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Ferric fluoride/lithium hexafluoroferrate composite positive material and application thereof

A composite positive electrode material, lithium hexafluoroferrate technology, applied in battery electrodes, electrochemical generators, electrical components, etc., can solve the problems of long synthesis process, expensive raw materials, and decreased energy density of batteries, and achieve low cost and preparation The process is simple and the effect of reducing losses

Active Publication Date: 2017-10-10
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these solutions usually have a long synthesis process, and some raw materials are relatively expensive. In addition, due to the use of more carbon materials, the energy density of the assembled battery will also decrease.

Method used

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  • Ferric fluoride/lithium hexafluoroferrate composite positive material and application thereof
  • Ferric fluoride/lithium hexafluoroferrate composite positive material and application thereof
  • Ferric fluoride/lithium hexafluoroferrate composite positive material and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0077] Take 1.5g of FeF with a particle size of 200nm 3 ·3H 2 O was added to 40mL of ethanol, and the mixed solution was ultrasonicated for 30 minutes. Another 30mL of ethanol was taken, and 0.025g of lithium chloride was added, and stirred to dissolve all the lithium chloride in the ethanol solution. The ethanol was added dropwise at a rate of 1mL / min to the FeF 3 ·3H 2 In the ethanol solution of O, the reaction temperature is 25°C. After continuous stirring and reaction for 12 hours, centrifuge and dry in an oven at 60°C for 24 hours. The heating rate is heated to 225°C, and the heating is continued for 10 hours, and the whole process is protected by argon to obtain FeF with a particle size of 200nm. 3 0.33H 2 O / Li 3 FeF 6 Composite material, Li 3 FeF 6 The thickness of the protective layer was 0.5 nm. After charge and discharge tests, the first discharge specific capacity of this composite material is 480mAh / g, and the capacity is still 150mAh / g after 100 cycles. ...

Embodiment 2

[0079] Take 1.5g of FeF with a particle size of 200nm 3 ·3H 2 O was added to 40mL of ethanol, and the mixed solution was ultrasonicated for 30 minutes, and another 30mL of ethanol was taken, and 0.05g of lithium chloride was added, and stirred to dissolve all the lithium chloride in the ethanol solution. The ethanol was added dropwise at a rate of 1mL / min to the FeF 3 ·3H 2 In the ethanol solution of O, the reaction temperature is 25°C. After continuous stirring and reaction for 12 hours, centrifuge and dry in an oven at 60°C for 24 hours. The heating rate is heated to 225°C, and the heating is continued for 10 hours, and the whole process is protected by argon to obtain FeF with a particle size of 200nm. 3 0.33H 2 O / Li 3 FeF 6 Composite material, Li 3 FeF 6 The thickness of the protective layer was 1 nm. After charge and discharge tests, the first discharge specific capacity of this composite material is 497mAh / g, and the capacity is still 174mAh / g after 100 cycles. ...

Embodiment 3

[0081] Take 1.5g of FeF with a particle size of 200nm 3 ·3H 2 O was added to 40mL of ethanol, and the mixed solution was ultrasonicated for 30 minutes, and another 30mL of ethanol was taken, and 0.2g of lithium chloride was added, and stirred to dissolve all the lithium chloride in the ethanol solution. The ethanol was added dropwise at a rate of 1mL / min to the FeF 3 ·3H 2 In the ethanol solution of O, the reaction temperature is 25°C. After continuous stirring and reaction for 12 hours, centrifuge and dry in an oven at 60°C for 24 hours. The heating rate is heated to 225°C, and the heating is continued for 10 hours, and the whole process is protected by argon to obtain FeF with a particle size of 200nm. 3 0.33H 2 O / Li 3 FeF 6 Composite material, Li 3 FeF 6 The thickness of the protective layer was 20 nm. After charge and discharge tests, the first discharge specific capacity of this composite material is 380mAh / g, and the capacity is still 80mAh / g after 100 cycles.

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Abstract

The invention provides a ferric fluoride / lithium hexafluoroferrate composite positive material, and the composite positive material consists of ferric fluoride and a lithium hexafluoroferrate layer on the surface of the ferric fluoride. The invention also provides a preparation method of the ferric fluoride / lithium hexafluoroferrate composite positive material. The preparation method comprises the following steps: mixing ferric fluoride powder, inorganic lithium salt and an organic solvent together, continuously stirring for a certain period of time, and carrying out low-temperature treatment so that the ferric fluoride / lithium hexafluoroferrate composite positive material can be obtained. For the problems such as the loss of active substances in the ferric fluoride occurring in the charging and discharging process and side reactions occurring when the ferric fluoride is directly in contact with an electrolyte, the surface of ferric fluoride particles is converted into the lithium hexafluoroferrate layer in the organic solvent in situ, so that the protective layer can effectively reduce the capacity loss of the ferric fluoride in the cycling process, and the cycling stability of the positive material is strengthened; and moreover, the method provided by the invention is simple in preparation process and relatively low in cost, and is beneficial for industrial production.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a ferric trifluoride / lithium hexafluoroferrite composite positive electrode material and a preparation method thereof. Background technique [0002] Petroleum and coal-based fossil energy can no longer meet the requirements of sustainable development of human beings. It is imperative to improve the energy consumption structure and reduce dependence on fossil energy. As a new energy storage device at the forefront of scientific research, lithium-ion batteries have been widely used in small electronic products, electric transportation equipment, power reserve, aerospace and other fields, but at this stage there is an urgent need for higher energy density, higher power, and longer life Longer, green and environmentally friendly lithium secondary batteries meet the rapid development of various application fields. [0003] However, in the production of lithium-ion batte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/525H01M4/58H01M10/0525
CPCH01M4/366H01M4/525H01M4/582H01M10/0525Y02E60/10
Inventor 杨娟周向阳徐章林孙洪旭丁静
Owner CENT SOUTH UNIV
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