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High-temperature three-element material power battery and preparation method thereof

A technology of power battery and ternary material, applied in the field of high temperature ternary material power battery and its preparation, can solve the problems of flatulence, capacity retention rate can only reach 1500 weeks, etc., and achieve the effect of high safety

Inactive Publication Date: 2017-05-31
HEFEI HENGNENG NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problems of existing ternary lithium-ion batteries that are cycled at a high temperature of 60°C, which may cause flatulence, and the capacity retention rate can only reach 1,500 cycles, and provide a high-temperature ternary material that can reach 3,000 cycles at a high temperature of 60°C. Power battery and preparation method thereof

Method used

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  • High-temperature three-element material power battery and preparation method thereof
  • High-temperature three-element material power battery and preparation method thereof
  • High-temperature three-element material power battery and preparation method thereof

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Effect test

Embodiment 1

[0037] A high-temperature ternary power battery, the positive electrode is a nickel-cobalt-manganese 1:1:1 ternary positive electrode material, the negative electrode uses natural scaly graphite, and the electrolyte is 30% ethylene carbonate, 40% ethyl methyl carbonate and 30% % diethyl carbonate mixed solution, the additives are 2% vinylene carbonate, 2% 1,3-propenyl-carbonic lactone and 2% propylene sulfite; the diaphragm is a coated diaphragm, and the diaphragm The substrate is polypropylene with a thickness of 30 μm; the coating is ceramic; the thickness is 4 μm; the positive current collector: carbon-coated aluminum foil, the thickness of the aluminum foil is 16 μm, and the thickness of the carbon coating is 1 μm; the cover plate is equipped with a discharge valve and a safety valve; The coating thickness is 0.5 μm.

[0038] The preparation method comprises the following steps:

[0039] 1) Mix the ternary material into the NMP solvent, add a conductive agent, and dispers...

Embodiment 2

[0045]A high-temperature ternary power battery, the positive electrode is a nickel-cobalt-manganese 1:1:1 ternary positive electrode material, the negative electrode uses natural scaly graphite, and the electrolyte is 35% ethylene carbonate, 35% ethyl methyl carbonate and 30% % diethyl carbonate mixed solution, the additives are 2.5% vinylene carbonate, 2% 1,3-propenyl-carbonic lactone and 2% propylene sulfite; the diaphragm is a coated diaphragm, and the diaphragm The substrate is polypropylene with a thickness of 28 μm; the coating is ceramic; the thickness is 5 μm; the positive current collector: carbon-coated aluminum foil, the thickness of the aluminum foil is 14 μm, and the thickness of the carbon coating is 1.5 μm; the cover plate is equipped with a discharge valve and a safety valve; The thickness of the silica gel coating is 0.5 μm.

[0046] The preparation method comprises the following steps:

[0047] 1) Mix the ternary material into the NMP solvent, add a conducti...

Embodiment 3

[0053] A high-temperature ternary power battery, the positive electrode is a nickel-cobalt-manganese 1:1:1 ternary positive electrode material, the negative electrode uses natural scaly graphite, and the electrolyte is 30% ethylene carbonate, 35% ethyl methyl carbonate and 35% % diethyl carbonate mixed solution, the additives are 2.5% vinylene carbonate, 2% 1,3-propenyl-carbonic lactone and 2.5% propylene sulfite; the diaphragm is a coated diaphragm, and the diaphragm The substrate is polypropylene with a thickness of 32 μm; the coating is ceramic; the thickness is 3 μm; the positive current collector: carbon-coated aluminum foil, the thickness of the aluminum foil is 12 μm, and the thickness of the carbon coating is 0.5 μm; the cover plate is equipped with a discharge valve and a safety valve; The thickness of the silica gel coating is 0.3 μm.

[0054] The preparation method comprises the following steps:

[0055] 1) Mix the ternary material into the NMP solvent, add a condu...

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Abstract

The invention relates to the technical field of three-element material power batteries, and particularly provides a high-temperature three-element material power battery which comprises a positive pole, a diaphragm, a negative pole, an electrolyte, a cover plate and a shell, wherein the active substance of the positive pole is a three-element positive pole material of which the nickel:cobalt:manganese ratio is 1:1:1. The positive pole current collector is carbon-coated aluminum foil. The diaphragm is a coated diaphragm, the diaphragm matrix is polypropylene, and the coating is ceramic. The negative pole is natural flaky graphite powder. The electrolyte comprises an organic solvent and an additive; the organic solvent is a mixed solution composed of 30-35 wt% of ethylene carbonate, 35-40 wt% of methylethyl carbonate and 30-35 wt% of diethyl carbonate; and the additive is a mixed solution composed of vinylene carbonate which accounts for 2-2.5 wt% of the organic solvent, 1,3-propenyl carbonate which accounts for 2-2.5 wt% of the organic solvent and propenyl sulfite which accounts for 2-2.5 wt% of the organic solvent; and 0.3-0.5mu m silica gel is coated inside the shell. The test on the product under the condition of 3000 cycles or above at high temperature is passed. In the pin-prick test period, no naked fire is seen, the shell does not explode, and thus, the power battery has higher safety.

Description

technical field [0001] The invention belongs to the field of ternary material power batteries, and in particular relates to a high-temperature ternary material power battery and a preparation method thereof. Background technique [0002] Oil resources are becoming increasingly depleted. Before the next oil crisis comes, it is the only choice to vigorously develop pure electric vehicles. According to statistics from the Ministry of Industry and Information Technology, in 2015, the cumulative output of the pure electric bus market reached 88,000 units, a year-on-year increase of 584%, compared with a net increase of 75,000 units in 2014. , more than double that of the same period last year. As the market has higher and higher requirements for the cruising range of electric vehicles, the national subsidy policy is subsidized according to the energy density, which leads to the gradual withdrawal of lithium iron phosphate from the market, and the ternary lithium-ion power batter...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/525H01M4/583H01M2/16H01M10/0567H01M10/0569H01M4/66H01M2/02H01M2/04H01M2/12H01M10/613H01M10/625H01M10/653H01M10/0525H01M10/058
CPCH01M4/505H01M4/525H01M4/583H01M4/667H01M10/0525H01M10/0567H01M10/0569H01M10/058H01M2220/20H01M2300/0025H01M2300/004H01M10/613H01M10/625H01M10/653H01M50/116H01M50/147H01M50/394H01M50/411H01M50/431H01M50/449Y02E60/10Y02P70/50
Inventor 白思宇林彭桃君吴树森武玉哲丁蒙蒙周皖岳
Owner HEFEI HENGNENG NEW ENERGY TECH
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