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Preparation method for positive plate containing Li2MoO3 coating layer

A positive electrode sheet and coating technology, which is applied in the field of preparation of lithium-ion supercapacitor positive electrode sheets, can solve problems such as difficulty in the manufacturing process and complex process, and achieve the effects of lowering the potential of the negative electrode, simplifying the preparation process, and reducing costs

Inactive Publication Date: 2017-09-22
肖丽芳
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These pre-doping methods involve relatively complicated processes and require special treatment of raw materials, which brings certain difficulties to the manufacturing process.

Method used

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  • Preparation method for positive plate containing Li2MoO3 coating layer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) Will Li 2 CO 3 and MoO 3 Mix according to the molar ratio of 1:1, mix evenly and put it in a muffle furnace for 3 hours at 500°C to react, and after the reaction, Li 2 MoO 4 .

[0023] (2) will get Li 2 MoO 4 Put it into a muffle furnace protected by a hydrogen-nitrogen mixture with a volume concentration of 5% hydrogen and react at 500 ° C for 5 hours. After the reaction, Li 2 MoO 3 Material.

[0024] (3) Add activated carbon material, conductive agent Ketjen black, and binder PVDF into NMP in a mass ratio of 90:5:5 to form a slurry, and then coat it on the positive electrode current collector 1 aluminum foil, and dry it Get the positive electrode.

[0025] (4) Will Li 2 MoO 3 Material, conductive agent Ketjen black, and binder PVDF are added to NMP according to the mass ratio of 80: 10: 10 and mixed into a slurry, and then coated on the positive electrode sheet 2 containing the active material, and obtained after drying. 2 MoO 3 Coating 3 positive pla...

Embodiment 2

[0029] (1) Will Li 2 CO 3 and MoO 3 Mix according to the molar ratio of 2:1, mix evenly and put it in a muffle furnace for 8 hours at 700°C to react for 8 hours. After the reaction, Li 2 MoO 4 .

[0030] (2) will get Li 2 MoO 4 Put it into a muffle furnace protected by a hydrogen-nitrogen mixed gas atmosphere with a volume concentration of 5% hydrogen at 900 ° C for 10 hours. After the reaction, Li 2 MoO 3 Material.

[0031] (3) Activated carbon material, conductive agent, and binder were added to NMP in a mass ratio of 90:5:5 and mixed to form a slurry, which was then coated on the positive electrode current collector 1 aluminum foil, and dried to obtain a positive electrode sheet.

[0032] (4) Will Li 2 MoO 3 Materials, conductive agent Ketjen black, and binder PVDF are added to NMP in a mass ratio of 90:5:5 and mixed to form a slurry, and then coated on the positive electrode sheet 2 containing the active material, and dried to obtain a slurry containing Li 2 MoO...

Embodiment 3

[0036] (1) Will Li 2 CO 3 and MoO 3 Mix according to the molar ratio of 1.3:1, mix evenly and put it into the muffle furnace for 7 hours at 600°C to react, and after the reaction, Li 2 MoO 4 .

[0037] (2) will get Li 2 MoO 4 Put it into a muffle furnace protected by a hydrogen-nitrogen mixture with a volume concentration of 5% hydrogen and react at 700 ° C for 8 hours. After the reaction, Li 2 MoO 3 Material.

[0038] (3) Add activated carbon material, conductive agent Ketjen black, and binder PVDF into NMP in a mass ratio of 90:5:5 to form a slurry, and then coat it on the positive electrode current collector 1 aluminum foil, and dry it Get the positive electrode.

[0039] (4) Will Li 2 MoO 3 Materials, conductive agent Ketjen black, and binder PVDF are added to NMP according to the mass ratio of 85:7:8 and mixed to form a slurry, and then coated on the positive electrode sheet 2 containing the active material, and dried to obtain a slurry containing Li 2 MoO 3 ...

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Abstract

The invention provides a preparation method for a positive plate containing a Li2MoO3 coating layer. The preparation method comprises the following steps: (1) Li2CO3 and MoO3 are mixed uniformly, the mixture is then put to a muffle furnace for a reaction, and after the reaction is over, a Li2MoO4 material is obtained; (2) the obtained Li2MoO4 material is put to the muffle furnace for a reaction under an atmosphere protection of hydrogen and nitrogen mixture, and after the reaction is over, a Li2MoO3 material is obtained; and (3) the Li2MoO3 material, a conductive agent and a binder are added to NMP to be mixed to a paste, the positive plate containing an active material is then coated by the paste, and after drying, the positive plate containing the Li2MoO3 coating layer is obtained. The preparation method for the positive plate containing the Li2MoO3 coating layer has the following beneficla effects: (1) the positive plate containing the Li2MoO3 coating layer is used as the positive electrode of a lithium ion supercapacitor, so that a lithium sheet or a complicated pre-lithium-intercalation process is not required by a negative electrode; and therefore, the preparation process is simplified, and the cost is lowered.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion supercapacitors, and relates to a method for preparing positive plates of lithium-ion supercapacitors. Background technique [0002] In recent years, lithium-ion secondary batteries have been greatly developed. Carbon materials such as graphite are generally used for the negative electrode of this battery, and lithium-containing metal oxides such as lithium cobalt oxide and lithium manganese oxide are used for the positive electrode. After the battery is assembled, the negative electrode supplies lithium ions to the positive electrode when charging, and the lithium ions from the positive electrode return to the negative electrode when discharging, so it is called a "rocking chair battery". Compared with lithium batteries using metallic lithium, this battery is characterized by high safety and high cycle life. [0003] However, the cycle life of lithium-ion secondary batteries is still restr...

Claims

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Application Information

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IPC IPC(8): H01G11/06H01G11/50H01G11/26H01G11/86
CPCY02E60/13H01G11/06H01G11/26H01G11/50H01G11/86
Inventor 肖丽芳钟玲珑
Owner 肖丽芳