn 0.55 co 0.1 ]O 2 , including the following steps:

[0032] With the Li[Li prepared by embodiment 1 0.2 Ni 0.15 mn 0.55 co 0.1 ]O 2 The positive electrode material and mass fraction ratio are 3wt%TiO 2 Disperse into ethanol solution with 10 times the mass, heat and stir at 40°C until the solvent is basically volatilized, dry at 80°C for 24 hours, and finally calcinate at 450°C for 6 hours to obtain the final product surface coated with 3wt% TiO 2 Li[Li 0.2 Ni 0.15 mn 0.55 co 0.1 ]O 2 .

Embodiment 3

[0033] Example 3 A surface coated with 3wt% MnO 2 Lithium-rich cathode materials for lithium-ion batteries Li[Li 0.2 Ni 0.15 mn 0.55 co 0.1 ]O 2 , including the following steps:

[0034] The prepared Li[Li 0.2 Ni 0.15 mn 0.55 co 0.1 ]O 2 The positive electrode material and mass fraction ratio are 3wt% MnO 2 Disperse into an ethanol solution with 6 times the mass, heat and stir at 40°C until the solvent is basically volatilized, dry at 80°C for 24 hours, and finally calcinate at 450°C for 6 hours to obtain the final product surface coated with 3wt% MnO 2 Li[Li 0.2 Ni 0.15 mn 0.55 co 0.1 ]O 2 .

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Abstract

The invention relates to a lithium-rich positive electrode modified material of a lithium ion battery and a preparation method of the lithium-rich positive electrode modified material, and belongs to the technical field of a positive electrode material of the lithium ion battery. The lithium-rich positive electrode modified material comprises a positive electrode material and a three-class metal oxide cladding material, wherein the cladding material is TiO2, MnO2 or Al2O3. The preparation method comprises the steps of performing water bath stirring and heating to obtain gel by a sol-gel method, performing drying to obtain dried gel, respectively performing low-temperature pre-sintering and high-temperature calcination, obtaining the positive electrode material after cooling and grinding, dispersing the prepared positive electrode material and TiO2 and MnO2 cladding materials in deionized water, performing constant-temperature stirring, and performing standing, filtering, washing, drying and calcination to obtain the lithium-rich positive electrode modified material of the lithium ion battery. While for Al2O3, a liquid phase cladding method is adopted, the positive electrode material is dispersed in an aluminum nitrate nonahydrate solution, and the required modified material is obtained after constant-temperature stirring, standing, filtering, washing, drying and calcination. The preparation method is simple and easy to operate, the lithium-rich positive electrode modified material obtained through preparation is uniform in particle grain distribution and high in crystallinity, and the rate performance and the cycle performance of the material after cladding both are obviously improved.

Description

technical field [0001] The invention relates to a lithium-ion battery-rich positive electrode modified material and a preparation method thereof, and belongs to the technical field of lithium-ion battery positive electrode materials. Background technique [0002] Lithium-ion batteries, as green secondary batteries, are widely used in various digital electronic products and communication equipment due to their high specific capacity, high power density, and long cycle life. With the continuous popularization and expansion of its applications, lithium-ion batteries have gradually emerged in the large-capacity battery market such as electric vehicles, and have attracted much attention. As far as the development process of lithium-ion batteries is concerned, compared with the rapidly developing anode materials and electrolytes of lithium-ion batteries, the development of cathode materials is relatively slow; and in terms of its large-scale promotion, cathode materials are both c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 张海朗唐婷
Owner JIANGNAN UNIV
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