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A linkage modified lithium-rich manganese-based positive electrode material and preparation method thereof

A lithium-rich manganese-based, positive electrode material technology, applied in the direction of positive electrodes, active material electrodes, battery electrodes, etc., can solve the problems of poor rate performance, high surface alkalinity, capacity and voltage decay, etc., to promote migration, promote heavy Discharge, improve the effect of discharge capacity drop

Active Publication Date: 2021-07-23
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of the above-mentioned defects in the prior art lithium-rich manganese-based cathode materials, the first purpose of the present invention is to provide a linkage-modified lithium-rich manganese-based cathode material with good lattice stability and electrode / electrolyte interface stability Lithium-manganese-based cathode materials can not only inhibit the loss of lattice oxygen during cycling, but also inhibit the dissolution and migration of transition metals, thereby alleviating the capacity fading and voltage drop of lithium-rich manganese-based cathode materials during cycling, and effectively overcoming the current Some positive electrode materials have problems such as high surface alkalinity, poor rate performance, and severe capacity and voltage decay during cycling.

Method used

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  • A linkage modified lithium-rich manganese-based positive electrode material and preparation method thereof
  • A linkage modified lithium-rich manganese-based positive electrode material and preparation method thereof
  • A linkage modified lithium-rich manganese-based positive electrode material and preparation method thereof

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specific Embodiment approach

[0045] A specific implementation of the linkage modified lithium-rich manganese-based positive electrode material and its preparation method of the present invention generally includes the following steps:

[0046] (1) Place the cerium salt containing crystal water in a heating device, raise the temperature to a temperature of 200-400°C at a heating rate of 3-10°C / min in an air atmosphere, and calcinate for 2-5h to obtain anhydrous cerium salt The cerium salt containing crystal water is a common cerium salt on the market, and generally contains crystal water, such as cerium nitrate hexahydrate, cerium oxalate decahydrate, and cerium chloride heptahydrate; Heating devices such as tube furnaces or shaft furnaces;

[0047] (2) Evenly disperse the precursor and the anhydrous cerium salt obtained in step (1) in an organic solvent with a liquid-solid ratio of 20 to 50 mL / g, heat to 60 to 100 °C, and stir at a stirring speed of 300 to 500 r / g Under the condition of min, stir for 5-8...

Embodiment 1

[0063] A linkage-modified lithium-rich manganese-based positive electrode material and a preparation method thereof, comprising the following steps:

[0064] (1) Take 2g precursor Mn 0.672 Ni 0.164 co 0.164 CO 3 With 0.012g dehydrated Ce(NO 3 ) 3 Uniformly disperse in 50mL ethanol solution, heat and stir at 50°C for 4h, and then place the dispersion in a blast drying oven at 70°C for 12h to obtain the modified precursor.

[0065] (2) Mix the modified precursor obtained in step (1) with 1.02g LiOH·H 2 O was placed in an agate mortar, ground for 1 h in a dry environment, and the uniformly ground mixture was transferred to a corundum ark, and then placed in a tube furnace in an oxygen atmosphere for calcination, and the calcination condition was 5 °C / min to 500 °C, After constant temperature for 5 hours, raise the temperature to 900°C at 5°C / min, keep the temperature for 12h, and cool to room temperature with the furnace to obtain Li with a theoretical mass fraction of 1%. ...

Embodiment 2

[0067] A linkage-modified lithium-rich manganese-based positive electrode material and a preparation method thereof, comprising the following steps:

[0068] (1) Take 2g precursor Mn 0.672 Ni 0.164 co 0.164 CO 3 With 0.036g dehydrated Ce(NO 3 ) 3 Uniformly disperse in 50mL absolute ethanol solution, heat and stir at 50°C for 4h, and then place the dispersion in a blast drying oven at 70°C for 12h to obtain the modified precursor.

[0069] (2) Mix the modified precursor obtained in step (1) with 1.02g LiOH·H 2 O was placed in an agate mortar and ground for 1 h in a dry environment, and the uniformly ground mixture was transferred to a corundum ark, and then the uniformly ground mixture was calcined in a tube furnace in an oxygen atmosphere at a calcination condition of 5°C / min Raise the temperature to 500°C, keep the temperature for 5 hours, then raise the temperature to 900°C at 5°C / min, keep the temperature for 12 hours, and cool to room temperature with the furnace to ...

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Abstract

The invention discloses a linkage-modified lithium-rich manganese-based positive electrode material and a preparation method thereof, belonging to the technical field of lithium-ion battery positive electrode materials. The linkage modified lithium-rich manganese-based cathode material has a core-shell spherical structure, the inner core is a layered lithium-rich manganese-based cathode material doped with cerium, and the subsurface layer is spinel-type Li 4 mn 5 o 12 , the surface layer is Li with rich oxygen vacancies 2 CeO 3 The preparation method of the material is as follows: after calcination to remove crystal water, the cerium salt is dispersed in an organic solvent with the transition metal oxide precursor, heated, stirred, dried, and then ground and calcined with lithium salt to obtain a good The linkage modified lithium-rich manganese-based cathode material with excellent lattice stability and electrode / electrolyte interface stability overcomes the problems of existing cathode materials such as high surface alkalinity, poor rate performance, and severe capacity and voltage decay during cycling. Moreover, the preparation method of the positive electrode material is simple, the cost is low, and it is favorable for large-scale production.

Description

technical field [0001] The invention relates to a lithium-rich manganese-based cathode material for a lithium ion battery and a preparation method thereof, in particular to a linkage-modified lithium-rich manganese-based cathode material and a preparation method thereof, belonging to the technical field of lithium-ion battery materials. Background technique [0002] As a new type of secondary power supply, lithium-ion batteries have the advantages of high specific energy, no memory effect, long cycle life, and low environmental pollution, injecting fresh blood into the vigorous development of energy networks. Lithium-ion electric vehicles are an important part of the new energy vehicle family. As the "heart" of electric vehicles, high-energy-density lithium-ion power batteries can effectively overcome the problem of "mileage anxiety" in the field of electric vehicles. In recent years, the demand for lithium-ion power batteries has shown explosive growth. According to statist...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62H01M4/505H01M10/0525
CPCH01M4/505H01M4/628H01M10/0525H01M2004/021H01M2004/028Y02E60/10
Inventor 纪效波陈军侯红帅邹国强高旭尹首懿
Owner CENT SOUTH UNIV
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