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Composite multi-element lithium ion battery cathode material and preparation method thereof

A technology for lithium-ion batteries and cathode materials, applied in battery electrodes, secondary batteries, circuits, etc., to achieve the effects of reducing losses, improving cycle life, and reducing surface tension

Active Publication Date: 2014-07-16
成都云津能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, with the increase of cut-off voltage, the cycle performance of ternary materials needs to be improved urgently.

Method used

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  • Composite multi-element lithium ion battery cathode material and preparation method thereof
  • Composite multi-element lithium ion battery cathode material and preparation method thereof
  • Composite multi-element lithium ion battery cathode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Li 1+0.03 Ni 0.5 co 0.2 mn 0.3 al 0.03 o 2+0.06 Preparation of cathode material:

[0025] Aluminum nitrate is dissolved in aqueous solution and is made into 1M solution; Add Ni in this solution 0.5 co 0.2 mn 0.3 (OH) 2 The precursor forms a suspension; under the conditions of 25°C water bath and strong stirring, adjust the pH value to 10.0 with 1M ammonia water, and continue stirring for 2 hours; after stopping the stirring, dry the final suspension to obtain the coated precursor; The precursor and Li 2 CO 3 Li was prepared by sintering at 850°C for 10 hours after batching with an excess of 5% Li and drying. 1+0.03 Ni 0.5 co 0.2 mn 0.3 A1 0.03 o 2+0.06 Cathode material. Test the XRD and transmission electron microscope of the ternary material according to conventional methods in the field; test the electrochemical performance of the material by making a button battery. The battery manufacturing and testing formats are as follows:

[0026] The coated p...

Embodiment 2

[0028] Li 1+0.01 Ni 0.5 co 0.2 mn 0.3 Ti 0.01 o 2+0.02 Preparation of cathode material:

[0029] will Ni 0.5 co 0.2 mn 0.3 (OH) 2 Front drive press Li 1+0.01 Ni 0.5 co 0.2 mn 0.3 Ti 0.01 o 2+0.02Add 20g / L of butyl titanate ethanol solution to form a suspension in the medium metering ratio; under the conditions of 25°C water bath and strong stirring, slowly add 2 times the above volume of ethanol solution (20vol1%) containing deionized water Add it dropwise to the above-mentioned suspension, and continue to stir and react for 2 hours; after stopping the stirring, dry the final obtained suspension to obtain a coated precursor; the precursor and lithium hydroxide are formulated according to an excess of 12% Li and dried at 950 Li was prepared by sintering at high temperature for 7 h 1+0.01 Ni 0.5 co 0.2 mn 0.3 Ti 0.01 o 2+0.02 Cathode material. According to the method in Example 1, the XRD, transmission electron microscope, and electrochemical performance of...

Embodiment 3

[0032] Li 1+0.05 Ni 0.5 co 0.2 mn 0.3 Zr 0.05 0 2+0.1 Preparation of cathode material:

[0033] will Ni 0.5 co 0.2 mn 0.3 (OH) 2 Front drive press Li 1+0.05 Ni 0.5 co 0.2 mn 0.3 Zr 0.05 o 2+0.1 Add 20g / L zirconium nitrate aqueous solution in a metered ratio to form a suspension; slowly add 1M ammonium bicarbonate dropwise to the above suspension under the conditions of 40°C water bath and strong stirring, and continue to stir for 1h; stop After stirring, the final suspension was dried to obtain a precursor coated with zirconium carbonate; the precursor and lithium salt (90% lithium carbonate + 10% lithium acetate) were formulated according to an excess of 3% Li and dried at 780 ° C. Li was prepared by sintering at high temperature for 22 h 1+0.05 Ni 0.5 co 0.2 mn 0.3 Zr 0.05 o 2+0.1 Cathode material. According to the method in Example 1, the XRD of the ternary material and the electrochemical performance of the material were tested.

[0034] Electrochemi...

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Abstract

A nickel cobalt lithium manganate cathode material has a capability that lithium ions in structure can be removed continuously under high voltage, but the cycle performance of the material needs to be improved urgently along with the boost of a cut-off voltage. The invention provides a composite multi-element lithium ion battery cathode material and a preparation method thereof, the composite multi-element lithium ion battery cathode material has the chemical formula of Li1+zNi1-x-yCoxMnyMzO2+2z, wherein x is more than 0, y is less than 1, and z is more than 0 and less than 0.2; in the chemical formula, M is a composite metal or non-metal and comprises one or more out of Al, Si, Zn, Zr, Ti, Sn and Mg; the physical composition of the composite multi-element lithium ion battery cathode material adopts a layered LiNi1-x-yCoxMnyO2 as a core and is covered with a layer of LiMO2 with the same layered structure, and meanwhile, part of the LiMO2 penetrates to the structure of the LiNi1-x-yCoxMnyO2, and gradient adulteration from less to more is formed from inside to outside.

Description

technical field [0001] The invention belongs to the technical field of positive electrode materials of lithium ion batteries, in particular to a composite multi-element lithium ion battery positive electrode material and a preparation method thereof. Background technique [0002] Lithium-ion batteries are widely used in mobile phones, notebook computers, power tools and digital products because of their advantages such as high working voltage, high volumetric energy density and no memory effect. In recent years, with the intelligentization, miniaturization and multi-functionalization of various electronic products, higher requirements have been put forward for the volume energy density of lithium-ion batteries to meet the needs of longer standby time. [0003] The ternary nickel-cobalt lithium manganate cathode material has the ability to continue to extract lithium ions in the structure under high voltage, so increasing the charging voltage of the battery can significantly ...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/525
CPCH01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 张云
Owner 成都云津能源科技有限公司
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