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Modified sodium ion positive electrode material, modified sodium ion electrode and preparation method

A positive electrode material, sodium ion technology, applied in the direction of positive electrode, active material electrode, battery electrode, etc., can solve the problem that no one has reported the mechanism of sodium ion positive electrode, and achieve improved cycle stability, low price, and improved high-temperature cycle performance Effect

Inactive Publication Date: 2021-06-15
天津中电新能源研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Moreover, the mechanism of the sodium ion positive electrode prepared by detailed anion doping has not been reported.

Method used

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  • Modified sodium ion positive electrode material, modified sodium ion electrode and preparation method
  • Modified sodium ion positive electrode material, modified sodium ion electrode and preparation method
  • Modified sodium ion positive electrode material, modified sodium ion electrode and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The preparation method of modified sodium ion positive electrode comprises the steps:

[0035] a. Weigh Na 2 CO 3 , NiO, MnCO 3 , so that the corresponding molar stoichiometric ratio is mixed evenly according to 1.03:0.5:0.5, and then PVDF is added to make the proportion of F element 0.01, and an appropriate amount of NMP is added to make it evenly mixed, dried, and then passed through 10° / min , heated to 850°C, maintained for calcination for 20 hours, then naturally cooled to room temperature, and the corresponding product was obtained after grinding, which was the modified sodium ion positive electrode material, and put it into a glove box filled with argon for standby;

[0036] b. Adding polyvinylidene fluoride to N-methylpyrrolidone and stirring to dissolve the polyvinylidene fluoride to obtain a polyvinylidene fluoride solution with a mass concentration of 5%;

[0037] c. Add acetylene black and modified sodium ion positive electrode material in turn, stir and d...

Embodiment 2

[0039] The preparation method of modified sodium ion positive electrode comprises the steps:

[0040] a. Weigh Na 2 CO 3 , NiO, MnCO 3 、TiO 2, so that the corresponding molar stoichiometric ratio is mixed uniformly according to 1.03:0.45:0.5:0.05, and then NaF is added to make the proportion of F element 0.03, and an appropriate amount of NMP is added to make it evenly mixed, dried, and then passed through 5° / min, heated to 900°C, maintained for calcination for 20 hours, then naturally cooled to room temperature, and the corresponding product was obtained through grinding, which was the modified sodium ion positive electrode material, and put it into a glove box filled with argon for standby;

[0041] b. Adding polyvinylidene fluoride to N-methylpyrrolidone and stirring to dissolve the polyvinylidene fluoride to obtain a polyvinylidene fluoride solution with a mass concentration of 6%;

[0042] c. Add acetylene black and modified sodium ion positive electrode material in ...

Embodiment 3

[0044] The preparation method of modified sodium ion positive electrode comprises the steps:

[0045] a. Weigh Na 2 CO 3 , NiO, MnCO 3 , so that the corresponding molar stoichiometric ratio is mixed uniformly according to 2:1:3, and then NaF is added to make the proportion of F element 0.05, and an appropriate amount of ethanol is added to make it evenly mixed, dried, and then passed through 5° / min , heating to 920°C, maintaining calcination for 12 hours, then naturally cooling to room temperature, and grinding to obtain the corresponding product, which is the modified sodium ion positive electrode material, and put it into a glove box filled with argon for standby;

[0046] b. Adding polyvinylidene fluoride to N-methylpyrrolidone and stirring to dissolve the polyvinylidene fluoride to obtain a polyvinylidene fluoride solution with a mass concentration of 6%;

[0047] c. Add acetylene black and modified sodium ion positive electrode material in turn, stir and disperse to fo...

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Abstract

The invention relates to a modified sodium ion positive electrode material, a modified sodium ion electrode and a preparation method. A sodium source, a metal element and a fluorine source are mixed and sintered to form the modified sodium ion positive electrode material, the molar ratio of the F element is 0.01-50%, the modified sodium ion positive electrode material, an adhesive and a conductive agent are prepared into slurry, the surface of an aluminum foil is coated with the slurry to prepare a sodium ion modified electrode. The beneficial effects are that the specific capacity of the modified sodium ion positive electrode material can be remarkably improved, the cycling stability of the material under high multiplying power is improved, and the high-temperature cycling performance of the prepared modified sodium ion positive electrode can also be improved; and the material is prepared only through a high-temperature calcination method, and is simple in process, low in price and suitable for industrial production.

Description

technical field [0001] The invention belongs to the field of sodium ion batteries, and in particular relates to a modified sodium ion positive electrode material, a modified sodium ion electrode and a preparation method. Background technique [0002] At present, with the continuous development of the new energy industry, people are paying attention to the energy storage density, but also urgently need to reduce the cost of raw materials; due to the uneven distribution of global lithium resources, the prices of raw materials such as lithium-containing ores have continued to rise in recent years , so that the cost of battery manufacturing continues to increase, which seriously hinders the continuous development of the new energy industry; because sodium and lithium are in the same main group, the resources are very rich, and they have similar physical and chemical properties; when prepared into corresponding electrode materials, the performance It has the same properties as th...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/525H01M4/485H01M4/131H01M4/1391H01M10/054C01B11/18C01G31/00C01G45/12C01G53/00
CPCC01B11/18C01G31/00C01G45/12C01G53/44C01P2006/40H01M4/131H01M4/1391H01M4/485H01M4/505H01M4/525H01M10/054H01M2004/021H01M2004/028Y02E60/10
Inventor 刘凯许寒刘兴江
Owner 天津中电新能源研究院有限公司
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