Pre-sodium-modified positive pole piece, application of pre-sodium-modified positive pole piece, sodium-ion battery and preparation method of sodium-ion battery

A technology of sodium ion battery and positive pole piece, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of increasing the difficulty of industrialization and production efficiency, increasing polarization, and difficulty in high-performance sodium ion battery systems, etc. Achieve the effect of reducing material structure damage and side reactions, reducing polarization, and improving electrochemical kinetics

Pending Publication Date: 2022-06-21
溧阳中科海钠科技有限责任公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At the same time, the lower electron transport and electrochemical kinetics of CRNa will increase the polarization, increase the reaction potential and time, increase the difficulty of industrialization and production efficiency, and make it more difficult to build a high-performance sodium-ion battery system

Method used

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  • Pre-sodium-modified positive pole piece, application of pre-sodium-modified positive pole piece, sodium-ion battery and preparation method of sodium-ion battery
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  • Pre-sodium-modified positive pole piece, application of pre-sodium-modified positive pole piece, sodium-ion battery and preparation method of sodium-ion battery

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preparation example Construction

[0048] In the present invention, the preparation method of the high-voltage sodium ion positive electrode slurry preferably includes the following steps: mixing the raw materials to obtain the high-voltage sodium ion positive electrode slurry;

[0049] The mixing is preferably vacuum stirring, and the rotational speed of the vacuum stirring is preferably 1500-3000rpm, more preferably 1800-2700rpm, more preferably 2100-2400rpm; the time is preferably 4-6h, more preferably 4.5-5.5h, and more preferably Preferably it is 4.8~5.2h; the vacuum degree is preferably -0.05~-0.08MPa, more preferably -0.06~-0.07MPa, more preferably -0.063~-0.066MPa.

[0050] In the present invention, the high-capacity sodium ion positive electrode slurry preferably contains the following raw materials: a high-capacity layered oxide positive electrode material, a binder, a conductive agent, carbon nanotubes, and a solvent.

[0051] In the present invention, the high-capacity layered oxide cathode material...

Embodiment 1

[0068] According to the mass ratio of 95:2.5:2:0.5, the high-capacity layered oxide cathode material O3-Na[Cu 1 / 9 Ni 2 / 9 Fe 1 / 3 Mn 1 / 3 ]O 2 , polyvinylidene fluoride, conductive agent-super-p, and carbon nanotubes were added to the stirring tank, N-methylpyrrolidone was added to control the solid content to be 60%, and stirred for 5h under the conditions of 2500rpm and -0.05MPa vacuum to obtain High-capacity sodium-ion cathode material.

[0069] According to the mass ratio of 96:2:1.5:0.5, the high-voltage layered oxide cathode material P2-Na 2 / 3 [Cu 1 / 3 Mn 2 / 3 ]O 2 , Na 2 C 2 O 4 , polypyrrole nanofibers and sodium carboxylate were added to the stirring tank, N-methylpyrrolidone was added to control the solid content to 70%, and stirred for 5h under the conditions of 2500rpm and -0.05MPa vacuum to obtain high-voltage sodium ion positive electrode slurry .

[0070] The first layer of high-capacity sodium ion positive electrode slurry and the second layer of high-...

Embodiment 2

[0083] According to the mass ratio of 94:3:1.5:0.8, the high-capacity layered oxide cathode material O3-Na[Cu 1 / 9 Ni 2 / 9 Fe 1 / 3 Mn 1 / 3 ]O 2 , polyvinylidene fluoride, conductive agent-super-p, and carbon nanotubes were added to the stirring tank, N-methylpyrrolidone was added to control the solid content to 62%, and stirred for 4h under the conditions of 1800rpm and -0.08MPa vacuum to obtain High-capacity sodium-ion cathode material.

[0084] According to the mass ratio of 97:1.9:1.9:0.4, the high-voltage layered oxide cathode material P2-Na 2 / 3 [Cu 1 / 3 Mn 2 / 3 ]O 2 , Na 2 C 2 O 4 , polypyrrole nanofibers and sodium dodecyl sulfate were added to the stirring tank, N-methylpyrrolidone was added to control the solid content to 73%, and stirred for 4.5h under the conditions of 2800rpm and -0.06MPa vacuum to obtain high-voltage sodium Ionic cathode slurry.

[0085] The first layer of high-capacity sodium ion positive electrode slurry and the second layer of high-vol...

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Abstract

The invention belongs to the technical field of battery materials. The invention provides a pre-sodium-modified positive pole piece. The pre-sodium-modified positive pole piece comprises high-voltage sodium ion positive pole slurry, high-capacity sodium ion positive pole slurry and a current collector, and the thickness of the high-voltage sodium ion positive electrode slurry is 10-15% of the sum of the thicknesses of the high-voltage sodium ion positive electrode slurry and the high-capacity sodium ion positive electrode slurry. Due to the effective use of the positive electrode sodium supplementing technology, the irreversible sodium loss of the hard carbon negative electrode is reduced, the dynamic performance of the sodium ion battery is improved, and the polarization is reduced; therefore, the high-performance sodium ion battery has the initial coulombic efficiency of more than 95%, the energy density of more than 150Wh/kg, the cycle life of more than 6000 weeks, the charge-discharge capacity at-40 DEG C and the continuous discharge capacity at 30C multiplying power, and the comprehensive electrochemical performance of the sodium ion battery is improved.

Description

technical field [0001] The invention relates to the technical field of battery materials, in particular to a pre-sodiumized positive electrode plate and its application, as well as a sodium ion battery and a preparation method thereof. Background technique [0002] The performance advantages of lithium-ion batteries make them widely used in the field of 3C, energy storage and electric vehicles. However, the problems of uneven distribution of lithium resources, shortage of resources, high price, and a large amount of dependence on imports are becoming increasingly prominent. Therefore, the development of Alternative or complementary new energy storage devices have become particularly important. Na-ion batteries have gained extensive attention and research due to their abundant resources, low cost, and environmental friendliness. In addition, sodium and lithium belong to the same main group, and the two have similar electrochemical properties. Na-ion batteries and lithium-ion ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/131H01M4/136H01M4/36H01M4/505H01M4/525H01M4/58H01M4/62H01M10/054H01M10/0587
CPCH01M4/131H01M4/136H01M4/366H01M4/5825H01M4/505H01M4/525H01M4/624H01M4/628H01M10/054H01M10/0587Y02P70/50
Inventor 杨行张庆戚兴国李树军唐堃
Owner 溧阳中科海钠科技有限责任公司
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