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Preparation method of two-dimensional inorganic perovskite anode material for lithium battery

A negative electrode material, inorganic calcium technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of high cost and complex preparation process, and achieve the effect of good stability and excellent physical and chemical properties

Inactive Publication Date: 2018-09-07
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Based on the technical problems existing in the background technology, the present invention proposes a preparation method of a two-dimensional inorganic perovskite negative electrode material for lithium batteries, which solves the need for graphitization and carbon coating of current lithium ion battery negative electrode materials under high temperature conditions. The problem of complex process and high cost

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  • Preparation method of two-dimensional inorganic perovskite anode material for lithium battery
  • Preparation method of two-dimensional inorganic perovskite anode material for lithium battery
  • Preparation method of two-dimensional inorganic perovskite anode material for lithium battery

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Embodiment 1

[0025] A method for preparing a two-dimensional inorganic perovskite negative electrode material for a lithium battery, comprising the following steps:

[0026] S1. Add lead bromide and cesium bromide in a molar ratio of 2:1 to N,N-dimethylformamide, heat to 68°C, and stir for 3 hours. Nitrogen gas is introduced during the stirring process to obtain a mixed material;

[0027] S2. Vacuum drying the mixed material for 11 hours at a vacuum drying temperature of 82° C. to obtain a white precursor material;

[0028] S3. Add the precursor material to toluene, centrifuge three times, and vacuum-dry the solid obtained by centrifugation for 1.5 hours at a temperature of 72° C. to obtain a two-dimensional inorganic perovskite negative electrode material for lithium batteries.

Embodiment 2

[0030] A method for preparing a two-dimensional inorganic perovskite negative electrode material for a lithium battery, comprising the following steps:

[0031] S1. Add lead bromide and cesium bromide in a molar ratio of 2:1 to N,N-dimethylformamide, heat to 72°C, stir for 2 hours, and inject argon gas during the stirring process to obtain a mixed material;

[0032] S2. Vacuum drying the mixed material for 13 hours at a vacuum drying temperature of 78° C. to obtain a white precursor material;

[0033] S3. Add the precursor material to toluene, centrifuge three times, and vacuum-dry the solid obtained by centrifugation for 2.5 hours at a temperature of 68° C. to obtain a two-dimensional inorganic perovskite negative electrode material for lithium batteries.

Embodiment 3

[0035] A method for preparing a two-dimensional inorganic perovskite negative electrode material for a lithium battery, comprising the following steps:

[0036] S1. Put lead bromide and cesium bromide in a three-neck beaker with a molar ratio of 2:1, add 1mL N,N-dimethylformamide, heat to 70°C, stir for 2.5h, and add A mixed gas of nitrogen and neon is used to avoid the influence of humidity in the air to obtain a mixed material;

[0037] S2. Pour the mixed material into a clean beaker, place it in a vacuum drying oven, the vacuum drying temperature is 80° C., and the vacuum drying time is 12 hours to obtain a white precursor material;

[0038] S3. Add the precursor material to toluene, centrifuge three times, and vacuum-dry the solid obtained by centrifugation for 2 hours at a temperature of 70° C. to obtain a two-dimensional inorganic perovskite negative electrode material for lithium batteries.

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Abstract

The invention discloses a preparation method of a two-dimensional inorganic perovskite anode material for a lithium battery. The preparation method comprises the following steps of adding lead bromideand cesium bromide into N,N-dimethylformamide, heating and stirring, and introducing protective gas in the stirring process, so as to obtain a mixture; drying the mixture under the vacuum condition,so as to obtain a precursor material; adding toluene into the precursor material, centrifuging and separating, and drying the obtained centrifuged solid material under the vacuum condition, so as to obtain the two-dimensional inorganic perovskite anode material for the lithium battery. The preparation method of the two-dimensional inorganic perovskite anode material for the lithium battery has theadvantages that the simple one-step synthesis technology is adopted; by performing simple dissolving and extracting process, the perovskite material with high purity and high crystallizing degree canbe obtained; the problems of complicated preparation technology of graphitizing and carbon coating at high temperature and higher cost in the conventional anode material of the lithium battery are solved.

Description

technical field [0001] The invention relates to the technical field of negative electrode materials for lithium batteries, in particular to a method for preparing a two-dimensional inorganic perovskite negative electrode material for lithium batteries. Background technique [0002] The anode materials for lithium-ion batteries mainly use graphite-based carbon anode materials, which have a wide range of raw materials, low prices, and excellent electrochemical cycle performance. They have become the main commercial materials in the lithium battery field, especially in the power battery industry. However, the theoretical specific capacity (372mAh / g) of graphite-based carbon negative electrode materials is low, the compatibility with solvents is poor, and lithium dendrites are prone to be precipitated during charging and discharging, causing short circuits in the battery, thereby affecting the safety of the battery. In recent years, the silicon anode material proposed in recent ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M10/0525
CPCH01M4/366H01M4/582H01M10/0525Y02E60/10
Inventor 童国庆王双双欧阳浩淼姜雨恒周皖岳李新峰
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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