Rubidium-doped high-rate lithium battery positive electrode material and preparation method thereof

A cathode material, lithium battery technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problem of low charging rate of lithium batteries, and achieve the effect of promoting lithium ion conduction, improving charging rate performance and discharge capacity

Inactive Publication Date: 2020-11-17
光鼎铷业(广州)集团有限公司
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Problems solved by technology

[0004] Aiming at the technical problem of low charging rate of lithium batteries in the above-mentioned prior art, the present invention proposes a rubidium-doped high-rate lithium battery positive electrode material and a preparation method thereof, by selecting rubidium / cesium ion doping to replace part of lithium ions to form a large-aperture Ion channels to promote lithium ion conduction and improve the charging rate performance of lithium batteries

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  • Rubidium-doped high-rate lithium battery positive electrode material and preparation method thereof

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Embodiment 1

[0024] A method for preparing a rubidium-doped high-rate lithium battery positive electrode material, the specific steps are as follows:

[0025] Step 1: Uniformly mix 50 parts of lithium cobaltate, 1 part of rubidium carbonate, and 0.5 part of cesium carbonate according to the mass parts, and place them in a tube furnace for calcination at a high temperature of 600°C for 10 hours to obtain a precursor material;

[0026] Step 2: Anneal the precursor material after high-temperature calcination in step 1, and then mix 10 parts of 2wt% polyamide solution (using N-methylpyrrolidone as solvent), 3 parts of conductive Nano-carbon material (the consumption of carbon nanotube and conductive carbon black is respectively 0.02wt%, 0.6wt% of positive electrode active material lithium cobalt oxide quality; Wherein the diameter of carbon nanotube is about 2nm, and length is about 2um, and the amount of conductive carbon black Specific surface at 50m 2 / g, the particle size is about 10nm), ...

Embodiment 2

[0032] A method for preparing a rubidium-doped high-rate lithium battery positive electrode material, the specific steps are as follows:

[0033] Step 1: Mix 80 parts of lithium manganate and lithium nickel cobalt aluminate mixture (mass ratio 1:1), 5 parts of rubidium hydroxide, and 2 parts of cesium bicarbonate according to the mass parts, and place them in a tube furnace Calcining at 1000° C. for 5 hours to obtain the precursor material.

[0034] Step 2: Anneal the precursor material after high-temperature calcination in step 1, and then mix 20 parts of 5 wt% polyvinylpyrrolidone solution (using N-methylpyrrolidone as the solvent), 5 parts Conductive nano-carbon material (the consumption of carbon nanotube and conductive carbon black is respectively 0.04wt% and 1wt% of the total mass of positive electrode active material lithium manganate and nickel-cobalt-aluminate lithium mixture; wherein the diameter of carbon nanotube is about 7nm, length It is about 15um, and the spec...

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Abstract

The invention discloses a rubidium-doped high-rate lithium battery positive electrode material and a preparation method thereof, and the preparation method comprises the following steps: S1) uniformlymixing a positive electrode active substance, a rubidium compound and a cesium compound, and calcining for 5-10h at the temperature of 600-1000 DEG C to obtain a precursor material; S2) performing annealing treatment on the precursor material subjected to high-temperature calcination, then mixing a coating agent and a conductive nano carbon material, and grinding in a ball mill for 0.5-2 h to obtain a lithium battery positive electrode material; and S3) adding a conductive agent and a binder into the lithium battery positive electrode material prepared in the step S2), blending, and carryingout ultrasonic treatment for 2-4h to obtain the lithium battery positive electrode material slurry. Rubidium / cesium ions are doped to replace part of lithium ions to form a large-aperture ion channel,so that lithium ion conduction is promoted, and the charging rate performance and the discharging capacity of a lithium battery are remarkably improved.

Description

technical field [0001] The invention belongs to the field of lithium battery material preparation, and in particular relates to a rubidium-doped high-rate lithium battery cathode material and a preparation method thereof. Background technique [0002] Lithium-ion batteries are more and more widely used in electric and hybrid electric vehicles because of their advantages such as high working voltage, large specific energy, light weight, small size, long cycle life, no memory effect, fast charging and discharging, and low environmental pollution. And other new energy vehicles are currently the most attention-grabbing energy storage methods. [0003] In order to improve the stability of lithium battery materials, the main methods are to coat a layer of ceramics and element doping on the surface of the material. For example, patent CN109585839A discloses a material preparation method of alumina-coated ternary positive electrode. By coating a layer of alumina coating on the surf...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/62H01M4/139H01M10/0525
CPCH01M4/364H01M4/625H01M4/139H01M10/0525Y02E60/10
Inventor 唐浩林王仲明陈智伟陈志华詹心泉
Owner 光鼎铷业(广州)集团有限公司
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