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Lithium ion battery and preparation method thereof

A lithium-ion battery and lithium salt technology, applied in the manufacture of electrolyte batteries, battery electrodes, secondary batteries, etc., can solve the problems of battery energy density, safety, cost, etc., and achieve excellent anti-overcharge performance and thermal stability performance, high reliability, and long life

Active Publication Date: 2014-12-03
WUXI FUHONG TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, traditional lithium-ion battery cathode materials such as lithium cobaltate, lithium manganate, ternary materials, and lithium iron phosphate cannot meet the requirements of battery energy density, safety, and cost in the field of new energy to a large extent.

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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Effect test

preparation example Construction

[0042] According to the second aspect of the present invention, the preparation method for the lithium ion battery of the above-mentioned first aspect includes the steps of: dissolving the active material of the positive electrode, the conductive agent and the binder in the solvent and then stirring to form the positive electrode slurry; coating the positive electrode slurry Clothed on both sides of the aluminum foil of the current collector, after drying, rolling, and slicing, the positive electrode sheet is obtained; the active material, conductive agent and binder of the negative electrode are added to the stirring tank, vacuumized and stirred, and the solvent is added to continue stirring to obtain Negative electrode slurry: apply the negative electrode slurry on both sides of the aluminum foil of the current collector, and obtain the negative electrode sheet after drying, rolling, and slicing; wind or laminate the obtained positive electrode sheet, negative electrode sheet ...

Embodiment 1

[0051] Preparation of High Pressure Fluorocarbonate Electrolyte: Weighing LiPF 6 Soluble in fluoroethylene carbonate (FEC), ethyl methyl carbonate (EMC) (FEC / EMC volume ratio is 1:1). Prepare 1Mol / L LiPF 6 solution, adding 0.5% by mass percent of 2-fluoroethyl sulfolane C 6 h 11 FSO 2 (In general formula 1, x=2, y=4, z=1), stir evenly to obtain high pressure resistant fluorocarbonate electrolyte.

[0052] Positive sheet preparation: according to the mass ratio, 94% of the positive active material 0.5Li 2 MnO 3 0.5LiNi 0.5 mn 0.5 o 2 , 2% SP (super conductive carbon black), 1% graphite conductive agent KS-6 and 3% PVDF (polyvinylidene fluoride) are dissolved in NMP (N-methylpyrrolidone) and stirred to make positive electrode slurry; The positive electrode slurry is coated on both sides of the aluminum foil with a density of 340g / m 2 , through drying, rolling and slicing to obtain the positive electrode sheet;

[0053] Negative electrode sheet preparation: add 90% neg...

Embodiment 2

[0057] The difference from Example 1: the positive electrode active material is 0.3Li 2 MnO 3 0.7LiNi 0.5 mn 0.5 o 2 , the surface density after coating is 333g / m 2 , the formation process charges the battery to 3.0V.

[0058] After testing, the soft pack battery obtained in Example 2 has a capacity of 786mAh, an internal resistance of 54mΩ, an open circuit voltage of 3.2V, an energy density of 153Wh / L, and a capacity retention rate of 94% after 500 cycles. The battery did not catch fire or explode during the short-circuit safety test.

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Abstract

The invention relates to a lithium ion battery and a preparation method thereof. The lithium ion battery comprises a positive pole, a negative pole and electrolyte, wherein the electrolyte comprises lithium salt and a solvent; an active material of the positive pole is a rich lithium manganese base solid solution; an active material of the negative pole is lithium titanate; and the solvent comprises additives of one or more selected from fluoro carbonic ester, fluoro methyl sulfolane or derivatives of the fluoro methyl sulfolane, fluoro methyl sulphurous acid vinyl ester or derivatives of the luoro methyl sulphurous acid vinyl ester, and fluoro methyl sulfuric acid vinyl ester or derivatives of the fluoro methyl sulfuric acid vinyl ester. The preparation method comprises the following steps of: preparing a positive pole piece; preparing a negative pole piece; coiling or overlapping the obtained positive and negative pole pieces and a diaphragm so as to prepare a battery cell; putting into a shell or wrapping by a membrane; drying; injecting the electrolyte and sealing an opening; standing and forming; and subsequently aging, degassing, sealing, capacity dividing and detecting so as to obtain the lithium ion battery. The battery has the characteristics of high energy density, high security, low cost and long service life.

Description

technical field [0001] The invention relates to the field of batteries, in particular to a lithium ion battery and a preparation method thereof. Background technique [0002] Energy and the environment are two major issues facing mankind in the 21st century. In my country, with the acceleration of industrialization and urbanization, the demand for oil continues to increase, and the supply of oil in my country is in short supply, so the dependence on foreign countries continues to increase. As more oil and coal are mined and burned, atmospheric CO 2 As greenhouse gases continue to increase, China will face increasing pressure to reduce carbon emissions. The promotion of new energy vehicles and the development and utilization of new energy are strategic measures for the country to build an energy-saving society and reduce dependence on traditional energy sources. It is an inevitable choice for economic transformation under the pressure of carbon emission reduction. Power ba...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0525H01M4/485H01M4/505H01M10/0567H01M10/0569H01M10/058
CPCY02E60/122Y02E60/10Y02P70/50
Inventor 姜冬冬陈乐茵杨红平赵方辉徐永进
Owner WUXI FUHONG TECH
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