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Single-crystal lithium nickel manganese cobalt positive electrode material, preparation method thereof and lithium ion battery

A technology of nickel-cobalt-lithium-manganese-manganate and cathode materials, which can be used in battery electrodes, secondary batteries, circuits, etc., and can solve the problems of low rate performance and low capacity

Active Publication Date: 2017-03-15
NINGBO RONBAY LITHIUM BATTERY MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the cycle performance of the material can be improved by making the ternary material into a single crystal morphology, its capacity is low and the rate performance is far lower than that of the secondary particle.

Method used

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  • Single-crystal lithium nickel manganese cobalt positive electrode material, preparation method thereof and lithium ion battery
  • Single-crystal lithium nickel manganese cobalt positive electrode material, preparation method thereof and lithium ion battery
  • Single-crystal lithium nickel manganese cobalt positive electrode material, preparation method thereof and lithium ion battery

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preparation example Construction

[0052] The present invention also provides a method for preparing the above-mentioned single crystal nickel cobalt lithium manganese oxide positive electrode material, comprising the following steps:

[0053] S1) Mix and react nickel salt, cobalt salt, manganese salt, alkali and complexing agent to obtain nickel cobalt manganese hydroxide precursor; The molar ratio is x:y:(1-x-y); 0.3≤x≤0.75, 0.2≤y≤0.3;

[0054] S2) Mix and sinter the nickel-cobalt-manganese hydroxide precursor and the first lithium salt to obtain a substrate; the molar ratio of lithium ions in the first lithium salt to nickel ions in the nickel-cobalt-manganese hydroxide precursor is: 1: x;

[0055] Or the nickel-cobalt-manganese hydroxide precursor, the first lithium salt and the M-containing compound are mixed and sintered to obtain the substrate; M is Ti, Mg, Al, V, Cr, Zr, Ba, La, Ce, Sn elements One or more; the molar ratio of lithium ions in the first lithium salt, nickel ions in the nickel-cobalt-man...

Embodiment 1

[0076] 1.1 Dissolve nickel sulfate, cobalt sulfate, and manganese sulfate in deionized water at a molar ratio of Ni, Co, and Mn of 1:1:1 to prepare a mixed salt solution with a total metal cation concentration of 1mol / L, and stir to make it fully Mix well to obtain a mixed salt solution.

[0077] 1.2 Prepare 5mol / L sodium hydroxide solution and 5mol / L ammonia water respectively, then pump the prepared mixed salt solution into the reaction kettle at a rate of 150L / h and stir, while controlling the sodium hydroxide and ammonia water The flow rate of the aqueous solution is such that the PH value of the mixed solution is 10.5, and the temperature of the reaction kettle is controlled at 50°C during the process; the stirring speed is 300rpm, and the mixed salt solution to be prepared is completely added to the reaction kettle, then continues to stir and age for 16h, and then the obtained The solid-liquid mixture was separated by centrifugal filtration, the solid was washed with dei...

Embodiment 2

[0084] 2.1 Dissolve nickel nitrate, cobalt nitrate, and manganese nitrate in deionized water at a molar ratio of Ni, Co, and Mn of 5:2:3 to prepare a salt solution with a total metal cation concentration of 1.6mol / L, and stir to fully Mix well to obtain a mixed salt solution.

[0085] 2.2 Prepare 4mol / L sodium hydroxide solution and 4mol / L ammonia water respectively, then pump the prepared mixed salt solution into the reaction kettle at a rate of 160L / h and stir it, while controlling the sodium hydroxide and ammonia water The flow rate of the aqueous solution is such that the pH value of the mixed solution is 11.2, and the temperature of the reaction kettle is controlled at 60°C during the process; the stirring speed is 400rpm. After all the salt solution to be prepared is added to the reaction kettle, continue to stir and age for 16h, and then the obtained solid-liquid mixture After separation by centrifugal filtration, the solid was washed with deionized water until neutral,...

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Abstract

The invention provides a single-crystal lithium nickel manganese cobalt positive electrode material. The single-crystal lithium nickel manganese cobalt positive electrode material comprises a substrate, wherein the substrate is a compound shown as a formula I of LiNi<x>Co<y>Mn<1-x-y>M<z>O<2>, x is more than or equal to 0.3 but less than or equal to 0.75, y is more than or equal to 0.2 but less than or equal to 0.3, z is more than or equal to 0 but less than or equal to 0.1, and a coating layer is coated on a surface of the substrate and is one or more of Li2ZrO3, Li2SnO3, LiNbO3, Li4Ti5O12 and LiAlO2. Compared with the prior art, a fast ion conductor is coated on the surface, thus, the rate performance of a single-crystal material is improved, the gram capacity of the single-crystal material is improved, the cycle performance of the material is further improved, the internal resistance can also be reduced, the polarization loss is reduced, and the cycle lifetime of a battery is prolonged; and meanwhile, the advantage of large compaction of a single-crystal ternary material is maintained, a particle broken phenomenon caused by rolling particles similar to secondary particles during battery fabrication can be prevented due to relatively high compaction, and the cycle performance is improved.

Description

technical field [0001] The invention relates to the technical field of positive electrode materials, in particular to a single crystal nickel cobalt lithium manganese oxide positive electrode material, a preparation method thereof and a lithium ion battery. Background technique [0002] As a new type of green power supply, lithium-ion batteries have the advantages of high specific energy, small self-discharge, high open circuit voltage, no memory effect, long cycle life, and no environmental pollution. Therefore, they are widely used as mobile phones, notebook computers, digital cameras, etc. At the same time, lithium-ion batteries are also energy storage power sources for electric vehicle power and solar renewable energy. [0003] Currently, the limiting factor of lithium-ion batteries is the accompanying capacity fading during cycling and the resulting poor cycle life. The reason for the capacity fading is that on the one hand, the intrinsic structure of the positive elec...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/525H01M10/0525H01M4/36H01M4/48
CPCH01M4/366H01M4/48H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 戚洪亮佘圣贤李勇华徐杰黄连友朱永波袁徐俊
Owner NINGBO RONBAY LITHIUM BATTERY MATERIAL CO LTD
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