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Ternary cathode material coated with lithium tungstate and preparation method of ternary cathode material

A technology for coating lithium tungstate and positive electrode materials, which is applied to positive electrodes, electrical components, battery electrodes, etc., can solve problems such as potential safety hazards, increase the internal pressure of batteries, etc., and achieve environmental protection, simple operation, and good controllability. Effect

Inactive Publication Date: 2020-04-28
CENT SOUTH UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This side reaction will generate a large amount of gas inside the battery, which will increase the internal pressure of the battery and cause safety hazards

Method used

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  • Ternary cathode material coated with lithium tungstate and preparation method of ternary cathode material
  • Ternary cathode material coated with lithium tungstate and preparation method of ternary cathode material
  • Ternary cathode material coated with lithium tungstate and preparation method of ternary cathode material

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Effect test

Embodiment 1

[0035] A ternary cathode material LiNi coated with lithium tungstate 0.8 co 0.1 mn 0.1 o 2 , lithium tungstate and LiNi 0.8 co 0.1 mn 0.1 o 2 The middle transition metal element satisfies the following molar ratio: W / (Ni+Co+Mn)=0.08%.

[0036] The specific steps of the preparation method of the above-mentioned ternary cathode material coated with lithium tungstate are:

[0037] (1) Weigh 5g ternary precursor Ni 0.8 co 0.1 mn 0.1 (OH) 2 , put into a tube furnace, and calcined at 750°C for 4h in an air atmosphere.

[0038] (2) Weigh 0.0084g of ammonium paratungstate, dissolve it in 20ml of pure water, and stir until the ammonium paratungstate is completely dissolved.

[0039] (3) Weigh 3 g of the precursor calcined in step (1) and add it to the solution in step (2), stir at room temperature for 10 h, and then stir in an oil bath at 90°C until evaporated to dryness to obtain a solid powder.

[0040](4) Weigh 1.8943g LiOH according to the transition metal to lithium m...

Embodiment 2

[0044] A ternary cathode material LiNi coated with lithium tungstate 0.8 co 0.1 mn 0.1 o 2 , lithium tungstate and LiNi 0.8 co 0.1 mn 0.1 o 2 Middle transition metal elements satisfy the following molar ratio: W / (Ni+Co+Mn)=0.16%

[0045] The specific steps of the preparation method of the above-mentioned ternary cathode material coated with lithium tungstate are:

[0046] (1) Weigh 5g ternary precursor Ni 0.8 co 0.1 mn 0.1 (OH) 2 , put into a tube furnace, and calcined at 750°C for 4h in an air atmosphere.

[0047] (2) Weigh 0.0168g of ammonium paratungstate, dissolve it in 20ml of pure water, and stir until the ammonium paratungstate is completely dissolved.

[0048] (3) Weigh 3 g of the precursor calcined in step (1) and add it to the solution in step (2), stir at room temperature for 10 h, and then stir in an oil bath at 90°C until evaporated to dryness to obtain a solid powder.

[0049] (4) Weigh 1.8943g LiOH according to the transition metal to lithium molar ...

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Abstract

The invention provides a ternary positive electrode material coated with lithium tungstate and a preparation method of the material, and the preparation method comprises the following steps: calcininga nickel-cobalt-manganese hydroxide precursor to obtain a porous nickel-cobalt-manganese oxide precursor; dissolving a tungsten source in a solvent to form a tungsten source solution; dispersing theporous nickel-cobalt-manganese oxide precursor in the tungsten source solution, and then carrying out stirring, dipping and evaporating to dryness to obtain a powder product; and mixing the powder product with a lithium source according to a molar ratio of 1: 1.03-1.05, and sintering a mixture to obtain the ternary positive electrode material coated with lithium tungstate. The obtained positive electrode material is porous nickel cobalt lithium manganate, the surface of the porous nickel cobalt lithium manganate is coated with lithium tungstate, and the inner walls of pores are coated with lithium tungstate, so that the capacity retention ratio and the cycle performance of the positive electrode material are effectively improved.

Description

technical field [0001] The invention relates to the field of positive electrode materials for lithium ion batteries, in particular to a ternary positive electrode material coated with lithium tungstate and a preparation method thereof. Background technique [0002] Lithium-ion rechargeable secondary batteries were successfully commercialized by Sony Corporation of Japan as early as the late 20th century, thereby replacing the original secondary batteries such as nickel-metal hydride. At present, lithium-ion batteries have been widely used in various portable electronic products, power tools and energy storage systems. With the increasingly serious global energy and environmental problems, lithium-ion batteries are gradually moving towards the field of electric vehicle power. Therefore, lithium-ion batteries are required to have the advantages of high energy density, high power density, environmental friendliness, good safety, and low price. The current ternary cathode mater...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/505H01M4/525H01M10/0525
CPCH01M4/364H01M4/485H01M4/505H01M4/525H01M10/0525H01M2004/028Y02E60/10
Inventor 王志兴张晓明颜果春郭华军李新海王接喜胡启阳彭文杰曾玥熙谭欣欣李旭蒋湘康
Owner CENT SOUTH UNIV
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