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Lithium titanate negative electrode material and preparation method therefor

A negative electrode material, lithium titanate technology, applied in the direction of titanate, alkali metal titanate, chemical instruments and methods, etc., can solve the problems of serious agglomeration, large polarization, large particle size, etc., and achieve good rate performance and cycle The effects of performance, small polarization internal resistance, and low-cost sources

Active Publication Date: 2016-08-24
SHENZHEN LIWEI LI ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the above-mentioned deficiencies in the prior art, the object of the present invention is to provide a lithium titanate negative electrode material and a preparation method thereof, aiming at solving the problems of high production cost, serious agglomeration, uneven particle size distribution, large particle size, and The problem of large internal resistance and large polarization

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Take 1 L of high-magnesium-lithium-ratio natural brine lithium with a lithium content of 1200 mg / L, and adjust the pH to 9.5 with 0.1 M ammonia water-ammonium chloride buffer solution. Weigh 100g of metatitanic acid powder and place it in a container with a lid, inject lithium with a high magnesium-lithium ratio natural brine prepared with a good pH value, close the lid, shake for 10 hours, filter, wash, and dry at 100°C for 6 hours to measure lithium The ion exchange rate with respect to metatitanic acid was 36.8 mg / g. According to the amount of lithium already contained, add 11.052g of lithium carbonate so that the molar ratio of lithium:titanium is 4:5. After ball milling and mixing, sinter in a muffle furnace at 700°C for 16 hours to obtain pure phase lithium titanate. Lithium titanate was mixed with organic carbon source sucrose, ball milled for 3 hours, mixed evenly, and then sintered at 300° C. for 2 hours in a nitrogen atmosphere to obtain a lithium titanate neg...

Embodiment 2

[0045] Take 1L of high-magnesium-lithium-ratio natural brine lithium with a lithium content of 694mg / L, and adjust the pH to 10.5 with 0.2M ammonia water-ammonium chloride buffer solution. Weigh 100g of metatitanic acid powder and place it in a container with a cover, inject lithium with a high magnesium-lithium ratio natural brine prepared with a good pH value, close the cover, shake for 12 hours, filter, wash, and dry at 120°C for 4 hours to measure lithium The ion exchange rate with respect to metatitanic acid was 30.9 mg / g. According to the amount of lithium already contained, add 9.20g of lithium hydroxide so that the molar ratio of lithium:titanium is 4:5. After ball milling and mixing, sinter in a muffle furnace at 750°C for 10h to obtain pure phase lithium titanate. Lithium titanate was mixed with organic carbon source glucose, ball milled for 2 hours, mixed evenly, and then sintered at 200° C. for 2 hours in an argon atmosphere to obtain an in-situ carbon-coated lithi...

Embodiment 3

[0048] Take 1L lithium brine with a high magnesium-lithium ratio of 1500mg / L lithium content and adjust the pH to 10.0 with 0.1M ammonia water-ammonium chloride buffer solution. Weigh 100g of metatitanic acid powder and place it in a container with a cover, inject lithium with a high magnesium-lithium ratio natural brine prepared with a good pH value, close the cover, shake for 4 hours, filter, wash, and dry at 150°C for 2 hours to measure lithium The ion exchange rate with respect to metatitanic acid was 41.8 mg / g. According to the amount of lithium already contained, add 15.66g of lithium nitrate so that the molar ratio of lithium:titanium is 4:5. After ball milling and mixing, it is sintered in a muffle furnace at 600°C for 24 hours to obtain a pure phase lithium titanate material. Lithium titanate was mixed with organic carbon source starch, ball milled for 4 hours, mixed evenly, and then sintered at 350° C. for 2 hours in a nitrogen atmosphere to obtain a lithium titanate...

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Abstract

The invention discloses a lithium titanate negative electrode material and a preparation method therefor. Metatitanic acid is adopted to absorb lithium from brine through ion exchange; then a lithium salt is added; the molar ratio of lithium to titanium is adjusted to be 4 to 5; and the lithium titanate negative electrode material is obtained by sintering through a solid-phase method. The lithium titanate negative electrode material and the preparation method therefor have the following technological advantages that: 1) the natural lithium-bearing brine is taken as the lithium source comprehensively, so that the usage amount of the refined lithium salt is lowered, and the material synthesis cost is greatly lowered; 2) due to the ion exchange method, the lithium source and the titanium source are uniformly distributed on the atomic level; the rearrangement of lattice matrix can be realized through short-range diffusion easily, so that the synthesis process is low in cost, and relatively low synthesis temperature and relatively short synthesis time can be realized; 3) due to the low synthesis temperature, the grain fineness distribution is uniform, and an more excellent electrochemical performance is presented after the carbon layer is coated in an in-situ manner; and 4) a higher advantage is realized compared with other schemes in the aspects of economic efficiency and environmental protection, and particularly, the practical meaning of extracting lithium from liquid lithium resource to synthesize the battery material is achieved.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a lithium titanate negative electrode material and a preparation method thereof. Background technique [0002] Carbon material is the negative electrode material for the commercialization of lithium-ion batteries, but the potential of carbon is very close to the standard potential of lithium. When the battery is overcharged, metal lithium is easy to precipitate on the surface of the carbon electrode to form dendrites, causing safety problems, and the carbon negative electrode cannot Meet the performance requirements of fast charging and discharging of lithium-ion batteries. [0003] Lithium titanate anode material has a stable structure, has a three-dimensional lithium ion channel, can meet the performance requirements of rapid charge and discharge of lithium ion batteries, and has excellent cycle performance. The potential relative to metal lithium is 1.55V, and the high lit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/485H01M10/0525C01G23/00
CPCC01G23/005H01M4/485H01M10/0525Y02E60/10
Inventor 刘立君宋翠环
Owner SHENZHEN LIWEI LI ENERGY TECH CO LTD
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