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Calcium fluoride coated lithium nickel manganate and preparation method thereof

A technology of lithium nickel manganese oxide and calcium fluoride, which is applied in the field of electrochemistry, can solve problems such as insignificant coating effect, electrolyte corrosion, instability, etc., to improve high-temperature electrochemical cycle performance, improve performance, and prevent deintercalation Effect

Inactive Publication Date: 2018-12-21
SHANGHAI ELECTRICGROUP CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by the present invention is to overcome the defects that the coating materials of lithium nickel manganese oxide in the prior art, such as oxides, are unstable during long-term charging and discharging, easily corroded by electrolyte, and the coating effect is not obvious. And provide a kind of lithium nickel manganese oxide coated with calcium fluoride and preparation method thereof

Method used

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  • Calcium fluoride coated lithium nickel manganate and preparation method thereof
  • Calcium fluoride coated lithium nickel manganate and preparation method thereof
  • Calcium fluoride coated lithium nickel manganate and preparation method thereof

Examples

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Effect test

Embodiment 1

[0041] Such as figure 1 As shown, the preparation process of calcium fluoride-coated lithium nickel manganese oxide material comprises the following steps:

[0042] a) Take 5g of lithium nickel manganese oxide and add it to 250ml of deionized water, and ultrasonically disperse it for 20 minutes to obtain a uniform lithium nickel manganese oxide solution;

[0043] b) Weigh 3.78g of calcium nitrate tetrahydrate and 1.19g of ammonium fluoride according to the chemical molar ratio of 1:2, add them into two 250ml volumetric flasks respectively, and then use deionized water to make up the volume, and wait until the two materials are fully dissolved. A uniform solution of calcium nitrate and ammonium fluoride was obtained.

[0044] c) Take 10ml of calcium nitrate solution and add it to the solution described in step a, and sonicate for 1 hour and stir for 2 hours;

[0045] d) Add 10ml of ammonium fluoride solution dropwise to the solution prepared in step c within 15 minutes, and b...

Embodiment 2

[0048] a) Take 5g of lithium nickel manganese oxide and add it to 250ml of deionized water, and ultrasonically disperse it for 20 minutes to obtain a uniform lithium nickel manganese oxide solution;

[0049] b) Weigh 3.78g of calcium nitrate tetrahydrate and 1.19g of ammonium fluoride according to the chemical molar ratio of 1:2, add them into two 250ml volumetric flasks respectively, and then use deionized water to make up the volume, and wait until the two materials are fully dissolved. A uniform solution of calcium nitrate and ammonium fluoride was obtained.

[0050] c) Take 20ml of calcium nitrate solution and add it to the solution described in step a, and sonicate for 1 hour and stir for 2 hours;

[0051] d) Add 20ml of ammonium fluoride solution dropwise to the solution prepared in step c within 15 minutes, and bathe in water at 80°C for 5 hours;

[0052] e) Centrifuge the above mixed solution and wash it with deionization for 3 times, then dry it at 80°C for 12 hours ...

Embodiment 3

[0054] a) Take 5g of lithium nickel manganese oxide and add it to 250ml of deionized water, and ultrasonically disperse it for 20 minutes to obtain a uniform lithium nickel manganese oxide solution;

[0055] b) Weigh 3.78g of calcium nitrate tetrahydrate and 1.19g of ammonium fluoride according to the chemical molar ratio of 1:2, add them into two 250ml volumetric flasks respectively, and then use deionized water to make up the volume, and wait until the two materials are fully dissolved. A uniform solution of calcium nitrate and ammonium fluoride was obtained.

[0056] c) Take 50ml of calcium nitrate solution and add it to the solution described in step a, and sonicate for 1 hour and stir for 2 hours;

[0057] d) Add 50ml of ammonium fluoride solution dropwise to the solution prepared in step c within 15 minutes, and bathe in water at 80°C for 5 hours;

[0058] e) Centrifuge the above mixed solution and wash it with deionization for 3 times, then dry it at 80°C for 12 hours ...

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Abstract

The invention discloses a calcium fluoride coated lithium nickel manganate and a preparation method thereof. The preparation method comprises the following steps: uniformly mixing the ammonium fluoride solution with a mixed solution of lithium nickel manganate and calcium nitrate; performing Water bath reaction at 60 to 90 degree centigrade for 5 to 10 hours, centrifuging, wahsing, drying, and calcining to obtain calcium fluoride coated lithium nickel manganate; The calcination temperature is 200 to 500 degree centigrade for 2 to 6 hours; In the calcium fluoride coated lithium nickel manganate, the mass ratio of calcium fluoride to lithium nickel manganate is 0.5% to 8%. The calcium fluoride coated lithium nickel manganate prepared by the method has uniform distribution and can remarkablyimprove the high-temperature cycling performance of the lithium nickel manganate material.

Description

technical field [0001] The invention relates to the field of electrochemistry, in particular to calcium fluoride-coated lithium nickel manganese oxide and a preparation method thereof. Background technique [0002] In recent years, with the decrease of fossil energy and the increasingly severe environmental problems, the application of lithium-ion batteries in the field of electric vehicles and energy storage has attracted more and more attention. Lithium-ion batteries are considered to be the most promising electrical energy storage devices because of their higher energy density and power density compared with other types of batteries. However, the energy density and power density of existing lithium-ion batteries are still low, and their safety and cycle life have not yet met the requirements for future applications in electric vehicles and energy storage systems. [0003] The positive electrode material largely determines the main parameters such as the working voltage o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M4/628H01M10/0525Y02E60/10
Inventor 潘光杰刘佳丽李旺周兰万玲玉
Owner SHANGHAI ELECTRICGROUP CORP
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