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Preparation method of multilevel-structured hollow nano-sphere of negative electrode material of high-performance lithium ion secondary battery

A technology for secondary batteries and negative electrode materials, which is applied in the field of preparation of hollow nanospheres with multi-level structures, achieving the effects of low production cost, good rate performance, and low energy consumption

Active Publication Date: 2014-09-10
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is no report on its use as a negative electrode material for lithium-ion secondary batteries.

Method used

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  • Preparation method of multilevel-structured hollow nano-sphere of negative electrode material of high-performance lithium ion secondary battery
  • Preparation method of multilevel-structured hollow nano-sphere of negative electrode material of high-performance lithium ion secondary battery
  • Preparation method of multilevel-structured hollow nano-sphere of negative electrode material of high-performance lithium ion secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Hierarchical Structure Nano ZnSn(OH) 6 Preparation of hollow spheres

[0046] 2m mol of Zn(CHCOO) 2 2H 2 O. 0.75g PAA was dissolved in 25mL of distilled water, stirred for 30min; 1.9mmol of Na 2 SnO3 4H 2 O was dissolved in 10mL of distilled water to make a solution, added dropwise to the above mixed solution, and continued to stir for 30min; to the above white turbid solution, 6mL NH 3 ·H 2 O. After stirring for 30 min, the above mixture was transferred to a 60 mL reaction kettle and maintained at 180°C for 24 h. After the reaction kettle is cooled down to room temperature, the obtained white product is centrifuged several times through absolute ethanol and distilled water. After the product is collected, it is dried under vacuum at 60°C. The obtained white product is a hierarchical structure nano-hydroxytin composed of nanorods Zinc acid hollow spheres. The XRD pattern, SEM photo and TEM image of the hierarchical structure nano-zinc hydroxystannate hollow spher...

Embodiment 2

[0048] Hierarchical structure nano Zn 2 SnO 4 Preparation of hollow spheres

[0049] Take an appropriate amount of the obtained zinc hydroxystannate compound, spread it evenly on a porcelain boat, place it in a crucible furnace, and calcinate at 600°C for 6h, with a heating rate of 5°C / min. The obtained product is a hollow nanometer zinc stannate hollow sphere. The XRD patterns, SEM photos and TEM images of the nano-zinc stannate hollow spheres with hierarchical structure figure 2 and Figure 4 shown.

Embodiment 3

[0051] Product performance test

[0052] Two products, the zinc stannate hollow spheres obtained in Example 1 and the zinc stannate hollow spheres obtained in Example 2, are used as negative electrode materials for lithium-ion secondary batteries, and the electrodes are prepared by a coating method. Material: Acetylene black: CMC=60:30:10 mixed in a ratio of 60:30:10, using distilled water as a solvent to make a negative electrode slurry, coated on a 12mm copper foil, fully dried and pressed to obtain a negative electrode sheet. Lithium sheet is used for battery positive sheet. In a glove box protected by inert gas, a 2320-type button cell was assembled with 1mol / L LiPF6 / EC / DMC / DEC (1:1:1) as the electrolyte and Celgerd2300 as the separator. Test instruments: charge and discharge instrument (Land); JEM-1011 transmission electron microscope, Bruker D8-X-ray diffractometer.

[0053] Test Results

[0054] Carry out the battery charge and discharge performance test on the blue ...

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Abstract

The invention relates to a preparation method of a multilevel-structured hollow nano-sphere of negative electrode material of a high-performance lithium ion secondary battery. The preparation method comprises the following steps: with a zinc source, a tin source and weak base as raw materials as well as surfactant polyacrylic acid (PAA) as a template, synthesizing a multilevel-structured hollow zinc hydroxystannate nano-sphere by virtue of a one-step hydrothermal method, wherein the diameter of the nano-sphere is 400-600nm; calcining in an air atmosphere, so as to obtain a morphology-maintained multilevel-structured zinc stannate nano-sphere structure. According to the preparation method, when the multilevel-structured hollow zinc hydroxystannate nano-sphere and a multilevel-structured zinc stannate nano-sphere are utilized as the negative electrode materials of the lithium ion secondary battery, both the two compounds show excellent electrochemical performance, high specific discharge capacity, good cycling stability and excellent rate capability; due to a specific multilevel structure, the hollow nano-sphere can provide a large surface area and a stable structure and can be widely applied to the fields of catalysis, the lithium ion secondary battery, solar cells and the like.

Description

technical field [0001] The invention relates to a method for preparing a high-performance lithium-ion secondary battery negative electrode material composed of nano-rods and a multi-level structure nano-hollow sphere, which belongs to the technical field of lithium-ion batteries. Background technique [0002] The negative electrode material is one of the key materials that affect the performance of lithium-ion secondary batteries. At present, carbon materials such as graphite have been commercialized as negative electrode materials for lithium-ion secondary batteries. Although carbon materials have made great progress compared with metal lithium in terms of electrochemical cycle performance and safety performance, because the lithium intercalation potential of carbon materials is similar to that of metal lithium, some lithium ions will still accumulate on the surface of the negative electrode during overcharging to form Lithium dendrites are easy to cause safety hazards. O...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/60B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00C01G19/00H01M4/5825H01M10/0525Y02E60/10
Inventor 徐立强张冉冉
Owner SHANDONG UNIV
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