Method for constructing sodium-ion battery layered metal oxide ordered structure to improve air stability of sodium-ion battery layered metal oxide ordered structure

An oxide and layered technology, which is applied in the field of electrochemical power sources, can solve the problems of short service life and poor electrochemical performance of layered oxides, and achieve improved air stability, simple and easy preparation process, and rich and extensive sources of raw materials. Effect

Pending Publication Date: 2021-10-22
FUJIAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the contact between the air-unstable cathode layered oxide material and the air usually produces cracks, electrical insulating substances, and hydration, which lead to a shorter life of the layered oxide after air exposure, and the electrochemical worse performance

Method used

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  • Method for constructing sodium-ion battery layered metal oxide ordered structure to improve air stability of sodium-ion battery layered metal oxide ordered structure
  • Method for constructing sodium-ion battery layered metal oxide ordered structure to improve air stability of sodium-ion battery layered metal oxide ordered structure
  • Method for constructing sodium-ion battery layered metal oxide ordered structure to improve air stability of sodium-ion battery layered metal oxide ordered structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Preparation of NaNi 2 / 3 Ir 1 / 3 o 2 Cathode material

[0028] Weigh Na according to the corresponding proportion 2 CO 3 , NiO, IrO 2 , ball milled for 24h, pressed into a disc with a diameter of 10mm under a pressure of 10MPa, and calcined at 950°C for 15h in a muffle furnace to obtain a sample powder.

[0029] (2) For NaNi 2 / 3 Ir 1 / 3 o 2 Sample powder for XRD test

[0030] Using an X-ray diffractometer, NaNi is obtained by using the diffraction effect of X-rays in crystalline substances 2 / 3 Ir 1 / 3 o 2 The XRD pattern of the sample powder is used to analyze the material effectively with reference to the standard PDF card.

[0031] (3) Preparation of NaNi 2 / 3 Ir 1 / 3 o 2 Composite cathode

[0032] The prepared positive electrode material is uniformly mixed with the conductive additive Super-P and the binder polyvinylidene fluoride (PVDF) in a mass ratio of 8:1:1, and the solvent N-methylpyrrolidone is added to make pulp, smear, drying and other process...

Embodiment 2

[0038] (1) Preparation of NaMg 2 / 3 V 1 / 3 o 2 Cathode material. (Raw material is Na 2 CO 3 , MgO, VO 2 , and all the other steps are the same as in Example 1. )

[0039] (2) For NaMg 2 / 3 V 1 / 3 o 2 Sample powder carries out XRD test (concrete steps are with embodiment 1)

[0040] (3) Preparation of NaMg 2 / 3 V 1 / 3 o 2 Composite positive electrode (concrete steps are with embodiment 1)

[0041] (4) assemble sodium ion battery (concrete steps are with embodiment 1)

[0042] (5) Sodium ion battery test (concrete steps are the same as embodiment 1)

Embodiment 3

[0044] (1) Preparation of NaCu 2 / 3 Sb 1 / 3 o 2 Cathode material. (Raw material is Na2 CO 3 , CuO, Sb 2 o 3 , and all the other steps are the same as in Example 1. )

[0045] (2) For NaCu 2 / 3 Sb 1 / 3 o 2 Sample powder carries out XRD test (concrete steps are with embodiment 1)

[0046] (3) Preparation of NaCu 2 / 3 Sb 1 / 3 o 2 Composite positive electrode (concrete steps are with embodiment 1)

[0047] (4) assemble sodium ion battery (concrete steps are with embodiment 1)

[0048] (5) Sodium ion battery test (concrete steps are the same as embodiment 1)

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Abstract

The invention discloses a method for constructing a sodium-ion battery layered metal oxide ordered structure to improve the air stability of the sodium-ion battery layered metal oxide ordered structure. Transition metal ions with large ion radius difference are selected to construct transition metal layer ordered arrangement, so that the air stability of a sodium-ion layered positive electrode material Na<m>A<x>B<1-x>O<2> is further improved, m is more than or equal to 0.45 and less than or equal to 1, and x is more than or equal to 0 and less than or equal to 1. As a disordered structure material is easily influenced by factors such as water and carbon dioxide in air, the content of sodium ions in the material is reduced or a hydrated phase structure is formed, the performance of the material becomes poor, and the electrochemical performance is degraded. Under the condition, a sodium-ion battery layered metal oxide ordered structure is constructed for improving the air stability, a new insight is provided for the optimization design of a high-performance sodium-ion battery positive electrode layered material, and the method has a wide application prospect.

Description

technical field [0001] The invention belongs to the field of electrochemical power sources, and in particular relates to a method for constructing an ordered structure of a sodium-electric layered metal oxide to improve its air stability. Background technique [0002] As people's concerns about environmental issues and the rapid consumption of fossil fuels continue to grow, the strong demand for the utilization of renewable energy and the promotion of smart grids in modern society has promoted the development of advanced energy storage technologies, and the demand for large-scale electrochemical energy storage systems is in has received considerable attention in the past few decades. Among various electrical energy storage systems, rechargeable batteries are considered to be one of the most typical representatives of advanced energy storage technologies due to their high safety, high conversion efficiency, low cost, and environmental friendliness. Alkali metal ion batteries...

Claims

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Application Information

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IPC IPC(8): H01M4/525H01M4/485H01M4/131H01M10/054H01M10/058
CPCH01M4/525H01M4/485H01M4/131H01M10/058H01M10/054Y02P70/50Y02E60/10
Inventor 姚胡蓉甘露袁新光
Owner FUJIAN NORMAL UNIV
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