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Lithium zirconium phosphate fast ion conductor coated and modified lithium cobalt oxide positive electrode material as well as preparation method and application thereof

An ion conductor, lithium zirconium phosphate technology, applied in chemical instruments and methods, cobalt compounds, phosphorus compounds, etc., to achieve excellent rate performance, maintain stability, and reduce volume changes.

Inactive Publication Date: 2022-04-12
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] For example, in the patent application with the publication number CN 101969110 A, lithium cobalt oxide, the positive electrode material of lithium ion battery modified by fast ion conductor, but its charging voltage is limited to 4.4V, and the first capacity is only 166.5mAh / g

Method used

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  • Lithium zirconium phosphate fast ion conductor coated and modified lithium cobalt oxide positive electrode material as well as preparation method and application thereof
  • Lithium zirconium phosphate fast ion conductor coated and modified lithium cobalt oxide positive electrode material as well as preparation method and application thereof
  • Lithium zirconium phosphate fast ion conductor coated and modified lithium cobalt oxide positive electrode material as well as preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0046] A method for preparing a lithium zirconium phosphate fast ion conductor coated modified lithium cobaltate cathode material, specifically comprising the following steps:

[0047] (1) Weigh 0.06894g (0.001mol) lithium nitrate (relative molecular mass 68.94) and transfer to a 250ml reagent bottle, weigh 0.85864g (0.002mol) zirconium nitrate pentahydrate (relative molecular mass 429.32) and transfer to the above reagent In the bottle, continue to weigh 0.34509g (0.003mol) ammonium dihydrogen phosphate (relative molecular mass: 115.03) and transfer it to the above reagent bottle, add 100ml of ethanol to the reagent bottle, and stir slowly until the solid dissolves and forms a milky white suspension. The molar ratio of lithium, zirconium and phosphorus is 1:2:3 (under this condition, 0.5ml solution is the required amount for 0.5wt% coating, 1ml solution is the required amount for 1wt% coating, and the remaining coating amount is based on By analogy, configuring the solution i...

Embodiment 2

[0051] A method for preparing a lithium zirconium phosphate fast ion conductor coated modified lithium cobaltate cathode material, specifically comprising the following steps:

[0052] (1) Weigh 0.06894g (0.001mol) lithium nitrate (relative molecular mass 68.94) and transfer to a 250ml reagent bottle, weigh 0.85864g (0.002mol) zirconium nitrate pentahydrate (relative molecular mass 429.32) and transfer to the above reagent In the bottle, continue to weigh 0.34509g (0.003mol) ammonium dihydrogen phosphate (relative molecular mass: 115.03) and transfer it to the above reagent bottle, add 100ml of ethanol to the reagent bottle, and stir slowly until the solid dissolves and forms a milky white suspension. The molar ratio of lithium, zirconium and phosphorus is 1:2:3.

[0053] (2) Take 1ml of the solution in (1) above with a pipette gun, add 50ml of ethanol, and stir slowly evenly.

[0054] (3) Weigh 0.47431g of lithium cobaltate and add it to the above (2) solution, stir at 80°C ...

Embodiment 3

[0056] A method for preparing a lithium zirconium phosphate fast ion conductor coated modified lithium cobaltate cathode material, specifically comprising the following steps:

[0057] (1) Weigh 0.06894g (0.001mol) lithium nitrate (relative molecular mass 68.94) and transfer to a 250ml reagent bottle, weigh 0.85864g (0.002mol) zirconium nitrate pentahydrate (relative molecular mass 429.32) and transfer to the above reagent In the bottle, continue to weigh 0.34509g (0.003mol) ammonium dihydrogen phosphate (relative molecular mass: 115.03) and transfer it to the above reagent bottle, add 100ml of ethanol to the reagent bottle, and stir slowly until the solid dissolves and forms a milky white suspension. The molar ratio of lithium, zirconium and phosphorus is 1:2:3.

[0058] (2) Take 2ml of the solution in (1) above with a pipette gun, add 50ml of ethanol, and stir slowly evenly.

[0059] (3) Weigh 0.47431g of lithium cobaltate and add it to the above (2) solution, stir at 80°C ...

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Abstract

The invention discloses a lithium cobalt oxide positive electrode material coated and modified by a lithium zirconium phosphate fast ion conductor, and relates to the technical field of lithium ion battery positive electrode materials, the surface of the lithium cobalt oxide positive electrode material is coated with the lithium zirconium phosphate fast ion conductor to form particles, the mass of the lithium zirconium phosphate fast ion conductor is 0.5-5 wt%, the particle size range of the positive electrode material is 6-8 [mu] m, and the particle size range of the lithium zirconium phosphate fast ion conductor is 1-10 [mu] m. The morphology is spheroidic. The invention also provides a preparation method and application of the positive electrode material. The positive electrode material disclosed by the invention has the beneficial effects that the positive electrode material has excellent rate capability and cycling stability at a higher charging voltage of 4.6 V, the first discharge capacity can be up to 217.5 mAh / g at 3.0-4.6 V and 0.1 C, and the capacity retention rate is up to 77.8% after 40 cycles; under 0.5 C, the first discharge capacity can reach 214.9 mAh / g, and after 100 cycles, the capacity retention rate can reach 75.1%.

Description

technical field [0001] The invention relates to the technical field of positive electrode materials for lithium ion batteries, in particular to a lithium cobaltate positive electrode material coated and modified by a zirconium phosphate lithium fast ion conductor and a preparation method and application thereof. Background technique [0002] Lithium-ion batteries are widely used in cell phones, laptops, and electric vehicles because they are lightweight, rechargeable, and have high energy density. They can also be used to store energy sources such as solar and wind power, enabling the withdrawal of fossil fuels from modern society. The cathode material is one of the main factors limiting the specific capacity and energy density of lithium-ion batteries. Lithium cobalt oxide is one of the main cathode materials, which has the advantages of high discharge platform, large specific capacity, high energy density, and simple synthesis process. However, the charging voltage of tr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/36H01M4/525H01M10/0525C01B25/45C01G51/00
Inventor 丁锦文张晓磊章根强
Owner UNIV OF SCI & TECH OF CHINA