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Method for preparing two-dimensional inorganic perovskite negative electrode material by solid-liquid phase reaction

A negative electrode material and liquid phase reaction technology, which is applied in the field of solid-liquid phase reaction to prepare two-dimensional inorganic perovskite negative electrode materials, can solve the problems of high cost and complicated preparation process, and achieve the effect of excellent electrochemical performance

Inactive Publication Date: 2018-08-28
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Description
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  • Application Information

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Problems solved by technology

[0006] Based on the technical problems existing in the background technology, the present invention proposes a method for preparing a two-dimensional inorganic perovskite negative electrode material by solid-liquid phase reaction, which solves the need for graphitization and carbon coating under high temperature conditions for current lithium ion battery negative electrode materials Such problems as complex preparation process and high cost

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  • Method for preparing two-dimensional inorganic perovskite negative electrode material by solid-liquid phase reaction
  • Method for preparing two-dimensional inorganic perovskite negative electrode material by solid-liquid phase reaction

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Embodiment 1

[0025] A method for preparing a two-dimensional inorganic perovskite negative electrode material by solid-liquid phase reaction, comprising the following steps:

[0026] S1. Add lead bromide and cesium bromide in a molar ratio of 1:1 to N,N-dimethylformamide, heat to 68°C, stir for 2.2 hours, and dry in vacuum to obtain a yellow precursor powder CsPbBr 3 ;

[0027] S2, the precursor powder CsPbBr 3 After mixing with lead bromide at a molar ratio of 1:1, ball milling for 10 hours, the grinding ball and the precursor powder CsPbBr 3 The ball-to-material ratio is 11:1, the ball milling speed is 3000r / min, grinding for 3h, and vacuum drying at 119°C for 2.2h to obtain a two-dimensional inorganic perovskite negative electrode material.

Embodiment 2

[0029] A method for preparing a two-dimensional inorganic perovskite negative electrode material by solid-liquid phase reaction, comprising the following steps:

[0030] S1. Add lead bromide and cesium bromide in a molar ratio of 1:1 to N,N-dimethylformamide, heat to 72°C, stir for 1.6h, and dry in vacuum to obtain a yellow precursor powder CsPbBr 3 ;

[0031] S2, the precursor powder CsPbBr 3 After mixing with lead bromide at a molar ratio of 1:1, ball milled for 14 hours, the ball and precursor powder CsPbBr 3 The ball-to-material ratio is 9:1, the ball milling speed is 4000r / min, grinding for 2h, and vacuum drying at 122°C for 1.8h to obtain a two-dimensional inorganic perovskite negative electrode material.

Embodiment 3

[0033] A method for preparing a two-dimensional inorganic perovskite negative electrode material by solid-liquid phase reaction, comprising the following steps:

[0034] S1. Add lead bromide and cesium bromide in a molar ratio of 1:1 to N,N-dimethylformamide, heat to 70°C, stir for 2 hours, and dry in vacuum overnight to obtain a yellow precursor powder CsPbBr 3 ;

[0035] S2, the precursor powder CsPbBr 3 Mix it with lead bromide at a molar ratio of 1:1, add it to a clean agate ball mill jar, and press the ball and precursor powder CsPbBr 3 The ball-to-material ratio is 10:1, add agate balls, and seal and fix the agate tube in the planetary ball mill. The planetary ball mill rotates the ball at a speed of 3500r / min for 12 hours. The ball milling reaction process maintains a dry environment. In the process, the precursor powder CsPbBr was made 3 It can fully contact and react with lead bromide; then place it in an agate mortar and grind for 2.5 hours, and dry it in vacuum a...

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Abstract

The invention discloses a method for preparing a two-dimensional inorganic perovskite negative electrode material by solid-liquid phase reaction. The method comprises the following steps of adding lead bromide and cesium bromide into N,N-dimethylformamide, heating and stirring, and drying under the vacuum condition, so as to obtain precursor powder; mixing the precursor powder and the lead bromide, performing ball milling, grinding, and drying under the vacuum condition, so as to obtain the two-dimensional inorganic perovskite negative electrode material. The method for preparing the two-dimensional inorganic perovskite negative electrode material by the solid-liquid phase reaction has the advantages that by adopting the simple solution synthesizing and ball milling technology, the precursor material is in contact with an interface in the high-energy impacting process, and then reacts, so as to obtain the inorganic perovskite material with high crystallizing degree; the problems of complicated preparation technology and higher cost due to graphitizing and carbon coating required by the existing negative electrode material of the lithium ion battery at high temperature are solved; the large-batch synthesizing preparation purpose is realized, the production process of the negative electrode material is greatly shortened, and the material cost is greatly reduced.

Description

technical field [0001] The invention relates to the technical field of negative electrode materials for lithium ion batteries, in particular to a method for preparing two-dimensional inorganic perovskite negative electrode materials by solid-liquid phase reaction. Background technique [0002] With the increasing depletion of energy fossil fuels and the increasingly serious environmental pollution caused by the use of energy, human beings have more and more demands for clean and recyclable energy. Renewable energy represented by wind energy, solar energy, and nuclear energy has gradually entered human life. Lithium-ion batteries, as a new type of clean and recyclable energy, have received more and more attention, and are widely used in electronic products, power vehicles, and energy storage. [0003] As the core part of lithium-ion batteries, the anode materials of lithium-ion batteries mainly use graphite anodes, such as artificial graphite and natural graphite. Graphite ...

Claims

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Application Information

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IPC IPC(8): C01G21/00H01M4/58
CPCC01G21/006C01P2002/34C01P2004/20C01P2004/80H01M4/582H01M10/0525H01M2004/027Y02E60/10
Inventor 姜雨恒童国庆周皖岳
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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