Method for preparing ternary cathode material of rubidium-doped lithium ion battery

A lithium-ion battery, ternary material technology, applied in battery electrodes, electrical components, circuits, etc., can solve the problems of inaccurate measurement and dry mixing, and achieve uniform distribution, regular morphology, and improve production efficiency.

Pending Publication Date: 2019-11-01
深圳市新创材料科技有限公司
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Problems solved by technology

[0007] The purpose of the present invention is to solve the above-mentioned problems in the process of rubidium doping, such as the inability to accurately measure, the inability to dry mix, and the mixing of organic solvents as media, and propose a new rubidium doping preparation Lithium-ion battery ternary cathode material method

Method used

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  • Method for preparing ternary cathode material of rubidium-doped lithium ion battery
  • Method for preparing ternary cathode material of rubidium-doped lithium ion battery
  • Method for preparing ternary cathode material of rubidium-doped lithium ion battery

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Embodiment 1

[0027] About 1g of rubidium carbonate was roughly weighed and dissolved in 9ml of pure water to obtain aqueous solution A of rubidium. The rubidium carbonate content of solution A was tested by ICP to be 9.6%. Weigh 56.4g NCM622 precursor (Ni 0.6 co 0.2 mn 0.2 (OH) 2 ) Add 5g of aqueous solution A, and add 51.4ml of pure water to adjust the solid-liquid ratio to 50%, to obtain solid-liquid mixture B. The solid-liquid mixture B was continuously stirred at 105 °C until the water was completely evaporated to dryness, and a uniformly mixed powder C of rubidium carbonate and NCM622 precursor was obtained. Weigh 23g of lithium carbonate and powder C, mix them uniformly in a ball mill, and then sinter at 900°C for 16 hours to obtain a rubidium-doped NCM622 positive electrode material.

Embodiment 2

[0035] Roughly weigh about 0.5g of rubidium carbonate and dissolve it in 9.5ml of pure water to obtain aqueous solution A of rubidium. The content of rubidium carbonate in solution A is 4.5% by ICP: Weigh 55.5g NCM811 precursor (Ni 0.8 co 0.1 mn 0.1 (OH) 2 ) Add 5g of aqueous solution A, and add 25ml of pure water to adjust the solid-liquid ratio to 65%, to obtain solid-liquid mixture B. The solid-liquid mixture B was continuously stirred at 115 °C until the water was completely evaporated to dryness, and a uniformly mixed powder C of rubidium carbonate and NCM811 precursor was obtained. Weigh 25.94g of lithium hydroxide and powder C, mix them uniformly in a ball mill, and then sinter at 750°C for 16 hours to obtain a rubidium-doped NCM811 positive electrode material.

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Abstract

The invention discloses a method for preparing a ternary cathode material of a rubidium-doped lithium ion battery. The method comprises the following steps of: weighing an appropriate amount of rubidium carbonate as a rubidium source and dissolving the rubidium carbonate in pure water to obtain an aqueous solution of rubidium, according to the doping amount of rubidium being in a range of 0.1%-1%(wt%), calculating the desired ternary material precursor, adding the ternary material precursor into the aqueous solution of rubidium, and adding pure water to a suitable solid content; evaporating and drying the above solid-liquid mixture to obtain mixed rubidium powder B; and mixing the mixed rubidium powder B with a lithium source, and performing high-temperature sintering, crushing and iron removal and sieving to obtain a ternary material of a rubidium-doped lithium ion battery. The method for preparing a ternary cathode material of a rubidium-doped lithium ion battery does not need an organic solution, is high in production efficiency, uniform in distribution of the rubidium of the ternary material and regular in shape.

Description

technical field [0001] The invention relates to the technical field of ternary cathode materials for lithium-ion batteries, in particular to a preparation method for rubidium-doped lithium-ion battery ternary cathode materials. Background technique [0002] With the promotion of national policies and the large-scale application of lithium-ion battery ternary cathode materials in digital and electric vehicles, ternary cathode materials are favored. Conventional ternary materials cannot be used in many fields. At present, the performance of ternary materials used in the field of power batteries is basically improved by means of doping and coating, and rubidium doping is one of them. [0003] At present, general element doping, such as magnesium doping, etc., because its sulfate is soluble in water and hydroxide is insoluble in water, can be added during the precursor reaction process, so that it can be evenly distributed in the precursor body, and the doped Heterotype precurs...

Claims

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Application Information

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IPC IPC(8): H01M4/36
CPCH01M4/364Y02E60/10
Inventor 王伟东丁倩倩关豪元张芳
Owner 深圳市新创材料科技有限公司
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