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A preparing method and application of a positive electrode material of a lithium ion battery

A technology for lithium-ion batteries and cathode materials, applied in the field of functional material preparation, can solve the problems of difficult to provide high energy density, poor cycle stability, low specific capacity, etc., to increase lithium storage sites and maintain integrity. , the effect of prolonging the cycle life

Inactive Publication Date: 2018-12-04
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to solve the current V 2 o 5 Lithium-ion battery cathode materials, due to their poor cycle stability and low specific capacity, it is difficult to provide high energy density for practical production problems

Method used

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  • A preparing method and application of a positive electrode material of a lithium ion battery
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  • A preparing method and application of a positive electrode material of a lithium ion battery

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Embodiment 1

[0023] 1) First, synthesize vanadyl oxalate according to the existing literature: take (1.2g, 6.60mmol) of V 2 O 5 Add to 80 mL of water, and then add (2.4 g, 19.00 mmol) of oxalic acid dihydrate. Transfer the above aqueous solution to a 250 mL evaporating dish and stir at 60°C until it is completely dry, and then put it in a vacuum oven at 60°C to dry overnight.

[0024] 2) Synthesis of V@M-1 precursor: take Fe(NO 3 ) 3 ·9H 2 O (1.62g, 4.00mmol) was added to 4mL of water to dissolve, and then vanadyl oxalate (1.0g, 4.00mmol) prepared above was added to the above solution and stirred until completely dissolved. Another trimesic acid (420mg, 2.00mmol) was added to the above solution and stirred overnight. Finally, the above solution was transferred to a hydrothermal reactor, heated at 130°C for 24 hours, and then naturally cooled to room temperature. The product was washed twice with water, DMF and methanol in turn. Place it in a blast drying oven at 70°C and dry overnight, and ...

Embodiment 2

[0027] 1) First, synthesize vanadyl oxalate according to the literature: take (0.6g, 3.30mmol) of V 2 O 5 Add to 40 mL of water, and then add (1.2 g, 9.5 mmol) of oxalic acid dihydrate. The above aqueous solution was transferred to a 250 mL evaporating dish and stirred at 80°C until it was completely dry, and then placed in a vacuum oven at 60°C to dry overnight.

[0028] 2) Synthesis of V@M-1 precursor: take Fe(NO 3 ) 3 ·9H 2 O (2.02g, 5.00mmol) was added to 5mL of water to dissolve, and then vanadyl oxalate (1.0g, 4.0mmol) prepared above was added to the above solution and stirred until completely dissolved. Another trimesic acid (840 mg, 4.00 mmol) was added to the above solution and stirred overnight. Finally, the above solution was transferred to a hydrothermal reactor, heated at 140°C for 24 hours, and then naturally cooled to room temperature. The product was washed twice with water, DMF and methanol in turn. Place it in a blast drying oven at 70°C and dry overnight, and...

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Abstract

A preparing method and application of a positive electrode material of a lithium ion battery are disclosed. V@M-1 is prepared through in-situ synthesis and is subjected, as a precursor, to a series oftreatment to obtain V2O5@C. The inventors found that high-temperature calcining in a nitrogen atmosphere of a V2O5 precursor loaded into pores of MIL-100 can promote splitting of V@M-1 having a bulkmass morphology to form a nanosheet shaped derivative. The nanosheet shaped derivative is heated in air to obtain the V2O5@C having a micro-nano structure including nanosheets or nanorods consisting of extremely small nanoparticles. Electrochemical tests prove that the V2O5@C having the micro-nano structure has high specific capacity and cyclic stability when a voltage window is 2.3-4.0 V.

Description

【Technical Field】 [0001] The invention belongs to the technical field of functional material preparation, and relates to a preparation method of a metal-organic framework material and a vanadium-based nano-material composite and its derivatives and its application in lithium ion battery cathode materials. 【Background technique】 [0002] Energy and environmental issues are major issues facing mankind after entering the 21st century. With the reduction of fossil fuels and the increasingly serious environmental issues, the development and utilization of new energy sources is the direction of the current researchers' efforts. After Sony Corporation of Japan developed the carbon anode in 1992, they combined the carbon anode with LiCoO 2 The positive electrodes were assembled together to successfully prepare a lithium-ion battery for the first time. Because it has the advantages of high energy density, good cycle stability, low self-discharge, no memory effect, and environmental friend...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/485H01M4/62H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/366H01M4/485H01M4/625H01M10/0525Y02E60/10
Inventor 师唯刘成财刘景维程鹏
Owner NANKAI UNIV
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