Electric core used for secondary lithium battery and preparation

A secondary lithium battery and cell technology, applied in secondary batteries, battery electrodes, electrode carriers/current collectors, etc., can solve the problems of inability to meet industrial needs, inability to coat battery pole pieces, and low battery energy density, etc. Achieve the effect of low manufacturing cost, high cost and improved efficiency

Inactive Publication Date: 2009-04-01
董兴国
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to: overcome the above-mentioned existing secondary lithium battery pole piece is limited by the coating process, and the battery pole piece can not be coated thick layer, causing the defect of low energy density of the battery; and the previous production The battery electrode technology cannot make the battery pole pieces into various shapes, especially it is impossible to make special-shaped battery electrodes, so that the shape of the

Method used

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  • Electric core used for secondary lithium battery and preparation
  • Electric core used for secondary lithium battery and preparation
  • Electric core used for secondary lithium battery and preparation

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0059] Example 1

[0060] reference figure 1 , To make a battery for a secondary lithium battery, including: a positive electrode, a negative electrode and a separator; the positive / negative electrode is on the positive / negative current collector, and the electrode mixture material is uniformly pressed on the positive / negative electrode through an extrusion process. On one surface of the negative electrode current collector, or evenly pressed on both surfaces of the positive / negative electrode current collector, a battery cell of a secondary lithium battery with an inner lining layer or both inner and outer lining layers is formed. The specific preparation steps of the battery as follows:

[0061] 1). First make a mold, which is a square box;

[0062] 2). Prepare the positive electrode mixture material used in the secondary lithium battery, calculate by weight percentage, and weigh according to the following formula:

[0063] a. The positive electrode active material lithium mang...

Example Embodiment

[0076] Example 2

[0077] reference image 3 with 4 , Make a negative case of a square battery, the negative current collector 3 is a 0.2 mm thick copper plate, the negative current collector 3 is made into a square case with a side length of 30 mm, the square case is hollow, and the side length is 18.6 mm Positive electrode cavity: A layer of negative electrode mixed material with a thickness of 6 mm is pressed on the inner wall of a square shell made of a negative electrode current collector through an extrusion forming process to form a negative electrode 10 with a “concave”-shaped shell lining (such as image 3 Shown).

[0078] reference Figure 5 , Make a positive electrode of a square battery, in which the positive electrode collector 1 uses a round or square copper rod, and a layer of positive electrode composite material is pressed around the positive electrode collector 1 to form a square with a side length of 18 mm. The composite material is wrapped with a 40-micron thic...

Example Embodiment

[0091] Example 3

[0092] reference Figure 8 This embodiment is to make a cell for a spherical battery. The negative current collector 1 is a copper shell with a thickness of 0.1 mm and two hemispherical shells with a radius of 8 mm are made, and the negative material is uniformly pressed into the hemispherical shell through an extrusion process In the inner wall, a hemispherical inner wall is uniformly extruded with a layer of 2 mm thick negative electrode mixed material, and the two hemispherical shells are butted together to form a positive electrode cavity with a middle radius of 5.9 mm (such as Figure 8 Shown).

[0093] The positive electrode mixed material and the positive electrode current collector. The positive electrode current collector 3 is an aluminum rod with a radius of 0.8 mm and pressed together to form a spherical positive electrode with a rod with a radius of 5.5 mm. The upper end of the aluminum rod of the positive electrode current collector 3 protrudes from...

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Abstract

The invention relates to an electric core of a secondary lithium battery and a preparation method thereof. The preparation method comprises the following steps: electrode mixed materials which are used in the secondary lithium battery are prepared, and the electrode mixed materials comprise the following materials by weight percentages: a. 30-97.9% of anode/cathode active materials; b. 1-40% of a solvent; c. 1-10% of a binding agent; and d. the rest of conductive additive; and the materials are mixed evenly; a produced current collector needed by the anode/cathode and the electrode combined materials of the anode/cathode are put in a mould, the electrode combined materials are evenly pressed on a surface of the anode/cathode current collector, or evenly pressed on two surfaces of the anode/cathode current collector, or evenly pressed on the periphery of the anode/cathode current collector by an extrusion process, and the electrode of the secondary lithium battery having an inner lining or simultaneously having an inner lining and an outer lining is obtained by heating and drying treatment. The method provides electrode shapes required by batteries with various shapes, and the thickness and the density of a pole piece can be made according to the design by a compaction process, therefore the energy density of the battery is improved.

Description

technical field [0001] The invention relates to an electrode and a processing technology of a secondary lithium battery, in particular to a battery cell and a preparation method for the secondary lithium battery. technical background [0002] The cells of the so-called secondary lithium battery are composed of a positive electrode, a separator and a negative electrode. At present, the positive / negative electrodes of secondary lithium batteries are sheet-like structures, which are all processed by coating technology. Due to the limitations of the coating process on the pole pieces, the positive or negative electrode materials cannot be coated too thickly, resulting in secondary lithium The energy density of the battery is not high, and the shape of the secondary lithium battery can only be round or square, and cannot be made into various shapes according to people's requirements; , A location is specially designed to assemble the battery, which brings a lot of inconvenience ...

Claims

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Application Information

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IPC IPC(8): H01M10/38H01M4/58H01M4/48H01M4/62H01M4/64H01M4/02
CPCY02E60/10Y02P70/50
Inventor 董兴国
Owner 董兴国
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