Method of lithium vanadium phosphate-coated ternary material of lithium ion battery

A ternary material, lithium vanadium phosphate technology, applied in the direction of electrical components, battery electrodes, circuits, etc., can solve the problems of poor rate performance and cycle performance of ternary materials, so as to improve large rate performance, improve rate performance and cycle performance , good stability effect

Inactive Publication Date: 2017-09-26
CENT SOUTH UNIV
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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the defects of poor rate performance and cycle performance of ternary materials, and provide a method for coating lithium vanadium phosphate lithium ion battery ternary materials. The obtained vanadium lithium phosphate coated lithium ion battery three The rate performance and cycle performance of the battery prepared by the element material are better

Method used

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  • Method of lithium vanadium phosphate-coated ternary material of lithium ion battery
  • Method of lithium vanadium phosphate-coated ternary material of lithium ion battery
  • Method of lithium vanadium phosphate-coated ternary material of lithium ion battery

Examples

Experimental program
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Effect test

Embodiment 1

[0035] (1) Accurately weigh 10g Ni 0.8 co 0.15 al 0.05 (OH) 2 The ternary material precursor and 4.84g of lithium hydroxide monohydrate (the molar ratio of the metal element in the ternary material precursor to the lithium element in the lithium source is =1:1.05), grind for 1 hour and mix evenly, put it into a tubular resistance furnace In an oxygen atmosphere, at a heating rate of 5°C / min, pre-sintering at 450°C for 6h, calcining at 750°C for 12h, and grinding for 1h after cooling, the particle size after grinding is 8-12 microns, to obtain LiNi 0.8 co 0.15 al 0.05 o 2 Ternary materials, put them in the oven for later use;

[0036] (2) Accurately weigh 0.0272g lithium carbonate, 0.0574g ammonium metavanadate, 0.0846g ammonium dihydrogen phosphate, 0.0927g dihydrate oxalic acid (carbon source), control the lithium element in the lithium source, the vanadium element in the vanadium source, The molar ratio of the phosphorus element in the phosphorus source to the carbon ...

Embodiment 2

[0041] (1) Accurately weigh 10g Ni 0.6 co 0.2 mn 0.2 (OH) 2 The ternary material precursor and 4.69g lithium carbonate (the molar ratio of the metal element in the ternary material precursor to the lithium element in the lithium source is =1:1.05), gently grind for 1h and mix well, put it into a tube resistance furnace , in an oxygen atmosphere at a heating rate of 5°C / min, pre-sintered at 550°C for 6h, sintered at 800°C for 15h, ground after cooling, the particle size after grinding is 8-12 microns, and the grinding time is 1h; LiNi 0.6 co 0.2 mn 0.2 o 2 Ternary materials, put them in the oven for later use;

[0042] (2) Accurately weigh 0.0375g of lithium acetate dihydrate, 0.0287g of ammonium metavanadate, 0.0423g of ammonium dihydrogen phosphate, 0.0589g of citric acid, and 0.0066g of glucose (both citric acid and glucose are carbon sources). The molar ratio of lithium element, vanadium element in vanadium source, phosphorus element in phosphorus source, and carbon ...

Embodiment 3

[0046] (1) Accurately weigh 10g Ni 0.8 co 0.15 Al 0.05 (OH) 2 The ternary material precursor and 4.84g of lithium hydroxide monohydrate (the molar ratio of the metal element in the ternary material precursor to the lithium element in the lithium source is =1:1.05), grind for 1 hour and mix evenly, put it into a tubular resistance furnace In an oxygen atmosphere, at a heating rate of 5°C / min, pre-sintering at 500°C for 6 hours, sintering at 750°C for 15 hours, and grinding after cooling. The particle size after grinding is 8-12 microns, and the grinding time is 1h. get LiNi 0.8 co 0.15 Al 0.05 o 2 Ternary materials, put them in the oven for later use;

[0047] (2) Accurately weigh 0.7507g lithium acetate dihydrate, 0.4462g vanadium pentoxide, 0.8460g ammonium dihydrogen phosphate, 0.8658g oxalic acid dihydrate, 0.1414g citric acid (both oxalic acid and citric acid are carbon sources), and control lithium The molar ratio of lithium in the source, vanadium in the vanadium...

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Abstract

The invention relates to a method of a lithium vanadium phosphate-coated ternary material of a lithium ion battery. The active electrode material of lithium vanadium phosphate is used as a coating material, and can form a uniform coating layer at the surface of the ternary material. A preparation method comprises the following steps of (1) preparing the ternary material; (2) mixing the ternary material and the lithium vanadium phosphate; (3) calcining a mixed sample under the reduction atmosphere. The method has the advantages that the transmission rate of lithium ions of the surface-coated lithium vanadium phosphate material is quick, and the large rate property of the material is improved; the lithium vanadium phosphate material has good stability, the erosion of electrolyte to the ternary material of an inner core is effectively inhibited, the coated ternary material integrates the advantages of the ternary material and the lithium vanadium phosphate, and the good rate property and cyclic property are realized.

Description

technical field [0001] The invention relates to the field of positive electrode materials for lithium-ion batteries, in particular to a method for coating lithium-ion battery ternary materials with lithium vanadium phosphate. Background technique [0002] Lithium vanadium phosphate is a positive electrode material for polyanion lithium-ion batteries. It has the characteristics of high stability and high discharge platform. There are 3 discharge platforms in the voltage range of 3.0~4.3V: 3.61V / 3.56V, 3.69V / 3.64 V, 4.09 / 4.03V. Lithium vanadium phosphate is a fast ion conductor with NASCION structure, which has a fast channel for lithium ion migration, which makes the material have good high rate charge and discharge performance. [0003] The ternary material combines the advantages of lithium nickelate, lithium cobaltate, and lithium manganate, and has the advantages of high energy density, long cycle life, and environmental friendliness. It is currently the most promising c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04H01M4/1397H01M4/58
CPCH01M4/0471H01M4/1397H01M4/5825Y02E60/10
Inventor 郑俊超王鹏博张宝肖彬汤林波童汇喻万景张佳峰
Owner CENT SOUTH UNIV
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