Near cubic lithium vanadium phosphate and preparation method thereof, lithium ion battery and positive electrode thereof

A technology of lithium vanadium phosphate and battery positive electrode is applied in the field of preparation and application of new energy materials, and can solve the problems of complicated operation and many synthesis steps.

Active Publication Date: 2019-08-13
ANHUI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, they all have the disadvantages of cumbersome operation and many synthesis steps.

Method used

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  • Near cubic lithium vanadium phosphate and preparation method thereof, lithium ion battery and positive electrode thereof
  • Near cubic lithium vanadium phosphate and preparation method thereof, lithium ion battery and positive electrode thereof
  • Near cubic lithium vanadium phosphate and preparation method thereof, lithium ion battery and positive electrode thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1) Add 1.171g of ammonium metavanadate and 1.89g of oxalic acid into 25ml of deionized water and stir to dissolve, then add 1.725g of ammonium dihydrogen phosphate and 1.03g of lithium nitrate and continue stirring to obtain solution A;

[0033] (2) 1.09g cetyltrimethylammonium bromide (CTAB) was stirred and dispersed into 25ml deionized water to obtain solution B;

[0034] (3) Add solution B dropwise to solution A, then add 30ml ethylene glycol and 3.604g urea and stir for 24h to prepare solution C;

[0035] (4) Put the solution C into a polytetrafluoroethylene reactor and put it in an oven, react at 150°C for 20 hours to prepare the precursor, then centrifuge, wash with water, wash with alcohol and dry;

[0036] (5) The precursor was placed in an argon protective atmosphere, and calcined at a temperature of 800° C. for 4 hours to obtain near-cubic lithium vanadium phosphate A1.

Embodiment 2

[0038] According to the method of embodiment 1, near cubic lithium vanadium phosphate A2 is obtained, the difference is that the amount of urea added in step (3) is 3g.

Embodiment 3

[0040] According to the method of Example 1, near-cubic lithium vanadium phosphate A3 was prepared, except that the amount of ethylene glycol added in step (3) was 20ml.

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Abstract

The invention discloses nearly cubic lithium vanadium phosphate and a preparation method thereof, a lithium-ion battery and a positive electrode of the lithium-ion battery. The preparation method comprises the steps of (1) adding a vanadium source and a reducing agent to deionized water for stirring and dissolving, and then adding a phosphorus source and lithium nitrate for further stirring to obtain a solution A; (2) evenly stirring and dispersing hexadecyl trimethyl ammonium bromide (CTAB) into the deionized water to obtain a solution B; (3) dropwise adding the solution B to the solution A, adding ethylene glycol and urea for stirring for 22-25 hours to prepare a solution C; (4) carrying out hydrothermal reaction on the solution C to prepare a precursor; and (5) burning the precursor in an inert gas protection atmosphere to prepare the nearly cubic lithium vanadium phosphate. According to the method, the process is simple, the synthesis pathway is simple and controllable and micro control on the shape and the size of the material is easy to implement; and the prepared nearly cubic lithium vanadium phosphate is an excellent positive electrode material of the lithium-ion battery, so that the lithium-ion battery assembled by the positive electrode has high specific discharge capacity.

Description

technical field [0001] The invention relates to the preparation and application of new energy materials, in particular to near-cubic lithium vanadium phosphate and a preparation method thereof, a lithium ion battery and a positive electrode thereof. Background technique [0002] As a new type of energy storage power supply, lithium-ion batteries have the advantages of high working voltage, high energy density, no memory effect, and low discharge rate. They are now widely used in electric vehicles, communication equipment, energy storage equipment, aerospace and other fields. Among them, the positive electrode of the battery plays an important role in the performance of the battery. [0003] Lithium-ion battery cathode materials mainly include lithium cobalt oxide, lithium manganese oxide, and lithium iron phosphate, etc., but the development of these three materials has been restricted due to problems such as resource volume, use cost, use safety, and use performance. Resea...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/58H01M10/0525C01B25/45
CPCC01B25/45H01M4/5825H01M10/0525Y02E60/10
Inventor 耿保友孙红霞
Owner ANHUI NORMAL UNIV
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