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Double-element doped lithium ion battery high-voltage positive electrode lithium nickel manganese oxide composite material and preparation method thereof, and lithium ion battery

A composite material, lithium nickel manganese oxide technology, applied in the direction of battery electrodes, secondary batteries, circuits, etc., can solve the problems that the metal elements cannot be mixed in equal proportions, and the rate performance is not greatly improved, so as to improve the battery cycle performance, Effects of improving material rate performance and improving cycle performance

Pending Publication Date: 2022-07-01
HAIKE GRP RES INST OF INNOVATION & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method can prepare aluminum-doped lithium nickel manganese oxide materials, this method can only improve the cycle performance of the material, and does not greatly improve its rate performance.
In addition, ball milling and solid-phase mixing were used many times in the preparation method, which could not guarantee the equal proportion mixing of metal elements

Method used

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  • Double-element doped lithium ion battery high-voltage positive electrode lithium nickel manganese oxide composite material and preparation method thereof, and lithium ion battery
  • Double-element doped lithium ion battery high-voltage positive electrode lithium nickel manganese oxide composite material and preparation method thereof, and lithium ion battery
  • Double-element doped lithium ion battery high-voltage positive electrode lithium nickel manganese oxide composite material and preparation method thereof, and lithium ion battery

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preparation example Construction

[0086] The invention provides a preparation method of a dual-element doped lithium nickel manganate composite material, comprising the following steps:

[0087] 1) after mixing soluble nickel salt, soluble manganese salt and water, obtain mixed salt solution;

[0088] After mixing a part of the mixed salt solution and the soluble chromium salt, a nickel-manganese-chromium solution is obtained;

[0089] After mixing another part of the mixed salt solution and the soluble aluminum salt, a nickel-manganese-aluminum solution is obtained;

[0090] Prepare mother liquor and precipitant solution;

[0091] 2) The nickel-manganese-chromium solution and the precipitant solution obtained by the above steps are added dropwise to the mother liquor, and the reaction is carried out to obtain a reaction system, and the nickel-manganese-aluminum solution and the precipitant solution are added dropwise in the reaction system again to continue the reaction, and then calcined, get the precursor...

Embodiment 1

[0156] (1) Preparation of metal mixed salt solution: Dissolve nickel acetate and manganese acetate in deionized water at a fixed ratio of 0.48:1.48 in molar ratio, and divide the completely dissolved nickel-manganese mixed salt solution into two parts, one part according to Chromium chloride was added in a fixed ratio of 0.48:1.48:0.2, and one part was added with aluminum chloride in a fixed ratio of 0.48:1.48:0.2, respectively. Wherein the prepared mixed salt solution concentration is 1mol / L;

[0157] (2) precipitant solution and mother liquor preparation: dilute the ammonia solution with deionized water until its pH is 8.5, prepare the system mother liquor, and be counted as solution C; simultaneously prepare the mixed solution of sodium carbonate and sodium hydroxide (Na 2 CO 3 : NaOH=3:1), which is regarded as solution D, and its concentration is 1 mol / L;

[0158] (3) Precipitation reaction: The solution A and the precipitant solution D are simultaneously dropped into th...

Embodiment 2

[0166] This embodiment 2 provides a method for preparing a high-voltage positive electrode material of chromium-doped lithium-ion battery lithium nickel manganate, which is the same as the preparation method provided in the above-mentioned embodiment 1, except that the nickel salt: manganese salt: chromium salt is set : The molar ratio of aluminum salt is 0.48:1.5:0.2:0, and other experimental conditions remain unchanged. After high temperature calcination, the molecular formula of LiNi can be prepared. 0.48 Mn 1.5 Cr 0.2 O 4 Chromium-doped lithium-ion battery high-voltage cathode lithium nickel manganate material.

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Abstract

The invention provides a double-element doped lithium nickel manganese oxide composite material. The double-element doped lithium nickel manganese oxide composite material comprises a lithium nickel manganese oxide material doped with an aluminum element and a chromium element, the chemical formula of the double-element doped lithium nickel manganese oxide composite material is shown as a formula (I). The composite material has a specific structure, the particle morphology of the composite material is a sphere-like morphology, the specific core-shell structure is adopted, and the spherical core is doped with chromium, so that the diffusion energy barrier of lithium ions can be reduced, and the rate capability of the material can be improved; the shell is doped with aluminum element, so that the crystal structure of the lithium nickel manganese oxide material can be stabilized, and the cycle performance of the material is improved. Meanwhile, the spherical morphology of the material has a lower specific surface area, direct contact between an electrode and an electrolyte can be reduced, and side reaction can be reduced, so that the lithium nickel manganese oxide material prepared by the method has excellent cycle performance and rate capability.

Description

technical field [0001] The invention belongs to the technical field of positive electrode materials for lithium ion batteries, and relates to a dual-element doped lithium nickel manganese oxide composite material and a preparation method thereof, as well as a lithium ion battery, and in particular to a dual-element doped lithium ion battery high-voltage positive electrode nickel manganese Lithium oxide composite material and preparation method thereof, and lithium ion battery. Background technique [0002] Lithium-ion batteries have the advantages of high operating voltage, high specific energy, long cycle life, light weight, less white discharge, no memory effect and high performance-price ratio, and have become rechargeable in high-power electric vehicles, satellites, aerospace and other fields. The main selection object of the power supply. Therefore, lithium-ion batteries and their related materials have become a research hotspot for researchers. The cathode material i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/505H01M4/525H01M10/0525
CPCH01M4/628H01M4/505H01M4/525H01M10/0525H01M2004/028H01M2004/021
Inventor 李宏亮鞠署元苗力孝
Owner HAIKE GRP RES INST OF INNOVATION & TECH
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