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Positive electrode foam-type lithium-manganese battery and manufacturing method thereof

A lithium-manganese battery, foaming technology, applied to the electrodes of primary batteries, non-aqueous electrolyte batteries, etc., can solve the problems of low strength of positive electrode materials, easy to fall off, and unrealistic manufacturing methods of lithium-manganese batteries

Inactive Publication Date: 2013-01-16
平湖蓝威能源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage is that the aluminum mesh or stainless steel mesh is almost a planar structure, which can only collect current on one side of the positive electrode cake, and the positive electrode material on both sides of the mesh has low strength and is easy to fall off, so more binders and conductive agents are needed
[0007] If a high-current discharge, high-capacity lithium-manganese battery is manufactured, conventional lithium-manganese battery manufacturing methods cannot achieve

Method used

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  • Positive electrode foam-type lithium-manganese battery and manufacturing method thereof
  • Positive electrode foam-type lithium-manganese battery and manufacturing method thereof
  • Positive electrode foam-type lithium-manganese battery and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Filling directly into nickel foam:

[0020] 1) Formulation and manufacturing steps of positive electrode slurry:

[0021] Manganese dioxide: conductive agent: polyvinylidene fluoride: NMP=(55.0%-80.0%): (1.0%-5.0%): (0.2%-1.0%): (18.0%-40.0%).

[0022] The above formula is used to make the positive electrode slurry of the battery, the specific gravity of the slurry is 1.5-2.5g / ml, the viscosity is 600-8000mPa.S, and the slurry has certain good fluidity.

[0023] (1) Sizing: The foamed nickel is immersed in the slurry, and the slurry automatically enters the pores of the foamed nickel. By adjusting the thickness before the foamed nickel is immersed, that is, the pre-pressed thickness of the foamed nickel, that is, the foamed nickel The volume of the pores can be used to adjust the amount of slurry entering until the required weight. Or put the foamed nickel into the cavity, and then use the filling pump to inject slurry into the cavity to force the slurry into the foam...

Embodiment 2

[0031] 1) Formulation and manufacturing steps of positive electrode slurry:

[0032] Manganese dioxide: conductive agent: polyvinylidene fluoride: NMP=(55.0%-80.0%): (1.0%-5.0%): (0.2%-1.0%): (18.0%-40.0%).

[0033] Make the cathode slurry of battery with above formula:

[0034] (1) Baking: set the baking temperature to 110±5°C for 10 minutes to obtain semi-moist powder.

[0035] (2) Cake punching: Put the semi-wet powder and foamed nickel into the cake punching machine for punching and forming. The foamed nickel is on one side and treated by vacuum drying to obtain a foamed nickel positive electrode cake.

[0036] 2) Battery assembly:

[0037] Same as "Example 1". The foamed nickel surface of the cake is close to the large surface inside the positive electrode shell, which is beneficial to the electrical contact between the positive electrode cake and the battery shell.

[0038] Taking CR2032 as an example, the 15KΩ discharge capacity is above 250mAh, the large current 1....

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Abstract

The invention discloses a positive electrode foam-type lithium-manganese battery and a manufacturing method thereof, and belongs to the technology of the lithium-manganese battery. The manufacturing method of the battery comprises a preparation method of the positive electrode and a battery assembly. Specifically, the method comprises the steps of preparing the positive electrode into slurry, filling the slurry into foamed nickel; drying, impacting to make a positive electrode cake; or impacting positive electrode powder and the foamed nickel together in to the positive electrode cake; and then assembling the positive electrode cake into the battery. Since the current collector of the positive electrode is a three dimensional foamed nickel, the foam-type lithium-manganese battery has very good conductivity and can increase current-collecting effects in the positive electrode. The foamed nickel positive electrode cake is directly contacted with the positive electrode shell, thereby increasing electrical contact greatly, namely, enhancing an over-current effect. The foamed nickel is in a three dimensional net shape, has relatively high strength, and can increase the conductive connection of the positive electrode active materials under a condition of reducing the addition amount of a conductive agent and a binder, that is, the foamed nickel has significant improvement in increasing the conductivity of the positive electrode, gram specific capacity, a loading platform of the battery and capacity, and has excellent large current-discharge properties and special applicability.

Description

technical field [0001] The invention relates to a positive electrode foaming lithium-manganese battery and a manufacturing method thereof, belonging to the lithium-manganese battery technology. Background technique [0002] At present, the conventional manufacturing method of lithium manganese battery: [0003] 1. Positive electrode formula, positive electrode sheet manufacturing and battery assembly: [0004] Manganese dioxide: acetylene black: graphite: polytetrafluoroethylene emulsion: dehydrated alcohol: pure water=(47.0%~48.0%): (4.2%~4.4%): (0.8%~1.1%): (3.0%~ 4.0%): (5.0% to 5.5%): (37.0% to 40.0%). [0005] Use the above formula to prepare battery positive electrode slurry, after drying, remove the moisture in the slurry, and roll it on the rolling machine together with the aluminum expanded mesh or stainless steel mesh cut according to a certain size to form a positive electrode powder sheet with a specified thickness, and then The positive electrode powder sheet...

Claims

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Application Information

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IPC IPC(8): H01M6/14H01M4/06H01M4/08
CPCY02E60/12
Inventor 张红兵邓江南
Owner 平湖蓝威能源有限公司
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