Lithium-ion battery with high energy density and preparation method thereof

A lithium-ion battery, high energy density technology, applied in the direction of battery electrodes, secondary batteries, circuits, etc., can solve the problem of not being able to meet the requirements of light weight, and achieve the effect of increasing energy density, simplifying the process, and ensuring cycle life and stability

Pending Publication Date: 2018-08-28
上海力信能源科技有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With the advancement of the times and the development of science and technology, the energy density of lithium-ion batteries continues to increase, but it still cannot meet the market demand for light weight and long battery life.

Method used

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  • Lithium-ion battery with high energy density and preparation method thereof
  • Lithium-ion battery with high energy density and preparation method thereof
  • Lithium-ion battery with high energy density and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A lithium-ion battery with high energy density, comprising a positive electrode sheet 1, a separator 2, a negative electrode sheet 3, a casing 4, an electrolyte, an aluminum tab 5, an aluminum tab glue 6, a nickel tab 7, and a nickel tab glue 8 . The positive electrode sheet 1 includes a positive electrode current collector and a positive electrode active layer coated on the surface of the positive electrode current collector. The positive electrode current collector is an aluminum foil current collector. The positive electrode active layer includes a positive electrode active material, a conductive agent, and a binder. The positive electrode active material is lithium cobaltate. . The negative electrode sheet 3 is a current collector of copper foil after electrolysis and calendering. The electrolyte includes lithium salt, solvent, and additives. The concentration of lithium salt in the electrolyte is 1.5mol / L. LiFSI and LiBOB are used as the lithium salt. LiFSI:LiBOB=...

Embodiment 2

[0038] The difference from Example 1 is that the lithium salt in Example 1 is changed to a two-component combination of LiFSI and LiODFB, LiFSI:LiODFB=8:2, the concentration of lithium salt remains unchanged, and the solvent and additives are not adjusted.

Embodiment 3

[0040] The difference from Example 1 is that the lithium salt in Example 1 is changed to a two-component combination of LiTFSI and LiBOB, LiTFSI:LiBOB=8:2, the concentration of lithium salt remains unchanged, and the solvent and additives are not adjusted.

[0041] image 3 The middle line 1 is the cycle performance of the lithium battery in Example 1, the line 2 is the cycle performance of the lithium battery in Example 2, and the line 3 is the cycle performance of the lithium battery in Example 3, Example 1, Example 2, Example 2 In 3, two different high-performance lithium salts are used respectively, and the effect is basically the same. The copper foil current collector is used as the negative electrode, and the lithium battery has a certain cycle performance. The mass of the negative electrode sheet of the lithium battery prepared by Example 1, Example 2, and Example 3 is reduced, the mass of the lithium battery is reduced, and the energy density is ≥ 350Wh / kg.

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Abstract

The invention discloses a lithium-ion battery with high energy density. The lithium-ion battery comprises a positive electrode piece, a diaphragm, a negative electrode piece, a shell body and electrolyte, wherein the diaphragm is arranged between the positive electrode piece and the negative electrode piece; the positive electrode piece, the diaphragm and the negative electrode piece are arrangedin the shell body after being wound; the shell body is fully filled with the electrolyte; the positive electrode piece comprises a positive electrode current collector and a positive electrode activelayer which is covered on the surface of the positive electrode current collector; the negative electrode piece adopts a copper foil current collector; the electrolyte is prepared from lithium salt, asolvent and an additive; the lithium salt comprises one of LiFSI and LiTFSI; the invention further discloses a preparation method of the lithium-ion battery. The lithium-ion battery disclosed by theinvention has the advantages that the copper foil current collector is used as the negative electrode piece, the high-performance lithium salt is matched and the mass of the negative electrode piece is alleviated, so that the mass of the lithium battery is reduced and the energy density is improved; the cycling life and stability of the lithium battery are ensured and a procedure for preparing thenegative electrode piece is simplified; raw materials are saved and the production cost is reduced.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a lithium ion battery with high energy density and a preparation method thereof. Background technique [0002] Lithium-ion batteries have the advantages of high specific capacity, small self-discharge, wide operating temperature range, high voltage platform, long cycle life, no memory effect, and environmental friendliness. They have been widely used in mobile phones, notebook computers, power tools and other fields. And gradually promote the application in the field of electric vehicles. With the progress of the times and the development of science and technology, the energy density of lithium-ion batteries continues to increase, but it still cannot meet the market demand for lightweight and long battery life. The endurance and gravimetric energy density of lithium-ion batteries have always been the direction pursued by lithium-ion batteries, especially in the field of fast...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0525H01M10/0587H01M4/134H01M10/0568H01M10/0567
CPCH01M4/134H01M10/0525H01M10/0567H01M10/0568H01M10/0587Y02E60/10Y02P70/50
Inventor 陈启多程君高远鹏柳听前朱清吴方胜
Owner 上海力信能源科技有限责任公司
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