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Fluorine-containing lithium ion battery positive electrode material and preparation method thereof

A technology of lithium ion battery and positive electrode material, applied in the field of positive electrode material of fluorine-containing lithium ion battery and its preparation, can solve the problems of high residual alkali content on the surface of high nickel positive electrode material, poor processing performance and electrochemical performance, etc. Low, unique raw materials, simple operation effect

Active Publication Date: 2018-02-23
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to solve the above-mentioned problems in the prior art, the object of the present invention is to provide a fluorine-containing lithium-ion battery positive electrode material and a preparation method thereof, so as to solve the high residual alkali content on the surface of the high-nickel positive electrode material in the prior art and the processing performance. and electrochemical performance is not good enough

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  • Fluorine-containing lithium ion battery positive electrode material and preparation method thereof
  • Fluorine-containing lithium ion battery positive electrode material and preparation method thereof
  • Fluorine-containing lithium ion battery positive electrode material and preparation method thereof

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Embodiment 1

[0057] This embodiment provides a method for preparing a positive electrode material for a fluorine-containing lithium ion battery, the specific preparation method of which is:

[0058] First, 1g of ammonium fluorosilicate was dissolved in water and added to the reaction kettle, and the high-nickel cathode material LiNi with an average particle size of 12.5 μm was weighed. 0.815 co 0.15 al 0.035 o 2 Slowly add 100g into the reaction kettle, the solid-to-liquid mass ratio of the high-nickel cathode material to the salt solution containing polyfluorinated compounds is 2:1, the stirring speed is 300r / min, after 30min of reaction, turn on the heating source, and the heating temperature is 100°C , drying while stirring, the stirring speed is 500rpm, the drying time is 60min, the dried LiNi 0.815 co 0.15 al 0.035 o 2 Place in a box-type atmosphere furnace, sinter under nitrogen atmosphere, heat treatment temperature is 400 °C, holding time 6h, and cool to room temperature wit...

Embodiment 2

[0067] This embodiment provides a method for preparing a positive electrode material for a fluorine-containing lithium ion battery, the specific preparation method of which is:

[0068] First, 2 g of ammonium fluorozirconate was dissolved in water and added to the reaction kettle, and the high-nickel cathode material LiNi with an average particle size of 12.0 μm was weighed. 0.80 co 0.10 mn 0.10 o 2 100g was slowly added to the reaction kettle, the solid-to-liquid mass ratio of the high-nickel positive electrode material to the salt solution containing polyfluorinated compounds was 1:1, the stirring speed was 300r / min, and after 30min of reaction, the heating source was turned on, and the heating temperature was 110°C. Stir while drying, the stirring speed is 600rpm, the drying time is 80min, the dried LiNi 0.80 co 0.10 mn 0.10 o 2 Place in a box-type atmosphere furnace, sinter under nitrogen atmosphere, heat treatment temperature is 400 °C, holding time 6h, and cool to...

Embodiment 3

[0073] This embodiment provides a method for preparing a positive electrode material for a fluorine-containing lithium ion battery, the specific preparation method of which is:

[0074] First, 5 g of magnesium trifluoromethanesulfonate was dissolved in water and added to the reaction kettle, and the high-nickel cathode material LiNi with an average particle size of 11.5 μm was weighed. 0.83 co 0.10 mn 0.07 o 2 Slowly add 100g into the reaction kettle, the solid-to-liquid mass ratio of the high-nickel cathode material to the salt solution containing polyfluorinated compounds is 1:2, the stirring speed is 400r / min, after 30 minutes of reaction, turn on the heating source, and the heating temperature is 110°C , drying while stirring, the rotating speed is 500rpm, the drying time is 100min, the dried LiNi 0.83 co 0.10 mn 0.07 o 2 Place in a box-type atmosphere furnace, sinter under nitrogen atmosphere, heat treatment temperature is 350 °C, holding time 8h, and cool to room ...

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Abstract

The invention discloses a fluorine-containing lithium ion battery positive electrode material. The fluorine-containing lithium ion battery positive electrode material comprises a high-nickel positiveelectrode material and a coating layer containing a poly-fluorine compound. The preparation method of the fluorine-containing lithium ion battery positive electrode material comprises the steps of (1)mixing the high-nickel positive electrode material and a salt solution containing the poly-fluorine compound to form a solid-liquid mixture, and performing reaction to obtain a mixture with the coating layer; and (2) drying the mixture with the coating layer and obtained in the step (1), and performing thermal processing in inert atmosphere to obtain the fluorine-containing lithium ion battery positive electrode material. With the fluorine-containing lithium ion battery positive electrode material provided by the invention, the residual alkali quantity on a surface of the high-nickel positiveelectrode material of the lithium ion battery is effectively reduced, the high- and low-temperature cycle property and the capacity of the high-nickel positive electrode material are improved, and the processing performance and the safety of the high-nickel positive electrode material are improved; and the preparation method is simple to operate, is low in cost and is suitable for mass production.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery cathode materials, and in particular relates to a fluorine-containing lithium-ion battery cathode material and a preparation method thereof. Background technique [0002] Due to its high energy density, good safety, and long cycle life, lithium-ion batteries are widely used in portable small lithium-ion products such as cameras and mobile phones, as well as large-scale electric vehicle power batteries. With the increasing energy crisis, the development of electric vehicles has become the focus of global attention. [0003] The performance of the power battery is the limiting factor that determines the development of electric vehicles. The cathode material is the core key material of the power lithium battery. The current mainstream power lithium battery cathode material is spinel lithium manganese oxide LiMn 2 o 4 , lithium iron phosphate LiFePO with olivine structure 4 and layered ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/505H01M4/525H01M4/62H01M10/0525H01M10/42
CPCH01M4/366H01M4/485H01M4/505H01M4/525H01M4/62H01M10/0525H01M10/4235Y02E60/10
Inventor 谭强强冯海兰
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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