Modification method of high-nickel ternary anode material of lithium ion battery

A high-nickel ternary material, lithium-ion battery technology, applied in battery electrodes, positive electrodes, electrical components, etc., can solve problems such as complex methods, and achieve the effects of reducing breakage, reducing cracks, and improving cycle stability

Inactive Publication Date: 2020-07-31
SUZHOU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Although the above-mentioned modification method has improved the electrochemical performance or structure of the high-nickel ternary material, the common co-precipitation method is used for element doping or simple inert material physical coating on the ternary material microspheres. The methods involved Complicated, especially failure to design doping or cladding technology solutions to achieve crystal microstructure control of materials

Method used

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  • Modification method of high-nickel ternary anode material of lithium ion battery
  • Modification method of high-nickel ternary anode material of lithium ion battery
  • Modification method of high-nickel ternary anode material of lithium ion battery

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Effect test

Embodiment 1

[0040] (1) Commercialized LiNi 0.8 co 0.15 al 0.05 o 2 The precursor and lithium hydroxide were mixed and ground at a molar ratio of 1:1.05, and sintered in a muffle furnace from room temperature to 480 °C in an air atmosphere for 5 hours at a heating rate of 5 °C / min to obtain a lithiated precursor of NCA.

[0041] (2) Mix and dissolve a certain amount of manganese acetate, lithium hydroxide and citric acid into an appropriate amount of deionized water, stir for 30 minutes to dissolve completely, wherein the molar ratio of manganese acetate, lithium hydroxide and anhydrous citric acid is 1:1 :1. The resulting 20g mixed solution (0.3g of manganese acetate) was heated to 80°C, and then 2.05g of the lithiated precursor of NCA obtained in step (1) was added to it to obtain a precursor of coated nanoparticles Li-Mn-O , wherein, Mn is 3mol% of NCA, continue to stir for 5 hours and evaporate to dryness.

[0042] (3) Sinter the precursor of coated nanoparticle Li-Mn-O in a tube ...

Embodiment 2

[0045] (1) Commercialized LiNi 0.8 co 0.15 al 0.05 o 2 The precursor and lithium hydroxide were mixed and ground at a molar ratio of 1:1.03, and then sintered in a muffle furnace from room temperature to 480°C for 5 hours in an air atmosphere at a heating rate of 5°C / min to obtain LiNi 0.8 co 0.15 al 0.05 o 2 Lithiated precursors.

[0046] (2) Mix and dissolve a certain amount of manganese acetate, lithium hydroxide and citric acid into an appropriate amount of deionized water, stir for 30 minutes to dissolve completely, wherein the molar ratio of manganese acetate, lithium hydroxide and anhydrous citric acid is 2:2 :1. The resulting 20g mixed solution (0.41g of manganese acetate) was heated to 80°C, and then 2.02g of the LiNi obtained in step (1) was added thereto 0.8 co 0.15 al 0.05 o 2 The precursor was lithiated to obtain a precursor coated with Li-Mn-O nanoparticles, wherein Mn was 5 mol% of NCA, and the stirring was continued for 6 hours to evaporate the water...

Embodiment 3

[0051] (1) Commercialized LiNi 0.8 co 0.15 al 0.05 o 2 The precursor and lithium hydroxide were mixed and ground at a molar ratio of 1:1.05, and then sintered in a muffle furnace from room temperature to 480°C for 5 hours in an air atmosphere at a heating rate of 5°C / min to obtain LiNi 0.8 co 0.15 al 0.05 o 2 lithiated precursors.

[0052] (2) Mix and dissolve a certain amount of manganese acetate, lithium hydroxide and citric acid into an appropriate amount of deionized water, stir for 30 minutes to dissolve completely, wherein the molar ratio of manganese acetate, lithium hydroxide and citric acid is 1:1:1 , add ammonia water dropwise, the obtained mixed solution of 20g (1.01g of manganese acetate) is heated to 80°C, and then 1.96g of LiNi obtained in step (1) is added thereto 0.8 co 0.15 al 0.05 o 2 The lithiated precursor was obtained to obtain a precursor coated with nanoparticles Li-Mn-O, wherein Mn was 10 mol% of NCA, and the stirring was continued for 8 hours...

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Abstract

The invention discloses a modification method of a high-nickel ternary anode material of a lithium ion battery. The method comprises the following steps: a, mixing an original precursor of the high-nickel ternary material with a lithium source, and presintering to prepare a lithiated precursor; b, preparing manganese / aluminum oxide nanoparticles by using a sol-gel method; c, uniformly coating thesurface of the lithiation precursor of the high-nickel ternary material with manganese / aluminum oxide nanoparticles; and d, preparing the manganese / aluminum element doped high-nickel ternary materialthrough high-temperature calcination. According to the lithiation precursor route provided by the invention, the breakage of the precursor in the nanoparticle coating process can be greatly reduced, and the uniform coating of the manganese / aluminum oxide nanoparticles on the lithiation precursor is realized. By regulating and controlling the crystal microstructure of the manganese / aluminum doped high-nickel ternary material, cracks of the ternary material microspheres in the charge-discharge cycle process of the battery can be greatly reduced, so that the high-nickel ternary material shows excellent cycle stability.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery cathode materials, in particular to a crystal growth control method for lithium-ion battery cathode materials and a microscopic crystal structure regulation method thereof. Background technique [0002] With the increasingly serious problems of environmental pollution and energy crisis, it is imperative to develop a green and pollution-free new energy source. In recent years, ternary cathode materials for lithium-ion batteries have attracted widespread attention due to their advantages of high energy, good cycle performance and low cost. Among them, the lithium-ion battery ternary material NCM (LiNi x co y mn z o 2 ) / NCA(LiNi x co y Al z o 2 ) is a positive electrode material with great development prospects. Lithium-ion battery ternary material NCM / NCA and traditional LiCoO 2 , LiNiO 2 and LiMnO 2 / LiAlO 2 Compared with it, it has great advantages, such as low cost, high e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/525H01M4/505H01M10/0525
CPCH01M4/505H01M4/525H01M10/0525H01M2004/028Y02E60/10
Inventor 郑军伟杜芳惠
Owner SUZHOU UNIV
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