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Great-capacity high-power lithium secondary battery and preparation method thereof

A lithium secondary battery, high-power technology, applied in the direction of secondary battery, electrolyte battery manufacturing, battery electrodes, etc., can solve the problems of backwardness in key technologies, lack of originality and independent intellectual property rights, and constraints on development, and achieve tolerance Strong resistance, increased pressure, and improved cycle life

Inactive Publication Date: 2011-06-22
CHANGZHOU HECO NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

my country's research on lithium-ion power and energy storage batteries is basically at the same pace as the world, but lacks originality and independent intellectual property rights, and the key technologies are relatively backward, which seriously restricts its development

Method used

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  • Great-capacity high-power lithium secondary battery and preparation method thereof
  • Great-capacity high-power lithium secondary battery and preparation method thereof

Examples

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Comparison scheme
Effect test

Embodiment 1

[0023] A lithium secondary battery with high capacity and high power is composed of a positive electrode, an electrolyte and a negative electrode, and the electrolyte contains bis(fluorosulfonyl)imide lithium LiN(SO 2 f) 2 , according to the 18650 standard cell design, such as figure 1 As shown, the specific production process is as follows:

[0024] The preparation method of the above-mentioned high-capacity and high-power lithium secondary battery comprises the following steps:

[0025] ① will contain 87% mass ratio of H 2 Ti 12 o 25 , 5% mass ratio of conductive carbon black and 8% mass ratio of polyvinylidene fluoride as solute, N-methylpyrrolidone as solvent to make negative electrode slurry, copper foil after 9 μm as current collector, the negative electrode slurry The material is coated on the front and back sides of the copper foil, and after drying, it is rolled and cut into pieces to make a negative electrode sheet with a compacted density of 2.1g / cm 3 ;

[00...

Embodiment 2

[0031] The high-capacity and high-power lithium secondary battery of this embodiment is composed of a positive electrode, an electrolyte solution, and a negative electrode through lamination or winding and packaging. The electrolyte solution contains lithium bis(fluorosulfonyl)imide LiN( SO 2 f) 2 , according to the design of 50Ah single battery, such as figure 2 As shown, the specific production process is as follows:

[0032] ①Will contain 90% MoO by mass ratio 2 , 5% mass ratio of carbon nanotubes, 1.5% mass ratio of sodium carboxymethyl cellulose and 3.5% mass ratio of chlorosulfonated polyethylene rubber as solute, and N-methylpyrrolidone as solvent to make negative electrode slurry , with 15μm copper foil as the current collector, the negative electrode slurry is coated on the positive and negative sides of the copper foil, after drying, it is rolled and cut into pieces to make a negative electrode sheet with a compacted density of 4.5g / cm 3 ;

[0033] ② Will conta...

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Abstract

The invention discloses a great-capacity high-power lithium secondary battery comprising a positive electrode, an electrolyte and a negative electrode. The great-capacity high-power lithium secondary battery is characterized in that the electrolyte contains bi-(mefluidide) lithium imide, the positive electrode is selected from a lithium-rich positive electrode material, and the negative electrode is selected from either of H2Ti12O25 or molybdenum dioxide. The invention also discloses a preparation method of the battery. The lithium secondary battery prepared by utilizing the method has high power and capacity and is suitable for lithium ion power and storage batteries in the fields of electric vehicles and new energy.

Description

technical field [0001] The invention belongs to the field of secondary lithium ion batteries, in particular to a high-capacity lithium secondary battery and a manufacturing method thereof. Background technique [0002] Due to the continuous depletion of fossil energy and the increasingly serious environmental pollution, the development of alternative energy and energy conservation and emission reduction have become the general trend. New energy sources such as solar energy and wind energy, as well as electric vehicles and hybrid vehicles have set off a climax worldwide. As the core power source of electric vehicles and the energy storage power source of solar energy and wind energy, the research and development of lithium-ion batteries is of great significance to the development of new energy sources, especially the research and development of key materials and technologies, especially the new generation of high-power, high-capacity The research and development of lithium-i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0525H01M10/0568H01M4/48H01M4/505H01M4/62H01M10/058
CPCY02E60/122Y02E60/12Y02T10/7011Y02E60/10Y02P70/50
Inventor 夏圣安李新宏杨万光
Owner CHANGZHOU HECO NEW ENERGY TECH CO LTD
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