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Preparation method for lithium titanate material membrane electrode

A material film, lithium titanate technology, used in electrode manufacturing, battery electrodes, electrode heat treatment, etc., can solve the impact of battery compaction density and DC internal resistance, the adhesion between the dressing and the metal foil bottom, and the bonding performance. and other problems, to achieve the effect of saving conductive metal substrate, short synthesis process and convenient operation

Active Publication Date: 2014-06-04
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Many problems will appear in this process: the specific surface of the material has a great influence on the bonding performance of the material, and the large specific surface area will prevent the bonding performance of polyvinylidene fluoride; the poor bonding performance makes the dressing The bonding with the metal foil bottom is not tight, the light one will affect the compaction density and DC internal resistance of the battery, and the severe one will directly affect the powder drop of the electrode sheet during the rolling process; the smaller one will affect the compaction density and the larger one. DC internal resistance directly affects the performance of battery products, including electrochemical performance and safety performance

Method used

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  • Preparation method for lithium titanate material membrane electrode
  • Preparation method for lithium titanate material membrane electrode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Weigh lithium carbonate and titanium dioxide according to the molar ratio of lithium and titanium elements of 0.84:1, use analytical pure absolute ethanol as solvent, and the addition amount is 10% of the solid content of the control slurry; add triethyl phosphate as dispersant, the addition amount 2% of the total mass of the material; add polyvinyl butyral as a binder, and the amount added is 8% of the entire slurry volume; add polyethylene glycol as a plasticizer, and the amount added is 6% of the slurry volume ; Add SP as conductive agent, the amount added is 30% of the total material mass. Control the ball-to-material ratio of zirconium balls to 6:1, the speed to 450r / min, ball mill for 5 hours, adjust the slurry to 3000cp after ball milling, and evenly coat the smooth board surface with a small knife coater, and the coating thickness is 10μm , slightly dried in the air to obtain a precursor film with a certain toughness.

[0028] Use a slicer to take the slices, p...

Embodiment 2

[0031] Lithium hydroxide and titanium dioxide are weighed according to the molar ratio of lithium and titanium elements being 0.9:1, and analytically pure acetone is used as a solvent, and the addition amount is 60% of the solid content of the slurry to be controlled; ammonium salt dispersant 6300 is added as a dispersant, and the addition amount is 0.5% of the total mass of the material; add polyvinyl alcohol as a binder, and its addition is 1% of the total slurry volume; add dibutyl phthalate as a plasticizer, and its addition is 1% of the slurry volume; Add KS-6 as conductive agent, the amount added is 5% of the total material mass. Control the ball-to-material ratio of zirconium balls to 4:1. The rotation speed is 450r / min, the ball mill is 5h, the slurry is adjusted to 4000cp after the ball mill, and the small knife coater is evenly coated on the smooth board surface, the coating thickness is 10μm, and the precursor with certain toughness is obtained by drying in the air ...

Embodiment 3

[0034] Weigh lithium acetate and titanium dioxide according to the molar ratio of lithium and titanium elements of 0.84:1, use analytically pure acetone as a solvent, and add 20% of the solid content of the slurry; add ammonium salt dispersant OP-85 as a dispersant, the amount It is 1% of the total mass of the material; adding polyvinyl alcohol as a binder, and its addition is 4% of the entire slurry volume; adding diethylene glycol dibenzoate as a plasticizer, and the addition is 4% of the slurry volume %; Add KS-6 as conductive agent, the amount added is 20% of the total material mass. Control the ball-to-material ratio of zirconium balls to 3:1. The rotation speed is 450r / min, the ball mill is 5h, the slurry is adjusted to 1000cp after the ball mill, and the small knife coater is evenly coated on the smooth board surface, the coating thickness is 10μm, and the precursor with certain toughness is obtained by drying slightly in the air. body membrane.

[0035] Use a slicer ...

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Abstract

The invention discloses a preparation method for a lithium titanate material membrane electrode and belongs to the technical field of lithium ion batteries. The preparation method for the lithium titanate material membrane electrode comprises the following steps: taking a nano-grade titanium source and a nano-grade lithium source as base bodies; adding an organic solvent, a dispersant, an adhesive, a plasticizer and a conductive agent, and carrying out wet-method ball-milling; coating ball-milled slurry by using a scraping knife coating machine; slightly drying to obtain a precursor membrane; taking off a piece by using a piece taking machine; putting a plurality of layers of membrane pieces into a mould; pressurizing and drying in vacuum; and sintering under an inert atmosphere to obtain the lithium titanate material membrane electrode. According to the lithium titanate membrane electrode synthesized by the method, a crushing grading and electrode manufacturing process of a traditional solid-phase synthesized material is saved; meanwhile, a conductive metal foil base body of a pole piece is also saved; the sintered membrane piece can be directly used as an electrode and the cost is reduced. Sheeting and sintering are adopted so that the contact degree between precursor grains is increased, the sintering temperature is reduced and the sintering time is shortened. The synthesis process is simple so that the preparation method is suitable for industrial production.

Description

[0001] technical field [0002] The invention belongs to the technical field of battery material synthesis, in particular to a method for preparing a lithium titanate material membrane electrode. Background technique [0003] The rapid development of lithium-ion batteries depends on the development of new energy materials and the progress of comprehensive technologies. Among them, the exploration and research of new electrode materials, especially negative electrode materials, is particularly important. At present, most commercial negative electrode materials use graphite and other lithium-intercalated carbon materials as the negative electrode. Although compared with metal lithium, the cycle performance and safety performance have been greatly improved, but there is still passivation of the carbon surface during the first charge and discharge. The membrane causes the problem of large irreversible capacity loss. In addition, the potential of the carbon electrode is simila...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1397
CPCY02E60/122H01M4/0404H01M4/043H01M4/0471H01M4/1391H01M4/485Y02E60/10
Inventor 王永志杨续来谢佳
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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