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Nano ferric phosphate hollow sphere lithium ion battery and preparation method thereof

A lithium-ion battery and nano-iron phosphate technology, applied in the manufacture of electrolyte batteries, battery electrodes, secondary batteries, etc., can solve the problems of poor electronic conductivity, limited electrochemical performance of LiFePO4, low diffusion rate, etc., and achieve good discharge performance , easy to popularize and produce on a large scale, good dispersion effect

Inactive Publication Date: 2011-09-14
NANJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But since LiFePO 4 Due to its own structural characteristics and the large particle size of the material prepared by the traditional high-temperature sintering method, the electronic conductivity inside the material is poor. + In LiFePO 4 The diffusion rate in the particles is very low, which greatly limits the LiFePO 4 electrochemical performance

Method used

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  • Nano ferric phosphate hollow sphere lithium ion battery and preparation method thereof
  • Nano ferric phosphate hollow sphere lithium ion battery and preparation method thereof
  • Nano ferric phosphate hollow sphere lithium ion battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Take 1.2 g of precipitant urea and 0.1 g of surfactant sodium dodecyl sulfate (SDS) and disperse them in 20 ml of deionized water, and add ferrous ammonium sulfate hexahydrate ((NH 4 ) 2 Fe(SO 4 ) 2 ·6H 2 O) and phosphoric acid (H 3 PO 4 ), the amount of ferrous ammonium sulfate hexahydrate was 0.1 mmol. Place the mixture in an ultrasonic wave for ultrasonic dispersion for 2-10 minutes, and pour it into a stainless steel reaction kettle lined with polytetrafluoroethylene after the dispersion is uniform, close the reaction kettle, place it in an oven and heat it at 60-100 °C for 10 hours, and cool it to room temperature. The product was washed by centrifugation with ethanol and deionized water for 6 times, and the product obtained by centrifugation was placed in an oven at 50-100 °C for 10-24 h in vacuum to obtain nano-iron phosphate hollow spheres with a particle size of about 150-250 nm and an average particle size of The diameter is around 200 nm.

[0034] Accor...

Embodiment 2

[0037] Take 1.2 g urea and 0.1 g SDS and disperse them in 20 ml deionized water, add equimolar (NH 4 ) 2 Fe(SO 4 ) 2 ·6H 2 O and H 3 PO 4 , the amount of substance of ferrous ammonium sulfate hexahydrate was 0.1 mmol. Place the mixture in an ultrasonic wave for ultrasonic dispersion for 2-10 minutes. After the dispersion is uniform, pour it into a stainless steel reaction kettle lined with polytetrafluoroethylene, close the reaction kettle, and heat it in an oven at 60-100 °C for 12 hours, then cool it down. to room temperature. The product was centrifuged and washed with ethanol and deionized water for 8 times, and the product obtained by centrifugation was placed in an oven at 50-100 ℃ for 10-24 h in vacuum to obtain nano-iron phosphate hollow spheres with a particle size of about 150-250 nm, with an average The particle size is around 200 nm.

[0038] The preparation process of the lithium-ion battery is exactly the same as in Example 1. When the charging current de...

Embodiment 3

[0040] Take 0.6 g urea and 0.05 g SDS and disperse them in 20 ml deionized water, add (NH 4 ) 2 Fe(SO 4 ) 2 ·6H 2 O and H 3 PO 4 , the amount of the substance of ferrous ammonium sulfate hexahydrate is 0.05 mmol. Place the mixture in an ultrasonic wave for ultrasonic dispersion for 2-10 minutes. After the dispersion is uniform, pour it into a stainless steel reaction kettle lined with polytetrafluoroethylene, close the reaction kettle, and heat it in an oven at 60-100 °C for 3-12 hours. , cooled to room temperature. Wash the product by centrifugation with ethanol and deionized water for 3-8 times respectively, and place the product obtained by centrifugation in an oven at 50-100 ℃ for 10-24 h in vacuum to obtain nano-iron phosphate hollow spheres with a particle size of about 200-300 nm , with an average particle size of about 250 nm.

[0041] The preparation process of the lithium-ion battery is exactly the same as in Example 1. When the charging current density of th...

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Abstract

The invention provides a lithium ion battery using nano ferric phosphate hollow sphere as anode material. The lithium ion battery comprises a positive electrode plate, a negative electrode plate, an electrolyte and a membrane. The battery is characterized in that the positive active material of the positive electrode plate is nanoscale hollow-sphere-shaped ferric phosphate with an average particle diameter of about 150-280nm. The nano ferric phosphate hollow sphere is synthesized by low temperature hydrothermal method. According to the invention, the lithium ion battery uses the nano ferric phosphate hollow sphere as positive active material, wherein the positive active material ferric phosphate with a nonscale hollow-sphere-shaped structure has low density and good dispersity, and the diffusion and transmission rate of Li <+> and electrons is high in the positive active material. The lithium ion battery prepared on the basis of the positive active material has the characteristics of good discharging performance, high cyclical stability and large specific capacity. The invention also discloses a preparation method of the lithium ion battery.

Description

technical field [0001] The invention relates to a lithium ion battery in which the cathode material is nano-iron phosphate hollow spheres and a preparation method thereof, belonging to the fields of material preparation and energy batteries. Background technique [0002] Lithium-ion batteries have been widely used in portable electronic products and communication tools in recent years because of their excellent environmental protection properties. They also have broad applications in the power plant applications of electric vehicles (EV) and hybrid electric vehicles (HEV) Therefore, improving the performance of lithium-ion batteries is a hot research topic at present. Among them, the selection of electrode materials is a key determinant of the performance of lithium-ion batteries. [0003] Since Goodenough et al first reported the LiFePO with olivine structure 4 After having reversible de-lithiation / intercalation characteristics, because of its low price, environmental fri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0525H01M4/136H01M4/58H01M10/058
CPCY02E60/122Y02E60/10Y02P70/50
Inventor 蔡称心印亚静吴萍张卉
Owner NANJING NORMAL UNIVERSITY
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