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Quick-charging lithium titanate battery and preparation method thereof

A fast-charging lithium titanate and battery technology, which is applied in the manufacture of electrolyte batteries, battery electrodes, secondary batteries, etc., can solve the problems of potential safety hazards and easy precipitation of metal lithium, and achieves simple operation, high dispersion efficiency, and solution. The effect of poor conductivity

Inactive Publication Date: 2018-04-24
SHANXI CHANGZHENG POWER TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, most commercial lithium-ion battery anode materials are graphite materials. The lithium intercalation potential of graphite is close to the lithium potential. When the battery is overcharged, lithium metal is easy to precipitate on the surface of the graphite anode, which poses a safety hazard.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Step 1: Preparation of positive and negative plates: Weigh 850g lithium cobaltate, 70g polyvinylidene fluoride, 40g superconducting carbon black, 40g conductive graphite into a stirring tank, stir the dry powder for 0.5h at a revolution of 15r / min, and add in three times 666g of N-methylpyrrolidone, disperse at high speed for 2h at a revolution of 20r / min and a rotation of 1500r / min to make a positive electrode slurry. The positive electrode slurry is evenly coated on the positive electrode current collector, baked at 80℃ for 24h and then rolled Obtain the positive pole piece; weigh 950g lithium titanate, 20g polyvinylidene fluoride, 10g graphene, 10g carbon nanotubes, 10g conductive graphite into a stirring tank, stir the dry powder for 1h at a revolution of 20r / min, add 800g N in three times -Methylpyrrolidone, disperse at a high speed of 15r / min and rotation at 1800r / min for 3h to make a negative electrode slurry. The negative electrode slurry is evenly coated on the n...

Embodiment 2

[0029] Step 1: Preparation of positive and negative plates: Weigh 900g of lithium cobaltate, 20g of polyvinylidene fluoride, 20g of superconducting carbon black, and 10g of conductive graphite into a stirring tank, stir the dry powder for 1h at a revolution of 20r / min, add 666g in three times N-Methylpyrrolidone, disperse at a high speed of 15r / min and rotation 1200r / min for 3h to make a positive electrode slurry. The positive electrode slurry is evenly coated on the positive electrode current collector, baked at 100℃ for 20h, and then rolled. Positive pole piece; Weigh 900g lithium titanate, 30g polyvinylidene fluoride, 20g graphene, 20g carbon nanotubes, 30g conductive graphite into a stirring tank, stir the dry powder for 1.5h at a revolution of 15r / min, add 800g N in three times -Methylpyrrolidone, disperse at a high speed of 20r / min and 2000r / min to make a negative electrode slurry at a high speed for 2 hours. The negative electrode slurry is evenly coated on the negative e...

Embodiment 3

[0033] Step 1: Preparation of positive and negative plates: Weigh 950g lithium cobaltate, 20g polyvinylidene fluoride, 10g superconducting carbon black, and 20g conductive graphite into a stirring tank, stir the dry powder for 1.5h at a revolution of 15r / min, and add in three times 666g of N-methylpyrrolidone, disperse at high speed for 4h at a revolution of 20r / min and a rotation of 1800r / min to make a positive electrode slurry. The positive electrode slurry is evenly coated on the positive electrode current collector, baked at 120℃ for 12h and then rolled Obtain the positive pole piece; weigh 850g lithium titanate, 50g polyvinylidene fluoride, 30g graphene, 30g carbon nanotubes, 40g conductive graphite into a stirring tank, stir the dry powder for 0.5h at a revolution of 20r / min, add 800gN in three times -Methylpyrrolidone, disperse at high speed for 2h under revolution 15r / min and rotation 1500r / min to make negative electrode slurry. The negative electrode slurry is evenly co...

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Abstract

The invention discloses a quick-charging lithium titanate battery and a preparation method thereof. The quick-charging lithium titanate battery consists of a positive electrode, a negative electrode,a diaphragm, electrolyte and an aluminum-plastic membrane. The preparation method comprises the following steps: step 1: preparing a positive pole piece and a negative pole piece; step 2: preparing asemi-finished product battery and step 3: preparing a finished product battery. According to the quick-charging lithium titanate battery and the preparation method thereof, trace titanium dioxide canbe added into the negative electrode of the battery, and a conducting agent formula is optimized, so that the defect that the lithium titanate is poor in conductivity can be solved. The battery of theinvention has good cycling performance and safety, and also has the quick charging capacity and low-temperature charging capacity; and the preparation method is simple in operation, the dispersing efficiency is high, and the quick-charging lithium titanate is suitable for production.

Description

Technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a fast-charging lithium titanate battery and a preparation method thereof. Background technique [0002] The fast charging technology of electric vehicles is one of the current research hotspots, which requires lithium-ion batteries with high safety, high power density and long life. At present, most of the anode materials for commercial lithium-ion batteries are graphite materials, and the lithium-intercalation potential of graphite is close to the lithium potential. When the battery is overcharged, metallic lithium is easy to precipitate on the surface of the graphite anode, which poses safety risks. The new lithium-ion battery negative electrode material, lithium titanate, has a potential of 1.55V to lithium. The higher potential avoids the formation of lithium dendrites and improves the safety performance of the battery. Lithium titanate has a small deformation during c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/48H01M10/0525H01M10/058
CPCH01M4/48H01M10/0525H01M10/058Y02E60/10Y02P70/50
Inventor 孙磊安富强
Owner SHANXI CHANGZHENG POWER TECH CO LTD
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