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Lithium ion battery made of hollow porous nickel oxide composite material on basis of coating of N-doped carbon layer, and preparation method thereof

A lithium-ion battery, hollow porous 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 nickel oxide, battery cycle performance, and low lithium ion diffusion rate. , to achieve the effects of good discharge performance, reduced migration and diffusion rates, and high cycle stability

Inactive Publication Date: 2014-03-26
NANJING NORMAL UNIVERSITY
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0004] However, due to the structural characteristics of nickel oxide itself and the large particle size of materials prepared by traditional methods, the electronic conductivity inside the material is poor, and the diffusion rate of lithium ions in nickel oxide particles is very low, which greatly limits the performance of nickel oxide. Electrochemical properties and cycle performance of batteries

Method used

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  • Lithium ion battery made of hollow porous nickel oxide composite material on basis of coating of N-doped carbon layer, and preparation method thereof
  • Lithium ion battery made of hollow porous nickel oxide composite material on basis of coating of N-doped carbon layer, and preparation method thereof
  • Lithium ion battery made of hollow porous nickel oxide composite material on basis of coating of N-doped carbon layer, and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0041] In 20 mL of ethylene glycol, 0.895 g of nickel chloride hexahydrate, 1.23 g of sodium acetate, and 1.2 g of urea were added respectively, and the mixture was magnetically stirred at 20-25 °C for 3-5 h. After mixing evenly, pour it into a stainless steel reactor lined with polytetrafluoroethylene, heat in an oven at 160-200 °C for 18-24 h, and cool to room temperature. After the obtained product was centrifuged and washed with ethanol and deionized water for 6 to 8 times, it was placed in a drying oven at 60 to 100 °C for 12 to 24 h under vacuum to obtain precursor nickel bicarbonate nanoparticles with a particle size of about 200 to 300 nm. Add 3 mg of the precursor to 5 mL of 1-butyl-3-methylimidazolium tetrafluoroborate ionic liquid, and disperse by ultrasonication for 5 to 15 min. Put the dispersion liquid in a stainless steel reaction kettle lined with polytetrafluoroethylene, solvothermally treat it at 160-200 °C for 3-5 h, cool to room temperature, and centrifuge...

Embodiment 2

[0045] In 20 mL of ethylene glycol, 1.0 g of nickel chloride hexahydrate, 1.23 g of sodium acetate, and 0.8 g of urea were added respectively, and the mixture was magnetically stirred at 20-25 °C for 3-5 h. After mixing evenly, pour it into a stainless steel reactor lined with polytetrafluoroethylene, heat at 160-200 °C for 18-24 h, and cool to room temperature. After the obtained product was centrifuged and washed with ethanol and deionized water for 6 to 8 times, it was placed in a drying oven at 60 to 100 °C for 12 to 24 h under vacuum to obtain precursor nickel bicarbonate nanoparticles with a particle size of about 200 to 300 nm. Add 80 mg of this precursor to 10 ml of 1-butyl-3-methylimidazolium tetrafluoroborate ionic liquid, and ultrasonically disperse for 5-15 min. Place the dispersed solution in a stainless steel reaction kettle lined with polytetrafluoroethylene, treat it with solvothermal method at 160-200 °C for 3-5 h, cool to room temperature, and centrifuge the...

Embodiment 3

[0048] The charge-discharge curve ( Figure 6 ) and the charge-discharge curve at a current density of 0.1C ( Figure 5 ). The test results show that under the same conditions of other operations, the charging current density is changed to 0.3 C, and the discharge specific capacity of the obtained lithium-ion battery is about 587.3 mAh / g ( Figure 6 curve b); the charge current density is changed to 1.0 C, and the discharge specific capacity is about 479.4 mAh / g ( Figure 6 curve c); the charging current density is changed to 10 C, and the discharge specific capacity of the lithium-ion battery is about 347.6 mAh / g ( Figure 6 Curve d). The cycle performance test of discharge shows that the lithium-ion battery cycle performance is good ( Figure 5 ).

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Abstract

The invention relates to a lithium ion battery made of a hollow porous nickel oxide composite material, and the negative electrode material of the lithium ion battery is wrapped by an N-doped carbon layer. The lithium ion battery comprises a negative electrode plate, a positive electrode plate, a bath solution and a membrane, and is characterized in that the active material of the negative electrode plate is the hollow porous nickel oxide composite material coated by an N-doped carbon layer and formed by taking an ionic liquid as a coating agent, the grain diameter of the hollow porous nickel oxide composite material is 200 to 300 nm, and the surface of the hollow porous nickel oxide composite material is coated with the N-doped carbon layer thin film distributed evenly. According to the lithium ion battery provided by the invention, the negative electrode material has a hollow porous structure coated by the unique N-doped carbon layer, the grain diameter is small, the dispersity is good, the conductivity performance of the material is good, lithium-ion and electron have a fast diffusion rate and transmission rate in the material, the lithium ion battery constructed on the basis of the material has the characteristics of good discharging performance, high cyclic stability and high capability. The invention further provides a preparation method of the lithium ion battery.

Description

technical field [0001] The invention relates to a lithium-ion battery and a preparation method thereof, in particular to a lithium-ion battery whose negative electrode material is a hollow porous nickel oxide composite material wrapped by a nitrogen-doped carbon layer and a preparation method thereof, belonging to the field of material preparation and energy batteries . Background technique [0002] Due to its high energy density, high output voltage, good cycle performance, long service life, and environmental protection, lithium-ion batteries have been widely used in portable electronic products, military industry, aerospace and other fields in recent years. There are also broad prospects in the field of power plant applications for automobiles (EV) and hybrid electric vehicles (HEV), so improving the performance of lithium-ion batteries is a current research hotspot. Among them, the selection of electrode materials is a key factor affecting the performance of lithium-ion...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/525H01M10/058
CPCY02E60/122H01M4/366H01M4/523H01M4/625H01M10/0525H01M10/058Y02E60/10Y02P70/50
Inventor 蔡称心倪叶猛吴萍印亚静张卉
Owner NANJING NORMAL UNIVERSITY
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