Atomic-scale doped lithium nickel manganese oxide positive electrode material as well as preparation method and application thereof

A technology of lithium nickel manganate and cathode material, which is applied in the field of atomic-level doped lithium nickel manganate cathode material and its preparation, can solve the problems of capacity decrease, destroy the structural integrity of crystal structure, etc., so as to improve the stability and improve the cycle. Stability and the effect of suppressing the loss of Mn

Active Publication Date: 2022-03-08
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At the same time, spinel LNMO will also have harmful dissolution of manganese in the electrolyte during the cycle, and the dissolution of manganese is due to the Mn 3+ Unstable disproportionation reaction (Ginger Taylor effect), resulting in Mn 2+ Soluble in the electrolyte, resulting in vacant 16d sites, destroying the structural integrity of the crystal structure, resulting in a rapid decline in capacity

Method used

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  • Atomic-scale doped lithium nickel manganese oxide positive electrode material as well as preparation method and application thereof
  • Atomic-scale doped lithium nickel manganese oxide positive electrode material as well as preparation method and application thereof
  • Atomic-scale doped lithium nickel manganese oxide positive electrode material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) Weigh 2.0g (0.008mol) of manganese acetylacetonate and dissolve it in 50mL of ethylene glycol solution, and add 1.0g of polyvinylpyrrolidone-K15 at a stirring rate of 300rpm, heat up after it is completely dissolved, and react at 170°C for 6h, A white precipitate was obtained;

[0032] (2) Wash the white precipitate with ethanol, then dry the white precipitate, and finally calcinate the white precipitate in a muffle furnace at 700°C for 4h at a heating rate of 2°C / min to obtain flaky manganese trioxide.

[0033] (3) Weigh 0.392g of flaky manganese trioxide, 0.126g of nickel oxide, and 0.137g of lithium carbonate, then add 0.017g of cerium oxide, disperse it all in ethanol and stir at room temperature for 20h, then place in a vacuum oven Dry in medium temperature, and finally use a ball mill to grind the material for 6 hours at a speed of 600 rpm.

[0034] (4) The homogeneously mixed material was directly calcined at a high temperature at a temperature of 950°C, a c...

Embodiment 2

[0039] (1) Weigh 1.5g (0.006mol) of manganese acetylacetonate and dissolve it in 50mL of ethylene glycol solution, and add 20mL of ethanolamine at a stirring rate of 200rpm, heat up after it is completely dissolved, and react at 190°C for 2 hours to obtain a white precipitate;

[0040] (2) Wash the white precipitate with ethanol, then dry the white precipitate, and finally calcinate the white precipitate in a muffle furnace at 600°C for 2h at a heating rate of 1°C / min to obtain flaky manganese trioxide.

[0041](3) Weigh 0.49g of flaky manganese trioxide, 0.196g of nickel hydroxide, 0.446g of L-lithium lactate, add 0.022g of hexapraseodymium undecoxide, disperse them all in ethanol and stir at room temperature for 22h , and then dry in a vacuum oven, and finally use a ball mill to grind the material for 5 hours at a speed of 800 rpm.

[0042] (4) The homogeneously mixed material is directly calcined at high temperature at a temperature of 900°C, a constant temperature time of ...

Embodiment 3

[0044] (1) Weigh 1.0g (0.004mol) of manganese acetylacetonate and dissolve it in 40mL of ethylene glycol solution, add 0.8g of polyethylene glycol 2000, stir at 100rpm, heat up after it is completely dissolved, and react at 195°C for 3h. A white precipitate was obtained;

[0045] (2) Wash the white precipitate with ethanol, then dry the white precipitate, and finally calcinate the white precipitate in a muffle furnace at 500°C for 5h at a heating rate of 1°C / min to obtain flaky manganese trioxide.

[0046] (3) Weigh 0.49g of flaky manganese trioxide, 0.386g of nickel oxalate dihydrate, 0.237g of lithium oxalate, add 0.034g of samarium trioxide, disperse it all in ethanol and stir at room temperature for 24h, then Dry in a vacuum oven, and finally use a ball mill to grind the material for 8 hours at a speed of 500 rpm.

[0047] (4) The homogeneously mixed material is directly calcined at high temperature at a temperature of 1000°C, a constant temperature time of 24h, a heating...

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Abstract

The invention discloses an atomic-scale doped lithium nickel manganese oxide positive electrode material and a preparation method and application thereof.The preparation method comprises the following steps that flaky manganese sesquioxide, a nickel source, a lithium source and rare earth metal oxide are mixed to be uniform, then the mixture is calcined at the temperature of 600-1000 DEG C through a rapid heating technology, and when the mixture is naturally cooled to the room temperature, the atomic-scale doped lithium nickel manganese oxide positive electrode material is obtained; and grinding to obtain the rare earth metal atomic-scale doped lithium manganate nickel manganese oxide positive electrode material. The preparation method of the atomic-scale doped lithium nickel manganese oxide positive electrode material is simple in process, high in efficiency, low in equipment requirement and easy to realize large-scale production; according to the invention, the battery material lithium nickel manganese oxide is modified by atomic-scale doped rare earth metal cations, so that under the condition that the crystal structure is basically unchanged, the stability of the crystal structure of the lithium nickel manganese oxide is improved, and the dissolution of manganese in an electrolyte caused by the ginger-Taylor effect is reduced; therefore, the cycling stability and the rate capability of the lithium nickel manganese oxide positive electrode material are effectively improved.

Description

technical field [0001] The invention belongs to the field of positive electrode materials for lithium ion batteries, and relates to an atomic level doped lithium nickel manganese oxide positive electrode material and a preparation method and application thereof. Background technique [0002] Lithium-ion batteries have become the most popular power sources for portable electronic devices and have shown great promise in electric and hybrid vehicles in recent years. Unfortunately, the limited energy density of current commercial Li-ion batteries reduces their competitiveness, prompting extensive research and development of next-generation Li-ion batteries with high energy density. Spinel LiNi 0.5 mn 1.5 o 4 The material has attracted more attention of researchers due to its high working voltage of 4.7V. Due to its higher energy density, lithium nickel manganese oxide is generally regarded as one of the cathode materials for next-generation lithium-ion batteries. [0003] T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/505H01M4/525H01M10/0525
CPCH01M4/628H01M4/505H01M4/525H01M10/0525H01M2004/028H01M2004/021Y02E60/10
Inventor 李明涛郑申拓
Owner XI AN JIAOTONG UNIV
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