Micron hollow porous composite spherical sodium ion battery cathode material and preparation method thereof

A sodium-ion battery, hollow porous technology, applied in battery electrodes, positive electrodes, secondary batteries, etc., can solve problems such as insufficient rate performance and insufficient structural stability, and achieve shortening of the de-intercalation path, prevention of agglomeration, and rate of good performance

Active Publication Date: 2020-05-19
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] After the anode material of the sodium ion battery in the above invention is modified, there are still problems of insufficient structural stability and insufficient rate performance.

Method used

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  • Micron hollow porous composite spherical sodium ion battery cathode material and preparation method thereof
  • Micron hollow porous composite spherical sodium ion battery cathode material and preparation method thereof
  • Micron hollow porous composite spherical sodium ion battery cathode material and preparation method thereof

Examples

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Embodiment 1

[0052] (1) Weigh 5mol of nickel sulfate hexahydrate, 5mol of cobalt sulfate heptahydrate, and 20mol of manganese sulfate monohydrate, dissolve them in 20L of deionized water to form a 1.5mol / L mixed solution, and then prepare 1.5mol / L of carbonic acid Sodium solution, the ratio of the molar weight of nickel salt, cobalt salt, manganese salt to the molar weight of sodium carbonate is 1:1; with the 50L reactor as the reactor, the 20L mixed solution and the 20L sodium carbonate solution are separated by 2L through a peristaltic pump The speed of / h is added to the reaction kettle, and the co-precipitation reaction is carried out by stirring at a speed of 200r / min under the condition of 50°C; at the same time, the pH value of the reaction solution is adjusted to 8.0 by adding 12wt% ammonium bicarbonate, and then reacted for 6 hours. Adjust the pH value to 8.5 and react for 4 hours. After the obtained precipitate is washed, filtered and dried, nickel-cobalt-manganese carbonate is ob...

Embodiment 2

[0059] (1) Weigh 1.5mol nickel acetate tetrahydrate, 1.5mol cobalt acetate tetrahydrate, and 12mol manganese acetate tetrahydrate, dissolve them in 10L deionized water to form a 1.5mol / L mixed solution, and then prepare lye, alkali The liquid contains 1.5 mol / L sodium hydroxide and 0.003 mol / L ammonia water at the same time, the ratio of the sum of the molar weight of nickel salt, cobalt salt and manganese salt to the molar weight of lye solute is 1:2; a 50L reactor is used as the reactor , 10L mixed solution and 20L lye solution were added to the reaction kettle at a speed of 1L / h and 2L / h through a peristaltic pump, and the co-precipitation reaction was carried out at a speed of 250r / min under the condition of 55°C; by adding 12wt% ammonia water adjusts the pH value of the reaction solution to 7.5 and reacts for 4 hours, then adjusts the pH value to 9 and reacts for 6 hours, and the obtained precipitate is washed, filtered and dried to obtain the hydroxide of nickel-cobalt-ma...

Embodiment 3

[0066] (1) Weigh 5mol of nickel oxalate dihydrate, 5mol of cobalt oxalate dihydrate, and 20mol of manganese chloride tetrahydrate, and dissolve them in 20L of deionized water to form a mixed solution of 1.5mol / L; then prepare lye, alkali The liquid contains 2mol / L sodium carbonate and 0.002mol / L ammonia water at the same time, the ratio of the sum of the molar weight of nickel salt, cobalt salt and manganese salt to the molar weight of lye solute is 1:1.5; with the 50L reactor as the reactor, pass The peristaltic pump adds 20L mixed solution and 22.5L lye into the reaction kettle at a speed of 2L / h and 2.25L / h respectively, and stirs at a speed of 240r / min under the condition of 52°C for coprecipitation reaction; by adding 12wt % ammonia water to adjust the pH value of the reaction solution to 7.5 and react for 4 hours, then adjust the pH value to 8.5 and react for 6 hours, and the resulting precipitate is filtered and dried to obtain nickel-cobalt-manganese carbonate; the dryi...

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Abstract

The invention discloses a micron hollow porous composite spherical sodium ion battery cathode material and a preparation method thereof. The cathode material is of a micron-sized hollow porous composite spherical structure, is formed by self-assembling a sheet-shaped structure and a needle-shaped structure, and has a chemical formula of NaxMn1-y-zNiyCozO2, wherein 0<x<=1, 0<=y<=1, 0<=z<=1, and 0<=y+z<=1. The invention also comprises a preparation method of the battery cathode material. The hollow sphere structure of the cathode material shortens the de-intercalation path of sodium ions; the needle-shaped structure provides more attachment sites for sodium ions and is beneficial to preventing agglomeration among particles; the porous structure is beneficial to the contact of the material with a conductive agent and an electrolyte, so that the conductivity of an electrode prepared from the material is improved; the battery positive electrode material is good in structural stability, anda battery assembled by an electrode prepared from the material is good in rate capability; the method is simple in process, required equipment is consistent with an existing industrialized lithium cobalt oxide and nickel-cobalt-manganese ternary cathode material process, and the lithium cobalt oxide and nickel-cobalt-manganese ternary cathode material can be directly produced by an existing production line.

Description

technical field [0001] The invention relates to a sodium ion battery cathode material and a preparation method thereof, in particular to a micron hollow porous spherical sodium ion battery cathode material and a preparation method thereof. Background technique [0002] With the rapid development of social science and technology, the demand for energy is becoming more and more extensive. Lithium-ion batteries are widely used in electronic products due to their good cycle performance and high energy density. However, due to the small reserves of lithium resources, high prices and certain safety hazards in lithium batteries, it is difficult to obtain larger-scale applications. [0003] Sodium is the sixth most abundant element in the earth's crust. It is widely distributed in the land and ocean mainly in the form of salt. It is rich in resources and relatively low in price. Because sodium and lithium are in the same main group in the periodic table, including two The physical ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M10/054
CPCH01M4/362H01M4/505H01M4/525H01M10/054H01M2004/028H01M2004/021Y02E60/10
Inventor 贺振江周志伟罗紫艳郑俊超李运姣
Owner CENT SOUTH UNIV
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