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Preparation method of high-energy density power battery

A high energy density, power battery technology, applied in the direction of batteries, secondary batteries, battery electrodes, etc., can solve the problems of low voltage platform, low tap density, etc., to reduce battery internal resistance, increase energy density, and improve high temperature performance and safety performance

Pending Publication Date: 2021-04-02
JIANGSU SUNPOWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, in the Chinese (PHEV) market, lithium iron phosphate materials with olivine structure are mainly used as battery cathode materials, and lithium iron phosphate (LiFePO4) with olivine structure is mainly used. 4 ) Although the safety performance is relatively high, there are disadvantages such as a low discharge voltage platform (3.3V) and low tap density

Method used

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  • Preparation method of high-energy density power battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] The difference from Comparative Example 1 is:

[0041] Positive electrode: The active material is LiNi 0.6 co 0.2 mn 0.2 o 2 , double-sided density 268g / m 2 .

[0042] Diaphragm: The diaphragm adopts a double-sided coating diaphragm, the base film is PE, the thickness is 16 μm, the porosity is 50%, the coating is inorganic alumina, the inorganic substance is alumina with a particle size of 10~200nm, and one-sided coating The thickness is 4.5μm, and the surface density of one-sided coating is 5.6g / m 2 .

[0043]Electrolyte: LiFSi and LiBOB are used for the lithium salt of the electrolyte, LiFSi:LiBOB=8:2, the solvent is an organic solvent mixture of ethylene carbonate, ethyl methyl carbonate and ethyl propionate (EP), of which ethylene carbonate The volume ratio of ester, ethyl methyl carbonate and ethyl propionate (EP) is 20:40:40, and then add 3% vinylene carbonate, 1% propylene sulfite and 2% of Vinyl sulfite was uniformly mixed to obtain an electrolytic solut...

Embodiment 2

[0048] The difference from Comparative Example 1 is:

[0049] Positive electrode: The active material is LiNi 0.6 co 0.2 mn 0.2 o 2 , double-sided density 320g / m 2 .

[0050] Diaphragm: The diaphragm adopts a double-sided coating diaphragm, the base film is PE, the thickness is 16 μm, the porosity is 56%, the coating is a mixture of polyvinylidene fluoride and inorganic substances, and the mass proportion of polyvinylidene fluoride is 60%. The inorganic matter is alumina with primary particle size of 10~200nm, the thickness of one-side coating is 2.2μm, and the surface density of one-side coating is 2.8g / m 2 .

[0051] Electrolyte: The electrolyte uses 1.12mol / L lithium hexafluorophosphate and 0.08mol / L lithium bisoxalate borate dissolved in an organic solvent mixture of ethylene carbonate, ethyl methyl carbonate and ethyl butyrate (EB), among which ethylene carbonate , ethyl methyl carbonate and ethyl butyrate (EB) at a volume ratio of 20:40:40, and then sequentially a...

Embodiment 3

[0055] The difference from Comparative Example 1 is:

[0056] Positive electrode: The active material is LiNi 0.6 co 0.2 mn 0.2 o 2 , double-sided density 290g / m 2 .

[0057] Diaphragm: The diaphragm adopts double-sided coating diaphragm, the base film is PET, the thickness is 20μm, the porosity is 50%, the coating is inorganic alumina, the inorganic substance is alumina with a particle size of 15~180nm, and one side is coated The layer thickness is 3.2μm, and the surface density of one-sided coating is 4.3g / m 2 .

[0058] Electrolyte: The electrolyte uses 1.16mol / L lithium hexafluorophosphate and 0.02mol / L lithium bisoxalate borate dissolved in an organic solvent mixture of ethylene carbonate, ethyl methyl carbonate and methyl butyrate (MB), in which ethylene carbonate , ethyl methyl carbonate and methyl butyrate (MB) at a volume ratio of 20:35:45, and then sequentially add 5% vinylene carbonate, 1.5% propylene sulfite and 2% sulfite Vinyl sulfate was uniformly mixed ...

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Abstract

The invention provides a preparation method of a high-energy-density power battery. The method comprises the following steps: doping a high-potential lithium nickel manganese oxide material into lithium cobalt oxide to serve as a positive active substance, and taking graphite as a negative electrode. Through optimal configuration of a conductive agent, a diaphragm, an electrolyte and the like, thevoltage of a battery working platform is improved, and the energy density and the high-temperature cycle performance of the battery are improved. The electrolyte contains fluoroethylene carbonate which has effective film forming on the graphite negative electrode, and the internal resistance of a pole piece is reduced. The manufacturing process of the battery comprises the steps of active matterpremixing, pulping, coating, flaking, winding, channeling, liquid injection, sealing, formation and capacity grading. The battery has the characteristics of high energy density, good high-temperaturecycle performance and the like, so that the battery has a wide development prospect in the field of power batteries.

Description

technical field [0001] The invention relates to the technical field of lithium-ion power batteries, in particular to a preparation method of a high-energy-density lithium-ion power battery. Background technique [0002] Lithium-ion batteries have the advantages of wide operating temperature range, high specific capacity, high voltage platform, small self-discharge, no memory effect, long cycle life, and environmental friendliness. At present, electric vehicles are mainly divided into pure electric vehicles (EV), plug-in hybrid electric vehicles (PHEV) and hybrid electric vehicles (HEV). Lithium-ion batteries are mainly used as power batteries, and are also widely used in mobile phones, notebook computers, Electric tools and other fields. With the continuous improvement of the energy density of power batteries and the requirements for high-temperature cycle performance. Research and development of lithium-ion batteries with high energy density is imminent. [0003] At pres...

Claims

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Application Information

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IPC IPC(8): H01M10/0587H01M10/0525H01M50/443H01M50/446H01M50/457H01M4/525H01M10/0567H01M10/0568H01M10/0569
CPCH01M10/0587H01M10/0525H01M4/525H01M10/0567H01M10/0568H01M10/0569H01M2220/20H01M2300/0025H01M2300/0037Y02E60/10Y02P70/50
Inventor 闵秀娟杨清欣宋泽斌
Owner JIANGSU SUNPOWER