Lithium ion battery composite cathode material LiNi1-x-yMxAlyO2 with core-shell structure and preparation method of lithium ion battery composite cathode material LiNi1-x-yMxAlyO2

A composite positive electrode material and lithium-ion battery technology, applied in battery electrodes, secondary batteries, structural parts, etc., can solve the problems of environmental moisture and carbon dioxide sensitivity, poor cycle stability and poor thermodynamic stability of nickel-rich positive electrode materials

Inactive Publication Date: 2016-10-26
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In order to solve the shortcomings of poor cycle stability, sensitivity to environmental moisture and carbon dioxide, and poor thermodynamic stability of nickel-rich cathode materials commonly found in the prior art, the present invention aims to provide a simple, easy-to-control, synthetic material Lithium-ion battery positive electrode material with good processing performance, storage performance and excellent electrochemical performance and preparation method thereof

Method used

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  • Lithium ion battery composite cathode material LiNi1-x-yMxAlyO2 with core-shell structure and preparation method of lithium ion battery composite cathode material LiNi1-x-yMxAlyO2
  • Lithium ion battery composite cathode material LiNi1-x-yMxAlyO2 with core-shell structure and preparation method of lithium ion battery composite cathode material LiNi1-x-yMxAlyO2
  • Lithium ion battery composite cathode material LiNi1-x-yMxAlyO2 with core-shell structure and preparation method of lithium ion battery composite cathode material LiNi1-x-yMxAlyO2

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Experimental program
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Effect test

Embodiment 1

[0062] Adopt publication number to be that the method described in CN103066257A synthesizes 5Kg Ni 0.815 co 0.15 Al 0.035 (OH) 2 Precursor (NCA precursor; SEM see figure 1 part a of ). Stop the reaction when the particle size distribution D50 of the product is 11.4-11.5 microns. Filter mother liquor to obtain NCA precursor (Ni 0.815 co 0.15 Al 0.035 (OH) 2 ). Add the NCA precursor to a 50L reaction kettle, add 30Kg of deionized water, stir for 30min at a stirring speed of 3m / s, and use sodium hydroxide to control pH=11.50, add 1.09L of 0.5mol / L sodium metaaluminate solution , and slowly add 0.2mol / L dilute sulfuric acid solution at a flow rate of 5ml / min until 9.0≤pH≤10 in the reactor; then after aging the acid-reacted slurry for 30min, filter the mother liquor, and use 60℃, 10 % sodium chloride solution for 30 minutes, the slurry was washed, filtered and dried to obtain Ni 0.815 co 0.15 Al 0.035 (OH) 2 / Al(OH) 3 (NCA precursor and Al(OH) 3 The molar ratio of c...

Embodiment 2

[0068] 5Kg Ni 0.9 co 0.1 (OH) 2 Precursor (SEM see image 3 Part a) was added to the 50L coated reactor. Add 30Kg of deionized water and stir for 30min at a stirring speed of 3m / s. Use sodium hydroxide to control pH = 11.50, add 2.16L of 0.5mol / L sodium metaaluminate solution, and feed CO at a flow rate of 300ml / min 2 Gas until the solution is 9.5≤pH≤10; then the acid-reacted slurry is aged for 30 minutes, the mother liquor is filtered, and the precipitate is washed with 30Kg 60°C deionized water, and the precursor is washed, filtered, and dried to obtain Ni 0.9 co 0.1 (OH) 2 / Al(OH) 3 (molar ratio is 100:2) composite precursor (SEM see image 3 Part b of ), it can be seen from the SEM image that the surface morphology of the precursor before and after aluminum coating is very different, and the Al(OH) 3 Distributed on the surface of spherical particles, a uniform aluminum hydroxide film is formed. Then Ni 0.9 co 0.1 (OH) 2 / 0.02Al(OH) 3 After being uniformly mix...

Embodiment 3

[0074] Take 5Kg Ni 0.8 co 0.2 (OH) 2 The precursor was added to the 50L coating reactor. Add 30Kg of deionized water and stir for 30min at a stirring speed of 4m / s. Use sodium hydroxide to control pH = 11.50, add 2.16L of 0.5mol / L sodium metaaluminate solution, and feed CO at a flow rate of 400ml / min 2 Gas until the solution is 9.5≤pH≤10; then, after aging the acidified slurry for 30 minutes, filter the mother liquor, and wash it with 60°C, 10% sodium chloride solution for 30 minutes, and the slurry is washed, filtered and dried to obtain Ni 0.80 co 0.20 (OH) 2 / Al(OH) 3 (molar ratio of 100:2) precursor. Then Ni 0.80 co 0.20 (OH) 2 / 0.02Al(OH) 3 After being uniformly mixed with the metered ratio of lithium hydroxide (Li / (Ni+M+Al) molar design ratio is 1), it was placed in an oxygen atmosphere furnace and calcined at 750°C for 12 hours and cooled to room temperature to obtain LiNi 0.784co 0.196 Al 0.02 o 2 Composite cathode material (LiAlO 2 Coated composite cat...

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Abstract

The invention discloses a lithium ion battery composite cathode material LiNi1-x-yMxAlyO2 with a core-shell structure and a preparation method of the lithium ion battery composite cathode material LiNi1-x-yMxAlyO2. The preparation method comprises the following steps that precursor powder is dispersed into a reaction still containing a base solution of a certain volume; a sodium metaaluminate solution is added into the reaction still, a precipitator is added at certain flow speed, the reaction conditions are controlled, and aluminum slowly deposits to the surface of the precursor powder; slurry is aged, washed and filtered, and a precursor with the core-shell structure is obtained after drying; the precursor and lithium salt are mixed to be uniform and calcined in oxygen shield to form the composite cathode material LiNi1-x-yMxAlyO2. The method has the advantages of being low in equipment requirement, easy to operate, environmentally friendly, high in element utilization rate, even in coating, good in product quality and the like.

Description

technical field [0001] The invention belongs to the technical field of lithium ion battery cathode material preparation, and relates to a lithium ion battery composite cathode material LiNi with a core-shell structure 1-x-y m x Al y o 2 method of preparation. Background technique [0002] The most prominent feature of nickel-based cathode materials is that it has the advantages of low price, low toxicity and high discharge specific capacity compared with lithium cobalt oxide, which is currently popular in the market. However, high-nickel-based cathode materials face the following problems that limit their commercial application: the synthesized high-nickel-based cathode materials are sensitive to ambient humidity and carbon dioxide; the reactivity of nickel-rich materials with acidic electrolytes leads to poor electrochemical and thermal stability of the materials. it is good. Therefore, designing a stable interface is an effective way to improve the storage performance...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/525H01M4/505H01M4/62H01M10/0525
CPCH01M4/362H01M4/505H01M4/525H01M4/62H01M10/0525Y02E60/10
Inventor 胡国荣彭忠东杜柯段建国
Owner CENT SOUTH UNIV
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