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Coating method of sodium ion battery positive electrode material and secondary battery thereof

A technology for sodium ion batteries and cathode materials, which is applied in secondary batteries, battery electrodes, circuits, etc., can solve the problems of waste liquid, unsatisfactory economy, and unsatisfactory coating effect in the treatment method, and improve the cycle stability. , good coating effect, uniform coating effect

Inactive Publication Date: 2019-04-16
BEIJING HINA BATTERY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The solid-phase method is to simply mix the coating material and the layered material through the solid-phase method. This method is economical, but the coating effect is not ideal; the liquid-phase method is to stir the layered material and the coating in a liquid, so that To make it evenly coated, in the liquid phase method, centrifugation or filtration is often used for subsequent treatment, but there are problems such as waste liquid in this treatment method, and the subsequent long-term drying also brings unsatisfactory economical problems

Method used

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  • Coating method of sodium ion battery positive electrode material and secondary battery thereof
  • Coating method of sodium ion battery positive electrode material and secondary battery thereof
  • Coating method of sodium ion battery positive electrode material and secondary battery thereof

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preparation example Construction

[0032] The invention provides a method for preparing a secondary battery comprising a sodium ion positive electrode material, comprising the following steps:

[0033] Mix the active material of the prepared sodium ion positive electrode material with conductive carbon black and polyvinylidene fluoride binder in a mass ratio of 7:2:1, and add N-methylpyrrolidone solution until it is in a dry environment at room temperature Grinding to form a slurry;

[0034] Apply the prepared slurry evenly on the aluminum foil of the current collector, and cut it into a circular pole piece with a diameter of 12mm after the initial drying;

[0035] The circular pole piece was dried at 120° C. under vacuum for 12 hours and then transferred to a glove box for use.

[0036] In addition, the present invention also provides a sodium ion secondary battery, which comprises the above-mentioned positive electrode material of the sodium ion battery.

[0037] Further, the present invention also provides...

Embodiment 1

[0039] Based on the above coating method, firstly, the positive electrode material is selected as Na 0.9 Cu 0.22 Fe 0.30 mn 0.48 o 2 , which is recorded as raw material 1, and its particle size D50 is 10 μm. The coating precursor is aluminum nitrate, and the solvent is water. Then, put an appropriate amount of water in the mixing tank, gradually add 100kg of positive electrode material and 1kg of coated precursor, fully stir and disperse, and use spray drying equipment for rapid drying, and collect the precursor coated positive electrode material. Finally, the collected positive electrode material is subjected to secondary sintering, the sintering temperature is 700 degrees, and the time is 8 hours, wherein the aluminum nitrate is decomposed into aluminum oxide on the surface of the positive electrode material, that is, the alumina-coated positive electrode material is obtained. , recorded as coating material 1.

[0040]A secondary battery is prepared according to the ab...

Embodiment 2

[0043] Based on the above coating method, firstly, the positive electrode material is selected as Na 1.0 Ni 0.22 Cu 0.11 Fe 0.33 mn 0.33 o 2 , recorded as raw material 2, its particle size D50 is 10 μm, the coating precursor is magnesium oxalate, and the solvent is water. Then, put an appropriate amount of water in the mixing tank, gradually add 100kg of positive electrode material and 2kg of coated precursor, fully stir and disperse, and use spray drying equipment for rapid drying, and collect the precursor coated positive electrode material. Finally, the collected positive electrode material is subjected to secondary sintering, the sintering temperature is 900 degrees, and the time is 6 hours, wherein the magnesium oxalate is decomposed into magnesium oxide on the surface of the material, that is, the positive electrode material coated with magnesium oxide is obtained, which is recorded as Covering material 2.

[0044] A secondary battery is prepared according to the a...

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Abstract

The invention discloses a coating method of a sodium ion battery positive electrode material, which comprises the following steps: step 100, sequentially adding a solvent, a positive electrode material and a coating precursor into a stirring tank, and uniformly stirring and mixing the solvent and the coating precursor; step 200, carrying out spray drying on the mixture through spray drying equipment to obtain a positive electrode material coated with the coated precursor; step 300, performing secondary sintering on the positive electrode material coated with the coating precursor to form an oxide shell so as to obtain an oxide coated positive electrode material. According to the invention, uniform coating and rapid drying of the material are realized based on spray drying, so that the coating process is simpler, the coating effect is better and more uniform, the interface of the positive electrode material is optimized after coating, and the cycling stability of the sodium ion batteryis improved.

Description

technical field [0001] The invention relates to the field of battery technology, in particular to a coating method for a positive electrode material of a sodium ion battery and a secondary battery thereof. Background technique [0002] Like lithium-ion batteries, the research and development of sodium-ion batteries began in the 1970s. Because lithium-ion batteries quickly occupied the secondary battery market due to their advantages in energy density, the world's research and development efforts are concentrated on lithium-ion batteries, while sodium The development of ion batteries has encountered a cold period. However, the large-scale industrialization of lithium-ion batteries has exposed the problem of scarcity and uneven distribution of lithium resources, which has led researchers to turn their attention to sodium-ion batteries. Because sodium resources are abundant and evenly distributed globally. Moreover, the working principle and processing technology of sodium-io...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/48H01M4/505H01M4/525H01M10/054
CPCH01M4/48H01M4/505H01M4/525H01M10/054Y02E60/10
Inventor 戚兴国周文泽秦东唐堃胡勇胜
Owner BEIJING HINA BATTERY TECH CO LTD
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