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A spherical sodium ion battery positive electrode quaternary material and a preparation method thereof

A sodium ion battery and sodium ion technology, applied in battery electrodes, electrical components, secondary batteries, etc., can solve the problems of discharge average voltage drop, cycle specific capacity drop, short service life, etc., and achieve the suppression of P2-O2 phase transition , improve stability, uniform shape

Active Publication Date: 2018-12-11
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the irreversible phase transition between P2-O2 when it is charged to 4.2V, Na 0.67 Ni 0.33 mn 0.67 o 2 Poor material circulation and short service life
Studies have shown that some inactive metal elements (such as Mg, Ti, Li, Zn, etc.) can inhibit the P2-O2 phase transition and the John-Teller effect at high voltages, thereby improving the P2-type Na to a certain extent. 0.67 Ni 0.33 mn 0.67 o 2 The cycle performance of the positive electrode material, but there will be some corresponding problems, such as a sharp drop in the average discharge voltage, a drop in the cycle specific capacity, and poor rate performance, etc.
Wang et al. prepared magnesium-substituted P2-type Na 0.67 mn 0.67 Ni 0.28 Mg 0.05 o 2 , although cycle performance is improved, but only 120mAhg -1 The specific capacity (0.1C), the average discharge voltage of 3.5V and the extremely poor rate performance, the material is only 20mAhg at 2C -1 specific capacity (P.F.Wang, Y.You, Y.X.Yin, Y.S.Wang, L.J.Wan, L.Gu, Y.G.Guo, Angew.Chem., Int.Ed.2016, 55, 7445.)

Method used

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  • A spherical sodium ion battery positive electrode quaternary material and a preparation method thereof
  • A spherical sodium ion battery positive electrode quaternary material and a preparation method thereof
  • A spherical sodium ion battery positive electrode quaternary material and a preparation method thereof

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Embodiment 1

[0033] An embodiment of the present invention provides a method for preparing a positive electrode quaternary material for a spherical sodium ion battery, comprising the following steps:

[0034](1) According to the ratio of Mn:Ni:Cu:Mg=0.6:0.2:0.1:0.1, weigh manganese acetate, nickel acetate, copper acetate and magnesium acetate in total 0.025mol, put them into a 200mL beaker, add 35mL water to prepare a mixed Add 45 mL of ethylene glycol and 0.125 mol of urea to the salt solution, stir at room temperature for 6 hours, then transfer to a high-pressure reactor, and react at 200°C for 15 hours. After the reaction, wash the precipitate obtained three times with deionized water and ethanol , and then placed in an oven at 80°C, dried for 24 hours to obtain a solid powder;

[0035] (2) Add the solid powder to 2 mL of deionized water, then add 0.00875 mol of anhydrous sodium carbonate, stir and disperse at 50°C until the water evaporates, and then put it in an oven to dry at 80°C to...

Embodiment 2

[0046] An embodiment of the present invention provides a method for preparing a positive electrode quaternary material for a spherical sodium ion battery, comprising the following steps:

[0047] (1) According to the ratio of Mn: Ni: Cu: Mg = 0.6: 0.2: 0.05: 0.15, weigh manganese sulfate, nickel sulfate, copper sulfate and magnesium sulfate in total 0.025mol, put them into a 200mL beaker, add 35mL water to prepare a mixed Salt solution, then add 40 mL of ethylene glycol, 0.1 mol of urea, stir at room temperature for 6 hours, transfer to a high-pressure reactor, and react at 180 ° C for 20 hours. After the reaction, the obtained precipitate is washed three times with deionized water and ethanol , and then placed in an oven at 80°C, dried for 24 hours to obtain a solid powder;

[0048] (2) Add the solid powder to 2 mL of deionized water, then add 0.00875 mol of anhydrous sodium carbonate, stir and disperse at 50°C until the water evaporates, and then put it in an oven to dry at ...

Embodiment 3

[0051] An embodiment of the present invention provides a method for preparing a positive electrode quaternary material for a spherical sodium ion battery, comprising the following steps:

[0052] (1) Weigh a total of 0.025mol of manganese nitrate, nickel nitrate, copper nitrate and magnesium nitrate according to the ratio of Mn:Ni:Cu:Mg=0.6:0.2:0.12:0.08, put them into a 200mL beaker, add 35mL of water to prepare a mixed Salt solution, then add 55 mL of ethylene glycol, 0.12 mol of urea, stir at room temperature for 6 hours, transfer to a high-pressure reactor, and react at 150 ° C for 24 hours. After the reaction, the obtained precipitate is washed three times with deionized water and ethanol , and then placed in an oven at 80°C, dried for 24 hours to obtain a solid powder;

[0053] (2) Add the solid powder to 2 mL of deionized water, then add 0.00875 mol of anhydrous sodium carbonate, stir and disperse at 50°C until the water evaporates, and then put it in an oven to dry at ...

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Abstract

The invention discloses a spherical sodium ion battery positive electrode quaternary material and a preparation method thereof, belonging to the technical field of sodium ion batteries, its chemical formula is: Na0.5Mn0.6Ni0.2CuxMgyO2, x represents the doping amount of Cu and y represents the doping amount of Mg, wherein 0 (x <=0. 1, 0 (y <= 0. 1, x+y=0. 2), the spherical sodium ion battery positive electrode quaternary material of the invention has high energy density, high voltage, long cycle life and excellent rate performance; The spherical sodium ion battery positive electrode quaternarymaterial of the invention is P2 type structure, and the material has sodium ions (Nae and Naf) at two positions, and the ratio of the sodium ions is Nae: Naf=0. 25: 0.25, which has strong symmetry, thereby improving the stability of the structure in the charging and discharging process; The invention has the advantages of simple preparation process, stable performance, low cost, obvious modification of electrochemical performance, and can meet the requirements of industrial production.

Description

technical field [0001] The invention belongs to the technical field of sodium ion batteries, and in particular relates to a spherical sodium ion battery cathode quaternary material and a preparation method thereof. Background technique [0002] Due to the advantages of high operating voltage, large specific capacity and long cycle life, lithium-ion batteries have become the first choice for power batteries and energy storage systems. However, with the real arrival of the new energy era, due to the lack of lithium resources, it will not be able to effectively meet the large-scale application needs of power batteries, which will lead to a sharp rise in the price of lithium raw materials, increase battery costs, and hinder the development of new energy industries. Due to its low price, abundant natural resources, and similar electrochemical performance to lithium-ion batteries, sodium-ion batteries have great advantages and development prospects in large-scale energy storage ap...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/505H01M4/525H01M10/054
CPCH01M4/366H01M4/485H01M4/505H01M4/525H01M10/054Y02E60/10
Inventor 陈涛刘维芳刘开宇颜军
Owner CENT SOUTH UNIV
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