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Nanometer iron-lithium oxide composite negative electrode material and preparation method thereof

A negative electrode material and lithium oxide technology, which is applied in the field of nanometer iron-lithium oxide composite negative electrode material and its preparation, can solve the problems of low electrochemical activity, reduced electrochemical performance of iron-lithium oxide, low capacity retention rate, etc. The preparation process is simple, the electrochemical performance is good, and the effect of a wide concentration range

Active Publication Date: 2014-02-05
ADVANCED TECHNOLOGY & MATERIALS CO LTD
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Problems solved by technology

[0005] It can be seen that the nanomaterials obtained by using solid-phase sintering method, exchange reaction method, hydrothermal method, etc. 2 material, and this single LiFeO 2 The electrochemical activity of the material is low, and the capacity retention rate is low, which greatly reduces the electrochemical performance of lithium iron oxide, and it is only used as a positive electrode material, thus limiting the application of this material in lithium-ion batteries

Method used

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  • Nanometer iron-lithium oxide composite negative electrode material and preparation method thereof
  • Nanometer iron-lithium oxide composite negative electrode material and preparation method thereof
  • Nanometer iron-lithium oxide composite negative electrode material and preparation method thereof

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Embodiment 1

[0044] Ferric chloride hexahydrate (FeCl3 6H2O), ammonium dihydrogen phosphate (NH 4 h 2 PO 4 ) (the molar ratio of ferric chloride hexahydrate to ammonium dihydrogen phosphate is 26:1) and deionized water were used as the experimental raw materials, put them into the reaction kettle, at 220°C, the hydrothermal reaction time was 4h, and naturally cooled to room temperature. After the precipitate was separated by washing with deionized water and alcohol, iron oxide (Fe 2 o 3 )Nano stave. Then the iron oxide nanorods prepared by hydrothermal synthesis method and lithium hydroxide monohydrate (LiOH·H 2O) (the molar ratio of iron oxide nanorods and lithium hydroxide monohydrate is 1:2) was used as the raw material, and uniformly mixed. Finally, the mixed samples were calcined in air at 700°C for 10 hours. After cooling to room temperature, the obtained reddish-brown product is taken out, and the obtained reddish-brown product is the nano-iron lithium oxide composite negative...

Embodiment 2

[0051] Ferric chloride hexahydrate (FeCl 3 ·6H 2 O), ammonium dihydrogen phosphate (NH 4 h 2 PO 4 ) (the molar ratio of ferric chloride hexahydrate to ammonium dihydrogen phosphate is 26:1) and deionized water are used as experimental raw materials, put into the reaction kettle, at 200 ℃, hydrothermal reaction time 3h, and naturally cool to room temperature. After the precipitate was separated by washing with deionized water and alcohol, iron oxide (Fe 2 o 3 )Nano stave. The prepared nano-iron oxide (Fe 2 o 3 ) nanorod morphology such as Figure 6 shown. Then the iron oxide nanorods prepared by hydrothermal synthesis method and lithium hydroxide monohydrate (LiOH·H 2 O) (the molar ratio of iron oxide nanorods and lithium hydroxide monohydrate is 1:2) was used as the raw material, and uniformly mixed. Finally, the mixed samples were calcined in air at 700°C for 10 hours. After cooling to room temperature, the obtained reddish-brown product is taken out, and the obta...

Embodiment 3

[0053] Ferric chloride hexahydrate (FeCl 3 ·6H 2 O), ammonium dihydrogen phosphate (NH 4 h 2 PO 4 ) (the molar ratio of ferric chloride hexahydrate to ammonium dihydrogen phosphate is 30:1) and deionized water are used as experimental raw materials, put them into the reaction kettle, at 240 ℃, hydrothermal reaction time 10h, and naturally cool to room temperature. After the precipitate was separated by washing with deionized water and alcohol, iron oxide (Fe 2 o 3 )Nano stave.

[0054] The prepared nano-iron oxide (Fe 2 o 3 ) nanorod morphology such as Figure 7 shown. The subsequent calcination process is the same as in Example 1.

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Abstract

The invention belongs to the technical field of preparation of electrode materials for lithium ion batteries, and particularly relates to a nanometer iron-lithium oxide composite negative electrode material and a preparation method thereof. The material is a mixture or one of Li0.5F2.5O4 and LiFeO2, is a nanometer material and is uniform in size. The particle diameter of the prepared iron-lithium oxide material is about 250-300 nanometer. The preparation method of the material comprises the following steps: firstly preparing a ferric oxide (Fe2O3) nanorod through the hydrothermal reaction of ferric chloride hexahydrate (FeC13.6H2O) and ammonium dihydrogen phosphate (NH4H2PO4), then mixing the prepared ferric oxide (Fe2O3) nanorod with lithium hydroxide monohydrate (LiOH.H2O), and carrying out high-temperature calcination so as to prepare the nanometer iron-lithium oxide composite negative electrode material. The nanometer iron-lithium oxide composite negative electrode material has regular morphology, high purity and good electrochemical performance and is relatively uniform in size; the preparation method of the nanometer iron-lithium oxide composite negative electrode material is simple in process and is easy for large-scale industrial production.

Description

technical field [0001] The invention belongs to the technical field of preparation of electrode materials for lithium ion batteries, and in particular relates to a nano-iron lithium oxide composite negative electrode material and a preparation method thereof. Background technique [0002] Nanomaterials, due to their unique surface effects, small size effects, quantum effects and macroscopic quantum tunneling effects and their applications in magnetism, nonlinear optics, light emission, photoconductivity, thermal conductivity, catalysis, chemical activity, sensitive properties, electricity and thermal The peculiar properties exhibited by such aspects have aroused extensive attention of material scientists. They have important applications in many fields, such as lithium-ion batteries, sensors, optical and electroluminescent devices, energy conversion and storage devices, smart switches, and self-cleaning materials, etc. Lithium iron oxide itself has unique structural charact...

Claims

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Application Information

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IPC IPC(8): H01M4/48C01B25/45B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00C01G49/0027C01G49/009H01M4/364H01M4/525Y02E60/10
Inventor 曾宏武英戚雯况春江周少雄陈英陶涛
Owner ADVANCED TECHNOLOGY & MATERIALS CO LTD
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