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Sodium-rich transition metal oxide composite sodium-supplementing positive electrode active material, positive electrode material, positive electrode, preparation of positive electrode and application of positive electrode in sodium-ion battery

A cathode active material, transition metal technology, applied in circuits, electrical components, battery electrodes, etc., can solve the problems of harsh operating environment, low efficiency, complex operation process, etc., to reduce application difficulty, reduce cost, and simple synthesis process Effect

Active Publication Date: 2020-06-16
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at technical problems such as low efficiency of sodium supplementation in current sodium ion batteries, complex operation process and harsh requirements on the operating environment, the present invention provides a sodium-rich transition metal oxide composite sodium supplementation positive electrode active material; aiming at solving ICL, Improving the first discharge efficiency of sodium-ion batteries

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] 1. Na 3 V 2 (PO 4 ) 3 (79wt%), Na6CoO4 (1wt%), SuperP (10wt%) and PVDF (10wt%) were mixed evenly, and the positive electrode sheet was obtained by slurrying, coating, drying and rolling.

[0057] 2. After mixing hard carbon (90wt%), SuperP (5wt%) and PVDF (5wt%) uniformly, the negative electrode sheet is obtained by pulping, coating, drying and rolling.

[0058] 3. After assembling the positive and negative electrode sheets, a sodium ion battery is obtained, and the sodium supplementation of the negative electrode material is realized in the first charge and discharge cycle. The conditions for the first charge-discharge cycle are as follows:

[0059] Table 1: The first charge and discharge cycle conditions in Example 1:

[0060] cycle starting voltage cut-off voltage mechanism first charge OCV 4.5V Constant current charging (0.02C) first discharge 4.5V 3.0V Constant current discharge (0.02C)

[0061] It was determined that the...

Embodiment 2

[0063] 1. Na 3 V 2 (PO 4 ) 3 (77wt%), Na6CoO4 (3wt%), SuperP (10wt%) and PVDF (10wt%) are uniformly mixed, and the positive electrode sheet is obtained by slurrying, coating, drying and rolling.

[0064] 2. After mixing hard carbon (90wt%), SuperP (5wt%) and PVDF (5wt%) uniformly, the negative electrode sheet is obtained by pulping, coating, drying and rolling.

[0065] 3. After assembling the positive and negative electrode sheets, a sodium ion battery is obtained, and the sodium supplementation of the negative electrode material is realized in the first charge and discharge cycle. The conditions for the first charge-discharge cycle are as follows:

[0066] Table 1: The first charge and discharge cycle conditions in Example 1:

[0067] cycle starting voltage cut-off voltage mechanism first charge OCV 4.5V Constant current charging (0.02C) first discharge 4.5V 3.0V Constant current discharge (0.02C)

[0068] It was determined that th...

Embodiment 3

[0070] 1. Na 3 V 2 (PO 4 ) 3 (75wt%), Na6CoO4 (5wt%), SuperP (10wt%) and PVDF (10wt%) were mixed evenly, and then the positive electrode sheet was obtained by slurrying, coating, drying and rolling.

[0071] 2. After mixing hard carbon (90wt%), SuperP (5wt%) and PVDF (5wt%) uniformly, the negative electrode sheet is obtained by pulping, coating, drying and rolling.

[0072] 3. After assembling the positive and negative electrode sheets, a sodium ion battery is obtained, and the sodium supplementation of the negative electrode material is realized in the first charge and discharge cycle. The conditions for the first charge-discharge cycle are as follows:

[0073] Table 2: The first charge and discharge cycle conditions in Example 2:

[0074] cycle starting voltage cut-off voltage mechanism first charge OCV 4.5V Constant current charging (0.05C) first discharge 4.5V 3.0V Constant current discharge (0.05C)

[0075] It has been determine...

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Abstract

The invention belongs to the field of sodium-ion battery materials, and discloses a sodium-rich transition metal oxide composite sodium-supplementing positive electrode active material. The material is characterized by comprising a sodium-ion battery positive electrode active material and a sodium-supplementing additive; the sodium-supplementing additive is a sodium-rich transition metal oxide ofwhich the chemical formula is NaxMOy, wherein M is one or more of Ni, Co, Fe, Mn, Ru, Ir, Sn, Cr, Cu, Nb and Mo, x is 1-6, and y is 1-4; the average valence state of M in the sodium-supplementing additive is not higher than the highest oxidation valence state of M. The specific capacity of the sodium-supplementing additive is far higher than that of a conventional positive electrode active material; sodium ions can be removed before or together with the conventional active material in a charging process, meanwhile, the structure of the sodium-supplementing additive is changed, and sodium vacancies in the transition metal layer of the sodium-supplementing additive are difficult to fill.

Description

technical field [0001] The invention belongs to the field of sodium-ion battery energy storage devices, and in particular relates to a sodium-supplementing additive, a sodium-supplementing positive electrode of a sodium-ion battery, and a sodium-ion battery. Background technique [0002] Na-ion battery is a reliable choice to solve the problem of large-scale energy storage. Its working principle is similar to that of lithium-ion battery. It uses sodium ions to continuously intercalate and detach between the positive and negative electrodes to realize the battery can be charged and discharged. Compared with lithium-ion batteries, sodium-ion batteries have the advantages of rich sodium reserves, the use of low-concentration electrolytes, the use of aluminum foil as a current collector for the negative electrode, and no over-discharge characteristics, which can greatly reduce costs. [0003] Sodium-ion batteries and lithium-ion batteries belong to different fields. Although on ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/58H01M4/131H01M4/136H01M10/054
CPCH01M4/131H01M4/136H01M4/362H01M4/505H01M4/525H01M4/5825H01M10/054Y02E60/10
Inventor 张治安赖延清王大鹏李天伟洪波张凯李劼
Owner CENT SOUTH UNIV
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