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K ion-doped and high-voltage spinel/carbon double-layer coated lithium-rich anode material and preparation method thereof

A lithium-rich positive electrode material, ion doping technology, applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problems of high sintering temperature, limited conductivity of pyrolytic carbon, difficult to control the degree of carbonization of dopamine, etc., to increase electron- Effects of lithium ion conductance, improved electrochemical performance, and fast three-dimensional lithium ion conduction characteristics

Active Publication Date: 2017-01-04
CHANGSHA RES INST OF MINING & METALLURGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a lithium-rich cathode material doped with K ions and coated with high-voltage spinel / carbon double layers and a preparation method thereof, so as to solve the problem that the existing sintering temperature is relatively high, and the degree of carbonization of dopamine is difficult to control. And technical problems such as limited electrical conductivity of pyrolytic carbon

Method used

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  • K ion-doped and high-voltage spinel/carbon double-layer coated lithium-rich anode material and preparation method thereof
  • K ion-doped and high-voltage spinel/carbon double-layer coated lithium-rich anode material and preparation method thereof
  • K ion-doped and high-voltage spinel/carbon double-layer coated lithium-rich anode material and preparation method thereof

Examples

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Effect test

Embodiment 1

[0035] K + Doping and synergistic coating composite modification of dopamine polymer and graphene applied to lithium-rich manganese-based ternary cathode material Li 1.2 mn 0.54 Ni 0.13 co 0.13 o 2 , prepared by the following steps:

[0036] (1) Take K + The number of moles is about Li + Add 1% nitrate by mole to the above-mentioned stoichiometric lithium, nickel, cobalt and manganese nitrate solution, add an appropriate amount of citric acid as a complexing agent, and spray dry it after it is dissolved and stirred evenly to obtain a precursor powder ;

[0037] (2) Sinter the above precursor powder at 950 °C for 10 h to obtain K + Doped modified lithium-rich ternary cathode material powder as the nucleus;

[0038] (3) Take 1g of the above K + The doped modified lithium-rich cathode material powder was added to 100ml of 10mmol / LTris-HCL buffer solution (PH=8.5) and ultrasonically stirred for 1h. Then add 0.3 g of dopamine hydrochloride and continue stirring for 6 hou...

Embodiment 2

[0043] K + Doping and synergistic coating composite modification of dopamine polymer and graphene applied to lithium-rich manganese-based cathode materials Li 1.2 mn 0.6 Ni 0.2 o 2 , prepared by the following steps:

[0044] (1) Take K + The number of moles is about Li + Add 0.5% nitrate by mole to the above-mentioned stoichiometric lithium, nickel, cobalt and manganese nitrate solution, add an appropriate amount of citric acid as a complexing agent, and spray dry it after it is dissolved and stirred evenly to obtain a precursor powder ;

[0045] (2) Sinter the above precursor powder at 950 °C for 10 h to obtain K + Doped modified lithium-rich cathode materials;

[0046] (3) Take 1g of the above K + The doped modified lithium-rich cathode material powder was added to 100ml of 10mmol / LTris-HCL buffer solution (PH=8.0) and ultrasonically stirred for 1h. Then add 0.3 g of dopamine hydrochloride and continue stirring for 10 h, filter and dry to obtain a lithium-rich posi...

Embodiment 3

[0050] K + Doping and synergistic coating composite modification of dopamine polymer and graphene applied to lithium-rich manganese-based cathode materials Li 1.2 mn 1.5 Ni 0.5 o 2 , prepared by the following steps:

[0051] (1) Take K + The number of moles is about Li + Add 0.8% nitrate by mole to the above-mentioned stoichiometric lithium, nickel, cobalt and manganese nitrate solution, add an appropriate amount of citric acid as a complexing agent, and spray dry it after it is dissolved and stirred evenly to obtain a precursor powder ;

[0052] (2) Sinter the above precursor powder at 950 °C for 10 h to obtain K + Doped modified lithium-rich ternary cathode material;

[0053] (3) Take 1g of the above K + The doped modified lithium-rich cathode material powder was added to 100ml of 10mmol / LTris-HCL buffer solution (PH=8.3) and ultrasonically stirred for 1h. Then add 0.3 g of dopamine hydrochloride and continue stirring for 8 hours, filter and dry to obtain a lithium...

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Abstract

The invention discloses a K ion-doped and high-voltage spinel / carbon double-layer coated lithium-rich anode material and a preparation method thereof. The lithium-rich anode material comprises a K ion-doped modified core and a high-voltage spinel / carbon double coating layers, wherein the surface of the core is coated with the high-voltage spinel / carbon double coating layers, the core is Li1.2-xKxMn0.6-yNi0.2-yCo2YO2, x is equal to 0.00-0.1, and y is equal to 0.00-0.05; the component of the high-voltage spinel layer in the high-voltage spinel / carbon double coating layers is Li1-xKxMn1.5-yNi0.5-yCo2yO4, x is equal to 0.0-0.2, and y is equal to 0.0-0.1; the carbon coating layer is of a composite structure of dopamine polymer pyrolytic carbon and reduced graphene oxide. The preparation method includes the steps that through a spraying drying technology, the K ion-doped modified core is prepared, the surface of the core is coated with dopamine polymer, coating of graphene oxide is carried out on the basis, and through follow-up sintering, the K ion-doped and high-voltage spinel / carbon double-layer coated lithium-rich anode material is prepared. A modification step is easy to control, and the electrochemical performance of the lithium-rich anode material can be obviously improved.

Description

technical field [0001] The invention relates to the technical field of modification of positive electrode materials for lithium ion batteries, in particular to a lithium-rich positive electrode material with K ion doping and high-voltage spinel / carbon double-layer coating, a preparation method thereof, a lithium battery positive electrode and a lithium battery. Background technique [0002] Energy and environmental crisis have become two very important issues plaguing today's society, so higher requirements are put forward for the development of high-performance energy storage and conversion devices. As a secondary battery, lithium-ion batteries have the advantages of high specific energy / power density, long cycle life, no memory effect, no pollution and good safety performance, and have been widely used in small electronic devices. New market demands require next-generation LIB (lithium-ion battery) technology to have higher energy / power density, better cycle stability, and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525H01M4/36H01M10/0525H01M4/131
CPCH01M4/131H01M4/366H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 庞胜利王永刚沈湘黔徐凯杰王文智习小明廖达前黄承焕
Owner CHANGSHA RES INST OF MINING & METALLURGY
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