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Lithium nickel manganese oxide anode material of three-dimensional desert wave structure and preparing method and application of lithium nickel manganese oxide anode material

A wave structure, lithium nickel manganese oxide technology, applied to structural parts, battery electrodes, electrical components, etc., can solve problems such as poor cycle stability

Active Publication Date: 2018-09-21
HUBEI UNIV
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Problems solved by technology

In order to further improve the rate performance of lithium nickel manganese oxide positive electrode, the existing technology improves the rate performance of lithium nickel manganese oxide positive electrode material by two-dimensional three-dimensional lithium nickel manganese oxide. This structure can effectively enhance the cycle stability and rate of the material. Performance, improve the application value of the product, but there is still the problem of poor cycle stability

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  • Lithium nickel manganese oxide anode material of three-dimensional desert wave structure and preparing method and application of lithium nickel manganese oxide anode material
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  • Lithium nickel manganese oxide anode material of three-dimensional desert wave structure and preparing method and application of lithium nickel manganese oxide anode material

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preparation example Construction

[0033] The invention provides a method for preparing a lithium nickel manganese oxide cathode material with a three-dimensional desert wave structure, comprising the following steps:

[0034] (1) Nickel acetate tetrahydrate, manganese acetate tetrahydrate, water and ethylene glycol are mixed to obtain a mixed solution;

[0035] (2) After adding hydrazine hydrate dropwise to the mixed solution obtained in the step (1), carry out a hydrothermal reaction to obtain a nickel-manganese precursor;

[0036] (3) pre-calcining the nickel-manganese precursor obtained in the step (2) to obtain a pre-calcined product;

[0037] (4) the mol ratio of the precalcined product that described step (3) obtains and the lithium element in lithium carbonate, the nickel element in nickel acetate tetrahydrate and the manganese element in manganese acetate tetrahydrate is 1.03~1.08:0.5: 1.5 Lithium carbonate is mixed and calcined by process control to obtain a three-dimensional desert wave structure li...

Embodiment 1

[0069] (1) 0.5mmolNi(CH 3 COO) 2 4H 2 O and 1.5mmolMn(CH 3 COO) 2 4H 2 O and 3.5mL ethylene glycol were dissolved in 21mL deionized water to obtain a raw material mixture;

[0070] (2) Add 5 mmol of hydrazine hydrate solution dropwise to the raw material mixture under stirring, and the dropping time is 10 minutes; after the dropping is completed, continue to stir for 30 minutes to obtain a suspension;

[0071] (3) Transfer the suspension to a hydrothermal reaction kettle for hydrothermal reaction, the temperature of the hydrothermal reaction is 190°C, and the time of the hydrothermal reaction is 12h; after the hydrothermal reaction is completed, the reaction kettle is cooled to room temperature Finally, through centrifugation, the precipitate was obtained; the precipitate was washed twice with distilled water and absolute ethanol, and a 50mL centrifuge tube was used to carry out centrifugal washing at a speed of 7500rpm, with 25-35mL of water for each washing; the washed ...

Embodiment 2

[0085] (1) 0.5mmolNi(CH 3 COO) 2 4H 2 O and 1.5mmolMn(CH 3 COO) 2 4H 2 O and 7mL ethylene glycol are dissolved in 42mL deionized water to obtain a raw material mixture;

[0086] (2) Add 6 mmol of hydrazine hydrate solution dropwise to the raw material mixture in a stirring state, and the dropping time is 10 minutes; after the dropping is completed, continue to stir for 30 minutes to obtain a suspension;

[0087] (3) Transfer the suspension to a hydrothermal reaction kettle for hydrothermal reaction, the temperature of the hydrothermal reaction is 190°C, and the time of the hydrothermal reaction is 12h; after the hydrothermal reaction is completed, the reaction kettle is cooled to room temperature Finally, through centrifugation, the precipitate was obtained; the precipitate was washed twice with distilled water and absolute ethanol, and a 50mL centrifuge tube was used to carry out centrifugal washing at a speed of 7500rpm, with 25-35mL of water for each washing; the washe...

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Abstract

The invention provides a preparing method of a lithium nickel manganese oxide anode material of a three-dimensional desert wave structure, and belongs to the field of anode materials for lithium ion batteries. According to the preparing method, tetrahydrate nickel acetate and tetrahydrate manganese acetate serve as raw materials, ethylene glycol serves as an end-capping agent and a chelating agent, and hydrazine hydrate serves as a morphology guiding agent; based on the synergistic effect of hydrazine hydrate and ethylene glycol in a hydrothermal reaction, a precursor is synthesized; then through pre-roasting and control over roasting in the process of mixing lithium carbonate, preparation of the three-dimensional lithium nickel manganese oxide anode material can be achieved, and rich anddiversified morphology and performance are provided for the end product. The prepared lithium nickel manganese oxide anode materials of the three-dimensional desert wave structure are connected mutually, from the whole aspect, the wide and uninterrupted three-dimensional desert wave structure is conducive to quick transfer of electrons, and barrier-free electron transfer can be achieved; from thepartial aspect, uniform and quasi-circular nanometer discs can shorten the diffusion distance of lithium ions, an uninterrupted electricity-conductive network is formed, and excellent electricity conductivity and a high transfer rate are provided.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery cathode materials, in particular to a lithium nickel manganese oxide cathode material with a three-dimensional desert wave structure and a preparation method and application thereof. Background technique [0002] Since the 20th century, modern science and technology and industry have developed rapidly, and human demand for natural resources is increasing day by day. In order to solve the problem of the depletion of fossil energy, it has become an important mission for human beings to seek new energy models. At present, the most commonly used electrochemical secondary batteries are lead-acid batteries, nickel-cadmium batteries, nickel-metal hydride batteries, and lithium-ion batteries. Among them, lithium-ion batteries (LIBs), as a new type of energy with outstanding advantages such as high specific energy, no memory effect, high working voltage, safety, long life and good cycle perfor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525
CPCH01M4/505H01M4/525Y02E60/10
Inventor 梅涛周诗远陶志崔振起王建颖李金华王贤保
Owner HUBEI UNIV
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