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Carbon-clad spinel lithium titanate material, production method and application thereof

A lithium titanate and lithium titanate technology, which is applied to carbon-coated spinel lithium titanate materials and their production and application fields, can solve the problem that the material does not have a crystal form, and the rate characteristics cannot meet the requirements of high-power lithium-ion batteries, The impact of material cycle performance and other issues

Inactive Publication Date: 2014-12-31
SHANGHAI ELECTRICGROUP CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The synthesis process of this method is simple, only need to fully mix the lithium source and titanium source materials with the chemical formula ratio, and then calcinate the product in the range of 700-1000 ° C for 12-48 hours to obtain the product, but the material prepared by this method has a particle size Generally, it is more than ten microns, and does not have a uniform shape. Although it can be used as a negative electrode material for lithium-ion batteries, due to the influence of its particle size and shape, its rate characteristics cannot meet high-power lithium-ion batteries, especially for lithium-ion batteries. Requirements for power batteries; the second type is the hydrothermal synthesis method, which can produce smaller particle sizes (generally in the hundreds of nanometers), but due to the limitations of the synthesis method itself, the material does not have good crystallinity. type, the cycle performance of the material is affected
In summary, the existing synthetic methods are difficult to prepare nano-spinel lithium titanate Li with uniform scale or specific structure. 4 Ti 5 o 12

Method used

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  • Carbon-clad spinel lithium titanate material, production method and application thereof
  • Carbon-clad spinel lithium titanate material, production method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0074] Adopt the method in the claim to synthesize nanometer Li 4 Ti 5 o 12 / carbon composite. The specific steps are as follows: add lithium acetate dihydrate (CH 3 COOLi·2H 2 O, 29.48g, 0.289mol), inject 200mL of absolute ethanol, and stir rapidly at 20°C; dropwise add tetrabutyl titanate ((C 4 h 9 O) 4 Ti, 120mL, 0.3526mol) (Li:Ti=0.82, molar ratio), added dropwise within five minutes. Add 24mL deionized water and 20mL glacial acetic acid to 160mL absolute ethanol, and stir evenly with a glass rod. The solution was transferred to the dropping funnel, and injected into the flask under rapid stirring (20s injection was completed).

[0075] 20 DEG C of constant temperature stirring 3h, form transparent sol, obtain white gel after aging 24h. The aged gel was vacuum-dried at 80°C for 12 hours to obtain a white slightly light yellow powder, which became a fine white powder after ball milling for 1 hour to obtain a precursor. The obtained precursor powder was pre-sinter...

Embodiment 2

[0084] Adopt the method in the claim to synthesize nanometer Li 4 Zn 0.1 Ti 4.95 o 12 / carbon composite particles. Add lithium acetate dihydrate (CH 3 COOLi·2H 2 O, 29.48g, 0.289mol) and zinc acetate dihydrate ((CH 3 COO) 2 Zn·2H 2 O, 2.195g, 0.01moL), inject 200mL of absolute ethanol, and stir rapidly at 20°C; add tetrabutyl titanate ((C 4 h 9 O) 4 Ti, 118.8mL, 0.03491mol) (Li:Zn:Ti=4.1:0.1:4.95), added dropwise within five minutes. Add 24mL deionized water and 20mL glacial acetic acid to 160mL absolute ethanol, and stir evenly with a glass rod.

[0085] Remaining steps are with embodiment 1.

[0086] The obtained product has a particle size of 400-500 nm. Assemble the buckle according to the method described in Example 1 and perform an electrochemical test. The test results show that the material has a capacity of 160mAh / g when charged and discharged at 1 / 3C; 150mAh / g when charged and discharged at 1C; and 110mAh / g when charged and discharged at 20C. Under th...

Embodiment 3

[0088] Adopt the method in the claim to synthesize nanometer Li 4 Mg 0.05 Ti 4.975 o 12 / carbon composite nanoparticles. Add lithium acetate dihydrate (CH 3 COOLi·2H 2O, 29.48g, 0.289mol) and magnesium acetate tetrahydrate (Mg(CH 3 COO) 2 4H 2 O, 1.072g, 0.005moL), inject 200mL of absolute ethanol, and stir rapidly at 20°C; add tetrabutyl titanate ((C 4 h 9 O) 4 Ti, 119.4mL, 0.3508mol) (Li:Zn:Ti=4.1:0.05:4.975), added dropwise within five minutes. Add 24mL deionized water and 20mL glacial acetic acid to 160mL absolute ethanol, and stir evenly with a glass rod. Remaining steps are with embodiment 1. get nano Li 4 Mg 0.05 Ti 4.975 o 12 / carbon composite nanoparticles.

[0089] Remaining steps are with embodiment 1.

[0090] Assemble the buckle according to the method described in Example 1 and perform an electrochemical test. The test results show that the material has a capacity of 165mAh / g when charged at 1 / 3C; 155mAh / g when charged at 1C; and 115mAh / g whe...

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Abstract

The invention relates to a carbon-clad spinel lithium titanate Li4MxTiyO12 material used as a lithium ion battery cathode material, a production method and an application thereof. The cathode material is spinel type Li4MxTiyO12 or a mono or multiple other metallic element-doped compound Li4MxTiyO12. A synthetic method comprises the following steps: mixing an organic titanium solution and lithium salt liquid to prepare sol; aging the sol to obtain a lithium titanate gel predecessor; calcining the gel predecessor, and being conversed to the spinel lithium titanate material with nano size; or comprises the following steps: dispersing the prepared lithium titanate in a carbon source organic solution, removing the solution, and calcining to obtain the spinel lithium titanate / carbon composite material with nano size. Compared with lithium titanate Li4Ti5O12 prepared by a conventional method, the spinel lithium titanate material has better multiplying power characteristic, when the spinel lithium titanate material is used as a lithium ion battery cathode, the power performance of the cell can be obviously increased.

Description

technical field [0001] The present invention relates to a lithium-ion battery negative electrode material and a production method thereof, in particular to a production method of a carbon-coated spinel lithium titanate used for a lithium-ion battery negative electrode material, and the carbon-coated spinel lithium titanate produced by the method The spar lithium titanate, the present invention also relates to a lithium ion battery negative electrode containing the spinel lithium titanate, and a lithium ion battery. Background technique [0002] With the depletion of oil resources and the aggravation of environmental pollution, countries all over the world have paid great attention to the development of electric vehicles and large-scale environmentally friendly energy storage batteries, and have formulated corresponding development plans, hoping to alleviate the increasingly severe energy crisis and air pollution. At present, large-scale lithium-ion batteries are considered ...

Claims

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Application Information

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IPC IPC(8): H01M4/1391H01M4/485H01M4/131B82Y40/00
CPCB82Y40/00H01M4/366H01M4/485H01M4/625H01M10/0525Y02E60/10
Inventor 曾乐才廖文俊蒿豪杨霖霖刘佳丽余爱水黄桃
Owner SHANGHAI ELECTRICGROUP CORP
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