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Lithium tungstate-coated Ni-Co lithium aluminate composite material and preparation method and application thereof

A nickel-cobalt lithium aluminate and composite material technology, applied in electrical components, electrochemical generators, battery electrodes, etc., can solve problems such as obstacles, reduced material capacity and cycle performance, and unfavorable lithium ion transmission, achieving continuous and simple process , uniform composition and low cost

Inactive Publication Date: 2018-09-28
CENT SOUTH UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Washing with water will greatly reduce the capacity and cycle performance of the material, and when the material is coated with oxides, fluorides, and phosphates, these coatings do not contain lithium ions, which will hinder the lithium ion deintercalation process, which is not conducive to transport of lithium ions

Method used

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  • Lithium tungstate-coated Ni-Co lithium aluminate composite material and preparation method and application thereof
  • Lithium tungstate-coated Ni-Co lithium aluminate composite material and preparation method and application thereof
  • Lithium tungstate-coated Ni-Co lithium aluminate composite material and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Add 100 g of nickel-cobalt-aluminum precursor to 1 L of lithium hydroxide solution with a concentration of 1 mol / L, stir and mix at a low speed to obtain liquid A, and then add tungsten trioxide with 1% of the mass of the nickel-cobalt-aluminum precursor to obtain slurry B; Evaporate and crystallize the slurry B at 90°C until the slurry is dry, then mix the obtained crystallized product with lithium, and mix it with lithium hydroxide. In the lithium mixed material, the molar ratio of Li:(Ni+Co+Al) is 1.05, Then sinter the lithium-mixed material in oxygen at 750°C for 15 hours to obtain LiNi 0.8 co 0.15 al 0.05 o 2 @Li 2 WO 4 composite material.

[0045] Li in this example 2 WO 4 clad in LiNi 0.8 co 0.15 al 0.05 o 2 @Li 2 WO 4 The mass fraction of composite material is 1%.

[0046] Adopt the LiNi that present embodiment obtains 0.8 co 0.15 al 0.05 o 2 @Li 2 WO 4 The cycle performance at 0.2C (1C=180mAh / g) current density is as follows figure 1 , the ...

Embodiment 2

[0050] Add 200 g of nickel-cobalt-aluminum precursor to 1 L of lithium hydroxide solution with a concentration of 1 mol / L, stir and mix at a low speed to obtain liquid A, and then add tungsten trioxide with 2% of the mass of the nickel-cobalt-aluminum precursor to obtain slurry B; Evaporate and crystallize the slurry B at 100°C until the slurry is dry, then mix the obtained crystallized product with lithium, and mix it with lithium hydroxide. In the lithium mixed material, the molar ratio of Li:(Ni+Co+Al) is 1.01, and then Sinter the lithium-mixed material in oxygen at 700°C for 15 hours to obtain LiNi 0.8 co 0.15 al 0.05 o 2 @Li 2 WO 4 composite material.

[0051] Li in this example 2 WO 4 clad in LiNi 0.8 co 0.15 al 0.05 o 2 @Li 2 WO 4 The mass fraction of composite material is 2%.

[0052] Adopt the LiNi that present embodiment obtains 0.8 co 0.15 al 0.05 o 2 @Li 2 WO 4 The cycle performance at 0.2C (1C=180mAh / g) current density is as follows figure 1 ,...

Embodiment 3

[0056] Add 100 g of nickel-cobalt-aluminum precursor to 1 L of lithium carbonate solution with a concentration of 0.2 mol / L, stir and mix at a low speed to obtain liquid A, and then add tungsten trioxide with 1% of the mass of the nickel-cobalt-aluminum precursor to obtain slurry B; Evaporate and crystallize the slurry B at 80°C until the slurry is dry, then mix the obtained crystallized product with lithium, and mix it with lithium hydroxide. In the lithium mixed material, the molar ratio of Li:(Ni+Co+Al) is 1.03, and then Sinter the lithium-mixed material in oxygen at 800°C for 15 hours to obtain LiNi 0.8 co 0.15 al 0.05 o 2 @Li 2 WO 4 composite material.

[0057] Li in this example 2 WO 4 clad in LiNi 0.8 co 0.15 al 0.05 o 2 @Li 2 WO 4 The mass fraction of composite material is 1%.

[0058] Adopt the LiNi that present embodiment obtains 0.8 co 0.15 al 0.05 o 2 The cycle performance at 0.2C (1C=180mAh / g) current density is as follows figure 1 , the rate pe...

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Abstract

The invention discloses a lithium tungstate-coated Ni-Co lithium aluminate composite material and a preparation method and an application thereof. According to the invention, a nickel-cobalt-aluminumprecursor is dispersed in a lithium-containing solution, cobalt trioxide is added, the lithium-containing solution and cobalt trioxide are subjected to a reaction to generate Li2WO4, during an evaporative crystallization process, Li2WO4 is subjected to direct deposition coating on the nickel-cobalt-aluminum precursor, and lithium-mixing sintering is carried out to obtain LiNi0.8Co0.15Al0.05O2 coated Li2WO4, and through the in-situ reaction, the formed deposited coating can form an uniform coating layer. through crystallization and deposited coating, the obtained coating layer has the advantages of good crystallinity and uniform component, and can be used in a lithium ion battery as a ternary cathode material, the circularity of the obtained lithium ion battery is stable, and the multiplying power performance is excellent.

Description

technical field [0001] The invention relates to a lithium tungstate-coated nickel-cobalt-lithium-aluminate composite material and a preparation method and application thereof, belonging to the field of lithium-ion battery materials. Background technique [0002] At present, lithium-ion batteries have been widely used in various portable electronic products, power tools and energy storage systems. As global energy and environmental problems become more and more serious, lithium-ion batteries are gradually moving from mobile phones, notebook computers, digital cameras and portable small appliances to the field of electric vehicle power. Therefore, the cycle performance, energy density and safety of lithium-ion batteries Performance also puts forward higher requirements. The ternary material exerts the synergistic effect of nickel-cobalt-manganese or nickel-cobalt-aluminum, so its performance is better than that of a single-component layered cathode material, and it is conside...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/485H01M4/525H01M4/62H01M10/0525
CPCH01M4/366H01M4/485H01M4/525H01M4/62H01M10/0525Y02E60/10
Inventor 赖延清汤依伟张治安吴剑尚国志杨幸
Owner CENT SOUTH UNIV
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