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Preparation method of lithium ion battery cathode material lithium vanadium phosphate

A lithium ion battery, lithium vanadium phosphate technology, applied in battery electrodes, phosphates, phosphorus oxyacids, etc., can solve the problems of long cycle and complex production process of lithium vanadium phosphate, and achieve energy saving and good cycle stability , the effect of high specific capacity

Inactive Publication Date: 2018-10-12
PANZHIHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved in the present invention is that the production process for preparing lithium vanadium phosphate lithium ion battery cathode material is complicated and the cycle is long

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  • Preparation method of lithium ion battery cathode material lithium vanadium phosphate
  • Preparation method of lithium ion battery cathode material lithium vanadium phosphate
  • Preparation method of lithium ion battery cathode material lithium vanadium phosphate

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preparation example Construction

[0026] The invention provides a preparation method of lithium vanadium phosphate lithium ion battery cathode material, the method comprising the following steps:

[0027] a. Liquid phase mixing reaction: dissolving lithium nitrate, ammonium metavanadate, ammonium dihydrogen phosphate, carbon source, amine organic matter and additives into water to obtain a solution;

[0028] The consumption of described lithium nitrate, ammonium metavanadate and ammonium dihydrogen phosphate is 3:2:3 by lithium, vanadium, phosphorus element meter molar ratio; The consumption of described lithium nitrate and carbon source is meter lithium and carbon element molar ratio 1:2-4; the molar ratio of the lithium nitrate to the amine organic matter is 1:1-3; the amount of the additive is 0.1-3% of the quality of the prepared lithium vanadium phosphate, and the additive is selected from ferric nitrate, nitric acid At least one of aluminum, chromium nitrate, and magnesium nitrate;

[0029] b. Preparati...

Embodiment 1

[0043] Dissolve 0.02mol ammonium metavanadate, 0.03mol ammonium dihydrogen phosphate, 0.03mol lithium nitrate, 0.06mol glycine, 2g glucose and 0.3g ferric nitrate in 150mL deionized water at room temperature to prepare a solution. Heating and stirring on a temperature-controlled electric furnace, heating to 100°C, the solution is volatilized and concentrated to form a colloidal substance, and the precursor powder is obtained after the reaction is completed, and the precursor powder is kept at 800°C under a nitrogen atmosphere for 4 hours to obtain a lithium-ion battery The positive electrode material is lithium vanadium phosphate. figure 1 It shows that lithium vanadium phosphate has a porous sheet structure, figure 2 It shows that the product has a good lithium vanadium phosphate structure, image 3 It shows that the first discharge capacity of the lithium battery performance test is 145mAh / g, and there is still a discharge capacity of 130mAh / g after 1000 cycles at a charge...

Embodiment 2

[0045] Dissolve 0.02mol ammonium metavanadate, 0.03mol ammonium dihydrogen phosphate, 0.03mol lithium nitrate, 0.07mol glycine, 2.5g citric acid and 0.4g ferric nitrate in 150mL deionized water at room temperature to prepare a solution. Heating and stirring on a temperature-controllable electric furnace, heating to 100°C, the solution is volatilized and concentrated to form a colloidal substance, and the precursor powder is obtained after the reaction is completed, and the precursor powder is kept at 700°C under an argon atmosphere for 6 hours to obtain Lithium vanadium phosphate lithium ion battery cathode material. Gained material structure is identical with embodiment 1, has porous sheet structure, figure 2 It shows that the product has a good lithium vanadium phosphate structure, Figure 4 It shows that the first discharge capacity of the lithium battery property test is 148mAh / g, and there is still a discharge capacity of 120mAh / g after 1000 cycles at a charge and disch...

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Abstract

The invention discloses a preparation method of a lithium ion battery cathode material lithium vanadium phosphate, belonging to the field of lithium ion batteries. The technical problem solved by theinvention is that the existing lithium ion battery cathode material lithium vanadium phosphate is complicated in production process, long in cycle, and large in energy consumption. The method comprises the steps of: a, liquid-phase mixing reaction: dissolving lithium nitrate, ammonium metavanadate, ammonium dihydrogen phosphate, carbon source, amine organic matter and additives into water to prepare a solution; b, preparation of precursor: heating and stirring the solution in the step a, heating until the solution is evaporated, and concentrating to form a gelatinous substance, so as to obtainprecursor powder lithium vanadium phosphate after completion of the reaction; and c, carbothermal reduction reaction: preserving temperature of the precursor powder lithium vanadium phosphate at 650-800 degrees centigrade for 4-8 hours under the protection of inert gases to obtain the lithium ion battery cathode material lithium vanadium phosphate. The method provided by the invention has the advantages of simple process steps, short time, energy saving and cost reduction.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and in particular relates to a preparation method of lithium vanadium phosphate, a cathode material of lithium ion batteries. Background technique [0002] Lithium vanadium phosphate is a relatively new type of cathode material at present. Due to the special structure of phosphate polyanion, it has extremely high thermal stability and is a lithium-ion battery cathode material with a high safety factor. It makes up for the current lithium-ion battery cathode material LiCoO. 2 The disadvantage of poor safety, although lithium vanadium phosphate and lithium iron phosphate are both phosphate materials, the theoretical capacity of lithium vanadium phosphate is higher than that of lithium iron phosphate, and the low-temperature discharge performance is also significantly better than lithium iron phosphate, while lithium vanadium phosphate The voltage can reach 4.8V, which is much higher than the 3....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M10/0525C01B25/26C01B25/45
CPCC01B25/26C01B25/45H01M4/5825H01M10/0525Y02E60/10
Inventor 曹知勤崔旭梅张雪峰刘枝越周晓飞杜林燕杜小凤武川阳
Owner PANZHIHUA UNIV
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