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Slurry for negative electrode pole piece and preparation method thereof, negative electrode piece, and lithium ion battery

A technology of negative pole piece and slurry, which is used in secondary batteries, battery electrodes, non-aqueous electrolyte batteries, etc., can solve the problems of poor kinetic performance, low output power, and slow lithium deintercalation.

Pending Publication Date: 2019-10-08
桑顿新能源科技(长沙)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the graphite system used for negative electrode materials has poor kinetic performance, slow lithium deintercalation speed, and low output power, which cannot meet the high power output of battery products. The reason is mostly the coating on the negative electrode sheet. The electrical properties of the coating are caused by

Method used

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  • Slurry for negative electrode pole piece and preparation method thereof, negative electrode piece, and lithium ion battery
  • Slurry for negative electrode pole piece and preparation method thereof, negative electrode piece, and lithium ion battery
  • Slurry for negative electrode pole piece and preparation method thereof, negative electrode piece, and lithium ion battery

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preparation example Construction

[0034] A method for preparing a slurry for negative pole pieces, the method comprising:

[0035] The titanium hydroxide-coated graphite, the conductive agent, the thickener and the binder are added into the water, the stirring speed is 2500-4000r / min, and the stirring is carried out for 200-280min to obtain the slurry.

[0036] A negative pole piece, including copper foil and the above-mentioned slurry, the above-mentioned slurry is coated on the copper foil, and dried to obtain a negative pole piece; then the negative pole piece can also be rolled and die-cut to obtain an assembleable The negative pole piece; generally, the thickness of the selected copper foil is 8-12μm.

[0037] A lithium-ion battery, comprising a ternary positive electrode sheet, a diaphragm, an electrolyte and the above-mentioned negative electrode sheet, and the excess of the negative electrode is 1.15-1.2. Among them, the ternary positive electrode sheet is a commonly used nickel-cobalt-manganese oxide...

specific Embodiment 1

[0039] A kind of slurry for negative pole piece, slurry comprises according to mass fraction:

[0040] Paste 46%

[0041] water 54%;

[0042] Described slurry comprises by mass fraction:

[0043]

[0044] Among them, the preparation method of titanium hydroxide-coated graphite is: adding graphite and ethanol solution into water, heating to 400°C, stirring ultrasonically for 3 hours to prepare a suspension with a mass concentration of 40%; adding a mass concentration of 10% sodium hydroxide solution, then dropwise add 10% titanium sulfate solution, ultrasonically disperse and control the pH value to 9, and heat-treat for 3 hours at 800°C to obtain coated graphite; use the reacted coated graphite Repeated washing with pure water until the filtrate is neutral, and then microwave drying to obtain titanium hydroxide coated graphite. Among them, the D50 of graphite is 8μm, and the specific surface area is 1.6m 2 / g, the tap density is 1g / cm 3 ; The coating amount of titanium...

specific Embodiment 2

[0050] A kind of slurry for negative pole piece, slurry comprises according to mass fraction:

[0051] Paste 52%

[0052] water 48%;

[0053] Described slurry comprises by mass fraction:

[0054]

[0055] Among them, the preparation method of titanium hydroxide coated graphite is: adding graphite and ethanol solution into water, heating to 420°C, stirring ultrasonically for 3 hours to prepare a suspension with a mass concentration of 25%; adding a mass concentration of 10% sodium hydroxide solution, then dropwise add 6%-8% titanium nitrate solution, carry out ultrasonic dispersion and control the pH value to 9, heat treatment at 620°C for 4 hours to obtain coated graphite; the reacted coated graphite The coated graphite was washed repeatedly with pure water until the filtrate was neutral, and then dried by microwave to obtain titanium hydroxide coated graphite. Among them, the D50 of graphite is 7μm, and the specific surface area is 1.4m 2 / g, the tap density is 0.88g / cm ...

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Abstract

The invention relates to the field of a lithium ion battery and discloses slurry for a negative electrode pole piece and a preparation method thereof, the negative electrode piece and the lithium ionbattery. The slurry includes 46-54% of slurry body and 46-54% of the water by the mass fraction, and the slurry body includes, by the mass fraction, 93.5-95.5% of titanium hydroxide coated graphite, 2-3% of conductive agent, 1-1.5% of thickener and 1.5-2% of binder. The slurry is advantaged in that the power output range of the lithium ion battery assembled with the negative pole piece is greatlyimproved, the wetting effect of the electrolyte on the graphite can be improved, lithium insertion kinetics is improved, charge and discharge polarization phenomena are reduced, moreover, based on semiconductor properties of titanium hydroxide itself, electron conduction is accelerated, a coating material has a nanoparticle size, the tunneling effect is achieved, lithium ion conduction is improved, low temperature power output of a core is optimized, in particular, the rapid discharge capability of the lithium ion battery under the high current is greatly improved.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a slurry for negative pole pieces and a preparation method thereof, a negative pole piece, a lithium ion battery and a preparation method thereof. Background technique [0002] Lithium-ion batteries with high output voltage, high energy density, small self-discharge, no memory effect, good cycle performance, wide operating temperature range, and environmental friendliness have been widely used in portable electronic products and consumer electronic products , and with the development of electric vehicles in recent years, its technology has developed rapidly. [0003] Lithium-ion batteries are mainly composed of positive electrodes, negative electrodes, separators and electrolyte materials. Among them, the positive and negative electrode materials play a crucial role in the performance of the battery. At present, due to the fact that the performance of the main mat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/587H01M4/62H01M4/133H01M10/0525H01M10/058B82Y30/00
CPCH01M4/366H01M4/587H01M4/62H01M4/133H01M10/0525H01M10/058B82Y30/00Y02E60/10Y02P70/50
Inventor 王星星李东剑王佳希杨望秦蒙李小兵
Owner 桑顿新能源科技(长沙)有限公司
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