Method for preparing trivalent ion-doped lithium-rich solid solution cathode material

A cathode material, trivalent ion technology, applied in battery electrodes, electrical components, circuits, etc., can solve the problems of large precipitation solubility product, many preparation steps, increase hydroxide solubility, etc., to achieve a wide range of raw material sources, preparation The effect of simple process and excellent discharge performance

Active Publication Date: 2013-01-16
FUJIAN NORMAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patented method uses specific chemicals that can be used alone or together to create new types of batteries called Lithiated Liquid Cathodes (LCOC). These LCoS have unique properties such as stable structures even at very small sizes due to their highly charged cations attached to carbon atoms within them. They are also easy to make because they only require two different ingredients: one being magnesia powder while another containing certain elements like iron oxide. By adding these special substances into battery slurry solutions during production, it becomes possible to control the size distribution and improve its overall quality. Overall this technology allows for more efficient use of expensive resources and improved performance over existing technologies.

Problems solved by technology

This patented technical problem addressed in this patents relates to improving the efficient production of nanoceria composites from alkoxysulfonic acid compounds containing metal elements like iron and zinc. Previous methods involve multiple steps involving different starting substances that are time consuming processes and require expensive equipment.

Method used

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  • Method for preparing trivalent ion-doped lithium-rich solid solution cathode material
  • Method for preparing trivalent ion-doped lithium-rich solid solution cathode material

Examples

Experimental program
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Embodiment 1

[0034] According to lithium ion, nickel ion, manganese ion, cobalt ion, scandium ion, formic acid mol ratio is 1.325: 0.413 : 0.475 : 0.135: 0.015: 0.475 respectively take by weighing lithium carbonate, nickel carbonate, manganese carbonate, cobalt carbonate, Sc 2 O 3 and formic acid.

[0035] Nickel carbonate, manganese carbonate, cobalt carbonate and Sc to be weighed 2 O 3 Mixing, adding 10 times the volume of the total solid volume of deionized water, adding formic acid, wet grinding and mixing with an ordinary ball mill for 15 hours, then adding lithium carbonate, wet grinding and mixing for 15 hours to obtain precursor 1; Precursor 1 at 800 ℃, Precursor 2 was prepared by drying under the vacuum condition of 10132Pa pressure. The precursor 2 was placed in an air atmosphere, sintered at 550 ° C for 15 hours, and cooled to room temperature to obtain a precursor pre-sintered material; after pulverizing and passing through a 200-mesh sieve, the precursor pre-sintered materi...

Embodiment 2

[0038]According to the mol ratio of lithium ion, nickel ion, manganese ion, cobalt ion, aluminum ion, oxalic acid, it is 1.64: 0.02: 0.80: 0.0467: 0.06:0.93 to take by weighing basic lithium carbonate, basic nickel carbonate, basic manganese carbonate, Basic cobalt carbonate, Al 2 O 3 and oxalic acid.

[0039] Basic nickel carbonate, basic manganese carbonate, basic cobalt carbonate, Al 2 O 3 Mixing, adding 1 / 10 times the volume of the total solid volume of ethanol, adding oxalic acid, wet grinding and mixing with a super ball mill for 3 hours, then adding basic lithium carbonate, and mixing with a super ball mill for 3 hours to obtain precursor 1; 1 Prepare dry precursor 2 with a spray dryer at 110°C. The precursor 2 was placed in an oxygen-enriched air gas atmosphere with an oxygen volume content of 22%, sintered at 300 °C for 3 hours, and then placed in another sintering furnace at 1050 °C for 3 hours in an air atmosphere, the preparation composition was 0.60 Li 2 MnO...

Embodiment 3

[0042] According to lithium ion, nickel ion, manganese ion, cobalt ion, aluminum ion, acetic acid mol ratio is 1.55: 0.175: 0.70: 0.025: 0.075: 0.975 respectively take by weighing lithium hydroxide, nickel carbonate, manganese carbonate, basic cobalt carbonate, Al (OH) 3 , acetic acid.

[0043] Nickel carbonate, manganese carbonate, basic cobalt carbonate and Al(OH) to be weighed 3 Mixing, adding acetone 8 times the volume of the total solid volume, adding acetic acid, wet grinding and mixing with a wet mill for 15 hours, then adding lithium hydroxide, wet grinding and mixing with a wet mill for 15 hours to obtain precursor 1; at 80 ° C Precursor 2 was prepared by drying under the vacuum of 10132Pa pressure. The precursor 2 was placed in a pure oxygen atmosphere, sintered at 550 °C for 15 hours, and then placed in another sintering furnace at 800 °C for 24 hours in a pure oxygen atmosphere, the preparation composition was 0.50 Li 2 MnO 3 ·0.50 Li[Li 0.1 Ni 0.35 Mn 0.40 ...

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Abstract

The invention relates to a method for preparing trivalent ion-doped lithium-rich solid solution cathode material, which comprises the steps of: respectively weighing compounds of lithium, nickel, manganese and cobalt as well as compound M according to the molar ratio of (1.1+ 0.90* x):(1-x)* y:(1+z-x*z):(1-x)* k:(1-x)* q among lithium ionic, nickel ionic, manganese ionic, cobalt ionic and M ionic; mixing the weighed compounds of nickel, manganese and cobalt with the compound M; adding wet grinding medium and organic weak acid into the mixture; performing wet grinding, mixing and adding the compound of lithium; performing wet grinding and mixing; drying by a vacuum drying method or spray drying method; putting the product in the air, oxygen-rich gas or pure-oxygen gas; and finally, adopting a two-stage sintering method or two times of multi-step sintering method to prepare the lithium-rich solid solution cathode material. The prepared electrode material is uniform in composition, has excellent discharge property, and has better discharge cycle performance especially under the condition of large current.

Description

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Claims

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Application Information

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Owner FUJIAN NORMAL UNIV
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