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Ternary positive electrode material with dual-core shell structure and preparation method thereof

A ternary material, core-shell type technology, applied in the direction of structural parts, electrical components, battery electrodes, etc., can solve the problems of residual, affecting the cycle life and specific capacity of lithium-ion batteries, and producing harmful substances, so as to reduce energy consumption, Eliminates washing and drying processes and improves cycle life

Pending Publication Date: 2020-11-10
成都巴莫科技有限责任公司
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

However, after the ternary positive electrode material is coated with an acidic coating agent to make a lithium battery, although the problem of residual alkali can be solved, oxides are often used as the acidic coating agent in the prior art, and this type of acidic coating agent is very easy to use The side reaction of the electrolyte produces harmful substances, which affects the cycle life and specific capacity of lithium-ion batteries

Method used

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  • Ternary positive electrode material with dual-core shell structure and preparation method thereof
  • Ternary positive electrode material with dual-core shell structure and preparation method thereof
  • Ternary positive electrode material with dual-core shell structure and preparation method thereof

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preparation example Construction

[0044] A method for preparing a double core-shell type ternary material, comprising the steps of:

[0045] (1) Weigh the lithium source and the ternary material precursor according to the molar ratio of Li: ternary material precursor = (1+x): 1, and weigh the oxide additive in addition, and fully mix the above materials in a high-speed mixer Mixture A is obtained after uniformity; wherein, 0.01≤x≤0.09, the oxide additive is one or more of nano-alumina, nano-titanium oxide, and nano-magnesia. In terms of mass ratio, the oxide additive / mixture A =0.1~0.5%;

[0046] (2) The mixture A is roasted, the roasting atmosphere is an inert atmosphere or an oxygen-containing atmosphere, the roasting temperature is 700 ° C to 950 ° C, the roasting time is 10 to 20 hours, after the roasting is completed, cool for 4 to 12 hours, then pulverize and sieve The semi-finished product B is obtained, and the particle size of the semi-finished product B is 8-13 μm;

[0047] (3) Stir the semi-finish...

Embodiment 1

[0061] A method for preparing a double core-shell type ternary material, comprising the steps of:

[0062] (1) Weigh lithium hydroxide and ternary material precursor (Ni 0.8 co 0.2 mn 0.2 )(OH) 2 In addition, according to the mass ratio of 1:2, the mixture of nano-alumina and nano-magnesia is weighed as an additive, and the above-mentioned materials are fully mixed in a high-speed mixer to obtain a mixture A; wherein, x=0.05, and the mass of the additive accounts for the weight of the mixture. The mass ratio of A is 0.2%;

[0063] (2) The mixture A is roasted, the roasting atmosphere is an oxygen-containing atmosphere, the roasting temperature is 750°C, and the roasting time is 15 hours. After the roasting is completed, it is cooled for 8 hours and then pulverized and sieved to obtain the semi-finished product B. The particle size of the semi-finished product B is 12μm;

[0064] (3) Stir and mix the semi-finished product B and the iron-aluminum phosphate according to a ce...

Embodiment 2

[0091] A method for preparing a double core-shell type ternary material, comprising the steps of:

[0092] (1) Take Lithium Carbonate and (Ni 0.5 co 0.3 mn 0.2 )(OH) 2 , In addition, aluminum oxide is weighed as an additive, and the above-mentioned materials are fully mixed in a high-speed mixer to obtain a mixture A; wherein in terms of mass ratio, the oxide additive / mixture A=0.1%;

[0093] (2) The mixture A is roasted, the roasting atmosphere is an inert atmosphere or an oxygen-containing atmosphere, the roasting temperature is 700° C., and the roasting time is 10 hours. After the roasting is completed, it is cooled for 4 hours and then pulverized and sieved to obtain the semi-finished product B. The semi-finished product The particle size of B is 8 μm;

[0094] (3) Stir and mix the semi-finished product B and aluminum trifluoromethanesulfonate according to a certain ratio to obtain a mixture C; wherein, in terms of mass ratio, aluminum trifluoromethanesulfonate / mixture...

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Abstract

The invention discloses a ternary material with a stable dual-core-shell structure and a preparation method thereof. The ternary material is doubly coated with an acidic metal material and a porous polymer material, the existing washing and drying processes are omitted in process, and meanwhile, the porous polymer material is uniformly coated on the surface of the positive electrode material by using a spray centrifugal coating machine, so the stability of the ternary material is enhanced, the content of residual alkali on the surface is reduced, and the material is enabled not to react with H2O and CO2 in the air, so the material is easy to store; after the positive electrode material is prepared into the lithium ion battery, the sufficient contact between the positive electrode and an electrolyte is ensured by the porous structure, and the capacity and the cycling stability of the lithium ion secondary battery are effectively improved.

Description

technical field [0001] The invention relates to the field of lithium-ion battery materials, in particular to a double-core-shell structure ternary positive electrode material and a preparation method thereof. Background technique [0002] High nickel ternary cathode material (LiNi x co y mn z o 2 , x+y+z=1, usually x≥0.5) has become the most promising cathode material for lithium-ion batteries due to its high capacity and other characteristics. However, in the preparation process of high-nickel ternary materials, the surface of the finished product has more residual alkali, and the pH is higher, so it is easy to absorb CO in the air. 2 and H 2 O has a side reaction. After the lithium ion cathode material is made into a lithium ion battery, it will have a side reaction with the electrolyte during charging and discharging, which will affect the capacity and cycle life of the lithium ion battery. [0003] At present, the water washing process and the primary sintering pro...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M4/62H01M4/624H01M4/628H01M10/0525Y02E60/10
Inventor 吴孟涛陈燕华徐宁吕菲程晓焜
Owner 成都巴莫科技有限责任公司
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