Conductive polymer coated nickel-cobalt lithium aluminate cathode material and preparation method thereof

A conductive polymer, nickel cobalt lithium aluminate technology, applied in the direction of positive electrode, battery electrode, active material electrode, etc., can solve the problems of uneven coating, poor electrochemical performance, etc., to improve rate performance, reduce surface alkali performance, improve stability

Inactive Publication Date: 2018-09-04
SHAANXI COAL & CHEM TECH INST
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Problems solved by technology

[0004] Aiming at the problems of uneven coating and poor electrochemical performance of nickel-cobalt-lithium-aluminate materials in the prior art, the present invention provides a conductive polymer-coated nickel-cobalt-lithium-aluminate positive electrode material and a preparation method thereof, which effectively reduces the interfacial impedance , to improve the cycle stability of the material

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  • Conductive polymer coated nickel-cobalt lithium aluminate cathode material and preparation method thereof

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preparation example Construction

[0023] A preparation method of a nickel-cobalt-aluminum positive electrode material coated with a conductive polymer, comprising the following steps:

[0024] (1) Add sodium dodecylbenzenesulfonate into deionized water, stir for a certain period of time to make it completely dissolve, and configure it into a solution of 0.002-0.01g / mL;

[0025] (2) lithium nickel cobalt oxide powder (LiNi x co y Al 1-x-y o 2 , x≥0.8, y≥0.1) are dispersed in the solution obtained in step (1), so that the mass ratio of lithium nickel cobaltate powder to sodium dodecylbenzenesulfonate is (10-20):1, and the conductive polymer is added monomer and oxidizing agent, in-situ polymerization at 0-10°C for 4-10h, the conductive polymer monomer is one of aniline, pyrrole and thiophene, and the oxidizing agent is (NH 4 ) 2 SO 8 、K 2 Cr 2 o 7 、KIO 3 , FeCl 3 , FeCl 4 、H 2 o 2 , Ce(SO 4 ) 2 , MnO 2 and a kind of in BPO (benzoyl peroxide), and the mass ratio of conductive polymer monomer and ...

Embodiment 1

[0029] Weigh 0.33 g of sodium dodecylbenzene sulfonate and add it into deionized water, stir for a certain period of time to completely dissolve it, and prepare a 0.01 g / mL solution. Take by weighing 5g lithium nickel cobalt oxide powder (LiNi 0.8 co 0.15 Al 0.05 o 2 ) was dispersed in the above solution, after the dispersion was uniform, 0.1 g of aniline and 0.245 g of ammonium persulfate were added, and in-situ polymerization was carried out at 0° C. for 10 h. The solution was filtered, washed with deionized water and ethanol several times, and dried in vacuum at 100° C. for 20 hours to obtain a polyaniline-coated nickel-cobalt-lithium-aluminate positive electrode material.

[0030] Coating the prepared positive electrode material into a positive electrode sheet, electrolyte, diaphragm, nickel mesh, and lithium sheet negative electrode were assembled into a button battery for testing. For test results see figure 1 , at 0.1C, the first discharge specific capacity is 203m...

Embodiment 2

[0032] Weigh 0.4 g of sodium dodecylbenzene sulfonate and add it into deionized water, stir for a certain period of time to dissolve it completely, and prepare a solution of 0.002 g / mL. Take by weighing 8g lithium nickel cobalt oxide powder (LiNi 0.8 co 0.15 Al 0.05 o 2 ) is dispersed in the above solution, after the dispersion is uniform, add 0.024g of pyrrole and 0.145g of FeCl 3 , In situ polymerization at 5°C for 4h. The solution was filtered, washed with deionized water and ethanol several times, and dried in vacuum at 100° C. for 20 hours to obtain a polypyrrole-coated nickel-cobalt-lithium-aluminate positive electrode material.

[0033] Coating the prepared positive electrode material into a positive electrode sheet, electrolyte, diaphragm, nickel mesh, and lithium sheet negative electrode were assembled into a button battery for testing. At 0.1C, the first discharge specific capacity is 206mAh g -1 , efficiency 89.3%, 1C cycle discharge 185mAhg in the first cycle...

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Abstract

The invention discloses a conductive polymer coated nickel-cobalt lithium aluminate cathode material and a preparation method thereof. The composite material is prepared by dissolving sodium dodecylbenzenesulfonate in deionized water, dispersing nickel-cobalt lithium aluminate powder in the solution, then adding a conductive polymer monomer and an oxidizing agent, and performing in situ polymerization on the surface of nickel-cobalt lithium aluminate at a low temperature to obtain the conductive polymer coated nickel-cobalt lithium aluminate cathode material. According to the invention, a conductive polymer with good electron transport performance is used to coat nickel-cobalt lithium aluminate, so as to effectively reduce the impedance between material particles, and improve the cycle performance of the material; at the same time, through polymer coating, the direct contact between electrolyte and an active material is reduced, and thus the structural stability of the material is improved.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery cathode materials, in particular to a conductive polymer-coated nickel-cobalt-lithium-aluminate cathode material and a preparation method thereof. Background technique [0002] Lithium-ion batteries have become a new generation of green high-energy batteries due to their high operating voltage, large specific energy, light weight, small size, long cycle life, no memory effect, fast charge and discharge, and no environmental pollution. Applied in 3C products and new energy vehicles. Especially in recent years, the rapid development of the electric vehicle industry has put forward higher requirements for the energy density of batteries. Therefore, the development of a new generation of battery materials with high energy density has become a current research hotspot. [0003] Layered lithium nickel cobalt aluminate (NCA) cathode material LiNi x co y Al 1-x-y o 2 (x≥0.8, y≥0.1) is cur...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/525H01M4/485H01M4/62H01M10/0525
CPCH01M4/366H01M4/485H01M4/525H01M4/624H01M4/628H01M10/0525H01M2004/021H01M2004/028Y02E60/10
Inventor 寇亮张诚王夏阳张超王继锋田占元邵乐
Owner SHAANXI COAL & CHEM TECH INST
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