Novel lithium ion battery CsPbBr3/CNT perovskite composite material and preparation method thereof

A technology of nanocomposite materials and composite nanomaterials, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of negative electrode cycle stability and relative capacity density, and achieve controllable performance, high application value, The effect of the novel synthesis method

Active Publication Date: 2020-02-28
SOUTHEAST UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The invention solves the problem that the cycle stability and relative capacity density of the negative electrode of the traditional lithium-ion battery cannot be achieved at the same time, as well as the bottleneck faced by the lithium-ion battery, and provides a CsPbBr 3 / CNT perovskite composite material and its preparation method, realizing CsPbBr 3 The first application of / CNT perovskite composite material in lithium-ion battery anode

Method used

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  • Novel lithium ion battery CsPbBr3/CNT perovskite composite material and preparation method thereof
  • Novel lithium ion battery CsPbBr3/CNT perovskite composite material and preparation method thereof
  • Novel lithium ion battery CsPbBr3/CNT perovskite composite material and preparation method thereof

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Embodiment 1

[0035]1. Disperse 10 mg of carboxylated carbon nanotubes in 50 mL of DMF to make a 0.2 g / L dispersion, ultrasonically vibrate for 3 hours to make it evenly dispersed; then centrifuge at 6500 rpm for 10 minutes, take the supernatant, and set aside;

[0036] 2. Weigh CsBr and PbBr respectively according to the molar ratio of 1:1 2 0.1 mmol each, add 5 mL of the supernatant obtained in step 1, and ultrasonically dissolve it completely for 20 min; make it into 0.02 mol / L CsPbBr 3 / CNT precursor mixture; heated to 90°C with magnetic stirring to mix the mixture evenly;

[0037] 3. According to the volume ratio of 1:10, take 5mL of the precursor mixture and add it to 50mL of toluene; after stirring for 1 hour at room temperature, wash with ethyl acetate for three times, and dry the precipitate in a vacuum oven at 60°C overnight to obtain CsPbBr 3 / CNT composite nanomaterials. The materials and electrochemical properties of the obtained products are shown in Table 1.

Embodiment 2

[0039] 1. Disperse 20mg of carboxylated carbon nanotubes in 40mL DMF to make a 0.5g / L dispersion, ultrasonically vibrate for 6h to make it evenly dispersed; then centrifuge at 6500rpm for 15min, take the supernatant, and set aside;

[0040] 2. Weigh CsBr and PbBr respectively according to the molar ratio of 1:1 2 0.1 mmol each, add 5 mL of the supernatant obtained in step 1, and ultrasonically dissolve the mixture completely for 20 min; make it into 0.02 mol / L CsPbBr 3 / CNT precursor mixture; heated to 95°C with magnetic stirring to mix the mixture evenly;

[0041] 3. According to the volume ratio of 1:40, take 0.5mL of the precursor mixture and add it to 20mL of toluene; after stirring at room temperature for 1 hour, centrifuge and wash with ethyl acetate three times, and dry the precipitate in a vacuum oven at 60°C overnight to obtain CsPbBr 3 / CNT composite nanomaterials. The materials and electrochemical properties of the obtained products are shown in Table 1.

Embodiment 3

[0043] 1. Disperse 5 mg of carboxylated carbon nanotubes in 50 mL of DMF to make a 0.1 g / L dispersion, ultrasonically vibrate for 3 hours to make it evenly dispersed; then centrifuge at 6500 rpm for 15 minutes, take the supernatant, and set aside;

[0044] 2. Weigh CsBr and PbBr respectively according to the molar ratio of 1:1 2 0.1 mmol each, add 10 mL of the supernatant obtained in step 1, and ultrasonically dissolve it completely for 10 min; make it into 0.01 mol / L CsPbBr 3 / CNT precursor mixture; heated to 70°C with magnetic stirring to mix the mixture evenly;

[0045] 3. According to the volume ratio of 1:4, take 10mL of the precursor mixture and add it to 40mL of toluene; after stirring for 1 hour at room temperature, wash with ethyl acetate for three times, and dry the precipitate in a vacuum oven at 60°C overnight to obtain CsPbBr 3 / CNT composite nanomaterials. The materials and electrochemical properties of the obtained products are shown in Table 1.

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Abstract

The invention belongs to the field of composite nano materials, and especially relates to a novel lithium ion battery CsPbBr3 / CNT perovskite composite material and a preparation method thereof. The novel perovskite material is applied to a lithium ion battery for the first time, and the microstructure of the novel perovskite material is a compound of carbon nanotubes and novel inorganic perovskiteCsPbBr3 nanoparticles, wherein the CsPbBr3 nanoparticles are uniformly distributed to form a honeycomb porous structure; and the high-conductivity material carbon nanotubes are distributed in the CsPbBr3 nano-particles and on the surfaces of the CsPbBr3 nano-particles as conductive carbon matrix, so that connection and conductivity effects are achieved. The preparation method comprises the following steps: dispersing carbon nanotubes as a carbon source in a solvent, carrying out ultrasonic centrifugation, and taking supernatant as a mixture A; dissolving CsBr and PbBr2 in the mixture A, carrying out heating and uniformly mixing to obtain a CsPbBr3 / CNT precursor; and adding the CsPbBr3 / CNT precursor into an anti-solvent for reaction, and carrying out post-treatment to obtain a CsPbBr3 / CNTcomposite nano material, the reaction process being completed under normal temperature. When the material is applied to a lithium ion battery negative electrode material, the capacity is stabilized at500-560 mAh / g after the material is circulated for 100 circles under the current density of 100 mA / g, and the material has good cycling stability.

Description

technical field [0001] The invention belongs to the field of composite nanomaterials, in particular to a novel lithium ion battery CsPbBr 3 / CNT perovskite composite material and preparation method thereof. Background technique [0002] The energy crisis and environmental pollution caused by humans' excessive dependence on fossil fuels (coal, oil, natural gas, etc.) have attracted worldwide attention to renewable energy. As a representative of new energy with great development prospects, lithium-ion batteries have been widely used in various fields since they were successfully commercialized in the 1990s, most widely such as portable electronic devices and electric vehicles. Under the general situation of the continuous advancement of the commercialization of lithium-ion batteries, human beings have continuously improved their electrochemical performance requirements. Gradually, the various components of lithium-ion batteries have also developed their own systems accordingl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525C01B32/158
CPCH01M4/362H01M4/58H01M4/625H01M10/0525C01B32/158Y02E60/10
Inventor 娄永兵刘帅
Owner SOUTHEAST UNIV
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