Coated Al and F co-doped single crystal lithium manganate positive electrode material as well as preparation method and application thereof

A single-crystal lithium manganate and cathode material technology, applied in battery electrodes, structural parts, electrical components, etc., can solve problems affecting the performance of material capacity, improve normal temperature cycle performance and rate discharge performance, suppress lattice distortion, The effect of reducing lattice distortion

Pending Publication Date: 2022-07-22
安徽格派新能源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the actual application process, the cycle performance, high temperature performance, and rate discharge performance of lithium manganate need to be further improved, otherwise the capacity of the material will be affected.

Method used

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  • Coated Al and F co-doped single crystal lithium manganate positive electrode material as well as preparation method and application thereof
  • Coated Al and F co-doped single crystal lithium manganate positive electrode material as well as preparation method and application thereof
  • Coated Al and F co-doped single crystal lithium manganate positive electrode material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] This embodiment provides a clad Al, F co-doped single crystal lithium manganate, and the general chemical formula of the single crystal lithium manganate is [Li 1.03 Al 0.01 Mn 1.99 (O 3.995 F 0.01 )]·[Nb 2 O 5 ] 0.01 , the single crystal lithium manganate includes a lithium manganate inner core Li 1.03 Al 0.01 Mn 1.99 (O 3.995 F 0.01 ) and Nb 2 O 5 cladding.

[0034] This embodiment also provides a method for preparing the above-mentioned single crystal lithium manganate positive electrode material, and the preparation method includes the following steps:

[0035] (1) According to the molar ratio of Al:Mn:F=0.02:1.98:0.01, weigh β-MnO 2 , Al(OH) 3 and LiF, using deionized water as solvent and PEG2000 as emulsifier, mixed and ball-milled in a planetary ball mill for 6 h to make a uniform slurry;

[0036] (2) Granulate by spray dryer, control the solid-liquid ratio to be 1:1.2, the air outlet temperature to be 120 °C, the feed rate to be 20 mL / min, and th...

Embodiment 2

[0042] This embodiment provides a method for preparing the above-mentioned single crystal lithium manganate positive electrode material, and the preparation method includes the following steps:

[0043] (1) According to the molar ratio of Al:Mn:F=0.01:1.99:0.01, weigh β-MnO 2 , Al(OH) 3 and LiF, using deionized water as solvent and PEG4000 as emulsifier, mixed and ball-milled in a planetary ball mill for 6 h to make a uniform slurry;

[0044] (2) Granulate by spray dryer, control the solid-liquid ratio to be 1:1.2, the air outlet temperature to be 120 °C, the feed rate to be 20 mL / min, and then dry at 120 °C;

[0045] (3) Sintering at 500 ℃ for 9 h in air atmosphere, cooling, pulverizing and sieving to obtain doped β-MnO 2 ;

[0046] (4) According to the molar ratio Li:Mn:La=1.02:1.99:0.02, weigh Li 2 O, doped β-MnO 2 and coating agent La 2 O 3 , high-energy ball milling for 3 h to obtain lithium manganate precursor;

[0047] (5) Sintering at a high temperature of 780 ...

Embodiment 3

[0050] This embodiment provides a method for preparing the above-mentioned single crystal lithium manganate positive electrode material, and the preparation method includes the following steps:

[0051] (1) According to the molar ratio of Al:Mn:F=0.01:1.99:0.01, weigh β-MnO 2 , Al(OH) 3 and LiF, using deionized water as solvent and PPG as emulsifier, mixed and ball-milled in a planetary ball mill for 6 h to make a uniform slurry;

[0052] (2) Granulate by spray dryer, control the solid-liquid ratio to be 1:1.2, the air outlet temperature to be 120 °C, the feed rate to be 20 mL / min, and then dry at 120 °C;

[0053] (3) Sintering at 500 ℃ for 12 h in air atmosphere, cooling, pulverizing and sieving to obtain doped β-MnO 2 ;

[0054] (4) According to the molar ratio Li:Mn:Zr=1.02:1.99:0.02, weigh LiOH, doped β-MnO 2 and coating agent ZrO 2 , high-energy ball milling for 3 h to obtain lithium manganate precursor;

[0055] (5) Sintering at a high temperature of 750 °C for 24 ...

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Abstract

The invention relates to a coated Al and F co-doped single crystal lithium manganate positive electrode material as well as a preparation method and application thereof, and belongs to the technical field of preparation of battery positive electrode materials. The preparation method comprises the following steps: introducing doping elements Al and F into beta-MnO2 in a planetary ball milling manner, sintering to generate doped beta-MnO2, mixing the doped beta-MnO2, a lithium source and a coating agent, and carrying out secondary sintering to obtain the single-crystal lithium manganate positive electrode material. The lithium manganate is doped and coated by adopting specific elements, so that the crystal structure of the lithium manganate positive electrode material can be stabilized, the dissolution of Mn and the side reaction between an active substance and an electrolyte are inhibited, and the specific capacity, the first charge performance and the cycle performance of the single-crystal lithium manganate are improved.

Description

technical field [0001] The invention belongs to the technical field of battery materials, and in particular relates to a coated Al, F co-doped single crystal lithium manganate positive electrode material and a preparation method and application thereof. Background technique [0002] Lithium-ion batteries are widely used in portable electronic devices due to their high voltage, high energy density, and long cycle life. With the development of emerging industries such as new-generation information technology, new energy, energy conservation and environmental protection, and digital creativity, lithium-ion batteries are transforming into electric vehicles and large-scale energy storage. The safety and manufacturing costs of batteries are the focus of attention in these areas. . [0003] The cathode material is the core and key material of lithium-ion batteries. Lithium manganate has the advantages of abundant reserves, low material cost and high safety, and is one of the most...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/62H01M10/0525
CPCH01M4/366H01M4/505H01M4/62H01M10/0525H01M2004/028
Inventor 许泽辉曹栋强龚丽锋郝晶淼杨玉婷
Owner 安徽格派新能源有限公司
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