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A kind of lithium-ion battery ternary cathode material and preparation method thereof

A technology for lithium-ion batteries and positive electrode materials, applied in battery electrodes, electrical components, secondary batteries, etc., can solve the problems of poor electrolyte contact, poor electrochemical performance, and low cycle capacity, and achieve improved electrochemical performance, The effect of low cost and simple operation

Active Publication Date: 2019-11-22
HUAZHONG UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the above defects or improvement needs of the prior art, the present invention provides a lithium-ion battery ternary positive electrode material and a preparation method thereof, which fully combines the preparation characteristics and requirements of the lithium-ion battery ternary positive electrode material, and is suitable for nickel-cobalt-manganese three-component The preparation method of the primary positive electrode material was redesigned, and a lithium ion ternary positive electrode material Ni-Co-Mn with a layered crystal structure and a hollow structure and a particle size range of 300-600nm was obtained accordingly, thereby solving the problem of the prior art Ternary cathode material has large particle size, poor contact with electrolyte, low cycle capacity, and poor electrochemical performance.

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  • A kind of lithium-ion battery ternary cathode material and preparation method thereof
  • A kind of lithium-ion battery ternary cathode material and preparation method thereof
  • A kind of lithium-ion battery ternary cathode material and preparation method thereof

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preparation example Construction

[0036] The preparation method of lithium ion battery ternary cathode material provided by the invention comprises the following steps:

[0037](1) After mixing carbon spheres, nickel salts, cobalt salts and manganese salts, add absolute ethanol, and stir to obtain a mixed suspension; wherein, the surface of the carbon spheres contains oxygen-containing functional groups, and its diameter is 300nm-700nm; The carbon spheres are prepared according to the following method: disperse the carbon source in deionized water to obtain a transparent and uniform solution, and perform a hydrothermal reaction to obtain a carbon sphere template. The preferred preparation process of carbon spheres is: using glucose or sucrose as a carbon source, stirring, preferably ultrasonic stirring, for 20-60 minutes, so that the carbon source is dispersed in deionized water to obtain a transparent and uniform solution, in which the glucose or sucrose The mass concentration is 5%-10%, at 150°C-220°C, prefe...

Embodiment 1

[0047] Dissolve 2.4g of glucose in 30ml of deionized water, stir it for 1 hour, put it in a 50ml hydrothermal kettle at 180°C for 10 hours, centrifuge, wash with water and ethanol, and then freeze-dry to obtain the carbon sphere template.

[0048] According to the metal content of 200mg, add a certain amount of NiCl in 80ml absolute ethanol 2 ·6H 2 O, CoCl 2 ·6H 2 O, MnCl 2 4H 2 O, wherein the ratio of the three metal elements is 8:1:1, while adding 200 mg of carbon sphere template, and then stirring the suspension obtained by ultrasonication. Then slowly add 80ml of ammonia solution with a concentration of 0.07mol / L, continue to stir for 4h, centrifuge and wash, and dry in a blast dryer at 60°C.

[0049] The dried precursor was calcined at 500 °C for 3 h in the air atmosphere to obtain the metal oxide, and then a certain amount of anhydrous Li was added 2 CO 3 , to ensure that the atomic ratio of Li to metal in the material is 1.1:1, after grinding, the temperature is ...

Embodiment 2

[0063] Dissolve 2.4g of glucose in 30ml of deionized water, stir it for 1 hour, put it in a 50ml hydrothermal kettle at 180°C for 10 hours, centrifuge, wash with water and ethanol, and then freeze-dry to obtain the carbon sphere template.

[0064] According to the metal content of 200mg, add a certain amount of NiCl in 80ml absolute ethanol 2 ·6H 2 O, CoCl 2 ·6H 2 O, MnCl 2 4H 2 O, wherein the ratio of the three metal elements is 1:1:1, while adding 200 mg of carbon sphere template, and then stirring the suspension obtained by ultrasonication. Then slowly add 80ml of ammonia solution with a concentration of 0.07mol / L, continue to stir for 4h, centrifuge and wash, and dry in a blast dryer at 60°C.

[0065] The dried precursor was calcined at 500 °C for 3 h in the air atmosphere to obtain the metal oxide, and then a certain amount of anhydrous Li was added 2 CO 3 , ensure that the atomic ratio of Li to metal in the material is 1.2:1, heat up to 750°C after grinding and ca...

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Abstract

The invention belongs to the field of lithium ion battery electrodes, and specifically relates to a lithium ion battery ternary cathode material and a preparation method thereof. According to the lithium ion battery ternary cathode material provided by the invention, carbon spheres containing an oxygen-containing functional group on the surface and with particle size of 300-700 nm are adopted as atemplate, and a submicron-grade nickel-rich ternary cathode material is prepared by a co-precipitation way. After a battery is assembled with the material provided by the invention, at a current density of 0.1 C and in a voltage window of 2.7-4.5 V, the first specific discharge capacity reaches 255 mAh g<-1>, and a specific capacity of 154mAh g<-1> is still maintained after 70 rounds of circulation. The preparation method of the ternary cathode material provided by the invention has the advantages of easiness in operation, low cost and high work voltage and can be applied to industrial production.

Description

technical field [0001] The invention belongs to the field of lithium-ion battery electrodes, and more specifically relates to a lithium-ion battery ternary cathode material and a preparation method thereof. Background technique [0002] Lithium-ion batteries are widely used in portable electronic devices such as mobile phones, laptops, and digital cameras due to their light weight and high energy density, and are rapidly developing in large-scale energy storage and high-power systems (electric vehicles). Lithium-ion battery cathode material is one of the keys to restrict the further development of lithium-ion batteries, so it is necessary to develop a cathode material with high specific capacity, safety and stability, and simple preparation. Among them, the nickel-rich ternary metal layered oxide Li(Ni 1-x-y co x mn y ) has a high theoretical specific capacity (>220mAh g - 1), the advantages of high discharge platform (>3.6V), low cost and easy availability have at...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G53/00H01M4/505H01M4/525H01M10/0525
CPCC01G53/006C01P2002/72C01P2004/03C01P2004/04C01P2004/62C01P2006/40H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 王得丽梁嘉宁夏克东黄亭赖成龙
Owner HUAZHONG UNIV OF SCI & TECH
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