Sodium ion doped ternary positive electrode material and preparation method thereof

A cathode material, a technology of sodium ions, applied in the field of sodium ion-doped ternary cathode materials and their preparation, can solve the problems of poor cycle performance and rate performance, and achieve improved cycle performance and rate performance, low price, good layered effect of structure

Pending Publication Date: 2020-07-28
JIANGNAN UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the invention is to solve LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 To solve the problem of poor cycle performance and rate performance of positive electrode materials, a sodium ion-doped ternary positive electrode material and its preparation method are provided. The material not only has a hollow structure, but also has a more uniform particle size and particle size distribution. improved

Method used

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  • Sodium ion doped ternary positive electrode material and preparation method thereof
  • Sodium ion doped ternary positive electrode material and preparation method thereof
  • Sodium ion doped ternary positive electrode material and preparation method thereof

Examples

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Effect test

Embodiment 1

[0026] (1) Dissolve manganese sulfate and ammonium bicarbonate in deionized water at a molar ratio of 1:10, mix the solutions, and stir for 3 hours at a stirring speed of 200-500 rpm; the resulting suspension is placed in circulating water suction filtration in a vacuum pump, and washed 3 times with deionized water, and washed 2 times with absolute ethanol to obtain manganese carbonate microspheres;

[0027] (2) Calcining manganese carbonate in a muffle furnace at a heating rate of 5°C / min, raising the temperature to 400-500°C, and calcining for 3-5 hours to obtain manganese dioxide hollow microspheres;

[0028] (3) Weigh lithium hydroxide, manganese dioxide, nickel nitrate and cobalt nitrate at a molar ratio of 1 : 1 / 3 : 1 / 3 : 1 / 3, add absolute ethanol, and dissolve the lithium hydroxide suspension (slightly soluble in absolute ethanol), manganese dioxide suspension (insoluble in absolute ethanol), nickel nitrate solution and cobalt nitrate solution are mixed in a clean large...

Embodiment 2

[0034] (1) Dissolve manganese sulfate and ammonium bicarbonate in deionized water at a molar ratio of 1:10, mix the solutions, and stir for 3 hours at a stirring speed of 200-500 rpm; the resulting suspension is placed in circulating water suction filtration in a vacuum pump, and washed 3 times with deionized water, and washed 2 times with absolute ethanol to obtain manganese carbonate microspheres;

[0035] (2) Calcining manganese carbonate in a muffle furnace at a heating rate of 5°C / min, raising the temperature to 400-500°C, and calcining for 3-5 hours to obtain manganese dioxide hollow microspheres;

[0036] (3) Weigh lithium hydroxide, anhydrous sodium acetate, manganese dioxide, nickel nitrate and cobalt nitrate at a molar ratio of 0.99 : 0.01 : 1 / 3 : 1 / 3 : 1 / 3, add absolute ethanol, and oxidize the hydroxide Lithium suspension (slightly soluble in absolute ethanol), manganese dioxide suspension (insoluble in absolute ethanol), nickel nitrate solution and cobalt nitrate ...

Embodiment 3

[0041] (1) Dissolve manganese sulfate and ammonium bicarbonate in deionized water at a molar ratio of 1:10, mix the solutions, and stir for 3 hours at a stirring speed of 200-500 rpm; the resulting suspension is placed in circulating water suction filtration in a vacuum pump, and washed 3 times with deionized water, and washed 2 times with absolute ethanol to obtain manganese carbonate microspheres;

[0042] (2) Calcining manganese carbonate in a muffle furnace at a heating rate of 5°C / min, raising the temperature to 400-500°C, and calcining for 3-5 hours to obtain manganese dioxide hollow microspheres;

[0043] (3) Weigh lithium hydroxide, anhydrous sodium acetate, manganese dioxide, nickel nitrate and cobalt nitrate at a molar ratio of 0.97 : 0.03 : 1 / 3 : 1 / 3 : 1 / 3, add absolute ethanol, and oxidize the hydroxide Lithium suspension (slightly soluble in absolute ethanol), manganese dioxide suspension (insoluble in absolute ethanol), nickel nitrate solution and cobalt nitrate ...

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Abstract

The invention relates to a sodium ion doped ternary positive electrode material and a preparation method thereof and belongs to the technical field of lithium ion batteries. A general chemical formulaof the positive electrode material is Li<1-x>Na<x>Ni<1/3>Co<1/3>Mn<1/3>O<2>, wherein x is greater than or equal to 0 and less than or equal to 0.05; a manganese source is manganese dioxide hollow microspheres. The preparation method comprises steps of weighing a lithium source, a sodium source, a nickel source, a manganese source and a cobalt source according to a molar ratio, and respectively adding solvent to form uniform solution or turbid liquid, and mixing the solution and the turbid liquid, heating to evaporate the solvent, calcining, grinding and cooling to room temperature twice to obtain the lithium ion battery positive electrode material. The preparation method is advantaged in that the preparation method is easy to operate, and the prepared positive electrode material retains ahollow structure and crystallinity and has advantages of high specific capacity, good cycle performance, good rate capability and the like.

Description

technical field [0001] The invention relates to a sodium ion-doped ternary positive electrode material and a preparation method thereof, belonging to the technical field of lithium ion batteries. Background technique [0002] Since its birth, lithium-ion batteries have attracted worldwide attention due to their advantages such as high capacity density, no pollution, and long cycle life, and have been widely used in portable electronic devices, large energy storage devices, electric vehicles and hybrid vehicles. Wait. Cathode materials play a decisive role in the price and performance of lithium-ion batteries. Traditional cathode materials mainly include LiCoO 2 , LiNiO 2 , LiMn 2 o 4 . LiCoO 2 As the first and most successful commercial battery material, it still occupies a very important position in the commercial market, but today LiCoO 2 It has been unable to meet the growing needs of the people. LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 and LiCoO 2 Compared to the integr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525H01M10/0525
CPCH01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 张海朗李祝愿
Owner JIANGNAN UNIV
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