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Positive plate and electrochemical battery

A technology of positive electrode sheet and positive electrode film, which is applied in the field of positive electrode sheet and electrochemical cell, can solve the problems of poor electronic conductivity, low conductivity, and inability to fully utilize the theoretical capacity of Prussian blue materials, and achieve good conductivity and reduce resistance. Effect

Active Publication Date: 2019-06-04
CONTEMPORARY AMPEREX TECH CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the electronic conductivity of the Prussian blue material itself is poor, and the electrical conductivity is low. The theoretical capacity of the Prussian blue material itself cannot be fully utilized after being prepared into a positive electrode sheet using conventional conductive agents, thus affecting the large-scale application of sodium-ion batteries.

Method used

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  • Positive plate and electrochemical battery
  • Positive plate and electrochemical battery
  • Positive plate and electrochemical battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] (1) Preparation of positive electrode sheet

[0039] Prussian blue material Na 2 MnFe(CN) 6 , the conductive agent multi-walled carbon nanotubes, the binder polyvinylidene fluoride (PVDF) and the organic solvent N-methylpyrrolidone (NMP) are mixed evenly according to the mass ratio of 80:10:10 to prepare the positive electrode slurry, wherein, more The diameter of the walled carbon nanotubes (i.e. the outer diameter of the multi-walled carbon nanotubes) is 20nm, and the length is 10 μm; then the positive electrode slurry is evenly coated on the positive electrode current collector aluminum foil, and the positive electrode diaphragm is obtained after drying, and then cooled Pressing and slitting to obtain the positive electrode sheet.

[0040] (2) Preparation of negative electrode sheet

[0041] Negative electrode active material, binder, conductive agent are mixed with solvent according to the mass ratio of 90:5:5 and evenly prepared into negative electrode slurry (w...

Embodiment 2

[0049] The preparation process of the sodium ion battery is the same as in Example 1, the difference is that

[0050] (1) Preparation of positive electrode sheet

[0051] Na 2 MnFe(CN) 6 The mass ratio of , multi-walled carbon nanotubes and PVDF is 85:5:10.

Embodiment 3

[0053] The preparation process of the sodium ion battery is the same as in Example 1, the difference is that

[0054] (1) Preparation of positive electrode sheet

[0055] Na 2 MnFe(CN) 6 The mass ratio of , multi-walled carbon nanotubes and PVDF is 70:20:10.

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Abstract

The invention provides a positive plate and an electrochemical battery. The positive plate includes a positive electrode current collector and a positive electrode film which is arranged on the positive electrode current collector and includes a positive electrode active material, a conductive agent and a binder, the positive electrode active material includes a Prussian-blue material, the molecular formula of the Prussian-blue material is AxMz[M'(CN)6]y, wherein A is one or more ions selected from the group consisting of an alkali metal ion and an alkaline earth metal ion, M is a transition metal, and M' is a transition metal, x is larger than 0 and smaller than or equal to 2, y is larger than 0 and smaller than or equal to 1, z is larger than 0 and smaller than or equal to 1, the conductive agent includes a one-dimensional carbon nanomaterial, and the diameter of the one-dimensional carbon nanomaterial is 5nm to 100nm. The one-dimensional carbon nanomaterial of the invention can formgood conductive networks on the surfaces of Prussian-blue material particles and the interior of secondary particles so as to reduce the electric resistance of the positive plate such that the positive plate has good electrical conductivity, and at the same time, the electrochemical battery has a high initial capacity and good cycle performance.

Description

technical field [0001] The present application relates to the field of batteries, in particular to a positive electrode sheet and an electrochemical battery. Background technique [0002] With the development of the battery industry, lithium-ion batteries are increasingly used as small energy storage systems in many fields such as mobile phones, computers, and electric vehicles. However, for large-scale energy storage systems, lithium-ion batteries still face many problems. , and the cost problem has become one of the important reasons restricting its development. Compared with lithium-ion batteries, sodium-ion batteries have become the most potential battery system for large-scale energy storage due to their advantages such as abundant raw material resources and low cost. However, Na-ion batteries exhibit poorer kinetic performance than Li-ion batteries under the same conditions due to the larger ionic radius of Na ions than Li ions. At the same time, the conductivity of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/583H01M4/62H01M4/60H01M10/0525
CPCY02E60/10
Inventor 王莹郭永胜梁成都苏硕剑刘倩
Owner CONTEMPORARY AMPEREX TECH CO
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