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Lithium ion battery positive electrode material composed of cerium oxide and carbon co-coated lithium vanadium phosphate and preparation method thereof

A carbon-coated technology for lithium vanadium phosphate and lithium ion batteries, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as poor high-rate charge and discharge performance, and achieve the effects of reducing corrosion, simple process, and fine particles

Inactive Publication Date: 2014-08-13
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The purpose of the present invention is to adopt the sol-gel method of pH value control and the suspension mixing method assisted by polyvinyl alcohol to prepare CeO 2 Co-coat lithium vanadium phosphate with carbon to improve the shortcomings of existing carbon-coated lithium vanadium phosphate cathode materials with poor high-rate charge and discharge performance

Method used

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  • Lithium ion battery positive electrode material composed of cerium oxide and carbon co-coated lithium vanadium phosphate and preparation method thereof
  • Lithium ion battery positive electrode material composed of cerium oxide and carbon co-coated lithium vanadium phosphate and preparation method thereof
  • Lithium ion battery positive electrode material composed of cerium oxide and carbon co-coated lithium vanadium phosphate and preparation method thereof

Examples

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Effect test

Embodiment 1

[0037] Dissolve 4.145g of citric acid in 20mL of deionized water, pour it into a beaker containing 1.803g of vanadium pentoxide, and stir on a magnetic heating stirrer at a constant temperature of 60°C for 30 minutes to form a dark blue solution. Dissolve 3.421 g of ammonium dihydrogen phosphate and 1.121 g of lithium carbonate in 20 mL of deionized water respectively, add them to the above dark blue solution, and stir on a magnetic heating stirrer at a constant temperature of 60°C for 30 minutes. The pH value was adjusted to 4 with acetic acid, and the mixed liquid was stirred at a constant temperature of 60° C. for 1 hour on a magnetic heating stirrer. Raise the temperature to 80°C, continue stirring to evaporate the solvent to form a dark blue wet gel, and put it in an oven at 80°C for 1 day to form a dry gel. The xerogel was ground in a mortar for 30 minutes to form a blue-green powder. Then the blue-green powder is kept at 350° C. for 4 hours under a hydrogen-nitrogen mi...

Embodiment 2

[0041]Dissolve 4.145g of citric acid in 20mL of deionized water, pour it into a beaker containing 1.803g of vanadium pentoxide, and stir on a magnetic heating stirrer at a constant temperature of 60°C for 30 minutes to form a dark blue solution. Dissolve 3.421 g of ammonium dihydrogen phosphate and 1.121 g of lithium carbonate in 20 mL of deionized water respectively, add them to the above dark blue solution, and stir on a magnetic heating stirrer at a constant temperature of 60°C for 30 minutes. The pH value was adjusted to 4 with acetic acid, and the mixed liquid was stirred at a constant temperature of 60° C. for 1 hour on a magnetic heating stirrer. Raise the temperature to 80°C, continue stirring to evaporate the solvent to form a dark blue wet gel, and put it in an oven at 80°C for 1 day to form a dry gel. The xerogel was ground in a mortar for 30 minutes to form a blue-green powder. Then the blue-green powder is kept at 350° C. for 4 hours under a hydrogen-nitrogen mix...

Embodiment 3

[0045] Dissolve 4.145g of citric acid in 20mL of deionized water, pour it into a beaker containing 1.803g of vanadium pentoxide, and stir on a magnetic heating stirrer at a constant temperature of 60°C for 30 minutes to form a dark blue solution. Dissolve 3.421 g of ammonium dihydrogen phosphate and 1.121 g of lithium carbonate in 20 mL of deionized water respectively, add them to the above dark blue solution, and stir on a magnetic heating stirrer at a constant temperature of 60°C for 30 minutes. The pH value was adjusted to 4 with acetic acid, and the mixed liquid was stirred at a constant temperature of 60° C. for 1 hour on a magnetic heating stirrer. Raise the temperature to 80°C, continue stirring to evaporate the solvent to form a dark blue wet gel, and put it in an oven at 80°C for 1 day to form a dry gel. The xerogel was ground in a mortar for 30 minutes to form a blue-green powder. Then the blue-green powder is kept at 350° C. for 4 hours under a hydrogen-nitrogen mi...

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Abstract

The invention discloses a lithium ion battery positive electrode material composed of cerium oxide and carbon co-coated lithium vanadium phosphate and a preparation method thereof. According to the preparation method, vanadium pentoxide, citric acid, ammonium biphosphate and lithium carbonate in a mol ratio of 2: 4: 6: 3 are used as raw materials for preparation of carbon coated lithium vanadium phosphate, cerium nitrate hexahydrate is used as a cerium source, and the content of CeO2 accounts for 0.5 to 10% of the mass of lithium vanadium phosphate. The method prepares CeO2 and carbon coated lithium vanadium phosphate by using a pH value-controlled sol-gel process and a polyvinyl alcohol-assisted suspension mixing process so as to overcome the disadvantage of poor charge and discharge performance of a conventional carbon coated lithium vanadium phosphate positive electrode material at a high rate. The method is a simple and low-cost modification method and prepares the lithium ion battery positive electrode material with excellent electrochemical performance.

Description

technical field [0001] The invention belongs to the technical field of lithium ion battery cathode materials, in particular to a cerium oxide (CeO 2 ) and carbon (C) composite modified lithium vanadium phosphate (Li 3 V 2 (PO 4 ) 3 ) lithium ion battery positive electrode material and preparation method thereof. Background technique [0002] Lithium-ion batteries are widely used in fields such as electric vehicles and hybrid electric vehicles due to their high energy density, good charge-discharge performance, and high safety. At the same time, the new power lithium-ion battery also shows a very broad application prospect in the fields of future power grid peak regulation, solar energy and wind energy storage. [0003] Due to its outstanding advantages, Li transition metal phosphates have received extensive attention, among which lithium iron phosphate (LiFePO 4 ) has done a lot of basic research and applied research, and has already entered the era of large-scale comm...

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M4/62
CPCH01M4/366H01M4/5825H01M4/625H01M10/0525Y02E60/10
Inventor 郭瑞松杨月霞刘兰王珊珊
Owner TIANJIN UNIV
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