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Oxygen vacancy-containing layered lithium-rich cathode material and preparation method thereof

A lithium-rich cathode material and layered technology, applied in the field of layered lithium-rich cathode materials, can solve problems such as insignificant effects, and achieve the effects of simple preparation process, excellent cycle performance and stable chemical structure

Inactive Publication Date: 2019-06-25
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The Chinese patent application publication number CN105185980A discloses a TiO 2 The preparation method of the coated layered lithium-rich ternary positive electrode material, which uses TiO 2 As a cladding layer, it prevents capacity decay to a certain extent, but the effect is not obvious

Method used

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  • Oxygen vacancy-containing layered lithium-rich cathode material and preparation method thereof
  • Oxygen vacancy-containing layered lithium-rich cathode material and preparation method thereof
  • Oxygen vacancy-containing layered lithium-rich cathode material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0036] A layered lithium-rich cathode material containing oxygen vacancies, the lithium-rich manganese-based cathode material contains Li, Mn, Ni, Co and O elements.

[0037] The preparation method of the above-mentioned lithium-rich manganese-based positive electrode material specifically includes the following steps:

[0038] 1) Dissolve 0.8112g of oxalic acid dihydrate in 60mL of a mixed solvent of ethanol and water (the volume ratio of ethanol and water is 1:0.2), stir and dissolve in a constant temperature water bath at 60°C to obtain solution A;

[0039] 2) Dissolve soluble 0.4820g lithium acetate, 0.4902g manganese acetate, 0.1244g nickel acetate and 0.1245g cobalt acetate in 60ml of mixed solvent of ethanol and water (the volume ratio of ethanol and water is 1:0.2), and keep the temperature at 60°C Stir in a water bath to obtain solution B;

[0040] 3) Pour the obtained solution B into solution A, stir vigorously in a constant temperature water bath at 60°C at a speed...

Embodiment 2

[0046] A layered lithium-rich cathode material containing oxygen vacancies, the lithium-rich manganese-based cathode material contains Li, Mn, Ni, Co and O elements.

[0047] The preparation method of the above-mentioned lithium-rich manganese-based positive electrode material specifically includes the following steps:

[0048] 1) Dissolve 0.8112g of oxalic acid dihydrate in 60mL of a mixed solvent of ethanol and water (the volume ratio of ethanol and water is 1:0.5), stir and dissolve in a constant temperature water bath at 60°C to obtain solution A;

[0049] 2) Dissolve soluble 0.4820g lithium acetate, 0.4902g manganese acetate, 0.1244g nickel acetate and 0.1245g cobalt acetate in a mixed solvent of 60ml ethanol and water (the volume ratio of ethanol and water is 1:0.5), and keep the temperature at 60°C Stir in a water bath to obtain solution B;

[0050] 3) Pour the obtained solution B into solution A, and dry at 400rpm in a constant temperature water bath at 70°C, and dry ...

Embodiment 3

[0053] A layered lithium-rich cathode material containing oxygen vacancies, the lithium-rich manganese-based cathode material contains Li, Mn, Ni, Co and O elements.

[0054] The preparation method of the above-mentioned lithium-rich manganese-based positive electrode material specifically includes the following steps:

[0055] 1) Dissolve 0.8112g of oxalic acid dihydrate in 60mL of a mixed solvent of ethanol and water (the volume ratio of ethanol and water is 1:0.6), stir and dissolve in a constant temperature water bath at 60°C to obtain solution A;

[0056] 2) Dissolve soluble 0.4820g lithium acetate, 0.4902g manganese acetate, 0.1244g nickel acetate and 0.1245g cobalt acetate in a mixed solvent of 60ml ethanol and water (the volume ratio of ethanol and water is 1:0.6), and keep the temperature at 60°C Stir in a water bath to obtain solution B;

[0057] 3) Pour the obtained solution B into solution A, dry it in a constant temperature water bath at 60°C at a speed of 500rpm...

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Abstract

The invention provides an oxygen vacancy-containing layered lithium-rich cathode material preparation method. The method is characterized by comprising the following steps: an oxalate precipitant is dissolved in a mixed solvent of ethanol and water to obtain a solution A; lithium salt, nickel salt, cobalt salt and manganese salt are dissolved in the mixed solvent of ethanol and water to obtain a solution B; the solution B is poured into the solution A, a precursor is obtained after stirring and drying, and a lithium-rich cathode material is obtained through staged calcination; and the lithium-rich cathode material is placed in a hydrogen-argon mixed gas for low-temperature calcinations, and after cooling, an oxygen vacancy-containing layered lithium-rich cathode material is obtained. The material synthesized in the invention has a stable chemical structure and excellent cycle performance.

Description

technical field [0001] The invention belongs to the technical field of cathode materials for lithium ion batteries, and relates to a layered lithium-rich cathode material containing oxygen vacancies. Background technique [0002] Lithium-ion battery cathode material since the first commercial LiCoO 2 Since then, the actual capacity that can be used is only 50% of its theoretical capacity (140mAh / g). After continuous exploration by scientific researchers, the lithium-rich manganese-based cathode material Li 1.2 mn 0.54 Ni 0.13 co 0.13 o 2 The theoretical specific capacity is greater than 250mAh / g, and the energy density is greater than 300Wh / kg. Due to its good thermal stability, wide charge-discharge voltage range, low price, and environmental friendliness, it has become the most promising next-generation cathode material. [0003] At present, there are still some problems in the electrochemical performance of the synthesized lithium-rich manganese-based cathode materi...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M10/0525
CPCY02E60/10
Inventor 徐群杰朱庆鹏王啸张靖泽闵宇霖
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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