Surface modified lithium battery high-nickel anode material and preparation method thereof

A positive electrode material and surface modification technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as poor cycle performance and low first-cycle efficiency, and achieve improved discharge specific capacity, improved charge and discharge efficiency, and improved cycle performance. Good results

Inactive Publication Date: 2016-12-07
HUAZHONG UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The resulting lithium-ion secondary battery has greatly improved its first-cycle efficiency and cycle performance by overcoming the problems of low first-cycle efficiency and poor cycle performance during the charge-discharge process of high-nickel cathode materials.

Method used

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  • Surface modified lithium battery high-nickel anode material and preparation method thereof
  • Surface modified lithium battery high-nickel anode material and preparation method thereof
  • Surface modified lithium battery high-nickel anode material and preparation method thereof

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preparation example Construction

[0035] The invention provides a method for preparing a surface-modified lithium battery high-nickel cathode material, comprising the following steps:

[0036] (a) Take a certain amount of transition metal salt and high-nickel positive electrode material, described transition metal salt (for example: inorganic salts such as nitrate, carbonate, phosphate, chloride, or organic salts such as acetate) and The mass ratio of the high-nickel cathode material is 100:0.5~100:5;

[0037] Wherein, the transition metal element in the transition metal salt is one of Co, V, Fe, Mn, Ni, Zn, Y, Zr, Nb, Mo, Ru, Rh, Pd, Ag, Cd; Nickel cathode material is LiNi x co y m z o 2 , where 0.6≤x≤1, 0≤y≤0.4, 0≤z≤0.4, and x+y+z=1, M is one or more of Mn, Al, Mg, Ti;

[0038] (b) dissolving the transition metal salt in a certain amount of deionized water or absolute ethanol, fully stirring until completely dissolved;

[0039] (c) dripping the prepared transition metal salt solution into the high-nick...

Embodiment 1

[0049] Weigh 0.5g of LiNi 0.8 co 0.15 al 0.05 o 2 , according to Co:LiNi 0.8 co 0.15 al 0.05 o 2 The ratio is 1:100. Weigh cobalt nitrate hexahydrate, dissolve cobalt nitrate hexahydrate in absolute ethanol at a concentration of 0.01mol / L, stir until completely dissolved, and obtain cobalt nitrate ethanol solution. Add cobalt nitrate ethanol solution dropwise to LiNi 0.8 co 0.15 al 0.05 o 2 in, until just submerged LiNi 0.8 co 0.15 al 0.05 o 2 powder, will immerse LiNi 0.8 co 0.15 al 0.05 o 2 Put the powder in an oven at 80°C for drying, repeat the dripping drying process, then continue drying the material for 12 hours, grind the dried material for 45 minutes, and finally put the processed material in an air furnace at 600°C Processing 2h.

Embodiment 2

[0051] Weigh 0.5g of LiNi 0.6 co 0.2 mn 0.3 o 2 , according to Co:LiNi 0.6 co 0.2 mn 0.3 o 2 The ratio is 0.5:100. Weigh cobalt nitrate hexahydrate, dissolve cobalt nitrate hexahydrate in deionized water at a concentration of 0.01mol / L, and stir until completely dissolved to obtain a cobalt nitrate solution. Add cobalt nitrate solution dropwise to LiNi 0.6 co 0.2 mn 0.3 o 2 in, until just submerged LiNi 0.6 co 0.2 mn 0.3 o 2 powder, will immerse LiNi 0.6 co 0.2 mn 0.3 o 2 Dry the powder in an oven at 60°C, repeat the dripping drying process, then continue drying the material for 24 hours, grind the dried material for 30 minutes, and finally put the processed material in an air furnace at 400°C Processing 5h.

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Abstract

The invention belongs to the field of lithium ion secondary batteries, and more concretely relates to a surface modified lithium battery high-nickel anode material and a preparation method thereof. The method includes the following steps: weighing a certain amount of transition metal salt and high-nickel anode material, preparing a transition metal salt solution, making the transition metal salt solution drip into the high-nickel anode material and drying the high-nickel anode material, immersing and drying the high-nickel anode material many times till the whole transition metal salt solution drip into the material, continuing drying the high-nickel anode material and grinding the material, processing the ground material in an air furnace, and finally obtaining the high-nickel anode material the surface of which is wrapped in transition metal oxides. The high-nickel anode material prepared from the above method is used for preparing lithium ion secondary batteries. The surface modified high-nickel anode material enables the first-circle efficiency and the cycle performance of a secondary battery to be greatly improved. Moreover, the preparation method is simple and feasible, the surface modified high-nickel anode material is low in cost and suitable for large-scale production, etc.

Description

technical field [0001] The invention belongs to the field of secondary lithium ion batteries, and more specifically relates to a surface-modified lithium battery high-nickel positive electrode material and a preparation method thereof, which can improve the first cycle efficiency and cycle performance of the high-nickel positive electrode material. Background technique [0002] With the continuous progress of society and the rapid growth of the global economy, products brought about by the continuous development of science and technology play an indispensable role in people's lives. Electronic products, electric vehicles, medical equipment, etc. The requirements are getting higher and higher, people's demand for energy is increasing, and the understanding of the importance of sustainable social and economic development is deepening. Lithium-ion battery, as a new generation of green high-energy rechargeable battery, has achieved rapid development in the past 20 years due to i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/505H01M4/525H01M4/58H01M10/0525
CPCH01M4/366H01M4/485H01M4/505H01M4/525H01M4/582H01M4/5825H01M10/0525Y02E60/10
Inventor 胡先罗黄亚群黄云辉
Owner HUAZHONG UNIV OF SCI & TECH
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