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A kind of preparation method of spherical lithium titanate material

A lithium titanate, spherical technology, which is applied in the field of preparation of spherical lithium titanate materials, can solve the problems of limited application and low energy density, and achieve the effects of wide and easy availability of raw materials, increased tap density, and easy industrial production

Active Publication Date: 2020-04-24
HEFEI GUOXUAN HIGH TECH POWER ENERGY CO LTD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, low energy density is the main defect of spinel lithium titanate, which limits the application of this material

Method used

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  • A kind of preparation method of spherical lithium titanate material
  • A kind of preparation method of spherical lithium titanate material
  • A kind of preparation method of spherical lithium titanate material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A spherical lithium titanate material whose main component is lithium titanate, coated with a small amount of acidic oxide, and has a relatively low pH value.

[0029] Preparation methods such as figure 1 As shown, Ⅰ: raw and auxiliary materials, Ⅱ: mixed suspension, Ⅲ: spheroidized precursor after drying, Ⅳ: spherical lithium titanate finished product after sintering, specifically including the following steps:

[0030] 1. Weigh 53.06g of 99.5% lithium acetate and 358.23g of 95% tetrabutyl titanate respectively, that is, according to the molar ratio of Li:Ti=0.8:1, add high-shear homogeneous emulsification containing 617g of ethanol solvent Machine dissolved and mixed for 1 hour to form a uniformly dispersed transparent solution;

[0031] 2. Add 0.27 g of nano-level manganese heptoxide to the solution obtained in step 1, and then mix and disperse for 1 hour through a high-shear homogeneous emulsifier to form a uniformly dispersed suspension;

[0032] 3. Carry out clo...

Embodiment 2

[0035] A spherical lithium titanate material whose main component is lithium titanate, coated with a small amount of acidic oxide, and has a relatively low pH value.

[0036] Concrete preparation method comprises the following steps:

[0037] 1. Weigh 55.71g of 99.5% lithium acetate and 358.23g of 95% tetrabutyl titanate respectively, that is, according to the molar ratio of Li:Ti=0.84:1, add high-shear homogeneous emulsification containing 621g of ethanol solvent Machine dissolved and mixed for 1 hour to form a uniformly dispersed transparent solution;

[0038] 2. Add 0.43 g of nano-scale chromium trioxide to the solution obtained in step 1, and then mix and disperse for 1 hour through a high-shear homogeneous emulsifier to form a uniformly dispersed suspension;

[0039] 3. Carry out closed spray drying of the suspension obtained in step 2, adjust the speed of the peristaltic pump to 8rpm, and the atomization frequency to 30Hz, to obtain a spherical precursor with a spherica...

Embodiment 3

[0042] A spherical lithium titanate material whose main component is lithium titanate, coated with a small amount of acidic oxide, and has a relatively low pH value.

[0043] Concrete preparation method comprises the following steps:

[0044] 1. Weigh 55.71g of 99.5% lithium acetate and 240.16g of 95% tetraethyl titanate respectively, that is, according to the molar ratio of Li:Ti=0.84:1, add high-shear homogeneous emulsification containing 444g of methanol solvent Machine dissolved and mixed for 1 hour to form a uniformly dispersed transparent solution;

[0045] 2. Add 0.41 g of nano-scale chromium trioxide to the solution obtained in step 1, and then mix and disperse for 1 hour through a high-shear homogeneous emulsifier to form a uniformly dispersed suspension;

[0046] 3. Carry out closed spray drying of the suspension obtained in step 2, adjust the speed of the peristaltic pump to 8rpm, and the atomization frequency to 30Hz, to obtain a spherical precursor with a spheric...

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Abstract

The invention discloses a preparation method of a spherical lithium titanate material. The preparation method comprises the following steps: weighing an organic lithium source and titanate in a certain proportion, then sequentially adding into a high-shear homogenizing and emulsifying machine containing a certain amount of an alcohol solvent, and dissolving to obtain a uniformly dispersed solution; then adding a certain amount of acidic oxide, and continuing dispersing to obtain a uniformly distributed suspension; then performing closed spray drying on the suspension to obtain a spheroidized precursor; finally, sintering in an air atmosphere to obtain the spherical lithium titanate material. The soluble lithium source and a soluble titanium source are used as raw materials, so that uniformdispersion in the molecular level can be achieved; the acidic oxide is used for coating, so that the pH value of the material is properly reduced, the water absorption is relieved and a gas production problem of a battery core is improved; in addition, being the spherical material, the spherical lithium titanate material can increase the tap density; the selected raw materials are widely available, and a technical route of a high-temperature solid phase method is easier for industrial production.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a method for preparing a spherical lithium titanate material. Background technique [0002] Under the general environment of low-carbon economy, energy saving and emission reduction, new energy vehicles represent the future development direction of the automobile industry, and are a new starting point for China's automobile industry to catch up with the world's automobile industry. Lithium-ion batteries are one of the main driving forces of new energy vehicles. The industrialization of new energy vehicles will directly drive the rapid growth of the lithium-ion battery market. In addition, traditional consumer electronics, electric tools, electric bicycles and new energy storage systems have a strong impact on lithium-ion batteries. With the increasing demand, the market space for lithium-ion batteries and their materials is huge. [0003] At present, the negative e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/62H01M10/0525
CPCH01M4/366H01M4/485H01M4/62H01M4/628H01M10/0525Y02E60/10
Inventor 计佳佳
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY CO LTD CO LTD
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