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Preparation method of novel nano manganese lithium titanate LiMnxTiO4 cathode material

A technology of lithium manganese titanate, cathode material, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problem of unsolved battery safety, low material gram capacity, and expensive cobalt source and other problems, to achieve the effects of excellent electrochemical performance, simple preparation process, and regular particle morphology.

Inactive Publication Date: 2016-05-11
SHANDONG GOLDENCELL ELECTRONICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Lithium iron phosphate has excellent cycle performance and good safety, but the gram capacity of the material is low; nickel-cobalt lithium manganese oxide has a high specific capacity, but the safety of the single battery has not been solved; the cycle of lithium manganate material Good performance, but poor high temperature performance; the cobalt source of lithium acid material is expensive and highly toxic

Method used

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  • Preparation method of novel nano manganese lithium titanate LiMnxTiO4 cathode material
  • Preparation method of novel nano manganese lithium titanate LiMnxTiO4 cathode material
  • Preparation method of novel nano manganese lithium titanate LiMnxTiO4 cathode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The preparation method of nano-manganese lithium titanate positive electrode material: Weigh 4.196g lithium hydroxide, 14.295g manganese oxalate, 28.422g tetrabutyl titanate in sequence, respectively add to 35g of absolute ethanol and stir to dissolve, then add 2g of PEG2000, Electric stirring 2h until completely dissolved. The solution was transferred to a 50ml Teflon-lined reactor for solvothermal reaction at 170°C for 4h, and then suction filtered, washed, and dried to obtain a lithium manganese titanate precursor. The precursor was calcined at a high temperature of 900°C for 6 hours, cooled and then ground to obtain the nano manganese lithium titanate positive electrode material.

[0026] The prepared materials were tested and analyzed by X-ray diffractometer and scanning electron microscope respectively. figure 1 It can be seen that the characteristic diffraction intensity of the material is strong, so it has a high degree of crystallinity, figure 2 It can be se...

Embodiment 2

[0028] The preparation method of nano-manganese lithium titanate positive electrode material: Weigh 10.2g lithium acetate, 10.38g manganese acetate, 28.42g isopropanol titanate in sequence, add to 25g absolute ethanol and stir to dissolve, then add 1.5g PEG2000, Electric stirring 2h until completely dissolved. The solution was transferred to a 50ml Teflon-lined reactor for solvothermal reaction at 90°C for 12 hours, and then suction filtered, washed, and dried to obtain a lithium manganese titanate precursor. The precursor was calcined at a high temperature of 650°C for 12 hours, cooled and then ground to obtain the nano manganese lithium titanate positive electrode material.

[0029] Similarly, the X-ray diffractometer and scanning electron microscope are used to test and analyze the prepared material, which shows that the material has strong crystallinity and relatively regular morphology, and the particle size is about 100-200nm. The battery made with this sample has a cap...

Embodiment 3

[0031] The preparation method of nano-manganese lithium titanate positive electrode material: Weigh 7.389g lithium carbonate, 17.3g manganese acetate, 28.42g isopropanol titanate in sequence, add to 25g of absolute ethanol and stir to dissolve, then add 2.2g of PEG2000, Electric stirring 2h until completely dissolved. The solution was transferred to a 50ml Teflon-lined reactor for solvothermal reaction at 120°C for 8 hours, and then suction filtered, washed, and dried to obtain a lithium manganese titanate precursor. The precursor is calcined at a high temperature of 750°C for 10 hours, cooled and then ground to obtain the nano manganese lithium titanate positive electrode material.

[0032] Similar to Examples 1 and 2, X-ray diffractometer and scanning electron microscope were used to test and analyze the prepared material. The test results showed that the material had very good crystallinity and the size was about 150-200 nm. The button cell made of this sample still mainta...

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Abstract

The invention relates to a preparation method of a novel nano manganese lithium titanate cathode material. The preparation method comprises: firstly, preparing a manganese lithium titanate precursor by combining a solvothermal method with a solid phase method; then preparing the carbon coated nano manganese lithium titanate cathode material by utilizing a high-temperature calcination method. By testing, the material is relatively structured in morphology, has a size of about 50 to 200 nanometers, and has a high crystallinity degree and excellent electrochemical performance. Meanwhile, the material is relatively simple in steps of a synthetic process, is easy for controlling the process, and is suitable for large-scale industrial production.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a novel nanometer lithium manganese titanate LiMn x TiO 4 Preparation method of cathode material. Background technique [0002] With the rapid development of society, the demand for energy is increasing. Traditional energy sources such as coal and oil can no longer meet the energy needs of human beings, and will also bring serious environmental pollution problems. Therefore, the technological development of new energy becomes. As a new type of green energy, lithium-ion batteries have the characteristics of high specific capacity, good cycle stability, safety and reliability, and have been widely researched and commercialized. [0003] As we all know, the cathode material is a key component of lithium batteries, which determines the electrochemical performance of lithium batteries. At present, the mainstream cathode materials that have been commercially produced main...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/62H01M4/485H01M4/505H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/366H01M4/485H01M4/505H01M4/628H01M10/0525Y02E60/10
Inventor 关成善宗继月李涛梅庆虎周会
Owner SHANDONG GOLDENCELL ELECTRONICS TECH
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