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Lithium ion secondary battery and preparation method thereof

A secondary battery, lithium ion technology, applied in secondary batteries, electrolyte battery manufacturing, battery electrodes, etc., can solve the problem of low irreversible capacity of lithium batteries, and achieve the effect of improving safety, good safety and low cost

Active Publication Date: 2012-10-03
DONGFANG ELECTRIC CORP LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The invention aims to solve the defect of low initial irreversible capacity of lithium batteries containing hard carbon materials, and provide a lithium ion battery with good safety, high charge and discharge efficiency, excellent low temperature performance and suitable for fast charging and its preparation method

Method used

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  • Lithium ion secondary battery and preparation method thereof
  • Lithium ion secondary battery and preparation method thereof
  • Lithium ion secondary battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0073] A lithium-ion secondary battery, comprising a battery case, an aluminum-plastic film packaging bag, a pole core, a positive electrode lug, and a negative pole lug. The pole core is sequentially composed of a negative electrode layer, a separator layer, a positive electrode layer and a separator from the inside to the outside. layer, the negative electrode layer is a layered structure, including a negative electrode current collector, one or both sides of the negative electrode current collector is bonded with a negative electrode material layer composed of a hard carbon material layer and a lithium metal layer, and the negative electrode material The layers are two outer hard carbon material layers and a lithium metal layer between the two hard carbon material layers.

Embodiment 2

[0075] On the basis of embodiment 1, preferably:

[0076] The electric capacity of the lithium metal layer is equal to the total electric irreversible capacity of the two hard carbon material layers.

[0077] The hard carbon material layer is formed by mixing hard carbon material, conductive agent, binder and solvent.

[0078] The hard carbon material is starch-based pyrolytic carbon made by conventional techniques.

[0079] The separator layer is PP / PE / PP.

Embodiment 3

[0081] The preparation method of lithium ion secondary battery of the present invention:

[0082] A. Preparation of positive electrode slurry

[0083] Uniformly mixing the positive electrode material, conductive agent, binder and solvent to obtain positive electrode slurry;

[0084] B. Preparation of positive electrode layer

[0085] The positive electrode slurry prepared in step A is evenly coated on one or both sides of the positive electrode current collector to form a positive electrode material layer with a coating thickness of 100 microns, and the positive electrode material layer and the positive electrode current collector form a positive electrode layer;

[0086] C. Preparation of negative electrode slurry

[0087] Uniformly mixing hard carbon material, conductive agent, binder and solvent to obtain negative electrode slurry;

[0088] D. Coating negative electrode slurry

[0089] Uniformly coating the negative electrode slurry prepared in step C on one or both sid...

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Abstract

The invention discloses a lithium ion secondary battery and a preparation method thereof, and belongs to the field of lithium ion secondary batteries. The anode layer of the lithium ion secondary battery has a layered structure, and comprises an anode current collector. An anode material layer consisting of two outer hard carbon material layers and a lithium metal layer between the two hard carbon material layers is adhered to one or two surfaces of the anode current collector, wherein the lithium metal layer is plated on the hard carbon material layers by adopting an ion sputtering method. An irreversible capacity compensation layer of the lithium ion secondary battery is the lithium metal layer sandwiched between the hard carbon material layers, is uniformly distributed, and can avoid the risk that a diaphragm is pierced by lithium metal or lithium dendrites, wherein the lithium ion secondary battery has the advantages of high charging and discharging efficiency, high safety and the like.

Description

technical field [0001] The invention relates to a battery and a preparation method thereof. More specifically, the invention relates to a lithium ion secondary battery and a preparation method thereof, belonging to the field of lithium ion secondary batteries. Background technique [0002] With the wide application and rapid development of various portable electronic devices and electric vehicles, the demand and performance requirements for chemical power sources have increased dramatically. Compared with other chemical power sources, lithium-ion batteries are successfully and widely used in the field of terminal mobile electronic devices due to their advantages such as long life and high power characteristics. At present, lithium transition metal oxide / graphite systems are mostly used in commercial lithium batteries. With the rapid development of information technology, portable devices represented by mobile phones and notebook computers are constantly developing in the di...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0525H01M4/134H01M10/058
CPCY02E60/122Y02E60/10Y02P70/50
Inventor 谢皎王瑨胡蕴成李玉龙
Owner DONGFANG ELECTRIC CORP LTD
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