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Anode material-nanometer vanadium iron manganese lithium phosphate of lithium ion battery and preparation method of anode material

A technology for lithium vanadium iron manganese phosphate and lithium ion batteries, which can be applied to battery electrodes, circuits, electrical components, etc., and can solve problems such as low safety of oxide positive electrode materials, unstable structure of lithium manganese phosphate materials, and poor cycle performance , to achieve excellent cycle stability, reduce product cost, and shorten the process

Active Publication Date: 2013-05-08
WUHU HUAXINNUO ELECTROCHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the deficiencies in the prior art, the object of the present invention is to provide a lithium-ion battery positive electrode material nano vanadium iron manganese phosphate and its preparation method, the positive electrode material has the advantages of high specific energy and specific capacity, good safety, overcomes the Among the existing positive electrode materials for lithium-ion power batteries, the discharge voltage platform and specific energy of lithium iron phosphate materials are low, the structure of lithium manganese phosphate materials is unstable, the cycle performance is poor, and the safety of oxide positive electrode materials is not high. Provide high safety, high specific energy, and low-cost cathode materials

Method used

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  • Anode material-nanometer vanadium iron manganese lithium phosphate of lithium ion battery and preparation method of anode material
  • Anode material-nanometer vanadium iron manganese lithium phosphate of lithium ion battery and preparation method of anode material

Examples

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Embodiment 1

[0025] A lithium-ion battery cathode material consisting of carbon-coated lithium vanadium-iron-manganese phosphate, the chemical formula of which is LiV x Fe y mn 1-3 / 2x-y PO 4 , where x=0.3, y=0.5.

[0026] A method for preparing a positive electrode material for a lithium ion battery, the steps comprising:

[0027] In an electrolytic cell without a diaphragm, a pure iron plate is used as the anode, a stainless steel 1Cr18Ni9Ti plate is used as the cathode, and 1.0 mol / L phosphoric acid aqueous solution is used as the electrolyte. 2 Electrolyze the ferric ion phosphoric acid solution for 6 h with the electric current; add manganese acetate and vanadium pentoxide into the adjusted ferric ion phosphoric acid aqueous solution, heat to 40°C, stir and mix at a speed of 600 r / min for 2 h, then add hydrogen Lithium oxide, citric acid and glucose, continue stirring and reacting for 10 h to obtain rheological phase liquid, the molar ratio of lithium, vanadium, iron, manganese, p...

Embodiment 2

[0031] A lithium-ion battery cathode material consisting of carbon-coated lithium vanadium-iron-manganese phosphate, the chemical formula of which is LiV x Fe y mn 1-3 / 2x-y PO 4 , where x=0.2, y=0.5.

[0032] A method for preparing a positive electrode material for a lithium ion battery, the steps comprising:

[0033] In an electrolytic cell without a diaphragm, a pure iron rod is used as the anode, a stainless steel mesh is used as the cathode, 1.8 mol / L phosphoric acid aqueous solution is used as the electrolyte, the temperature of the electrolyte is 24°C, and a current of 4.5 A / dm2 is electrolyzed for 1.2 h to obtain ferric ions Phosphoric acid solution: Add manganese carbonate and vanadium pentoxide into the adjusted ferric ion phosphoric acid aqueous solution, heat to 50°C, stir and mix at a speed of 400r / min for 3h, then add lithium hydroxide, citric acid and glucose, and continue stirring After reacting for 10 hours, the rheological phase liquid was obtained, and the ...

Embodiment 3

[0037] A lithium-ion battery cathode material consisting of carbon-coated lithium vanadium-iron-manganese phosphate, the chemical formula of which is LiV x Fe y mn 1-3 / 2x-y PO 4 , where x=0.1, y=0.3.

[0038] A method for preparing a positive electrode material for a lithium ion battery, the steps comprising:

[0039] Add ferrous acetate, diammonium hydrogen phosphate, manganese acetate and ammonium metavanadate into pure water, heat to 60°C, stir and mix at a speed of 300r / min for 3 hours, then add lithium dihydrogen phosphate, citric acid and glucose, and continue stirring After reacting for 10 hours, the rheological phase liquid was obtained, and the molar ratio of lithium, vanadium, iron, manganese, phosphorus and carbon in the rheological phase liquid was 1.0: 0.1: 0.3: 0.55: 1.0: 0.08, and the mass ratio of citric acid and glucose was 1: 2;

[0040] Spray-dry the rheological phase liquid with a high-speed centrifugal spray dryer to obtain the precursor of vanadium-i...

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Abstract

The invention discloses an anode material-nanometer vanadium iron manganese lithium phosphate of a lithium ion battery and a preparation method of the anode material. The anode material comprises carbon-coated nanometer vanadium iron manganese lithium phosphate, the primary particle size is 50-200 nm, and a chemical formula of nanometer vanadium iron manganese lithium phosphate is LiVxFeyMn(1-3 / 2x-y)PO4, wherein x is more than 0 and not more than 0.3 and y is more than 0 and not more than 0.5. The preparation method adopts an electrochemical-rheological phase method and comprises the steps of preparing a precursor, spray-drying and roasting. The anode material has the advantages of high specific energy and specific capacity and good safety; and the preparation method is easy for acquisition of raw materials, simple in process and low in production cost, and is suitable for large-scale industrial production.

Description

technical field [0001] The invention belongs to the technical field of chemical batteries, and in particular relates to a lithium-ion battery anode material nano vanadium iron manganese phosphate and a preparation method thereof. Background technique [0002] With the gradual depletion of the world's oil resources and the requirements for environmental protection, the development of electric vehicles, especially electric vehicles, has become a strategic goal for the development of new energy in the world. Lithium-ion battery is a kind of green battery. Compared with other secondary batteries, it has the characteristics of high energy density, no memory effect, no pollution, and long life. It is widely used in various portable electronic products and mobile tools. High safety, high specific energy, and low cost are the basic elements of electric vehicle power batteries, and are also key topics in the research and development of power batteries. The development and industrial...

Claims

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Application Information

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IPC IPC(8): H01M4/58
CPCY02E60/12Y02E60/10
Inventor 褚道葆袁希梅
Owner WUHU HUAXINNUO ELECTROCHEM TECH
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