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A surface manganese doping and li-mn-po 4 Coated high-nickel positive electrode material and its preparation method and application

A cathode material, high-nickel technology, applied in battery electrodes, structural parts, electrical components, etc., can solve the problems of poor cycle performance and storage performance, accelerate the dissolution of transition metal ions, etc., to achieve a stable interface, a simple synthesis method, and improved Effects of Cyclic Stability

Active Publication Date: 2022-02-01
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The presence of HF also accelerates the dissolution of transition metal ions in the electrolyte solution, which deteriorates the cycle performance and storage performance of the material.

Method used

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  • A surface manganese doping and li-mn-po <sub>4</sub> Coated high-nickel positive electrode material and its preparation method and application
  • A surface manganese doping and li-mn-po <sub>4</sub> Coated high-nickel positive electrode material and its preparation method and application
  • A surface manganese doping and li-mn-po <sub>4</sub> Coated high-nickel positive electrode material and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] First, 0.0207g of Mn(CH 3 COO) 2 4H 2 O, 0.0074g of (NH 4 ) 2 HPO 4 Add to a beaker filled with 40mL of distilled water, stir for 30 minutes, then add 2g of Ni 0.9 co 0.1 (OH) 2 , stirred at room temperature for 5 hours, evaporated to dryness at 80° C., and then dried in a vacuum oven at 80° C. for 12 hours to obtain a modified precursor material. Lithium hydroxide (LiOH·H 2 O) Add it into the mortar, then add alcohol to grind, and then add the obtained modified precursor material into the mortar, in which LiOH·H 2 O and Ni 0.9 co 0.1 (OH) 2 ) in a molar ratio of 1.02:1, continue to grind until the alcohol evaporates to dryness, and finally obtain a solid powder. The solid powder is calcined in an oxygen atmosphere. First, it is pre-calcined at 500°C for 5 hours, and then it is heated to 720°C for 15 hours. min, the modified high-nickel ternary cathode material was obtained. The obtained modified high-nickel ternary cathode material is designated as 1-MP-N...

Embodiment 2

[0061] 0.0415g of Mn(CH 3 COO) 2 4H 2 O, 0.0149g of (NH 4 ) 2 HPO 4 Add to a beaker filled with 40mL of distilled water, stir for 30 minutes, then add 2g of Ni 0.9 co 0.1 (OH) 2 , stirred at room temperature for 5 hours, evaporated to dryness at 80° C., and then dried in a vacuum oven at 80° C. for 12 hours to obtain a modified precursor material. Lithium hydroxide (LiOH·H 2 O) Add it into the mortar, then add alcohol to grind, and then add the obtained modified precursor material into the mortar, in which LiOH·H 2 O and Ni 0.9 co 0.1 (OH) 2 ) in a molar ratio of 1.02:1, continue to grind until the alcohol evaporates to dryness, and finally obtain a solid powder. The solid powder is calcined in an oxygen atmosphere. First, it is pre-calcined at 500°C for 5 hours, and then it is heated to 720°C for 15 hours. min, the modified high-nickel ternary cathode material was obtained. The obtained modified high-nickel ternary cathode material is designated as 2-MP-NC91.

...

Embodiment 3

[0066] 0.0622g of Mn(CH 3 COO) 2 4H 2 O, 0.0223g of (NH 4 ) 2 HPO 4 Add to a beaker filled with 40mL of distilled water, stir for 30 minutes, then add 2g of Ni 0.9 co 0.1 (OH) 2 , stirred at room temperature for 5 hours, evaporated to dryness at 80° C., and then dried in a vacuum oven at 80° C. for 12 hours to obtain a modified precursor material. Lithium hydroxide (LiOH·H 2 O) Add it into the mortar, then add alcohol for grinding, and then add the prepared modified precursor material, in which LiOH·H 2 O and Ni 0.9 co 0.1 (OH) 2 ) in a molar ratio of 1.02:1, ground until the alcohol was evaporated to dryness, and finally obtained a solid powder. The solid powder is calcined in an oxygen atmosphere. First, it is pre-calcined at 500°C for 5 hours, and then it is heated to 720°C for 15 hours. min, the modified high-nickel ternary cathode material was obtained. The obtained modified high-nickel ternary cathode material is designated as 3-MP-NC91.

[0067] From fig...

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Abstract

The invention discloses a surface manganese doping and Li-Mn-PO 4 Coated high-nickel positive electrode material and its preparation method and application. The material comprises a base material and Li-Mn-PO located on the surface layer of the base material 4 cladding layer; wherein, the base material is a high-nickel positive electrode material doped with manganese ions on the surface, and the chemical formula is LiNi x m y o 2 , where 0.6≤x<1, 0 <y≤0.4，且x+y＝1。制备时将醋酸锰、磷酸二氢铵与前驱体混合，之后再混锂煅烧，一步得到锰离子表面掺杂及li‑mn‑po4 Surface-coated high-nickel cathode material. The synergistic effect of surface coating and doping stabilizes the material structure, removes the residual lithium on the material surface, stabilizes the electrode-electrolyte interface, and thus improves the electrochemical performance of the material. The method introduced by the invention is simple and easy to implement, and can be applied on a large scale in industrialization.< / y≤0.4，且x+y＝1。制备时将醋酸锰、磷酸二氢铵与前驱体混合，之后再混锂煅烧，一步得到锰离子表面掺杂及li‑mn‑po

Description

technical field [0001] The invention relates to a surface manganese doping and Li-Mn-PO 4 The invention relates to a coated high-nickel positive electrode material and a preparation method and application thereof, belonging to the field of chemical energy storage batteries. Background technique [0002] With the continuous aggravation of environmental pollution and energy crisis, the development and use of new pollution-free energy materials has become a research hotspot. Lithium-ion batteries have been widely used in electric vehicles, hybrid vehicles and portable devices due to their high energy density, long cycle life, no memory effect and low pollution. Among the currently commercialized lithium-ion secondary battery cathode materials, the high-nickel layered material LiNi 1-x m x o 2 (0<x≤0.4) has gradually occupied an important position in the lithium-ion battery market due to its high specific capacity, high energy density, and environmental friendliness. [...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/505H01M4/58H01M10/0525
CPCH01M4/366H01M4/485H01M4/505H01M4/5825H01M10/0525Y02E60/10
Inventor 王敬李丹华谭国强苏越锋陈实吴锋
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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