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Li<2-2x>FexTiO3/Li3PO4 conjugate coated lithium ion phosphate material as well as preparation method and application thereof

A lithium ferrous phosphate and conjugation technology is applied in the field of positive electrode materials of lithium ion batteries, which can solve the problems of poor controllability, unsatisfactory ion conductivity and electrochemical performance, uneven surface coating, etc. The effect of easy large-scale industrial production and short preparation cycle

Active Publication Date: 2015-08-26
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current preparation methods of positive electrode materials, the ionic conductivity and electrochemical performance of the material cannot meet the requirements, and the surface coating is uneven and the controllability is poor.

Method used

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  • Li&lt;2-2x&gt;FexTiO3/Li3PO4 conjugate coated lithium ion phosphate material as well as preparation method and application thereof
  • Li&lt;2-2x&gt;FexTiO3/Li3PO4 conjugate coated lithium ion phosphate material as well as preparation method and application thereof
  • Li&lt;2-2x&gt;FexTiO3/Li3PO4 conjugate coated lithium ion phosphate material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] 1) According to the molar ratio FeO: LiOH: LiFePO 4 : TiO 2 =0.2:1.85:2.593:1, weigh FeO, TiO 2 The powder and LiOH particles are placed in a high-pressure container, and an appropriate amount of distilled water is added to the high-pressure container according to the volume ratio of water to 50%, fully dissolved, so that Li + The concentration is 2.04mol / L;

[0042] 2) Molar ratio of LiFePO 4 :H 4 N 2 ·H 2 O=0.5:1; Weigh hydrazine hydrate and add it to the mixed slurry in step 1;

[0043] 3) Ultrasonic treatment is performed on the mixed slurry obtained in step 2, the ultrasonic power is 100W, and the ultrasonic time is 5min, until the slurry is evenly mixed and becomes black;

[0044] 4) Seal the uniformly mixed slurry in step 3 in a high-pressure container, place the high-pressure container in an oven at 200° C. for 15 hours, and take it out after cooling to room temperature;

[0045] 5) Put the hydrothermal product obtained in step 4 into an oven and dry at ...

Embodiment 2

[0049] 1) According to the molar ratio FeO: LiOH: LiFePO 4 : TiO 2 =0.4:1.45:2.593:1, weigh FeO, TiO 2 The powder and LiOH particles are placed in a high-pressure container, and an appropriate amount of distilled water is added to the high-pressure container according to the volume ratio of water to 40% to fully dissolve the LiOH. + The concentration is 1.84mol / L;

[0050] 2) Molar ratio of LiFePO 4 :H 4 N 2 ·H 2 O=5:1; Weigh hydrazine hydrate and add it to the mixed slurry in step 1;

[0051] 3) Ultrasonic treatment is performed on the mixed slurry obtained in step 2, the ultrasonic power is 200W, and the ultrasonic time is 1min, until the slurry is evenly mixed and becomes black;

[0052] 4) Seal the uniformly mixed slurry in step 3 in a high-pressure container, place the high-pressure container in an oven and keep it warm at 200°C for 18 hours, and take it out after cooling to room temperature;

[0053] 5) Put the hydrothermal product obtained in step 4 into an oven...

Embodiment 3

[0057] 1) According to the molar ratio FeO: LiOH: LiFePO 4 : TiO 2 =0.7:1.00:0.6:1, weigh FeO, TiO 2 The powder and LiOH particles are placed in a high-pressure container, and an appropriate amount of distilled water is added to the high-pressure container according to the volume ratio of water to 70% to fully dissolve, so that Li + The concentration is 0.50mol / L;

[0058] 2) Molar ratio of LiFePO 4 :H 4 N 2 ·H 2 O=3:1; Weigh hydrazine hydrate and add it to the mixed slurry in step 1;

[0059] 3) Ultrasonic treatment is performed on the mixed slurry obtained in step 2, the ultrasonic power is 200W, and the ultrasonic time is 10min, until the slurry is uniformly mixed and becomes black;

[0060]4) Seal the uniformly mixed slurry in step 3 in a high-pressure container, place the high-pressure container in an oven at 240° C. for 20 hours, and take it out after cooling to room temperature;

[0061] 5) Put the hydrothermal product obtained in step 4 into an oven and dry at ...

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Abstract

The invention discloses a Li<2-2x>FexTiO3 / Li3PO4 conjugate coated lithium ion phosphate material as well as a preparation method and application thereof. The material is obtained by coating LiFePO4 with Li<2-2x>FexTiO3 and Li3PO4 which grow conjugately, wherein x is more than or equal to 0 and less than or equal to 0.7. The conjugate growth coating material of the material is variable in composition and controllable in coating degree. According to the method, the Li<2-2x>FexTiO3 (x being more than or equal to 0 and less than or equal to 0.7) and the Li3PO4 conjugately grow on the surface of a cathode material for a lithium ion battery for modification, the conjugate growth coated cathode material obtained by adopting the method has a uniform surface coating, and the method is mature and reliable.

Description

technical field [0001] The invention relates to the technical field of lithium ion battery cathode materials, in particular to a Li 2- 2x Fe x TiO 3 / Li 3 PO 4 Conjugated coated lithium iron phosphate material and its preparation method and application. Background technique [0002] Lithium-ion battery is a new type of green chemical power source. Compared with traditional nickel-chromium batteries and nickel-metal hydride batteries, it has the advantages of high voltage, long life, small size, low self-discharge rate, and high capacity and energy density. However, since lithium iron phosphate does not have continuous [FeO 6 ] Co-edge octahedral network, it can not form electronic conductivity. At the same time, due to the [PO 4 ] The tetrahedron restricts the change of the lattice volume, which affects the lithium ion deintercalation and the diffusion of electrons, resulting in LiFePO 4 Cathode materials have extremely low electronic conductivity and ion diffusivit...

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M10/0525H01M4/525H01M4/36
CPCH01M4/366H01M4/525H01M4/5825H01M10/0525Y02E60/10
Inventor 于成龙惠怀兵郝欣高举曹舒尧王斐高丹鹏王道益杨龙涛刘立炳
Owner SHAANXI UNIV OF SCI & TECH
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