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Lithium battery and preparation method thereof

A lithium battery and lithium salt technology, applied in the manufacture of electrolyte batteries, batteries, secondary batteries, etc., can solve the problems of loss of electrochemical activity, battery volume expansion, volume increase, etc., and achieve rapid migration, high rapid migration, Improved stability and security

Active Publication Date: 2014-04-16
HUBEI JINQUAN NEW MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the volume of this type of negative electrode material will increase due to the intercalation of lithium ions during the charging and discharging process, and after delithiation, the volume cannot return to the original state, causing the battery volume to expand, causing the electrode to pulverize and lose electrochemical activity. Lead to capacity loss, and there are great security risks at the same time

Method used

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  • Lithium battery and preparation method thereof
  • Lithium battery and preparation method thereof
  • Lithium battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] An embodiment of the lithium battery of the present invention, the lithium battery described in this embodiment is prepared by the following method:

[0049] (1) Production of positive electrode sheet: lithium cobalt oxide (LiCoO 2 ) is the positive electrode active material, mixed with the binder PVDF and the conductive agent Super-P in NMP at a mass ratio of 95:2:3 and stirred evenly to make a positive electrode slurry, with a mass ratio of 33.0mg / cm 2 The density of the positive electrode slurry is double-coated on an aluminum foil with a thickness of 16 μm and a length of 168 mm. The lengths of the double-sided coating of the positive electrode slurry on the aluminum foil are 130 mm and 152 mm, respectively. 42mm, thickness of 0.107mm pole piece, and weld the positive pole lug to obtain the positive pole piece with the positive pole diaphragm attached to the surface;

[0050] (2) Fabrication of the negative electrode current collector substrate: Take 9 μm copper fo...

Embodiment 2

[0056] An embodiment of the lithium battery of the present invention, the lithium battery described in this embodiment is prepared by the following method:

[0057] (1) Production of the positive electrode sheet: nickel-cobalt lithium manganate (LiNi) with a gram capacity of 146mAh / g 0.4 co 0.2 mn 0.4 o 2 ) is the positive electrode active material, mixed with the binder PVDF and the conductive agent Super-P in NMP at a mass ratio of 94.5:2:3.5 to make a positive electrode slurry, with a mass ratio of 30.0mg / cm 2 The density of the positive electrode slurry is double-coated on an aluminum foil with a thickness of 16 μm and a length of 168 mm. The lengths of the double-sided coating of the positive electrode slurry on the aluminum foil are 130 mm and 152 mm, respectively. 42mm, thickness of 0.107mm pole piece, and weld the positive pole lug to obtain the positive pole piece with the positive pole diaphragm attached to the surface;

[0058] (2) Production of negative electro...

Embodiment 3

[0064] An embodiment of the lithium battery of the present invention, the lithium battery described in this embodiment is prepared by the following method:

[0065] (1) Production of positive electrode sheet: lithium manganate (LiMnO) with a gram capacity of 100mAh / g 2 ) is the positive electrode active material, mixed with the binder PVDF and the conductive agent Super-P in NMP at a mass ratio of 94.5:2:3.5 to make a positive electrode slurry, with a mass ratio of 27.0mg / cm 2 The density of the positive electrode slurry is double-coated on an aluminum foil with a thickness of 16 μm and a length of 168 mm. The lengths of the double-sided coating of the positive electrode slurry on the aluminum foil are 130 mm and 152 mm, respectively. 42mm, thickness of 0.102mm pole piece, and weld the positive pole lug to obtain the positive pole piece with the positive pole diaphragm attached to the surface;

[0066](2) Production of the negative electrode current collector base: Cut 16 μm ...

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Abstract

The invention discloses a lithium battery. The lithium battery comprises a positive plate, a negative current collecting substrate, an isolating membrane and an electrolyte, wherein the isolating membrane and the electrolyte are arranged between the positive plate and the negative current collecting substrate; the positive plate comprises a positive current collecting body, a positive diaphragm and a positive polar lug, the positive diaphragm is attached to the positive current collecting body and contains a positive active material, and the positive polar lug is welded on the positive current collecting body; the negative current collecting substrate is made of a metal foil or a metal mesh with a thickness of 6-25 mu m, is 6-60 mu m in thickness and has a plane or concave-convex structure; and the electrolyte contains a lithium salt and a solvent, the lithium salt is lithium hexafluorophosphate, and the concentration of the lithium salt in the electrolyte is 1.5-7mol / L. The lithium battery disclosed by the invention has the characteristics of high power, high energy and low self-discharge rate. Meanwhile, the invention also discloses a preparation method and applications of the lithium battery.

Description

technical field [0001] The invention belongs to the technical field of lithium batteries, in particular to a lithium battery with high power, high energy and low self-discharge rate and a preparation method thereof. Background technique [0002] In recent years, with the continuous development of science and technology, the functions of electronic equipment have been continuously upgraded, so higher requirements have been placed on the energy and rate performance of lithium batteries. High energy and lithium batteries have become the key research direction of the battery industry. [0003] Lithium batteries are divided into lithium primary batteries (primary batteries) and lithium ion batteries (secondary batteries). Relatively speaking, lithium primary batteries have a higher energy density, mainly because the theoretical gram capacity of lithium metal negative electrodes is larger than that of lithium ion batteries using carbon-based negative electrodes. The theoretical gr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0525H01M10/058H01M4/70H01M50/449H01M50/457H01M50/489
CPCY02E60/122H01M4/661H01M4/745H01M10/0525H01M10/0567H01M10/058H01M50/449H01M50/457H01M50/489H01M4/74H01M10/0568H01M4/131H01M4/505H01M4/525H01M2220/30H01M2300/0028Y02E60/10Y02P70/50
Inventor 吕正中刘范芬袁中直刘金成
Owner HUBEI JINQUAN NEW MATERIALS CO LTD
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