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Layered positive electrode material of sodium-ion battery as well as preparation method and application thereof

A technology for sodium ion batteries and positive electrode materials, applied in battery electrodes, positive electrodes, secondary batteries, etc., can solve the problems of long-term cycle performance and poor transmission kinetics of positive electrode materials, and achieve suitable for large-scale production and simple preparation methods , the effect of good rate performance and cycle stability performance

Active Publication Date: 2020-06-12
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to address the deficiencies in the prior art, and the specific present invention provides a NaNi 0.5-x- y B x C y mn 0.5-z A z o 2 Layered cathode materials for small sodium-ion batteries to solve the problems of long-term cycle performance and poor transport kinetics of this type of cathode materials

Method used

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  • Layered positive electrode material of sodium-ion battery as well as preparation method and application thereof
  • Layered positive electrode material of sodium-ion battery as well as preparation method and application thereof
  • Layered positive electrode material of sodium-ion battery as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] (1) Preparation of cathode material NaNi 0.3 Li 0.1 Mg 0.1 mn 0.45 Nb 0.05 o 2

[0037] Accurately weigh the raw material Na with a corresponding proportion of purity > 99%. 2 CO 3 , NiO, Mn 2 o 3 , LiOH, (CH 3 COOH) 2 Mg, Nb 2 o 5, added to the ball mill, mechanical ball milled for 24 hours, and the obtained powder was pressed into a disc with a diameter of 14 mm under a pressure of 10 MPa. Pre-firing in the early stage; and then adopting a heating rate of 3°C / min, a temperature of 1000°C, and a holding time of 12 hours for post-sintering of the wafer, and finally cooling to room temperature with the furnace to obtain a black powdery positive electrode material.

[0038] (2) Preparation of NaNi 0.3 Li 0.1 Mg 0.1 Mn 0.45 Nb 0.05 O 2 Composite cathode

[0039] Mix the positive electrode material prepared in step (1) with Super P and the binder polyvinylidene fluoride at a mass ratio of 0.7:0.2:0.1, and add the solvent N-methylpyrrolidone, and process ...

Embodiment 2

[0043] The rest are the same as in Example 1, except that the magnesium doping amount of the positive electrode material prepared in step (1) is 5%, and 5% refers to the molar percentage of magnesium element in the total transition metal elements, and the prepared positive electrode material is NaNi 0.35 Li 0.1 Mg 0.05 Mn 0.45 Nb 0.05 O 2 .

Embodiment 3

[0045] The rest are the same as in Example 1, except that the lithium doping amount of the positive electrode material prepared in step (1) is 5%, and the prepared positive electrode material is NaNi 0.35 Li 0.05 Mg 0.1 Mn 0.45 Nb 0.05 O 2 .

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Abstract

The invention relates to a sodium ion battery layered positive electrode material, a preparation method and an application thereof, wherein the sodium ion battery layered positive electrode material is NaNi<0.5-x-y>B<x>C<y>Mn<0.5-z>A<z>O<2>, A is selected from one of Sn, Ti, Nb, Sb and Bi, and z is greater than or equal to 0.02 and less than or equal to 0.08; wherein B is selected from one of Cu or Li, and x is greater than or equal to 0.05 and less than or equal to 0.15; wherein C is selected from one of Mg, Ca and Ba, and y is greater than or equal to 0.05 and less than or equal to 0.12. According to the positive electrode material prepared by the invention, the original Ni site is replaced by the metal, which has the same valence state or lower valence state and is not easy to oxidize,so that the structural stability of the layered positive electrode material with the replaced Ni site is better, and the prepared battery has excellent long-cycle performance and transmission dynamicperformance. The positive electrode material prepared by the invention has good rate capability and cycling stability. The preparation method of the cathode material is simple, environment-friendly, pollution-free and suitable for large-scale production.

Description

technical field [0001] The invention belongs to the technical field of battery materials, and in particular relates to a layered positive electrode material for a sodium ion battery, a preparation method and an application thereof. Background technique [0002] Lithium-ion batteries are a new generation of green and environmentally friendly batteries. They have been widely used in mobile phones, computers, electric vehicles and other fields. However, lithium reserves in the earth's crust are small and the price is high, which makes lithium-ion batteries quite embarrassing. Sodium is an element with similar physical and chemical properties to lithium. It is widely distributed (the abundance in the earth's crust is 2.3-2.8%, which is about 12,500 times that of lithium), and it is cheap. Comparing two batteries, sodium ion Batteries have greater natural advantages and potential for sustainable development. [0003] Since 2010, most of the research on sodium-ion batteries has f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G53/00H01M4/485H01M4/505H01M4/525H01M10/054
CPCC01G53/006C01P2004/03C01P2004/61C01P2006/40H01M4/485H01M4/505H01M4/525H01M10/054H01M2004/028Y02E60/10
Inventor 郭玉国肖遥殷雅侠
Owner INST OF CHEM CHINESE ACAD OF SCI
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