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Anion-cation co-doped high-nickel single-crystal ternary positive electrode material as well as preparation method and application thereof

A cathode material, anion and cation technology, applied in the field of anion and cation co-doped high-nickel single crystal ternary cathode material and its preparation field, can solve the problems of poor rate performance, capacity and voltage decay, etc., to reduce sintering temperature, reduce Melting point, the effect of increasing the oxygen vacancy formation energy

Pending Publication Date: 2021-12-07
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The object of the present invention is to provide a high-nickel single crystal ternary positive electrode material co-doped with anions and cations and its preparation method and application. Improve the intrinsic conductivity, thereby alleviating its capacity fading and voltage drop during the cycling process, which can effectively overcome the problems of poor rate performance and serious capacity and voltage fading during the cycling process of existing cathode materials.

Method used

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  • Anion-cation co-doped high-nickel single-crystal ternary positive electrode material as well as preparation method and application thereof
  • Anion-cation co-doped high-nickel single-crystal ternary positive electrode material as well as preparation method and application thereof
  • Anion-cation co-doped high-nickel single-crystal ternary positive electrode material as well as preparation method and application thereof

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Embodiment 1

[0064] The embodiment of the present invention provides a method for preparing a high-nickel single crystal ternary positive electrode material, which specifically includes the following steps:

[0065] S1, add 0.02mol Mn 0.83 Ni 0.11 co 0.06 (HO) 2 , 0.0702mol LiOH·H 2 O, 0.0966mol LiNO 3 and 0.0132mol LiCl are placed in an agate ball mill jar, and mixed for 2h in a dry environment to obtain a raw material mixture;

[0066] S2. Transfer the raw material mixture in S1 to the corundum ark, and then place it in an oxygen atmosphere, first raise the temperature to 500°C at a rate of 3°C / min, keep it warm for 5 hours, and then raise the temperature to 800°C at a rate of 3°C / min And keep it warm for 12 hours, then cool to normal temperature at a rate of 3°C / min to obtain a solid molten material;

[0067] S3. Grind the solid molten material in S2 into powder, stir with deionized water for 30 minutes, then filter and wash with deionized water and absolute ethanol for 3 times, a...

Embodiment 2

[0070] The embodiment of the present invention provides a method for preparing a high-nickel single crystal ternary positive electrode material co-doped with anions and cations, which specifically includes the following steps:

[0071] S1, add 0.02mol Mn 0.83 Ni 0.11 co 0.06 (HO) 2 , 0.000025mol Nb 2 o 5 , 0.0702mol LiOH·H 2 O, 0.0966mol LiNO 3 and 0.0132mol LiCl are placed in an agate ball mill jar, mixed in a dry environment for 2h, to obtain a raw material mixture containing Nb ion dopant;

[0072] S2. Transfer the raw material mixture containing Nb ion dopant in S1 to a corundum ark, and then place it under an oxygen atmosphere, first raise the temperature to 500°C at a rate of 3°C / min and keep it warm for 5h, then heat it up at a rate of 3°C / min. The temperature was raised to 800°C at a speed of 1 min and kept at a temperature of 12 hours, and then cooled to room temperature at a speed of 3°C / min to obtain a solid molten material;

[0073] S3, grind the solid molt...

Embodiment 3

[0078] The embodiment of the present invention provides a method for preparing a high-nickel single crystal ternary positive electrode material co-doped with anions and cations, which specifically includes the following steps:

[0079] S1, add 0.02mol Mn 0.83 Ni 0.11 co 0.06 (HO) 2 , 0.00005mol ZrO 2 , 0.0702mol LiOH·H 2 O, 0.0966mol LiNO 3 and 0.0132mol LiCl are placed in an agate ball mill jar, mixed in a dry environment for 2h, to obtain a raw material mixture containing Zr ion dopant;

[0080] S2. Transfer the raw material mixture containing Zr ion dopant in S1 to the corundum ark, and then place it under an oxygen atmosphere, first raise the temperature to 500°C at a rate of 3°C / min and keep it warm for 5h, then heat it up at a rate of 3°C / min. The temperature was raised to 800°C at a speed of 1 min and kept at a temperature of 12 hours, and then cooled to room temperature at a speed of 3°C / min to obtain a solid molten material;

[0081]S3. Grinding the solid molte...

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Abstract

The invention discloses an anion-cation co-doped high-nickel single-crystal ternary positive electrode material as well as a preparation method and application thereof. The molecular formula of the anion-cation co-doped high-nickel single-crystal ternary positive electrode material is Li1+aNixCoyMnzMaO2-bOb; wherein M is one or more of Mg, Sf, Al, Zr, Nb, Ta, Mo, Ti, Y, W and V; Q is one or more of F, N, P, S and Se; 1 > x > y > = z > 0, x > = 0.5, and x + y + z = 1. The element Q and the element M of the anion and cation co-doped high-nickel single-crystal ternary positive electrode material replace the site of oxygen and the sites of transition metal nickel, cobalt and manganese respectively, so that the capacity fading and the voltage drop of the high-nickel single-crystal ternary positive electrode material in the cycle process can be inhibited, and the cycle stability, the thermal stability and the intrinsic conductivity can be improved; The rate capability is improved, so that the capacity fading and microcracks of the high-nickel ternary positive electrode material in the circulation process can be effectively inhibited.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery materials, and relates to a lithium-ion battery cathode material and a preparation method thereof, more specifically, to an anion-cation co-doped high-nickel single crystal ternary cathode material, a preparation method and application thereof. Background technique [0002] With the development of society and the advancement of science and technology, clean and efficient energy storage and conversion has become a research hotspot in the energy field. [0003] As a new type of secondary power source, lithium-ion batteries have the advantages of high specific energy, no memory effect, long cycle life and low environmental pollution, injecting fresh blood into the vigorous development of energy networks. Lithium-ion electric vehicles are an important part of the new energy vehicle family. As the "heart" of electric vehicles, high-energy-density lithium-ion power batteries can effectively ...

Claims

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Application Information

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IPC IPC(8): H01M4/525H01M4/505H01M4/1391H01M4/04H01M10/0525
CPCH01M4/525H01M4/505H01M4/1391H01M4/0471H01M10/0525H01M2004/028Y02E60/10
Inventor 纪效波倪炼山侯红帅邹国强
Owner CENT SOUTH UNIV
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