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Lithium titanate composite material and preparation method thereof

A composite material, lithium titanate technology, applied in electrical components, battery electrodes, circuits, etc., can solve the problems of low electronic conductivity of lithium titanate, difficulty in processing lithium titanate powder, and high cost of preparation process, and achieves easy processing. The effect of sieve, low production cost and high electronic conductivity

Active Publication Date: 2015-10-14
SHANGHAI SHANSHAN TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem solved by the present invention is to overcome the problems in the prior art of lithium titanate powder processing difficulties, poor processability, low electronic conductivity of lithium titanate, and high cost of preparation process, and provide a lithium titanate composite material and its preparation method

Method used

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  • Lithium titanate composite material and preparation method thereof
  • Lithium titanate composite material and preparation method thereof
  • Lithium titanate composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] A preparation method for a lithium titanate composite material, comprising the steps of:

[0069] (1) According to the stoichiometric ratio of Li:Ti=0.816:1, Ti:Al=4.94:0.06 and C:Ti=0.088:1, 620g lithium carbonate, 1588g titanium dioxide, 90g aluminum nitrate nonahydrate, lemon monohydrate Mix 400g of acid and 1600mL of deionized water, and ball mill for 3 hours to form a uniform slurry with good fluidity;

[0070] (2) Dry the slurry under ventilated conditions at 100-130°C, and crush the dried block for 5 minutes to obtain a precursor; the precursor is a white powder;

[0071] (3) Under the protection of an inert atmosphere, the precursor powder was calcined at 800°C for 6 hours and pulverized for 2 minutes to obtain Particle A;

[0072](4) Under the protection of an inert atmosphere, calcinate the particle A at 750°C for 3 hours, and pulverize it for 1 minute.

[0073] The lithium titanate composite material prepared by this preparation method is designated as samp...

Embodiment 2

[0092] A preparation method of a lithium titanate composite material, which includes steps (1) to (4); the steps (2) to (4) are the same as in Example 1, and the step (1) is: according to Li:Ti=0.832:1 , Ti:Al=4.94:0.06 and C:Ti is the stoichiometric ratio of 0.088:1, lithium carbonate 632g, titanium dioxide 1588g, aluminum nitrate nonahydrate 90g, citric acid monohydrate 400g and deionized water 1600mL are mixed, ball milled for 3 hours, a uniform slurry with good fluidity is formed; after step (4), the lithium titanate composite material is obtained.

[0093] The lithium titanate composite material prepared by this preparation method is designated as sample 2. After testing, sample 2 is mainly Li 4 Ti 4.94 Al 0.06 o 12 / nano-carbon composite material, but its pH value is slightly higher than 11.7, and its 0.1C reversible capacity is 159.1mAh / g (the first efficiency is 93.3%), as shown in Table 4.

Embodiment 3

[0103] A preparation method of a lithium titanate composite material, which includes steps (1) to (4); the steps (2) to (4) are the same as in Example 1, and the step (1) is: according to Li:Ti=0.816:1 , Ti:Al=4.94:0.06 and C:Ti is the stoichiometric ratio of 0.018:1, lithium carbonate 620g, titanium dioxide 1588g, aluminum nitrate nonahydrate 90g, citric acid monohydrate 80g and deionized water 1600mL are mixed, ball milled for 3 hours, a uniform slurry with good fluidity is formed; after step (4), the lithium titanate composite material is obtained.

[0104] The lithium titanate composite material prepared by this preparation method is designated as sample 3. After testing, sample 3 is Li 4 Ti 4.94 Al 0.06 o 12 / Nano-carbon composite material, the XRD spectrum does not appear impurity phase, the electronic conductivity of the powder is 0.36S / m, and its 0.1C reversible capacity is 156.4mAh / g (the first efficiency is 96.2%), as shown in Table 5.

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Abstract

The invention discloses a lithium titanate composite material and a preparation method thereof, wherein the lithium titanate composite material includes a composite particle I, which is formed by coating the surface of Li4Ti4.94Al0.06O12 primary particles by nano carbon, and / or, a composite particle II, which is formed by a plurality of the composite particle I, wherein the structure of the composite particle II is a structure formed among the composite particles I. The nano carbon accounts for 0.2-1.8% of the total weight of the lithium titanate composite material. The particle size of the lithium titanate composite material is 0.1-50 [mu]m. The preparation method is low in raw material cost, is controllable in substance phase and is high in yield, and is suitable for large-scale industrial production. The lithium titanate composite material is stable in performance and can reach a 10 S / m magnitude order in electronic conductivity, is good in rate capability, is small in particle size, is easy to sieve, is good in processability and usability, and can be used in various energy-storage lithium ion batteries which require a long service life and various dynamic lithium ion batteries which require quick charging and discharging.

Description

technical field [0001] The invention relates to the field of lithium ion battery electrode materials, in particular to a lithium titanate composite material and a preparation method thereof. Background technique [0002] At present, the commercial lithium-ion battery negative electrode material is mainly graphite, but graphite has the following series of problems: (1) Low safety: it is easy to precipitate dendrite metal lithium, which will cause short circuit of the battery and cause fire or even explosion. (2) Poor cycle performance: Graphite has about 8% volume change during charging and discharging, the intercalation and deintercalation of lithium ions can easily lead to graphite pulverization, and its cycle life is difficult to exceed 1000 times. It is difficult to use it in large-scale energy storage power stations that require long life; (3) The ratio is not high: high-current charging and discharging will easily lead to graphite pulverization, which greatly reduces th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/485H01M4/62
CPCY02E60/10
Inventor 董国徽周亮刘华靖张殿浩乔永民
Owner SHANGHAI SHANSHAN TECH CO LTD
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