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Lithium ion battery

A lithium-ion battery, electrolyte technology, applied in the direction of batteries, secondary batteries, battery pack components, etc., can solve problems such as no solution yet, and achieve inhibition of lithium insertion phenomenon, inhibition of lithium insertion behavior, holes and cracks, etc. The effect of fewer defects

Active Publication Date: 2016-10-12
TIANNENG SAFT ENERGY JOINT CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

A solution that satisfies the above requirements has not yet been found

Method used

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Examples

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Embodiment 1

[0038] 1. Material preparation: After the AZ31B magnesium alloy is smelted, it is processed into a billet.

[0039]2. Profile processing: use a 1000-ton pipe extrusion machine to process it into a magnesium alloy pipe with a wall thickness of 0.4mm and an outer diameter of 18mm through multi-pass hot extrusion, and then process it into a magnesium alloy shell billet with a length of 70mm .

[0040] 3. Surface treatment: The magnesium alloy shell blank is pre-treated by mechanical grinding, chemical polishing, etc., and the double-pulse micro-arc oxidation technology is used to prepare ultra-micro-arc oxidation ceramic coatings. Electrolyte: potassium fluoride 15g / L, silicon Sodium phosphate 10g / L, phosphoric acid 5ml / L, potassium sodium orthophosphate 10g / L, potassium tartrate 5g / L, the rest is water, pH=3.5; temperature 25°C, micro-arc oxidation treatment 20min. Power supply mode: forward and reverse, positive final voltage is 500V, negative final voltage is 30V, current den...

Embodiment 2

[0046] 1. Material preparation: After the AZ91B magnesium alloy is smelted, it is processed into a billet.

[0047] 2. Profile processing: Using a 1000-ton pipe extruder, process it into a magnesium alloy pipe with a wall thickness of 0.4mm and an outer diameter of 26mm through multi-pass hot extrusion, and then process it into a magnesium alloy shell billet with a length of 70mm .

[0048] 3. Surface treatment: The magnesium alloy shell blank is subjected to pre-treatments such as mechanical grinding and chemical polishing, and the double-pulse micro-arc oxidation technology is used to prepare ultra-micro-arc oxidation ceramic coatings. Electrolyte: potassium fluoride 20g / L, silicon Sodium acid 15g / L, citric acid 5ml / L, sodium citrate 8g / L, sodium bicarbonate 10g / L, the rest is water, pH=9.0; temperature 25°C, micro-arc oxidation treatment 20min, power mode: forward and reverse , the positive terminal voltage is 750V, the negative terminal voltage is 40V, and the current den...

Embodiment 3

[0052] 1. Material preparation: After the WE43 magnesium alloy is smelted, it is processed into a billet.

[0053] 2. Profile processing: use a 1000-ton pipe extrusion machine to process it into a magnesium alloy pipe with a wall thickness of 0.4mm and an outer diameter of 18mm through multi-pass hot extrusion, and then process it into a magnesium alloy shell billet with a length of 70mm .

[0054] 3. Surface treatment: The magnesium alloy shell blank is pre-treated by mechanical grinding, chemical polishing, etc., and the ultra-micro-arc oxidation ceramic coating is prepared by double-pulse micro-arc oxidation technology. Electrolyte: potassium fluoride 25g / L, Sodium silicate 20g / L, hydrofluoric acid 5ml / L, sodium dihydrogen phosphate 8g / L, sodium tartrate 10g / L, the rest is water, pH=4.0; temperature 25°C, micro-arc oxidation treatment 25min, power mode: positive Reverse, positive final voltage is 500V, negative final voltage is 50V, current density 2.5A / dm 2 , frequency 7...

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Abstract

The invention discloses a lithium ion battery, and belongs to the field of material preparation. The lithium ion battery comprises a shell, a base material of the shell is magnesium alloy, and the surface of the shell is provided with a micro-arc oxidized ceramic layer; the thickness of the micro-arc oxidized ceramic layer is 5 micrometers to 40 micrometers, and the phase composition mainly comprises magnesium fluoride, trifluoro-magnesium potassium and a small amount of magnesium oxide, wherein the PBR of magnesium fluoride is larger than 1. The invention further discloses a preparation method of the battery shell. According to the lithium ion battery, magnesium alloy of which the surface is provided with the micro-arc oxidized ceramic layer is applied to the lithium-ion power battery shell, and therefore the mass of the prepared battery shell is decreased by about 60% relative to a stainless steel shell; the battery shell does not spontaneously burn if the battery shell burns within 5 minutes at 1,000 DEG C; through 1,000 times of circulating charge and discharge testing, no obvious lithium inserting phenomenon is generated in a Mg-Li electric pair.

Description

technical field [0001] The invention relates to the field of material preparation, in particular to a lithium ion battery. Background technique [0002] Lithium power batteries have the characteristics of high working voltage, long cycle life and high specific energy, and are widely used in the field of new energy vehicles. Although the energy density of lithium-ion batteries has been greatly improved, it is still difficult to meet consumers' needs for the mileage of electric vehicles. At present, the battery process design is relatively mature. It is difficult for lithium-ion power batteries with lithium iron phosphate and ternary materials as positive electrodes and carbon materials as negative electrodes to make a major breakthrough in energy density. Therefore, it is necessary to find new ways to increase the energy of lithium-ion power batteries. Density is imperative. [0003] Lithium power batteries generally use stainless steel as the battery case, and the stainles...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0525H01M2/02C25D11/30H01M50/116H01M50/124
CPCH01M10/0525C25D11/30H01M2220/20H01M50/116H01M50/124Y02E60/10
Inventor 李文杜克勤郭泉忠王勇苏海斌
Owner TIANNENG SAFT ENERGY JOINT CO
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