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Charcoal-coated metal fluoride nano material with core-shell structure, preparation method and application of nano material as lithium battery positive electrode material

A core-shell structure, nanomaterial technology, applied in battery electrodes, nanotechnology, nanotechnology, etc., can solve the problem that fluoride and conductive materials cannot form a stable phase interface, fluoride and conductive materials are easy to peel off, and composite materials have a wide size distribution. and other problems, to achieve the effect of reducing charge transfer resistance, improving surface chemical activity, and improving cycle life

Inactive Publication Date: 2014-10-08
HANGZHOU INST OF ADVANCED MATERIAL BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the high-energy ball milling method is simple to operate, it has great limitations: (1) the size distribution of the prepared composite material is wide, and it is difficult to control the properties of the material; (2) the fluoride and the conductive material (carbon, etc.) cannot form a stable phase Interface, during charging and discharging; fluoride and conductive material are easy to peel off
However, in these nanocomposites, metal fluorides are mostly loaded on the surface of carbon nanomaterials, and so far there is no report on the core-shell carbon-coated metal fluoride core-shell nanomaterials.

Method used

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  • Charcoal-coated metal fluoride nano material with core-shell structure, preparation method and application of nano material as lithium battery positive electrode material
  • Charcoal-coated metal fluoride nano material with core-shell structure, preparation method and application of nano material as lithium battery positive electrode material
  • Charcoal-coated metal fluoride nano material with core-shell structure, preparation method and application of nano material as lithium battery positive electrode material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Weigh 2g ferrocene (C 10 h 10 Fe) and 16g ammonium fluoride (NH 4 F), and mix the two evenly. Put the mixture into an autoclave, under a nitrogen atmosphere, raise the temperature from room temperature to 500 °C at a rate of 1.5 °C / min, keep it warm for 3 hours, then cool to room temperature, wash away unreacted ammonium fluoride with water to obtain the core-shell Structure of carbon-coated iron fluoride nanomaterials.

[0026] as attached figure 1 Scanning electron microscope (SEM) analysis showed that the prepared carbon-coated ferric fluoride was rod-shaped, with a diameter ranging from 100 to 200 nm and a length of 1 to 3 μm.

[0027] as attached figure 2 Transmission electron microscope (TEM) image test shows that the prepared carbon-coated ferric fluoride material has a core-shell structure, the shell layer is carbon, the thickness is 10-20nm, the core layer is ferric fluoride, and the diameter is 90-180nm.

[0028] as attached image 3 X-ray diffraction ...

Embodiment 2

[0031] The operation method is the same as in Example 1, and the mass ratio is 1:4 to weigh 2g C 10 h 10 Fe and 8g NH 4 F, keeping other conditions unchanged. SEM analysis shows that the prepared carbon-coated ferric fluoride material has a rod-like structure with a diameter ranging from 150 to 200 nm and a length of 1 to 2 μm. The electrochemical performance test results show that the composite material has a reversible capacity of 320mAh / g at a current density of 50mA / g.

Embodiment 3

[0033] The operation method is the same as in Example 1, the reaction temperature is 600°C, and other conditions are kept unchanged. SEM analysis shows that the prepared carbon-coated ferric fluoride material has a rod-like structure, with a diameter ranging from 100 to 250 nm and a length of 2 to 3 μm. The electrochemical performance test results show that the composite material has a reversible capacity of 250mAh / g at a current density of 50mA / g.

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Abstract

The invention discloses a charcoal-coated metal fluoride nano material with a core-shell structure, a preparation method and application of the nano material in the field of lithium ion battery positive electrodes. The nano material is of a core-shell structure; the shell layer is charcoal; the core layer is metal fluoride; the nano material has high specific capacity and good cyclic stability by being taken as the positive electrode material of a lithium ion battery. The nano material with the core-shell structure can be prepared through the processes of mixing, pyrolysis and solvent washing of a raw material metal compound and a fluorine-containing compound, has the characteristics of abundant source of raw material, simple process, low material preparation cost, high purity, wide metal choice range and the like, and facilitates large-scale production.

Description

technical field [0001] The invention relates to the field of nanocomposite materials, in particular to a composite cathode material for a lithium ion secondary battery and a preparation method thereof. Background technique [0002] At present, the commercialized cathode materials are lithium cobalt oxide and other materials. Its specific capacity is low, and it is not suitable for fast charging and discharging, which is the bottleneck restricting the development of lithium-ion batteries. Therefore, it is urgent to develop a new generation of cathode materials with high capacity, high rate performance, low cost, long life, safety and reliability to replace commercial lithium cobalt oxide and other cathode materials. Transition metal fluorides (such as FeF 3 , FeF 2 、NiF 2 、CuF 2 etc.) can undergo a reversible conversion reaction with lithium ions, has the advantages of high theoretical specific capacity, environmental friendliness, and low cost, and is expected to become...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M10/0525B82Y30/00B82Y40/00
CPCY02E60/122B82Y30/00B82Y40/00H01M4/582H01M4/625H01M10/0525H01M2004/021Y02E60/10
Inventor 周继升宋怀河张迪陈晓红马兆昆
Owner HANGZHOU INST OF ADVANCED MATERIAL BEIJING UNIV OF CHEM TECH
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