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Preparation of self-supported Sb2S5/three-dimensional graphene nanometer composite material and application in sodium ion battery

An antimony pentasulfide and composite material technology, applied in secondary batteries, battery electrodes, circuits, etc., can solve problems such as reducing battery energy density, achieve high rate performance, long cycle life, and shorten the diffusion path effect.

Inactive Publication Date: 2018-01-19
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a new type of negative electrode material, antimony pentasulfide has not been reported in the sodium ion battery system.
This will greatly reduce the overall energy density of the battery
However, the preparation of self-supporting nanoparticle-graphene composites remains a challenge.

Method used

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  • Preparation of self-supported Sb2S5/three-dimensional graphene nanometer composite material and application in sodium ion battery
  • Preparation of self-supported Sb2S5/three-dimensional graphene nanometer composite material and application in sodium ion battery
  • Preparation of self-supported Sb2S5/three-dimensional graphene nanometer composite material and application in sodium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The hydrothermal method is used to prepare antimony pentasulfide nanoparticles and three-dimensional graphene composite materials, and the steps are as follows:

[0036] (1) 44.7mg of Na 3 Sb 4 9H 2 O is dissolved in 9.3mL water to make 0.01mol L -1 The solution.

[0037] (2) 0.8mL graphene oxide (10mg mL -1 ) mixed with the above solution and stirred to form a homogeneous solution.

[0038] (3) Add 2.27mL of HCl (0.1mol L -1 ) and stirred for 2 hours.

[0039] (4) 0.632mL ascorbic acid (1mol L -1 ) was added dropwise to the above solution.

[0040] (5) The mixed solution in the above step 4) was transferred to a 50 mL reactor and heated to 90° C. for 6 hours. After freezing with liquid nitrogen, it was transferred to a freeze dryer for 18 hours to obtain Sb 2 S 5 -GF Composite.

[0041] Sb with self-supporting properties 2 S 5 -GF composite material preparation process such as figure 1 As shown, the obtained sample is antimony pentasulfide nanoparticles ...

Embodiment 2

[0045] Add Na in embodiment 1 3 Sb 4 9H 2 O (0.01mol L -1 ) was set at 5.9mL, and 1.44mL of HCl (0.1mol L -1 ), other with embodiment 1. The mass fraction of antimony pentasulfide in the obtained composite material was 71%. Its scanning electron microscope photograph is shown in Figure 8 . It can be seen from the figure that Sb 2 S 5 The nanoparticles are uniformly distributed on the porous graphene. Use this composite material as negative pole, adopt the same method as embodiment 1 to assemble battery, in 0.2Ag -1 The charge-discharge curve at a current density of Figure 9 Therefore, the reversible specific capacity after 300 cycles is 646mAh g -1 . As can be seen, the resulting specific capacity is relatively low. This is because the proportion of graphene in the composite material increases, and the theoretical specific capacity that graphene can contribute is less. The rate performance of the composite material is as follows Figure 10 As shown, the electr...

Embodiment 3

[0047] Add Na in embodiment 1 3 Sb 4 9H 2 O (0.01mol L -1 ) was set at 15.8mL, and 3.86mL of HCl (0.1mol L -1 ), other with embodiment 1. The mass fraction of antimony pentasulfide in the obtained composite material is 90%. Its scanning electron microscope photograph is shown in Figure 11 . due to Sb 2 S 5 As the load increases, a large amount of Sb can be observed 2 S 5 The particles aggregate on graphene sheets. Use this composite material as negative pole, adopt the same method as embodiment 1 to assemble battery, in 0.2Ag -1 The cycle performance curve under the current density is as follows Figure 12 shown. It can be seen that the resulting initial specific capacity is relatively high. However, because the proportion of graphene in the composite material decreases, the electrical conductivity becomes poorer, and the capacity decays faster. After 300 cycles, the reversible specific capacity is 563mAh g -1 . The rate performance of the composite material i...

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Abstract

The invention relates to preparation of a self-supported Sb2S5 / three-dimensional graphene nanometer composite material and application in a sodium ion battery. Sb2S5 nanoparticles and three-dimensional graphene are mixed, and a foamed Sb2s5-GF composite material figure (Figure 2) with self-support characteristic is finally prepared by simple hydrothermal reaction, the whole reaction process is simple and practical, and the controllability of nanoparticle loading capacity is good. When the prepared self-support Sb2s5-GF composite material is applied to the sodium ion battery, an insulation binding agent and a low-capacity conductive agent can be prevented being used, so that the battery performance is improved, and the battery shows high reversible capacity, long cycle lifetime and high rate performance (Figures 6-7). Compared with a traditional sodium ion battery electrode, the self-supported Sb2S5 / three-dimensional graphene nanometer composite material has the advantages that constituents such as a current collector, the binding agent and the conductive agent are not added, the cost is obviously reduced, and the capacity and the energy density of the battery also can be improved.

Description

technical field [0001] The invention relates to an antimony pentasulfide / three-dimensional graphene nanocomposite material for sodium ion batteries, in particular to a preparation method of antimony pentasulfide nanoparticle and three-dimensional graphene composite material and its sodium storage application, belonging to a new type of chemical power source field. Background technique [0002] Sodium-ion batteries have attracted extensive attention due to the abundance and low cost of sodium resources. However, the large radius of sodium ions makes their deintercalation and deintercalation slow in electrode materials. For bulk materials, this problem is even more serious. At present, one of the key issues in the sodium-ion battery system is to develop high-performance electrode materials. As a new type of negative electrode material, antimony pentasulfide has not been reported in the sodium ion battery system. Therefore, a detailed study of its application in Na-ion batt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/054
CPCY02E60/10
Inventor 陈军卢艳莹陶占良周蒙李海霞于川茗
Owner NANKAI UNIV
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