Multi-metal composite oxide coated lithium-rich manganese-based positive electrode material and preparation method thereof

A composite oxide, lithium-rich manganese-based technology, used in positive electrodes, active material electrodes, nanotechnology for materials and surface science, etc., can solve problems such as unevenness, fragmentation, secondary particle cracks, etc. The effect of stability

Active Publication Date: 2020-12-29
HUNAN CHANGYUAN LICO CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] In order to solve the problems that the secondary particles of the lithium-rich manganese-based positive electrode material are cracked or even broken, improve the cycle performance and rate performance of the material, and the coating layer is easy to fall off and the coating is uneven, the technical solution proposed by the present invention is:

Method used

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  • Multi-metal composite oxide coated lithium-rich manganese-based positive electrode material and preparation method thereof
  • Multi-metal composite oxide coated lithium-rich manganese-based positive electrode material and preparation method thereof
  • Multi-metal composite oxide coated lithium-rich manganese-based positive electrode material and preparation method thereof

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Embodiment 1

[0046] A method for preparing a multi-metal composite oxide-coated lithium-rich manganese-based positive electrode material of the present invention, the specific steps are as follows:

[0047] (1) Metal powders of 500nm gadolinium (Gd), niobium (Nb), zirconium (Zr) and strontium (Sr) (n(Gd):n(Nb):n(Zr):n(Sr)=0.05 :0.5:0.5:0.5) was added into hydrochloric acid with a concentration of 0.5mol / L, mechanically stirred for 3 hours, and the rotating speed of the mechanically stirred was 300r / min. After stirring, the solution was filtered, and the filter residue was vacuum-dried in a vacuum oven. The temperature is 80°C, and the drying time is 5.0h to obtain pre-activated metal powder;

[0048] (2) Add the pre-activated metal powder and urea-formaldehyde resin obtained in step (1) into 2mol / L lithium nitrate aqueous solution for reaction, the reaction temperature is 80°C, and the reaction time is 5h. After the reaction is completed, use an ultrasonic cell disruptor (ultrasonic power...

Embodiment 2

[0060] A method for preparing a multi-metal composite oxide-coated lithium-rich manganese-based positive electrode material of the present invention, the specific steps are as follows:

[0061] (1) Metal powders of 700nm gadolinium (Gd), niobium (Nb), zirconium (Zr) and strontium (Sr) (n(Gd):n(Nb):n(Zr):n(Sr)=0.05 :0.5:0.5:0.5) was added into nitric acid with a concentration of 0.6mol / L and carried out mechanical stirring for 4h, the rotating speed of mechanical stirring was 250r / min, filtered, and the filter residue was vacuum-dried in a vacuum oven at a drying temperature of 90°C. The time is 7.0h, and the metal powder of preactivation treatment is obtained;

[0062] (2) Add the pre-activated metal powder and urea-formaldehyde resin obtained in step (1) into 1mol / L lithium acetate aqueous solution for reaction, the reaction temperature is 110°C, and the time is 3h; after the reaction is completed, use an ultrasonic cell disruptor to disperse After 3 hours (the ultrasonic po...

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Abstract

The invention discloses a multi-metal composite oxide coated lithium-rich manganese-based positive electrode material. The surface of a substrate is coated with a multi-metal (Li, Gd, Nb, Zr and Sr) composite oxide layer. The preparation method comprises the steps: carrying out pre-activation treatment on nano metal; adding the pre-activated metal powder and a high-molecular compound into a lithium-containing solution for reaction, dispersing by an ultrasonic cell crusher, adding a lithium-rich manganese-based positive electrode material matrix, stirring a multifunctional dispersion machine, stirring, and heating to form gel; adding the gel into a mechanical fusion machine, carrying out mechanical premixing under a low-speed condition, and then carrying out high-speed mechanical fusion tocomplete coating of the material; and finally, annealing, and naturally cooling along with a furnace to obtain the multi-metal composite oxide coated lithium-rich manganese-based positive electrode material. The coating layer on the surface of the lithium-rich manganese-based positive electrode material substrate can prevent the reaction between an electrode and an electrolyte and prevent the phenomenon of capacity attenuation or cycle performance deterioration of the lithium-rich manganese-based positive electrode material substrate.

Description

technical field [0001] The invention belongs to the field of battery materials, in particular to a multi-metal composite oxide-coated lithium-rich manganese-based positive electrode material and a preparation method thereof. Background technique [0002] At present, the research and development of cathode materials for lithium-ion batteries is lagging behind, which has become one of the factors restricting the further development of the lithium battery industry. In recent years, the state has proposed that the specific energy of power batteries will reach 350Wh / kg by 2020, so the demand for new high-capacity cathode materials for lithium-ion power batteries is more urgent. [0003] Compared with traditional cathode materials, lithium-rich manganese-based layered cathode materials Li[Li 1-x-y-z Ni x co y mn z ]O 2 It is cheap, more environmentally friendly, has a charging mechanism different from traditional cathode materials, the charging voltage can be as high as 4.5V,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/505H01M4/525H01M10/0525B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/505H01M4/525H01M4/624H01M4/628H01M10/0525H01M2004/021H01M2004/028Y02E60/10
Inventor 廖达前唐朝辉朱健吴涛胡柳泉周友元
Owner HUNAN CHANGYUAN LICO CO LTD
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