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Coated lithium ion battery high-nickel positive electrode material and preparation method thereof

A lithium-ion battery and cathode material technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of non-primary particle interface coating, impedance rise, effect discount, etc., to eliminate residual alkali substances and suppress high-temperature gas production. , the effect of improving processing performance

Inactive Publication Date: 2018-11-23
内蒙古华夏新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since this method can only achieve coating on the surface of the secondary particle of the high-nickel cathode material, it cannot coat the interface of the primary particle
Once the secondary particles of the pole piece are broken during the rolling process, the coating effect will be greatly reduced
At the same time, in the long-term cycle, it is difficult to suppress the microcracks inside the secondary particles caused by the volume effect, exposing the fresh interface of the primary particles and causing side reactions with the electrolyte, resulting in an increase in impedance and capacity attenuation.

Method used

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  • Coated lithium ion battery high-nickel positive electrode material and preparation method thereof
  • Coated lithium ion battery high-nickel positive electrode material and preparation method thereof
  • Coated lithium ion battery high-nickel positive electrode material and preparation method thereof

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Embodiment 1

[0032] Such as figure 1 As shown, the preparation method of a kind of coated lithium ion battery high-nickel positive electrode material provided by the invention: the LiNi of 100g 0.88 co 0.09 Al 0.03 o 2 Carry out mechanical fine grinding and dissociate into a primary particle structure, weigh 4.55g of aluminum isopropoxide, add 450mL of isopropanol for ultrasonic dissolution, and add the dissociated LiNi under stirring 0.88 co 0.09 Al 0.03 o 2 , after reacting for 1 hour, enter closed cycle spray drying, set the temperature of air inlet and air outlet to 250°C and 100°C respectively, recover isopropanol, and at the same time, LiNi 0.88 co 0.09 Al 0.03 o 2 Granulation to re-form secondary particles; the collected precursor was sintered at 500°C for 3h in an oxygen-rich atmosphere to obtain 1.5wt% LiAlO 2 Coated LiNi 0.88 co 0.09 Al 0.03 o 2 .

[0033] From figure 2 , 3 From the comparative SEM images shown, LiNi 0.88 co 0.09 Al 0.03 o 2After mechanical ...

Embodiment 2

[0037] In the present embodiment, the LiNi of 100g 0.8 co 0.1 Ti 0.1 o 2 Carry out mechanical fine grinding and dissociate into a primary particle structure, weigh 3.1g tetrabutyl titanate and 2.1g zirconium isopropoxide, add 200mL n-propanol and 300mL n-butanol to ultrasonically dissolve, add the dissociated LiNi under stirring 0.8 co 0.1 Ti 0.1 o 2 , after reacting for 2 hours, it enters the closed cycle spray drying, recovers the organic solvent, and sinters the collected precursor at 700 °C for 1 hour under an oxygen atmosphere to obtain 1wt% Li 2 TiO 3 and 1 wt% Li 2 TiO 3 Coated LiNi 0.8 co 0.1 Ti 0.1 o 2 .

Embodiment 3

[0039] In the present embodiment, the LiNi of 100g 0.6 co 0.2 mn 0.2 o 2 Carry out mechanical fine grinding and dissociate into a primary particle structure, weigh 0.31g of aluminum isopropoxide, add 100mL of ethanol for ultrasonic dissolution, and add the dissociated LiNi under stirring 0.6 co 0.2 mn 0.2 o 2 , after reacting for 3 hours, it enters the closed cycle spray drying, recovers the organic solvent, and sinters the collected precursor at 400 °C for 6 hours under an oxygen atmosphere to obtain 0.1wt% LiAlO 2 Coated LiNi 0.6 co 0.2 mn 0.2 o 2 .

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Abstract

The invention relates to the technical field of batteries, and in particular relates to a coated lithium ion battery high-nickel positive electrode material and a preparation method thereof. Accordingto the coated lithium ion battery high-nickel positive electrode material and the preparation method thereof provided by the invention, a high-nickel positive electrode material is subjected to mechanical fine grinding and dissociation to form primary particles, and then the particles are added into an aluminum-containing organic solution, a titanium-containing organic solution or a zirconium-containing organic solution; after the mixture is uniformly mixed, closed-type circulating spray drying is adopted, and the dried mixture is sintered to obtain the high-nickel positive electrode material, wherein the surfaces of the primary particles and the secondary particles are both coated with a lithium ion conductor compound. According to the method, the effect of remarkably reducing the content of the residual alkali substance is achieved, and the cycle and storage performance of the material are obviously improved. The preparation method disclosed by the invention is simple in process andsuitable for large-scale preparation and has a relatively high application prospect.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to a high-nickel cathode material for a coated lithium-ion battery and a preparation method thereof. Background technique [0002] High-nickel cathode materials (Ni mole fraction ≥ 0.6) have obvious advantages in energy density in the current practical application of lithium-ion battery cathode materials, which can better meet the requirements of battery energy in the fields of electric vehicles, digital electronic products, military and aerospace. The increasing demand for density. However, as the Ni content increases above 0.6, the cycle performance (especially at high temperature), thermal stability and storage performance of the material deteriorates sharply, thus limiting its practical application, especially in large-capacity batteries. Applications. The nature of these shortcomings is closely related to the basic properties of high-nickel cathode materials, in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525
CPCH01M4/505H01M4/525Y02E60/10
Inventor 马新胜孔凡滔
Owner 内蒙古华夏新材料科技有限公司
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