Lithium manganate composite positive electrode material, a preparing method thereof and a lithium-ion battery

A composite positive electrode material, lithium manganese oxide technology, applied in the field of lithium-ion batteries, can solve the problems of spinel-type lithium manganese oxide capacity decay fast, poor cycle stability, etc., to achieve good practical application and commercial promotion value, high specific capacity , Improve the effect of high temperature cycle stability

Active Publication Date: 2015-02-11
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to provide a lithium manganate composite positive electrode material, its preparation method and lithium ion battery to solve the problems of fast capacity decay of spinel lithium manganate and poor cycle stability at high temperature

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] The design scheme is LiMn 2 o 4 -LiNi 0.65 co 0.25 mn 0.15 o 2 , among them, nickel-rich concentration gradient type nickel-cobalt lithium manganese oxide LiNi 0.65 co 0.25 mn 0.15 o 2 The mass percent content is 15% of the total mass of the composite cathode material. The electrolytic manganese dioxide, nickel-rich concentration gradient nickel-cobalt-manganese carbonate precursor and lithium hydroxide were weighed according to the above ratio, mixed for 1 hour with a three-dimensional mixer, and then calcined in a muffle furnace at 850 °C for 8 hours, with a heating rate of 1°C / min, the entire calcination process is carried out in an oxygen atmosphere with a flow rate of 300ml / min, naturally cooled to room temperature, and after crushing and sieving, the in-situ composite of lithium manganate and nickel-rich concentration gradient nickel-cobalt lithium manganate is obtained The compound was added into 0.05mol / L dilute nitric acid solution and stirred to obtai...

Embodiment 2

[0057] The design scheme is LiMn 2 o 4 -LiNi 0.7 co 0.2 al 0.1 o 2 , among them, nickel-rich concentration gradient nickel-cobalt-aluminate LiNi 0.7 co 0.2 al 0.1 o 2 The mass percentage content is 10% of the total mass of the composite positive electrode material. The electrolytic manganese dioxide, nickel-rich concentration gradient type nickel-cobalt-aluminum hydroxide precursor and lithium hydroxide were weighed according to the above proportions, mixed for 10 hours with a three-dimensional mixer, and then calcined in a muffle furnace at 800 °C for 15 hours. The temperature is 5°C / min, and the whole calcination process is carried out in an oxygen atmosphere with a flow rate of 100ml / min, naturally cooled to room temperature, and after crushing and sieving, the in-situ lithium manganate and nickel-rich concentration gradient type nickel-cobalt aluminum oxide For the composite, the composite is added to 0.2mol / L dilute nitric acid solution and stirred to obtain a su...

Embodiment 3

[0060] The design scheme is LiMn 2 o 4 -LiNi 0.8 co 0.15 al 0.05 o 2 , among them, nickel-rich concentration gradient nickel-cobalt-aluminate LiNi 0.8 co 0.15 al 0.05 o 2 The mass percent content is 5% of the total mass of the composite cathode material. The electrolytic manganese dioxide, nickel-rich concentration gradient type nickel-cobalt-aluminum hydroxide precursor and lithium hydroxide were weighed according to the above proportions, and the mixture of deionized water and absolute ethanol was used as a solvent for ball milling in a high-energy ball mill for 8 hours. Calcined in a muffle furnace at 750°C for 20h, the heating rate is 10°C / min, the whole calcining process is carried out in an oxygen atmosphere with a flow rate of 150ml / min, naturally cooled to room temperature, after crushing and sieving, lithium manganate and rich The in-situ complex of nickel-cobalt-lithium-aluminate with gradient nickel concentration is added to 0.25mol / L dilute nitric acid sol...

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Abstract

The invention provides a lithium manganate composite positive electrode material, a preparing method thereof and a lithium-ion battery. The composite positive electrode material is of a core-shell structure. The inner layer of the composite positive electrode material is an in-situ composite of lithium manganate and nickel-rich concentration gradient type nickel cobalt manganese/lithium aluminate LiMn2O4-LiNi1-x-yCox(Al/Mn)yO2, wherein x is more than 0 and less than or equal to 0.25, and y is more than 0 and less than or equal to 0.15; the outer shell of the composite positive electrode material is a metal oxide coated layer. According to the lithium manganate composite positive electrode material and the preparing method thereof, the in-situ composite of lithium manganate and nickel-rich concentration gradient type nickel cobalt manganese/lithium aluminate is obtained after in-site sintering of a manganese source, a nickel-rich concentration gradient type nickel cobalt manganese/lithium aluminate precursor, and a lithium source, then shell-layer metal oxide is cladded by using spray drying, and finally the composite positive electrode material is obtained by combining a microwave sintering process. The composite positive electrode material provided by the invention has relatively high specific capacity, and excellent high temperature cycling and storage performances.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to lithium-ion battery positive electrode materials and lithium-ion battery preparation technology, in particular to a lithium manganate composite positive electrode material and a lithium-ion battery using the positive electrode material as a positive electrode active material. Background technique [0002] Lithium-ion batteries have many advantages such as high voltage, high energy density, good cycle performance, no memory effect, and low self-discharge. They are widely used in mobile power supplies, various portable electronic devices, high-end digital, electric vehicles and other fields. The corresponding cathode materials play a decisive role in the performance of lithium-ion batteries. For a long time, the development of cathode materials with excellent electrochemical performance, high capacity and good cycle performance has been a research hotspot in lithium-io...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/1391H01M4/362H01M4/505H01M4/525H01M4/62H01M10/0525H01M2004/028Y02E60/10
Inventor 徐宇兴高晓勇
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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