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Method for depositing silicon film at surface of lithium titanate cathode of lithium ion battery

A lithium-ion battery, surface deposition technology, applied in the direction of battery electrodes, circuits, electrical components, etc., to achieve the effect of high-rate charge and discharge performance improvement, and significant application possibilities

Inactive Publication Date: 2010-08-11
FUJIAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, carbon is easier to react with the electrolyte to form a complete and dense solid electrolyte interface film, resulting in irreversible capacity.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Dissolve 13.7 milliliters of tetra-n-butyl titanate in 20 milliliters of absolute ethanol solution to obtain solution A and keep stirring; dissolve 2.316 grams of lithium nitrate in 13.4 milliliters of absolute ethanol containing deionized water and acetic acid, where deionized 1.6 milliliters of water, 4.3 milliliters of acetic acid form B solution and continue to stir; Use a dropper to slowly drop B solution into the stirred A solution, the dropping speed is 40 drops per minute, and the stirring speed of A solution is 100 per minute. change. Keep stirring until a jelly-like gel forms. After aging for 5 days at room temperature, dry it in a drying oven at 80°C for 3 days to form a yellow powder and grind it for 30 minutes. The heating rate is 3°C / min, and the sintering time is 12 hours. After sintering, the temperature is lowered to room temperature with the furnace to obtain white lithium titanate powder.

[0028]After weighing 0.350 g of lithium titanate and 0.100 ...

Embodiment 2

[0032] Dissolve 13.7 milliliters of titanium tetrachloride in 20 milliliters of absolute ethanol solution to obtain solution A and keep stirring; dissolve 2.316 grams of lithium nitrate in 13.4 milliliters of absolute ethanol containing deionized water and acetic acid, wherein deionized water 1.6 Milliliter, 4.3 milliliters of acetic acid form B solution and keep stirring; B solution is dripped slowly in the stirring A solution with a dropper, and the dropping speed is 60 drops per minute, and the stirring speed of A solution is 150 revolutions per minute. Keep stirring until a jelly-like gel forms. After aging for 8 days at room temperature, dry it in a drying oven at 100°C for 1 day, form a yellow powder and grind it for 10 minutes, place it in a muffle furnace, and sinter in air at a sintering temperature of 800°C. The heating rate is 3°C / min, and the sintering time is 20 hours. After the sintering is completed, the temperature is lowered to room temperature with the furnac...

Embodiment 3

[0037] The preparation method of obtaining lithium titanate and lithium titanate negative electrode sheet by sol-gel technology is the same as that in Example 1.

[0038] After the preparation of the lithium titanate negative electrode sheet is completed, the lithium titanate negative electrode sheet is placed in a thermal evaporation deposition chamber as a deposition substrate, and amorphous silicon crystal is selected as the silicon source for forming the silicon thin film. The lithium titanate negative plate is placed 3.5 cm directly above the silicon source, and the side coated with lithium titanate faces the silicon source to be evaporated. Before depositing the silicon film, vacuum the deposition chamber to 5×10 -5 Below Pascal, the temperature of the deposition substrate is 160° C., and the deposition working pressure is 0.1 Pa.

[0039] Cut the lithium titanate negative electrode sheet with a silicon film deposited on the surface into a disc with a diameter of 1.25 c...

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Abstract

The invention belongs to the technical field of electrode material of lithium ion battery. The method is characterized in that the method comprises the following steps: dissolving titanium-containing precursor in absolute ethyl alcohol solution to obtain A solution; dissolving lithium-containing precursor in absolute ethyl alcohol to obtain B solution; and dropping the B solution in the A solution to form gel. The gel is dried, grinded and placed in a muffle furnace after aging for sintering to obtain Li4+xTi5+yO12; 70 parts of Li4+xTi5+yO12 and 17-23 parts of conductive black by weight are weighed and mixed and then grinded into a powder mixture; the mixture is poured in N-methyl pyrrolidone solution dissolved with 7-13 parts of bonder poly vinylidene fluoride by weight after being dried; the solution is coated on copper foil on standing at room temperature; and after drying, the lithium titanate cathode piece is obtained. The lithium titanate cathode piece as a deposition substrate is arranged rightly above the silicon source of a deposition cavity for deposition. The application of the method obviously improves high-powered charging and discharging performances of battery, and the improving effect is not influenced by specific technology for lithium titanate preparation; and the adaptability is very obvious.

Description

Technical field: [0001] The invention belongs to the technical field of lithium-ion battery electrode materials, and relates to a method for depositing a silicon film on the surface of a lithium titanate negative electrode to improve the high-rate charge-discharge performance of the battery, especially for improving the charge-discharge performance of lithium titanate. technical background [0002] In recent years, with the miniaturization and high performance of digital equipment and electronic instruments, high energy density and high voltage have been paid more and more attention. [0003] Spinel-type lithium titanate is a high-performance lithium-ion battery anode material with long life, high-current charging and discharging, safety, and environmental protection. It is an ideal substitute for carbon anode materials. The crystal can maintain a high degree of stability during the process, which can fundamentally eliminate the safety hazards of lithium-ion batteries, and g...

Claims

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Application Information

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IPC IPC(8): H01M4/139
CPCY02E60/122Y02E60/10
Inventor 林应斌黄志高赖恒陈水源李晓炜林莹
Owner FUJIAN NORMAL UNIV
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