Positive pole piece of winding lithium-manganese battery

A technology of lithium manganese battery and positive electrode sheet is applied in the field of positive electrode sheet of wound lithium manganese battery, which can solve the difficulty of electrolyte penetration into the middle section of the positive electrode sheet, the limitation of high current pulse discharge performance of the battery, and the limitation of the continuous discharge time of the battery, etc. problems, to achieve the effect of improving ion conduction efficiency, increasing ion conduction speed, and increasing the number of high current pulses

Inactive Publication Date: 2014-10-29
NINGBO XINGRUI ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current positive electrode sheet has the following problems: 1. Due to the jelly-roll structure, it is difficult for the electrolyte inside the battery to penetrate into the middle section of the positive electrode sheet, resulting in a part of the positive electrode plate in the middle section not participating in the reaction, and the discharge efficiency of the battery is reduced.
2. The outer surface of the traditional positive electrode is smooth; the amount of electrolyte is limited, and the continuous discharge time of the battery is limited; the traditional positive electrode has poor liquid absorption effect, and the internal pressure of the battery is relatively high, resulting in more batteries. Leakage
3. The ion conduction area of ​​the traditional positive plate is relatively small, which reduces the ion conduction speed, and the battery's high-current pulse discharge performance is limited

Method used

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  • Positive pole piece of winding lithium-manganese battery
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  • Positive pole piece of winding lithium-manganese battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1: figure 1 Shown in is the position of the positive electrode sheet L in the battery; a winding type lithium manganese battery positive electrode sheet, including a positive electrode current collector 1 and an active material layer 2 coated on both sides of the positive electrode current collector 1, and the active material layer 2 The upper surface is provided with mesh grooves 3 communicating with each other.

[0023] The depth of the mesh groove 3 accounts for 1 / 2 of the thickness of the active material layer 2.

[0024] The positive electrode current collector 1 is a metal mesh, and the active material layer 2 is a manganese dioxide layer.

[0025] The thickness of the metal mesh 1 is 100 μm, and the thickness of the manganese dioxide layer 2 is 50 μm.

[0026] The mesh groove 3 is composed of a plurality of first grooves 31 parallel to each other and the same interval, and a plurality of second grooves 32 parallel to each other and the same interval. The first ...

Embodiment 2

[0029] Embodiment 2: A wound type lithium manganese battery positive sheet, comprising a positive current collector 1 and an active material layer 2 coated on both sides of the positive current collector 1. The upper surface of the active material layer 2 is provided with interconnected meshes Slot 3.

[0030] The depth of the mesh groove 3 accounts for 3 / 4 of the thickness of the active material layer 2.

[0031] The positive electrode current collector 1 is a metal mesh, and the active material layer 2 is a manganese dioxide layer.

[0032] The thickness of the metal mesh 1 is 300 μm, and the thickness of the manganese dioxide layer 2 is 300 μm.

[0033] The mesh groove 3 is composed of a plurality of first grooves 31 parallel to each other and the same interval, and a plurality of second grooves 32 parallel to each other and the same interval. The first groove 31 and the second groove 32 intersect and communicate with each other.

[0034] The structure of the first groove 31 is the...

Embodiment 3

[0036] Embodiment 3: A wound type lithium manganese battery positive sheet, comprising a positive current collector 1 and an active material layer 2 coated on both sides of the positive current collector 1. The upper surface of the active material layer 2 is provided with interconnected meshes Slot 3.

[0037] The depth of the mesh groove 3 accounts for 2 / 3 of the thickness of the active material layer 2.

[0038] The positive electrode current collector 1 is a metal mesh, and the active material layer 2 is a manganese dioxide layer.

[0039] The thickness of the metal mesh 1 is 200 μm, and the thickness of the manganese dioxide layer 2 is 150 μm.

[0040] The mesh groove 3 is composed of a plurality of first grooves 31 parallel to each other and the same interval, and a plurality of second grooves 32 parallel to each other and the same interval. The first groove 31 and the second groove 32 intersect and communicate with each other.

[0041] The structure of the first groove 31 is the...

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Abstract

The invention discloses a positive pole piece of a winding lithium-manganese battery. The positive pole piece comprises a positive pole current collector and active matter layers coating surfaces of two sides of the positive pole current collector, wherein mutually-communicated net-shaped grooves are arranged on the upper surfaces of the active matter layers. The positive pole piece has the advantages that the mutually-communicated net-shaped grooves are arranged on the upper surfaces of the active matter layers, and a groove structure is arranged on the positive pole piece and is smoother than a conventional positive pole piece, thus the storage space of an electrolyte is increased; and the inventory of the electrolyte is increased. The grooves on the surface of the positive pole piece are mutually communicated, thus the electrolyte on the whole positive pole piece can be effectively mutually complemented, and the state of no electrolyte in a local place is prevented. A vacuumizing electrolyte injecting manner is adopted as a main manner in the current industry of winding lithium-manganese batteries, but the electrolyte has difficulty in permeating to a middle section of the positive pole piece at present to cause the result that a part of a positive plate at the middle section does not participate in reaction, the phenomenon is effectively improved through a manner of additionally arranging the grooves on the surface of the positive pole, the whole positive pole piece participates in the reaction, and thus the discharge efficiency of the battery is increased.

Description

Technical field [0001] The invention relates to the field of lithium battery positive sheets, in particular to a wound lithium manganese battery positive sheet. Background technique [0002] The wound lithium manganese battery is composed of a lithium negative electrode sheet, a positive electrode sheet and a microporous separator arranged between two electrodes. The inside of the battery is wound into a "film"-like structure as a whole, and the battery is filled with electrolyte. The electrolyte is injected into the battery by vacuum injection. The reaction principle of the battery: the full name is lithium-manganese dioxide (Lithium-manganese dioxide, Li-MnO2). In the primary battery, the metal lithium is used as the anode and manganese dioxide is used as the cathode. In the primary battery, the anode is the negative electrode, electrons flow from the negative electrode to the positive electrode, and the current flows from the positive electrode to the negative electrode. In t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13
CPCH01M4/131Y02E60/10
Inventor 林曹平郁宇骏胡远帅吴葆荪
Owner NINGBO XINGRUI ENERGY TECH
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