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 High performance, fast charging and discharging, high temperature performance

Active Publication Date: 2013-04-03
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...

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

[0035] According to the second aspect of the present invention, the preparation method for preparing the lithium-ion battery of the 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; making the positive electrode slurry Coated on both sides of the aluminum foil of the current collector, after drying, rolling, and slicing, the positive electrode sheet was obtained; the active material, conductive agent and binder of the negative electrode were added to the stirring tank, vacuumed and stirred, and the solvent was added to continue stirring. Obtain the 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 and s...

Embodiment 1

[0044] Preparation of High Pressure Fluorocarbonate Electrolyte: Weighing LiPF 6 Soluble in fluoroethylene carbonate (FEC) and ethyl methyl carbonate (EMC) (FEC / EMC volume ratio is 1:1). Prepare 1Mol / L LiPF 6 solution, adding 0.5% by mass percentage 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.

[0045] 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% of SP (super conductive carbon black), 1% of graphite conductive agent KS-6 and 3% of PVDF (polyvinylidene fluoride) 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;

[0046] Negative electrode sheet preparation: ...

Embodiment 2

[0050] 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.

[0051] 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 solvent which includes a fluoro carbonic ester and additives. The additives include fluoro methyl ethylene sulfate or derivatives thereof, or fluoro methyl ethylene sulfate or derivatives thereof and fluoro methyl sulfolane or derivatives thereof, or ethylene sulfate or derivatives thereof and fluoro methyl ethylene sulfite or derivatives thereof, or fluoro methyl sulfolane or derivatives thereof and fluoro methyl ethylene sulfite or derivatives thereof and fluoro methyl ethylene sulfate or derivatives. The additives comprises the following formulas: the fluoro methyl sulfolane derivatives are shown in the formula (1), wherein x=1-5, y+z=2x+1, x, y, z are positive integers; the fluoro methyl ethylene sulfite derivatives are shown in the formula (2), wherein r=1-5, s +t =2r+1, r, s and t are positive integers; and the fluoro methyl ethylene sulfate derivatives are shown in the formula (3), wherein u=1-5, v+w=2u+1, and u, v, and w are positive integers.

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