Electrode material, and preparation method and application thereof

A technology of electrode materials and positive electrode materials, applied in the field of electrode materials and their preparation, can solve the problem of high surface alkalinity and achieve the effect of stabilizing the evolution of lattice oxygen

Pending Publication Date: 2021-12-03
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] In view of the above-mentioned defects in the positive electrode materials in the prior art, one of the objects of the present invention is to provide a method for preparing an electrode material, the positive electrode material prepared by the method has good lattice stability and electrode / electrolyte interface stability at the same time It 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 positive electrode materials during cycling, and effectively overcoming the high surface alkalinity existing in existing positive electrode materials. , poor rate performance, severe cycle capacity and voltage attenuation, etc.

Method used

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  • Electrode material, and preparation method and application thereof
  • Electrode material, and preparation method and application thereof
  • Electrode material, and preparation method and application thereof

Examples

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preparation example Construction

[0045] The present invention aims to provide an electrode material, which has a micron-scale core-shell spherical structure, wherein the inner core is composed of positive electrode material, and the cladding layer is composed of amorphous Ni a mn b co c Composition B, where 0

[0046] S1. Dissolving the transition metal salt in absolute ethanol, stirring until the transition metal is completely dissolved, to obtain a solution;

[0047] S2, dissolving sodium borohydride in absolute ethanol, stirring until sodium borohydride is completely dissolved to obtain solution B;

[0048] S3. Dispersing the positive electrode material in the A solution prepared in step S1 to obtain a C solution;

[0049] S4. Under a protective atmosphere, slowly add the B solution prepared in step S2 to the C solution prepared in step S3; after the addition, stir to react;

[0050] S5, filte...

Embodiment 1

[0059] A preparation method of an electrode material, comprising the steps of:

[0060] Dissolve 0.52g of cobalt nitrate hexahydrate in 200mL of absolute ethanol solution and stir for 2 hours to obtain solution A; dissolve 0.59g of sodium borohydride in 200mL of absolute ethanol solution and stir for 2 hours to obtain solution B; The base cathode material was added to solution A and stirred for 3 hours to obtain solution C; during the stirring process, argon gas was continuously introduced to fill the reaction vessel with argon, and solution B was slowly added to solution C through a constant flow pump at a feed rate of 1mL / min, after feeding, keep stirring for 12 hours, and keep ventilating during the stirring process; after stirring, filter and wash 3 times with absolute ethanol; then dry in a vacuum oven at 100°C for 12 hours to obtain coated modified Lithium-rich manganese-based cathode material, named CB-LRM.

[0061] After testing, the structure of the cladding layer i...

Embodiment 2

[0065] A preparation method of an electrode material, comprising the steps of:

[0066] Dissolve 0.52g of cobalt nitrate hexahydrate in 200mL of absolute ethanol solution and stir for 2 hours to obtain solution A; dissolve 0.59g of sodium borohydride in 200mL of absolute ethanol solution and stir for 2 hours to obtain solution B; The base cathode material was added to solution A and stirred for 3 hours to obtain solution C; during the stirring process, argon gas was continuously introduced to fill the reaction vessel with argon, and solution B was slowly added to solution C through a constant flow pump at a feed rate of 1mL / min, after feeding, keep stirring for 2 hours, and keep ventilating during the stirring process; after stirring, use absolute ethanol to filter and wash 3 times; then put it in a vacuum drying oven at 100°C for 12 hours to obtain coated modified Lithium-rich manganese-based cathode materials.

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Abstract

The invention provides an electrode material, and a preparation method and application thereof. The preparation method comprises the following steps: respectively dissolving a transition metal salt solution and sodium borohydride in absolute ethyl alcohol to obtain a solution A and a solution B, dispersing a positive electrode material in the solution A to obtain a solution C, slowly adding the solution B into the solution C in a protective gas atmosphere, stirring for reaction after charging is finished, and then filtering, washing and drying to obtain the electrode material. The electrode material has good lattice stability and electrode / electrolyte interface stability at the same time, lattice oxygen loss in the circulation process can be inhibited, and dissolution and migration of transition metal can be inhibited, so that capacity attenuation and voltage drop of the positive electrode material in the circulation process are relieved, and the problems of high surface alkalinity, poor rate capability, serious attenuation of capacity and voltage in the cycle process and the like of the existing positive electrode material are effectively solved.

Description

technical field [0001] The present invention relates to the field of electrode materials, more specifically, to an electrode material and its preparation method and application. 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 statistics, the cumulative output of power batteries in my country in 2019 was 85.4GWh, a cumulative increase of 21% compared with the same period in 2018. High energy ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/52H01M10/0525H01M4/13
CPCH01M10/0525H01M4/13H01M4/36H01M4/523Y02E60/10
Inventor 纪效波陈军侯红帅邹国强邓文韬梅雨
Owner CENT SOUTH UNIV
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