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Polyaniline microrod structure lithium-rich manganese-based positive electrode material as well as preparation method and application thereof

A lithium-rich manganese-based, cathode material technology, applied in the direction of positive electrodes, structural parts, battery electrodes, etc., can solve the problems of low rate performance, large irreversible capacity loss at the first charge and discharge, low cycle stability, etc., to suppress conduction. rate, excellent rate performance and cycle stability, and the effect of simplifying the process flow

Pending Publication Date: 2022-05-24
GUANGZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, there are still many problems in lithium-rich manganese-based oxide cathode materials: (1) large irreversible capacity loss during the first charge and discharge; (2) low cycle stability, and the voltage plateau decays during the cycle; (3) poor rate performance high

Method used

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  • Polyaniline microrod structure lithium-rich manganese-based positive electrode material as well as preparation method and application thereof
  • Polyaniline microrod structure lithium-rich manganese-based positive electrode material as well as preparation method and application thereof
  • Polyaniline microrod structure lithium-rich manganese-based positive electrode material as well as preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0062] A polyaniline microrod structure lithium-rich manganese-based cathode material, the mass fraction of polyaniline coating is 0.5%, and the chemical formula of the synthetic target lithium-rich manganese-based oxide is Li 1.2 Ni 0.13 Co 0.13 Mn 0.54 O 2 @0.5%PANI-HTFSI.

[0063] The preparation method of the above-mentioned polyaniline micro-rod structure lithium-rich manganese-based positive electrode material comprises the following steps:

[0064] Weigh 0.110mol of lithium acetate dihydrate (CH 3 COOLi·2H 2 O), 0.023 mol of cobalt acetate tetrahydrate (Co(CH) 3 COO) 2 ·4H 2 O), 0.023mol nickel acetate tetrahydrate (Ni(CH 3 COO) 2 ·4H 2 O) and 0.043 mol of manganese acetate tetrahydrate (Mn(CH 3 COO) 2 ·4H 2 O) solid, use 50% ethanol solution to configure metal salt solution A with total metal ion concentration of 1mol / L; take 0.25mol oxalic acid, use absolute ethanol as solvent to configure solution B of 1.0mol / L . Subsequently, the metal salt solution ...

Embodiment 2

[0068] A polyaniline micro-rod structure lithium-rich manganese-based cathode material, the mass fraction of polyaniline coating is 1%, and the polyaniline-coated rod-shaped lithium-rich manganese-based oxide cathode material is synthesized in HTFSI, Li 1.2 Ni 0.13 Co 0.13 Mn 0.54 O 2 @1%PANI-HTFSI.

[0069] The preparation method of the polyaniline microrod structure lithium-rich manganese-based positive electrode material is the same as that in Example 1, and the difference is:

[0070] The amount of aniline monomer is 0.005g, wherein the amount of ammonium persulfate is (take the amount of solid powder with a molar mass of aniline monomer 1:1 and dissolve it in an appropriate amount of deionized water, and the concentration is 0.01-0.5mol / L).

Embodiment 3

[0072] A polyaniline micro-rod structure lithium-rich manganese-based cathode material, the mass fraction of polyaniline coating is 1.5%, and the polyaniline-coated rod-shaped lithium-rich manganese-based oxide cathode material is synthesized in HTFSI, Li 1.2 Ni 0.13 Co 0.13 Mn 0.54 O 2 @1.5% PANI-HTFSI.

[0073] The preparation method of the polyaniline microrod structure lithium-rich manganese-based positive electrode material is the same as that in Example 1, and the difference is:

[0074] The amount of aniline monomer is 0.0075g, wherein the amount of ammonium persulfate is (take the amount of solid powder with a molar mass of aniline monomer 1:1 and dissolve it in an appropriate amount of deionized water, and the concentration is 0.01-0.5mol / L).

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Abstract

The invention discloses a polyaniline-coated lithium-rich manganese-based positive electrode material synthesized by using HTFSI, and a preparation method and application of the polyaniline-coated lithium-rich manganese-based positive electrode material. The preparation method comprises the following steps: mixing and dissolving soluble lithium salt, cobalt salt, nickel salt and manganese salt to obtain a metal salt solution, mixing the metal salt solution with a precipitator, and carrying out hydrothermal reaction, cooling, drying, grinding, roasting and grinding on the obtained mixture to obtain the rod-like lithium-rich manganese-based oxide positive electrode material. And dispersing the obtained rod-like lithium-rich manganese-based oxide positive electrode material in deionized water for ultrasonic treatment, placing in a low-temperature reactor, maintaining the temperature at-5-10 DEG C, adding an aniline monomer solution, hydrochloric acid or a bis (trifluoromethylsulfonyl) imide solution and an oxidizing agent, reacting for a period of time, and drying to obtain the lithium-rich manganese-based oxide positive electrode material. And filtering, washing and drying to obtain the polyaniline coated microrod lithium-rich manganese-based positive electrode material. According to the present invention, the polyaniline coating is synthesized by using the HTFSI in one step, the preparation method is simple, and the obtained material has advantages of excellent rate performance and good cycle stability.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a lithium-rich manganese-based positive electrode material with a polyaniline micro-rod structure and a preparation method and application thereof. Background technique [0002] Lithium-rich material Li 1+x M 1-x O 2 (M is Ni, Co, Mn) has always been one of the research hotspots of cathode materials for lithium ion batteries. At present, the actual discharge specific capacity of lithium-rich manganese-based layered oxides has reached more than 250mAh / g, and the energy density can reach 900Wh / kg, which is significantly higher than that of lithium iron phosphate LiFePO. 4 , ternary LiNi 1-x-y Mn x Co y O 2 and other cathode materials; and in addition to higher lithium storage performance, compared with "high nickel" ternary cathode materials. The transition metals that make up the lithium-rich manganese-based oxide cathode material are mainly manganese with abundant res...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/60H01M10/0525C08G73/02
CPCH01M4/366H01M4/505H01M4/525H01M4/606H01M10/0525C08G73/0266H01M2004/028Y02E60/10
Inventor 陈胜洲陈汶杨伟邹汉波
Owner GUANGZHOU UNIVERSITY
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