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Composite metallic-oxide-cladded lithium nickel cobalt manganese oxide anode material and preparation method thereof

A technology of nickel-cobalt-manganese oxides and composite metals, applied in battery electrodes, electrical components, circuits, etc., can solve problems such as failure to meet performance requirements, limit practical applications, and low discharge specific capacity, so as to improve electrochemical cycle performance and Discharge specific capacity, large-scale industrial production, and simple process

Inactive Publication Date: 2011-11-16
LIAONING UNIVERSITY OF PETROLEUM AND CHEMICAL TECHNOLOGY
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  • Abstract
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  • Application Information

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Problems solved by technology

However, the coating material needs to be synthesized in ethanol, which increases the production cost and limits its practical application.
In ElectrochimicaActa, 2006, 52:1316-1322, Kim et al. adopted C 9 h 21 o 3 Synthesis of Al from Al in Ethanol 2 o 3 coated LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 Positive electrode material, studies have shown that the surface is coated with LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 The positive electrode material can work at a high charge cut-off voltage and has good cycle performance, but its discharge specific capacity is low
[0005] The above method has a certain effect on improving the electrochemical performance of lithium nickel cobalt manganese oxide, especially the electrochemical performance at a higher charge cut-off voltage, but it still cannot meet people's performance requirements for this material

Method used

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  • Composite metallic-oxide-cladded lithium nickel cobalt manganese oxide anode material and preparation method thereof
  • Composite metallic-oxide-cladded lithium nickel cobalt manganese oxide anode material and preparation method thereof
  • Composite metallic-oxide-cladded lithium nickel cobalt manganese oxide anode material and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Embodiment 1: 30 grams of LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 Add it into 150mL deionized water, and obtain a suspension under mechanical stirring; slowly add 40mL of 0.22mol / L Co(NO 3 ) 2 and 0.11mol / LAl(NO 3 ) 3 Mixed salt solution, while adding dropwise 0.3mol / L LiOH solution to keep the pH value of the suspension at 10.5; when the mixed salt solution was added dropwise, continue to stir for 30 minutes; filter the suspension, and the filter cake was Dry at 100°C for 12 hours and grind; heat up the ground powder to 400°C at a rate of 5°C / min and keep the temperature constant for 5 hours, then cool naturally to room temperature to obtain the product of the present invention.

[0031] The content of metal ions Li, Ni, Co, Mn, Al in the product was measured by Japan Shimao ICPS-7500 inductively coupled plasma emission spectrometer, and Co was LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 1.73% by mass, Al as LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 0.40% of mass. X-ray powder diffractometer (Cu K ...

Embodiment 2

[0033] Embodiment 2: 40 grams of LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 Add it into 100mL deionized water, and obtain a suspension under mechanical stirring; slowly add 30mL of 0.129mol / L CoSO 4 and 0.0646mol / L Al(NO 3 ) 3 Add the mixed salt solution of 0.2mol / L LiOH solution dropwise at the same time to keep the pH value of the suspension at 11; when the mixed salt solution is added dropwise, continue to stir for 60 minutes; filter the suspension and filter the cake in Dry at 120°C for 6 hours and grind; heat up the ground powder to 450°C at a rate of 2°C / min and keep the temperature constant for 5 hours, then cool naturally to room temperature to obtain the product of the present invention.

[0034] ICP and XRD ( figure 1 b) The test shows that the product is LiNi coated with cobalt-aluminum composite metal oxide 1 / 3 co 1 / 3 mn 1 / 3 o 2 , and Co is LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 0.57% by mass, Al as LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 0.13% of the mass, with a single layered structur...

Embodiment 3

[0035] Embodiment 3: 50 grams of LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 Add it into 400mL deionized water, and obtain a suspension under mechanical stirring; slowly add 50mL of 0.500mol / L Co(NO 3 ) 2 and 0.250mol / L Al(NO 3 ) 3 Add the mixed salt solution of 1.0mol / L LiOH solution dropwise at the same time to keep the pH value of the suspension at 11.5. After the dropwise addition of the mixed salt solution is completed, continue to stir for 80 minutes; filter the suspension and filter the cake in Dry at 80°C for 10 hours and grind; heat up the ground powder to 500°C at a rate of 10°C / min and keep the temperature constant for 8 hours, then cool naturally to room temperature to obtain the product of the present invention.

[0036] ICP and XRD ( figure 1 d) The test shows that the product is LiNi coated with cobalt-aluminum composite metal oxide 1 / 3 co 1 / 3 mn 1 / 3 o 2 , and Co is LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 2.95% by mass, Al as LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 0.67% of the mass, w...

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Abstract

The invention discloses a composite metallic-oxide-cladded lithium nickel cobalt manganese oxide anode material and a preparation method thereof. One metallic element in the composite metallic oxide in the anode material is Al of which the mass is 0.02%-0.92% of that of the lithium nickel cobalt manganese oxide; and the other metallic element in the composite metallic oxide in the anode material is one selected from transition metal Co or Zn, and the mass of the other metallic element is 0.2%-4.0% of that of the lithium nickel cobalt manganese oxide. The composite metallic-oxide-cladded lithium nickel cobalt manganese oxide anode material can be used to exert the respective advantages of the two metallic oxides and the synergy effect between the two metallic oxides sufficiently, thus improving the electrochemical cycle performance and the specific discharge capacity of the anode material under the condition of higher charge cut-off voltage obviously. The preparation method comprises the following steps: forming a hydrotalcite precursor layer on the surface of the lithium nickel cobalt manganese oxide firstly; and roasting to obtain the composite metallic-oxide-cladded lithium nickel cobalt manganese oxide anode material, thus ensuring the uniform distribution of two kinds of metallic ions in the hydrotalcite precursor and the oxide cladding layer of the final product, thereby exerting the best cladding effect.

Description

1. Technical field [0001] The invention belongs to the technical field of lithium-ion battery cathode materials and preparation thereof, and in particular relates to a composite metal oxide-coated lithium-nickel-cobalt-manganese oxide cathode material and a preparation method. 2. Background technology [0002] Lithium-ion batteries have the advantages of high working voltage, high energy density, long cycle life, no memory effect and relatively "friendly" to the environment, and have been widely used in portable electronic products (such as mobile phones, digital cameras, notebook computers, etc.) and Power tools and electric vehicles and other fields. Lithium nickel cobalt manganese oxide (Li x Ni y co 1-y-z mn z o 2 (0.9<x<1.1, 0<y<0.5, 0<z<0.5)) better combines the advantages of lithium cobalt oxide, lithium nickel oxide and lithium manganese oxide, with high specific capacity and stable cycle performance And other characteristics, so it has very b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/525H01M4/505H01M4/1391
CPCY02E60/122Y02E60/12Y02E60/10
Inventor 杨占旭邱泳锋乔庆东
Owner LIAONING UNIVERSITY OF PETROLEUM AND CHEMICAL TECHNOLOGY
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