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Lithium battery anode material based on lithium ferrite as well as preparation method and application thereof

A negative electrode material, lithium ferrite technology, applied in battery electrodes, non-aqueous electrolyte battery electrodes, secondary batteries, etc., can solve the problems of poor transmission and diffusion performance, poor cycle stability, low rate performance, etc., and achieve excellent long cycle. Effects of stability and rate capability, phase uniformity, and low energy consumption

Active Publication Date: 2019-05-14
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, Fe 3 o 4 As a negative electrode material, significant volume changes and severe particle agglomeration and particle pulverization will occur during the lithium insertion and removal process, resulting in charge and Li + Poor transmission and diffusion performance, poor cycle stability and low rate performance, and low first Coulombic efficiency

Method used

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  • Lithium battery anode material based on lithium ferrite as well as preparation method and application thereof
  • Lithium battery anode material based on lithium ferrite as well as preparation method and application thereof
  • Lithium battery anode material based on lithium ferrite as well as preparation method and application thereof

Examples

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Effect test

Embodiment 1

[0046] In a lithium battery negative electrode material based on lithium ferrite, the preparation method of its lithium ferrite is:

[0047] Direct use of iron oxide (Fe 2 o 3 ) powder (XRD figure see figure 1 (a)) is the working cathode, and graphite is used as the working anode, wherein the electrolyte is LiCl, the electrolysis temperature is 660°C, the electrolysis voltage is 1V, the electrolysis time is 60min, the heating rate before electrolysis and the cooling rate after electrolysis are equal 3°C / min. During the electrolysis process, the argon gas flow into the electrolytic cell is 600mL / min. The electrolytic cell is connected with a U-shaped quartz tube, and the U-shaped quartz tube is filled with deionized water. After the argon gas flows through the U-shaped quartz tube, the moist argon gas flows into the In a sealed reactor, electrolysis is carried out under a protective atmosphere of molten salt containing water vapor. After the electrolysis experiment, the cat...

Embodiment 2

[0059] In a lithium battery negative electrode material based on lithium ferrite, the preparation method of its lithium ferrite is: the same as in Example 1, the difference is:

[0060] (1) The iron oxide powder is pressed (20MPa, holding pressure for 10 minutes), and then sintered at a constant temperature of 800°C for 2 hours to obtain a sheet-shaped cathode;

[0061] (2) The electrolysis voltage is 0.7V, the electrolysis time is 120min, and the electrolysis temperature is 450°C;

[0062] (3) The chemical composition of the electrolyte is LiCl-KCl (wherein LiCl is 59.2 mol%, KCl is 40.8 mol%);

[0063] A lithium battery negative electrode material based on lithium ferrite, including the lithium ferrite prepared above, as well as conductive carbon, binder and solvent; wherein, according to the mass ratio, lithium ferrite: conductive carbon = 2: 1, bonded The added mass of the agent accounts for 11.1% of the total mass of lithium ferrite + conductive carbon, and according to ...

Embodiment 3

[0070] Method is with embodiment 1, and difference is:

[0071] (1) The electrolysis voltage is 0.9V, the electrolysis time is 20min, and the electrolysis temperature is 590°C;

[0072] (2) The chemical composition of the electrolyte is LiCl-SrCl 2 (64.3:35.7mol%);

[0073] (3) Weigh 6 g of lithium ferrite prepared under the conditions, 3 g of conductive carbon and 1 g of binder, mix and grind, add 80 mL of N-methylpyrrolidone, and stir magnetically for 10 h. The adjusted slurry was coated on copper foil to make electrode sheets, which were sliced ​​and pressed and then used as counter electrodes with lithium sheets, and assembled into CR2025 button cells in a glove box. The electrochemical performance test was carried out on a constant current charge-discharge system at a rate of 200mA / g.

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Abstract

The invention relates to a lithium battery anode material based on lithium ferrite as well as a preparation method and application thereof and belongs to the field of preparation and application of lithium ion battery electrode materials. The lithium battery anode material based on lithium ferrite comprises lithium ferrite as well as conductive carbon, a binder and a solvent, wherein a chemical formula of lithium ferrite is Li2Fe3O5, morphology of lithium ferrite is particles of an octahedral structure, and particle size is 0.2-10[mu]m. The preparation method of the lithium battery anode material comprises the following steps: mixing all the substances, and stirring, so that the lithium battery anode material is obtained. A lithium battery can be prepared by adopting the anode material. The method provided by the invention prepares a lithium ion anode material on the basis of a lithium ferrite material of the octahedral structure, not only conductivity is improved, but also great volume change of lithium ions in intercalation and deintercalation processes is alleviated, so that electrochemical stability of the lithium ion anode material is improved, the problem that graphite has relatively low theoretical specific capacity when being taken as the traditional lithium ion battery anode material can be thoroughly solved, and the development obstacle that specific capacity of a lithium ion battery is relatively low is overcome.

Description

technical field [0001] The invention belongs to the field of preparation and application of lithium-ion battery electrode materials, and in particular relates to a lithium-ion battery negative electrode material based on lithium ferrite and a preparation method and application thereof. Background technique [0002] Lithium battery, because of its high working voltage and specific energy, fast charging and discharging, and high safety performance, is regarded as a common energy storage device with broad market prospects and rapid development. It has a very wide range of applications in daily life. Applications. How to improve the capacity and stability of lithium batteries is an important problem to be solved urgently. [0003] As the acceptor of lithium ions, the negative electrode material must maintain a good structure, good chemical stability, high electronic conductivity and lithium ion conductivity during the lithium ion intercalation process. At the same time, the neg...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M4/58H01M4/62H01M10/0525
CPCH01M4/13H01M4/58H01M4/62H01M10/0525Y02E60/10
Inventor 阿里·雷扎·卡马里孙蔷谢开钰
Owner NORTHEASTERN UNIV
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