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SiNPs@CA@GO composite material as well as preparation method and application thereof

A composite material, citric acid technology, applied in nanotechnology, electrical components, electrochemical generators, etc. for materials and surface science, can solve the problems of poor shape retention, high price, complex synthesis process, etc., and achieve stable cycle The effect of improved performance, easy industrial production, and simple production process

Inactive Publication Date: 2018-11-13
RES INST OF XIAN JIAOTONG UNIV & SUZHOU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the current commercial binder PVDF has a complicated chemical synthesis process and is expensive. It can only be combined with the anode material by Van der Waals force, which has poor shape retention and cannot provide sufficient adhesion for silicon-based materials with severe volume changes. The electrode material is easy to pulverize and fall off from the current collector, so the battery cycle performance is unstable and the capacity decays rapidly

Method used

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  • SiNPs@CA@GO composite material as well as preparation method and application thereof
  • SiNPs@CA@GO composite material as well as preparation method and application thereof
  • SiNPs@CA@GO composite material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Example 1: Comparison of SiNPs@CA and SiNPs@PVDF composite electrodes

[0036] (1) Disperse 10 mg, 20 mg, 40 mg, and 80 mg of SiNPs in 100 mL of deionized water, respectively, add 10 mg of citric acid monohydrate (CA), and stir for 2 h. Freeze dried. SiNPs@CA with SiNPs:CA ratios of 1:1, 2:1, 4:1, and 8:1 were obtained.

[0037] (2) Disperse 10 mg, 20 mg, 40 mg, and 80 mg of SiNPs in 100 mL of deionized water, respectively, add 10 mg of polyvinylidene fluoride (PVDF), and stir for 2 h. Freeze dried. SiNPs@PVDF with SiNPs:PVDF ratios of 1:1, 2:1, 4:1, and 8:1 were obtained.

[0038] The above materials were prepared as working electrodes, and their specific capacity and cycle stability were tested. The results are as follows: figure 2 shown. from figure 2 It can be seen from the figure that the capacities of the four groups of Si@PVDF composite electrodes show a downward trend. Compared with Si@PVDF, the capacity cycle trend of the four groups of Si@CA is stable,...

Embodiment 2

[0039] Example 2: Preparation of SiNPs@CA@GO Composite Anode Material

[0040] (1) Disperse 40mg, 50mg, 60mg, and 70mg of SiNPs in 50mL of deionized water, respectively, add 60mg, 50mg, 40mg, and 30mg of citric acid (CA), and stir for 2h. SiNPs@CA of 40% SiNPs, 50% SiNPs, 60% SiNPs, and 70% SiNPs were obtained.

[0041] (2) Disperse 4 parts of 25mg graphene oxide (GO) in 30mL deionized water respectively, and ultrasonically for 30min.

[0042] (3) Add the graphene oxide (GO) treated in step (2) to SiNPs@CA of step (1) 40% SiNPs, 50% SiNPs, 60% SiNPs, and 70% SiNPs respectively. Get SiNPs@CA@GO. Ultrasonic for 2h, freeze-dried. Denote as sample 1, sample 2, sample 3, sample 4.

Embodiment 3

[0043] Embodiment 3: the preparation of working electrode

[0044]According to the active material: conductive carbon black = 9:1 mixing, at the same time add an appropriate amount of N-methylpyrrolidine copper (NMP) to make slurry (stir for 12h), apply the mixed slurry evenly on the copper foil with a film applicator, set Dry in a vacuum oven at 120°C (12h); after taking it out, use a punching machine to punch out After weighing the electrode sheet, place it again in a vacuum oven at 60°C for 2 hours; assemble it into a battery in a glove box with Ar atmosphere, water and air content below 0.1ppm.

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Abstract

The invention discloses a SiNPs@CA@GO composite material as well as a preparation method and application thereof and belongs to the technical field of lithium batteries. The preparation method comprises the following steps: firstly, coating the surfaces of silicon nanoparticles by citric acid so as to form CA@SiNPs, and further compounding with graphene oxide (GO) to form a chemical bond connectedSiNPs@CA@GO composite electrode, wherein the capacity of the composite electrode is maintained at about 1500mAh*g<-1>. CA in the SiNPs@CA@GO can play a role of a SiNPs surface coating layer, mutual contact of SiNPs with electrolyte can be effectively prevented, and then the circulation stability of a silicon cathode can be improved. The composite material is simple in preparation process, easy toprepare, good in environment protection and easy in industrial application.

Description

technical field [0001] The invention relates to a SiNPs@CA@GO composite material and its preparation method and application, belonging to the technical field of lithium batteries. Background technique [0002] Traditional commercial lithium-ion battery anodes mostly use carbon-based materials, and carbon-based materials have a small capacity, which has been unable to meet people's urgent needs for large-capacity lithium batteries. Therefore, it is imminent to develop new lithium-ion battery anode materials. [0003] Silicon anode material has the highest theoretical specific capacity (4200mAh / g), and at the same time has a lower lithium intercalation / delithiation potential, and silicon is also the second largest element in the earth's crust, with a wide range of sources. Therefore, silicon materials can be used to develop a new generation of lithium-ion batteries in order to increase their capacity. However, because of the huge volume expansion (>300%) during its cycle,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/583H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/362H01M4/386H01M4/583H01M10/0525Y02E60/10
Inventor 徐慧陈睿金宏张慧张亚文王勇李婷白益露
Owner RES INST OF XIAN JIAOTONG UNIV & SUZHOU