Carbon-coated high-capacity lithium-rich manganese ternary cathode material with MOF as carbon source and preparation method thereof

A lithium-rich manganese-based ternary and cathode material technology, applied in the field of lithium-ion batteries, can solve the problem of high capacity loss, achieve high capacity retention rate and improve cycle performance.

Active Publication Date: 2019-05-10
SHANGHAI SECOND POLYTECHNIC UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, ternary cathode materials with layered structure have higher theoretical capacity and higher discharge platform and become better research objects, but their capacity loss is relatively high.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Weigh lithium hydroxide monohydrate and dissolve it in 35 ml deionized water, the concentration is 4M. Stir to dissolve, and heat appropriately to increase the saturation of the solution to obtain solution A;

[0028] (2) Weigh manganese sulfate monohydrate, nickel sulfate hexahydrate, cobalt sulfate heptahydrate, and ammonium persulfate and dissolve them in 15ml deionized water (feeding of manganese sulfate monohydrate, nickel sulfate hexahydrate, cobalt sulfate heptahydrate and ammonium persulfate 0.54mol, 0.13mol, 0.13mol, 0.8mol), magnetically stirred for 1h to obtain solution B;

[0029] (3) Use a separatory funnel to drop solution A into solution B (1 drop / second), and stir magnetically for 30 minutes to obtain chelation solution C;

[0030] (4) Put the C solution into a 100ml reactor, and conduct a hydrothermal reaction at 220°C for 24 hours to obtain three hydrothermal reaction products; take it out after cooling, pour it into a Buchner funnel, and use a ci...

Embodiment 2

[0036] (1) Weigh lithium hydroxide monohydrate and dissolve it in 35 ml deionized water, the concentration is 6M. Stir to dissolve, and heat appropriately to increase the saturation of the solution to obtain solution A;

[0037] (2) Weigh manganese sulfate monohydrate, nickel sulfate hexahydrate, cobalt sulfate heptahydrate, and ammonium persulfate and dissolve them in 15ml deionized water (feeding of manganese sulfate monohydrate, nickel sulfate hexahydrate, cobalt sulfate heptahydrate and ammonium persulfate 0.54mol, 0.13mol, 0.13mol, 0.8mol), magnetically stirred for 1h to obtain solution B;

[0038] (3) Use a separatory funnel to drop solution A into solution B (1 drop / second), and stir magnetically for 30 minutes to obtain chelation solution C;

[0039] (4) Put the C solution into a 100ml reactor, and conduct a hydrothermal reaction at 180°C for 36 hours to obtain three hydrothermal reaction products; take it out after cooling, pour it into a Buchner funnel, and use a ci...

Embodiment 3

[0044] (1) Weigh lithium hydroxide monohydrate and dissolve it in 35 ml deionized water, the concentration is 5M. Stir to dissolve, and heat appropriately to increase the saturation of the solution to obtain solution A;

[0045] (2) Weigh manganese sulfate monohydrate, nickel sulfate hexahydrate, cobalt sulfate heptahydrate, and ammonium persulfate and dissolve them in 15ml deionized water (feeding of manganese sulfate monohydrate, nickel sulfate hexahydrate, cobalt sulfate heptahydrate and ammonium persulfate 0.54mol, 0.13mol, 0.13mol, 0.8mol), magnetically stirred for 1h to obtain solution B;

[0046] (3) Use a separatory funnel to drop solution A into solution B (1 drop / second), and stir magnetically for 30 minutes to obtain chelation solution C;

[0047] (4) Put the C solution into a 100ml reactor, and conduct a hydrothermal reaction at 180°C for 72 hours to obtain three hydrothermal reaction products; take it out after cooling, pour it into a Buchner funnel, and use a ci...

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PUM

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Abstract

The invention discloses a carbon-coated high-capacity lithium-rich manganese ternary cathode material with an MOF as a carbon source and a preparation method thereof. The preparation method comprisesthe following specific steps that (1) a solution containing lithium is added to a mixture solution containing manganese salts, nickel salts, cobalt salts, and ammonium persulfate, after stirring and mixing, hydrothermal reaction is conducted in a hydrothermal kettle, and after the hydrothermal reaction, a ternary lithium-rich manganese material is obtained by suction filtration, washing and drying; and (2) the ternary lithium-rich manganese material and the carbon source with a metal organic framework compound (MOF) as the main component are mixed and ball-milled through ball milling, after the ball milling, drying is conducted, obtained samples are heat-treated, and the carbon-coated high-capacity lithium-rich manganese ternary cathode material with the MOF as the carbon source is obtained. According to the carbon-coated high-capacity lithium-rich manganese ternary cathode material with the MOF as the carbon source, first discharge capacity is high, and cycle performance is good.

Description

technical field [0001] The invention relates to a carbon-coated high-capacity lithium-rich manganese-based ternary positive electrode material with MOF as a carbon source and a preparation method, belonging to the technical field of lithium-ion batteries. Background technique [0002] With the development of society, people pay more and more attention to portable energy storage devices with high energy density, high cycle performance and high safety, especially in the field of aerospace, transportation and military. In recent years, with the aggravation of environmental pollution and energy shortage, traditional energy vehicles are gradually withdrawing from the stage of history, followed by the continuous development of rechargeable new energy vehicles, but it also brings a series of problems, such as insufficient mileage and poor service life , long charging time and safety issues. [0003] The automotive field is the fundamental driving force for the development of porta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/583H01M10/0525
CPCY02E60/10
Inventor 黎阳朱宽王亚丽谢华清
Owner SHANGHAI SECOND POLYTECHNIC UNIVERSITY
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