Preparation method of ternary cathode material coated with TiO2 nanofibers of lithium ion battery and product

A lithium-ion battery and nanofiber technology, applied in battery electrodes, electrical components, nanotechnology, etc., can solve the problem of urgent research and development of ternary cathode materials, achieve excellent electrochemical performance, stabilize the structure of ternary materials, and improve electrochemical performance. performance effect

Active Publication Date: 2019-04-19
淮安新能源材料技术研究院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the most common positive electrode materials on the market mainly include the following types: lithium nickelate, lithium cobaltate and lithium manganate with layered structure, lithium iron phosphate with polyanio...

Method used

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  • Preparation method of ternary cathode material coated with TiO2 nanofibers of lithium ion battery and product
  • Preparation method of ternary cathode material coated with TiO2 nanofibers of lithium ion battery and product
  • Preparation method of ternary cathode material coated with TiO2 nanofibers of lithium ion battery and product

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] TiO 2 @LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 Preparation of cathode material

[0021] 1. Preparation of TiO by electrospinning 2 Nanofiber: Weigh 10ml of liquid tetrabutyl titanate, dissolve it in 30ml of ethylene glycol methyl ether, and stir it by magnetic force to form a tetrabutyl titanate mixed solution. Weigh 5g of polyvinylpyrrolidone (PVP) (Mw=1300000) and add it to 40ml prepared tetrabutyl titanate solution, continue magnetic stirring for 5h to form a uniform light yellow sol-gel precursor solution; put the prepared precursor The solution was put into a syringe with a diameter of 12 mm, placed in an electrospinning device, and the collecting plate was connected to a negative power supply to collect PVP / TiO2 nanofibers. The collected product was calcined at a high temperature of 700° C. for 2 h to obtain TiO2 nanofibers with a pore structure.

[0022] 2. Preparation of TiO 2 @LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 Positive electrode material: Lithium acetate, nickel acet...

Embodiment 2

[0024] TiO 2 @LiNi 0.5 co 0.2 mn 0.3 o 2 Preparation of cathode material

[0025] 1. Preparation of TiO by electrospinning 2 Nanofiber: Weigh 8ml of liquid tetrabutyl titanate, dissolve it in 25ml of ethylene glycol methyl ether, and stir it by magnetic force to prepare a tetrabutyl titanate mixed solution. Weigh 4g of polyvinylpyrrolidone (PVP) (Mw=1300000) and add it to 33ml prepared tetrabutyl titanate solution, continue magnetic stirring for 4h to form a uniform light yellow sol-gel precursor solution; put the prepared precursor The solution was put into a syringe with a diameter of 12 mm, placed in an electrospinning device, and the collecting plate was connected to a negative power supply to collect PVP / TiO2 nanofibers. The collected product was calcined at a high temperature of 600° C. for 1 h to obtain TiO2 nanofibers with a pore structure.

[0026] 2. Preparation of TiO 2 @LiNi 0.5 co 0.2 mn 0.3 o 2 Positive electrode material: Lithium acetate, nickel ac...

Embodiment 3

[0028] TiO 2 @LiNi 0.8 co 0.1 mn 0.1 o 2 Preparation of cathode material

[0029] 1. Preparation of TiO by electrospinning 2 Nanofiber: Weigh 5ml of liquid tetrabutyl titanate, dissolve it in 20ml of ethylene glycol methyl ether, and stir it by magnetic force to prepare a tetrabutyl titanate mixed solution. Weigh 3g of polyvinylpyrrolidone (PVP) (Mw=1300000) into 25ml prepared tetrabutyl titanate solution, continue magnetic stirring for 2h to form a uniform light yellow sol-gel precursor; put the prepared precursor The solution was put into a syringe with a diameter of 12 mm, placed in an electrospinning device, and the collecting plate was connected to a negative power supply to collect PVP / TiO2 nanofibers. The collected product was calcined at a high temperature of 500° C. for 1 h to obtain TiO2 nanofibers with a pore structure.

[0030] 2. Preparation of TiO 2 @LiNi 0.8 co 0.1 mn 0.1 o 2 Positive electrode material: Lithium acetate, nickel acetate, cobalt acet...

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Abstract

The present invention discloses a preparation method of a ternary cathode material coated with TiO2 nanofibers of a lithium ion battery and a product. The method comprises the following steps of: 1) employing an electrostatic spinning method to synthesize TiO2 nanofibers; 2) preparing a composite material formed by the ternary cathode material coated with TiO2 nanofibers through high-temperature reaction, wherein the structure general formula is shown as: TiO2@LiNixCoyMnzO2, wherein 0<x<1,0<y<1,0<z<1, and x+y+z=1. The ternary cathode material coated with TiO2 nanofibers can improve the material structure stability and can reduce the side reaction between the electrolyte and the active material so as to effectively improve the cycle performance of the material. The preparation method provided by the invention is effective and rapid, and the ternary cathode material coated with TiO2 nanofibers has a good electrochemical performance.

Description

technical field [0001] The invention relates to the technical field of lithium ion battery cathode material manufacturing, in particular to a TiO 2 A preparation method and product of a lithium-ion battery ternary cathode material coated with nanofibers. Background technique [0002] Lithium-ion batteries are widely used due to their advantages such as high energy density, high voltage and long cycle life, and the commercialized automotive industry needs to further improve energy density and safety. The key to meeting this challenge The factor is the search for new high-capacity electrode materials, especially cathode materials. At present, the most common cathode materials on the market mainly include the following types: lithium nickelate, lithium cobaltate and lithium manganate with layered structure, lithium iron phosphate with polyanion structure, and LiMn with spinel structure. 2 o 4 etc., the above materials can no longer fully meet the needs of the next generation...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/48H01M4/505H01M4/525H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/366H01M4/48H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 封平净刘耀春卢鹏李明
Owner 淮安新能源材料技术研究院
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