Lithium ion battery and preparation method thereof

A lithium-ion battery and cell technology, applied in the field of lithium-ion batteries and their preparation, can solve the problems of low energy density of lithium-ion batteries, difficulty in meeting high-rate discharge, high-voltage and high-energy requirements, etc., to prevent precipitation and improve Magnification rate and energy density, and the effect of improving safety performance

Active Publication Date: 2013-05-08
HUBEI JINQUAN NEW MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in order to improve the safety of lithium-ion batteries, manufacturers usually design the ratio of the reversible capacity of the positive electrode to the reversible capacity of the negative electrode to be less than 1, w

Method used

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

Examples

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preparation example Construction

[0069] The present invention also relates to the preparation method of above-mentioned lithium ion battery, comprises the following steps:

[0070] 1), prefabricated positive electrode sheet, separator and negative electrode sheet; when preparing the positive electrode sheet, the coating surface density of the positive electrode material layer on the positive electrode sheet is 25mg / cm 2 ~36mg / cm 2 ; When preparing the negative electrode sheet, the coating area density of the negative electrode material layer coated on the negative electrode sheet is less than or equal to 36mg / cm 2 ; and the ratio of the reversible capacity of the positive electrode to the reversible capacity of the negative electrode is set to 1.2:1~1.5:1;

[0071] 2) According to the order of positive electrode sheet, diaphragm, negative electrode sheet and diaphragm, the cell is stacked and wound, and then the insulating tape is wrapped on the outside of the cell, and the cell is put into the casing and in...

Embodiment 1

[0093] This embodiment provides a lithium-ion battery, including a casing, an electric core disposed in the casing, and an electrolyte solution. The electric core includes a positive electrode, a negative electrode, and a separator for isolating the positive and negative electrodes. A positive electrode material layer on the surface of the sheet, the negative electrode includes a negative electrode sheet and a negative electrode material layer coated on the surface of the negative electrode sheet, and the coating surface density of the positive electrode material layer is 36 mg / cm 2 , the coating surface density of the negative electrode material layer is 12 mg / cm 2 , and the ratio of the reversible capacity of the positive electrode to the reversible capacity of the negative electrode is 1.32:1.

[0094] In this embodiment, the positive electrode material layer contains 94% by mass of the positive electrode material, and the negative electrode material layer contains 92% by m...

Embodiment 2

[0118] This embodiment provides a lithium-ion battery, including a casing, an electric core disposed in the casing, and an electrolyte solution. The electric core includes a positive electrode, a negative electrode, and a separator for isolating the positive and negative electrodes. A positive electrode material layer on the surface of the sheet, the negative electrode includes a negative electrode sheet and a negative electrode material layer coated on the surface of the negative electrode sheet, and the double-sided coating surface density of the positive electrode material layer is 25mg / cm 2 , the coating surface density of the negative electrode material layer is 8 mg / cm 2 , and the ratio of the reversible capacity of the positive electrode to the reversible capacity of the negative electrode is 1.2:1.

[0119] In this embodiment, the positive electrode material layer contains 90% by mass of the positive electrode material, and the negative electrode material layer contain...

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Abstract

The invention relates to a lithium ion battery comprising a shell, an electric core arranged inside the shell and electrolyte, wherein the electric core comprises a positive electrode, a negative electrode, and a membrane for separating the positive electrode from the positive electrode; the positive electrode comprises a positive electrode piece and a positive electrode material layer coated on the surface of the positive electrode piece; the negative electrode comprises a negative electrode piece and a negative electrode material layer coated on the surface of the negative electrode piece; the density of the coating face of the positive electrode material layer is 25-36mg/cm<2>; the density of the coating face of the negative electrode material layer is less than or equal to 36mg/cm<2>; and a ratio of the reversible capacity of the positive electrode to the reversible capacity of the negative electrode is (1.2:1)-(1.5:1). The negative electrode comprises the negative electrode piece, a negative electrode inner coating coated on the surface of the negative electrode piece, and a negative electrode outer coating coated on the surface of the negative electrode inner coating. The lithium ion battery has high multiplying power, high working voltage, high energy density, and low self discharge rate. The invention simultaneously provides a preparation method of the lithium ion battery.

Description

technical field [0001] The invention belongs to the technical field of lithium batteries, and in particular relates to a lithium ion battery and a preparation method thereof. Background technique [0002] In the 1980s, American scholar J.B.Goodenough and others first discovered lithium cobalt oxide (LiCoO 2 ), lithium nickelate (LiNiO 2 ) and lithium manganate (LiMn 2 o 4 ) can be used as a material for deintercalating lithium ions. In the 1990s, Sony successfully applied lithium cobalt oxide to commercial small electronic products for the first time. Since then, lithium-ion batteries have been widely used in various electronic devices due to their high cycle performance, high reliability and low pollution. 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 put forward for the energy and rate performance of lithium batteries. High-energy and hi...

Claims

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Application Information

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IPC IPC(8): H01M10/0525H01M4/13H01M10/058
CPCY02E60/122Y02E60/10Y02P70/50
Inventor 吕正中刘范芬袁中直刘金成
Owner HUBEI JINQUAN NEW MATERIALS CO LTD
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