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Sodium lithium titanate nanowire and preparation method thereof

A sodium nano and lithium titanate technology, applied in titanate, nanotechnology, nanotechnology and other directions, can solve problems such as poor electrochemical performance, and achieve the effects of excellent performance, good capacity retention, and high initial discharge specific capacity.

Active Publication Date: 2016-09-21
滨州市科创孵化器有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem of poor electrochemical performance of the existing lithium sodium titanate negative electrode material, and to provide a lithium ion battery negative electrode material lithium sodium titanate NaLiTiO 3 Preparation method of nanowire

Method used

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  • Sodium lithium titanate nanowire and preparation method thereof
  • Sodium lithium titanate nanowire and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] 0.15mmol of NaCH 3 COO was dissolved in 2 mL dimethylformamide (DMF) to form solution A; 0.15 mmol LiCH 3 Dissolve COO in 5 mL of absolute ethanol to form solution B; dissolve 0.3 mmol of isopropyl titanate in 3 mL of dimethylformamide (DMF) to form solution C; mix solutions A, B and C evenly and add 2 mL of glacial acetic acid and 1.2g polyvinyl alcohol, stirred for 2h to form a clear solution D; the clear solution D was electrospun at a voltage of 15kv and a flow rate of 0.8mL / h; the obtained electrospun product was dried in an oven at 60°C 4h; transfer the dried electrospinning product to a muffle furnace and sinter at 600°C for 6h to obtain lithium sodium titanate NaLiTiO 3 Nanowires. The nanowires were characterized by powder diffraction (XRD), as figure 1 shown. Observe the morphology of the nanowires with a scanning electron microscope, such as figure 2 shown.

Embodiment 2

[0023] 0.15mmol of NaHCO 3 Dissolve in 2mL dimethylformamide (DMF) to form solution A; dissolve 0.225mmol of LiF in 5mL of absolute ethanol to form solution B; dissolve 0.525mmol of isopropyl titanate in 3mL of dimethylformamide ( DMF) to form solution C; after mixing solutions A, B and C evenly, add 1.5mL glacial acetic acid and 1.1g polyvinyl alcohol, stir for 2h to form clear solution D; put clear solution D at a voltage of 20kv and a flow rate of 1.2 Electrospinning was carried out at mL / h; the obtained electrospinning product was dried in an oven at 90°C for 4 hours; the dried electrospinning product was transferred to a muffle furnace, and sintered at 800°C for 3 hours to obtain a lithium-ion battery negative electrode Material lithium sodium titanate NaLiTiO 3 Nanowires.

Embodiment 3

[0025] 0.15mmol of NaCH 3 COO was dissolved in 2 mL of dimethylformamide (DMF) to form solution A; 0.15 mmol of LiNO 3 Dissolve in 5mL of absolute ethanol to form solution B; dissolve 0.45mmol of isopropyl titanate in dimethylformamide (DMF) to form solution C; mix solutions A, B, and C evenly and add 1.5mL of glacial acetic acid and 1.2g polyvinyl alcohol, stirred for 2h to form a clear solution D; the clear solution was electrospun at a voltage of 18kv and a flow rate of 1.0mL / h; the obtained electrospun product was dried in an oven at 80°C for 4h ; Transfer the dried electrospinning product to a muffle furnace and sinter at 700°C for 5 hours to obtain lithium sodium titanate NaLiTiO, a negative electrode material for lithium-ion batteries. 3 Nanowires.

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Abstract

The invention discloses a preparation method for preparing a sodium lithium titanate nanowire. According to the invention, a certain amount of lithium salt, sodium salt and titanium salt is dissolved in a mixed solution of dimethylformamide and ethanol. Meanwhile, glacial acetic acid and a polymer are added to form a clear solution. The clear solution is subjected to electrostatic spinning under a certain voltage and at a certain volumetric flow rate. The product of the electrostatic spinning is dried at a constant temperature, and then is sintered at a high temperature to obtain the corresponding NaLiTiO3 sodium lithium titanate nanowire. According to the technical scheme of the invention, the electrochemical performance and the lithium storage performance of the sodium lithium titanate nanowire are studied. Meanwhile, the NaLiTiO3 sodium lithium titanate nanowire as lithium ion battery cathode materials is successively prepared. The nanowire is excellent in physical and chemical properties. Electrochemical experiments prove that, the prepared NaLiTiO3 sodium lithium titanate nanowire as lithium ion battery cathode materials is wide in application prospect. The entire preparation process is simple in operation, low in raw material cost, small in equipment investment, and suitable for batch production.

Description

technical field [0001] The invention belongs to the field of lithium ion battery materials, and in particular relates to a lithium ion battery negative electrode material NaLiTiO 3 A preparation method of lithium sodium titanate nanofibers. Background technique [0002] As a potential lithium-ion battery material, lithium-sodium titanate compound has the advantages of good ionic conductivity, high theoretical capacity, and no solid electrolyte interface (SEI) film formed during charging and discharging. Materials assembled into batteries can obtain lithium-ion batteries with high output voltage, safety, and long cycle life, and are expected to meet the power requirements of electric vehicles. However, the large rate performance of lithium sodium titanate negative electrode material is poor. [0003] There are many ways to solve the high-rate performance of lithium sodium titanate negative electrode materials, and the most effective way is to nanometerize the material. The...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/00B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00C01G23/005C01P2002/72C01P2004/03C01P2004/16C01P2004/64
Inventor 李星吴显宗朱聪聪
Owner 滨州市科创孵化器有限公司
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