Positive electrode active material, preparation method thereof and sodium ion battery

A cathode active material, sodium-ion battery technology, applied in active material electrodes, positive electrodes, secondary batteries and other directions, can solve the problems of limited commercialization process, poor electrochemical performance, etc., to improve capacity performance and Coulomb efficiency, high The effect of charge-discharge specific capacity and high first-cycle Coulomb efficiency

Active Publication Date: 2020-08-18
CONTEMPORARY AMPEREX TECH CO
View PDF6 Cites 14 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, sodium-based layered transition metal oxides face the problem of poor electrochemical performance during use, which limits their commercialization.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Positive electrode active material, preparation method thereof and sodium ion battery
  • Positive electrode active material, preparation method thereof and sodium ion battery
  • Positive electrode active material, preparation method thereof and sodium ion battery

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0047] Next, a preparation method of the positive electrode active material in the present application will be described. According to this preparation method, the above-mentioned positive electrode active material can be prepared. The preparation method comprises the following steps:

[0048] S10, the preparation step of sodium transition metal oxide, mixing L source, Na source, M source, Cu source, Fe source, Mn source and X source according to the preset ratio, and heat treatment in oxygen-containing atmosphere to obtain sodium transition metal oxide Metal oxide.

[0049] S20, a washing treatment step, using a washing solution to wash the sodium transition metal oxide, the pH of the washing solution is 3-13, preferably 6-12.

[0050] S30, a re-washing treatment step, using deionized water to perform a re-washing treatment on the sodium transition metal oxide after the washing treatment.

[0051] S40, a drying treatment step, drying the sodium transition metal oxide after...

Embodiment 1

[0094] Preparation of cathode active material

[0095] Sodium carbonate (Na 2 CO 3 ), copper oxide (CuO), iron oxide (Fe 2 o 3 ) and manganese carbonate (MnCO 3 ) according to the molar ratio Na 2 CO 3 :CuO:Fe 2 o 3 :MnCO 3 =0.35:0.1:0.225:0.45 mixed evenly, that is to say that the actual mass of the Na source in the mixed raw material is 100% of the theoretical mass, after that, the relative humidity is 4% of the air atmosphere, 950 ℃ for 12 hours, after natural cooling, Sodium transition metal oxide Na 0.7 Cu 0.1 Fe 0.45 mn 0.45 o 2 . The resulting sodium transition metal oxide was ground into D v 50≈8μm, D v 99≈45μm, and then mixed with an appropriate amount of pH=6 washing solution (the detergent is acetic acid) to form a mixed material with a solid content of 30wt%, stirred at 30°C at a speed of 200rpm for 10min, repeated washing 3 times, and then transitioned with sodium Wash again with deionized water of equal quality to the metal oxide, repeat the wa...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
particle sizeaaaaaaaaaa
particle sizeaaaaaaaaaa
specific surface areaaaaaaaaaaa
Login to view more

Abstract

The invention discloses a positive electrode active material, a preparation method thereof and a sodium ion battery. The molecular formula of the positive electrode active material is LxNayMzCu [alpha] Fe [beta] Mn [gamma] O2 + [delta]-0.5 [eta] X [eta], wherein L is an alkali metal site doped substituted element, m is a transition metal site doped substituted element, and x is an oxygen site doped substituted element; 0 < = x < 0.35, 0.65 < = y < = 1, 0 (alpha < = 0.3, 0 (beta < = 0.5, 0 (gamma < = 0.5,-0.03 < = delta < = 0.03, 0 < = eta < = 0.1, z + alpha + beta + gamma = 1, mx + y + nz + 2alpha + 3beta + 4gamma = 2 (2 + delta), m is the valence state of L, n is the valence state of M, and the pH value of the positive electrode active material is 10.5 to 13. The positive electrode activematerial provided by the invention has higher capacity performance and coulombic efficiency.

Description

technical field [0001] The application belongs to the technical field of energy storage devices, and in particular relates to a positive electrode active material, a preparation method thereof and a sodium ion battery. Background technique [0002] At present, lithium-ion batteries occupy the core position of power batteries. At the same time, lithium-ion batteries are also facing great challenges, such as the increasing shortage of lithium resources, the rising price of upstream materials, the lag in the development of recycling technology, and the recycling rate of old batteries. Low and so on. Sodium-ion batteries can use the deintercalation process of sodium ions between the positive and negative electrodes to achieve charge and discharge, and the reserves of sodium resources are far more abundant than lithium, the distribution is wider, and the cost is much lower than lithium. Therefore, sodium-ion batteries can be used as lithium batteries. An effective complement to ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/485H01M4/505H01M4/525H01M4/58H01M10/054
CPCH01M4/485H01M4/505H01M4/525H01M4/5825H01M10/054Y02E60/10H01M2004/028C01G49/0027C01G49/0072C01P2004/61C01P2006/12C01P2002/72C01P2002/78C01P2006/11C01G53/50C01P2002/52C01P2002/76C01P2006/10C01P2006/40H01M2004/021
Inventor 朱金友郭永胜梁成都刘倩林文光
Owner CONTEMPORARY AMPEREX TECH CO
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap