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Preparation of high-voltage two-dimensional lithium manganate cathode material using porous nano-flaky dimanganese trioxide intermediate, and preparation method and application thereof

A technology of manganese trioxide and lithium nickel manganese oxide, which is applied in the direction of manganese oxide/manganese hydroxide, chemical instruments and methods, battery electrodes, etc., can solve problems such as unsuitability for industrial production, complex production process, and harsh reaction conditions. To achieve the effect of keeping the crystal shape intact, good shape and improving crystal stability

Active Publication Date: 2022-07-26
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method not only has complex production process, but also has harsh reaction conditions, and a large amount of by-product sodium / ammonium salts are produced in the preparation process, which is not suitable for industrial production

Method used

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  • Preparation of high-voltage two-dimensional lithium manganate cathode material using porous nano-flaky dimanganese trioxide intermediate, and preparation method and application thereof
  • Preparation of high-voltage two-dimensional lithium manganate cathode material using porous nano-flaky dimanganese trioxide intermediate, and preparation method and application thereof
  • Preparation of high-voltage two-dimensional lithium manganate cathode material using porous nano-flaky dimanganese trioxide intermediate, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1) Weigh 1.0g (0.004mol) of manganese acetate tetrahydrate and dissolve it in 25mL of ethylene glycol solution, add 0.8g of polyvinylpyrrolidone-K30, stir at a rate of 100rpm, heat up after it is completely dissolved, and react at 170°C for 4h , a white precipitate was obtained;

[0033] (2) Washing the white precipitate with ethanol, then drying the white precipitate, and finally calcining the white precipitate in a muffle furnace at 600° C. for 5 hours at a heating rate of 2° C. / min to obtain porous flake manganese trioxide.

[0034] (3) Weigh 0.50 g of prepared porous flake manganese trioxide, 0.1577 g of nickel oxide, and 0.2367 g of lithium oxalate, and mix them uniformly with a ball mill;

[0035] (4) The homogeneously mixed material obtained by ball milling is first calcined at low temperature, then naturally cooled to room temperature, and then ball-milled again by a ball mill; the heating rate is 4°C / min, the low-temperature calcination temperature is 400°C, a...

Embodiment 2

[0042] (1) Weigh 0.5g (0.002mol) of manganese acetate tetrahydrate and dissolve it in 50mL of ethylene glycol solution, add 10mL of N-acetylethanolamine, stir at 300rpm, heat up after it is completely dissolved, and react at 195°C for 4h to obtain white precipitate;

[0043] (2) Washing the white precipitate with ethanol, then drying the white precipitate, and finally calcining the white precipitate in a muffle furnace at 500° C. for 3 hours at a heating rate of 1° C. / min to obtain porous flake manganese trioxide.

[0044] (3) Weigh the prepared porous flake manganese trioxide 0.20g, nickel nitrate hexahydrate 0.2455g and 0.0686g lithium carbonate, and mix them uniformly;

[0045] (4) The homogeneously mixed material obtained by ball milling is first calcined at a low temperature, then naturally cooled to room temperature, and then ball-milled again with a ball mill; the heating rate is 6°C / min, the low-temperature calcination temperature is 500°C, and the constant temperature...

Embodiment 3

[0048] (1) Weigh 2.0g (0.008mol) of manganese acetate tetrahydrate and dissolve it in 60mL of ethylene glycol solution, add 15mL of polyethylene glycol 200, stir at 200rpm, heat up after it is completely dissolved, and react at 190°C for 1h, A white precipitate was obtained;

[0049] (2) Washing the white precipitate with ethanol, then drying the white precipitate, and finally calcining the white precipitate in a muffle furnace at 650° C. for 2 hours at a heating rate of 2° C. / min to obtain porous flake manganese trioxide.

[0050] (3) Weigh 1.0 g of porous flake manganese trioxide, 1.0036 g of nickel chloride hexahydrate, and 0.8388 g of lithium citrate tetrahydrate prepared by weighing, and mix them uniformly;

[0051] (4) The homogeneously mixed material obtained by ball milling is first calcined at a low temperature, then naturally cooled to room temperature, and then ball-milled again by a ball mill; the heating rate is 3°C / min, the low-temperature calcination temperature...

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Abstract

The invention discloses a high-voltage two-dimensional lithium nickel manganate positive electrode material prepared by using a porous nano-flaky manganese trioxide intermediate, a preparation method and application thereof. Manganese acetate tetrahydrate is dissolved in ethylene glycol solution and a surfactant is added. Heating and stirring to obtain a white precipitate; calcining the white precipitate at high temperature to obtain porous flake dimanganese trioxide; mixing the porous flake dimanganese trioxide with nickel source and lithium source uniformly; first calcining the uniformly mixed material at low temperature again Ball milling: the ball-milled material is calcined at high temperature, followed by annealing and natural cooling to obtain a high-voltage two-dimensional spinel lithium nickel manganate cathode material; the synthesized two-dimensional lithium nickel manganese oxide has excellent electrochemical performance and structural stability; nanometer The flaky lithium nickel manganese oxide has a disordered structure of Fd3m with more 100 crystal planes, which improves the structural stability when used as a positive electrode material for lithium batteries, and reduces Li at the same time. + , which ultimately improves the cycling stability and rate capability.

Description

technical field [0001] The invention belongs to the field of positive electrode materials for lithium ion batteries, and relates to a high-voltage two-dimensional lithium nickel manganate positive electrode material prepared by using a porous nano-flaky dimanganese trioxide intermediate, and a preparation method and application thereof. Background technique [0002] Lithium-ion batteries have been widely used in portable devices, electric vehicles and hybrid electric vehicles since they were first commercialized by Sony in the early 1990s, revolutionizing the way we live. It is worth noting that the use of cobalt in lithium cobalt oxide batteries and nickel-cobalt-manganese ternary lithium batteries has made cobalt prices soar. In addition, the low abundance of cobalt in the crust and its inherent toxicity reduce the competitiveness of cobalt-containing materials. Among cobalt-free electrode materials, the theoretical energy density of spinel lithium nickel manganate is as ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G45/02C01G53/00H01M4/505H01M4/525
CPCC01G45/02C01G53/44H01M4/505H01M4/525C01P2004/03C01P2002/72Y02E60/10
Inventor 李明涛郑申拓
Owner XI AN JIAOTONG UNIV
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