Mg secondary cell

A magnesium secondary battery and electrolyte technology, applied in secondary batteries, secondary battery manufacturing, battery electrodes, etc., to achieve great development and application prospects, broad development prospects and application scope, and improve the effect of discharge specific capacity

Inactive Publication Date: 2007-01-31
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is different from the method for preparing doped vanadium oxide nanotubes disclosed in CN03125385.7, and the doped vanadium oxide nanotubes and micron rod-shaped MoO 3 There is no report as a cathode material for magnesium batteries

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Example 1: Preparation of vanadium oxide nanotubes and their electrochemical performance tests

[0040] Preparation of Vanadium Oxide Nanotubes

[0041] Add 10mmol of V 2 o 5 (A.R. grade) and 10mmol of octadecylamine (A.R. grade, Fluka) were added to 5ml of absolute ethanol and stirred for 2h; then added 15ml of deionized water and continued to stir for 48h; the mixture was transferred to a stainless steel reactor with a polytetrafluoroethylene substrate, React at a constant temperature of 180°C for 7 days; finally, after repeated washing with absolute ethanol and n-hexane, dry in a vacuum oven at 70°C for 6 hours to obtain a black product (VO x -NTs), yield>90%.

[0042] Copper, silver-doped vanadium oxide nanotubes (denoted as: Cu y -doped VO x -NTs, Ag y -doped VO x -NTs) preparation:

[0043] Polycrystalline V 2 o 5 (1g) added to 100ml 10% H 2 o 2 In the middle, the container is cooled with water, and after the solution is stirred for about 2 hours, O 2...

Embodiment 2

[0052] Example 2: Cu 0.1 -doped VO x - Electrochemical properties of NTs

[0053] We assemble the battery condition by embodiment 1 with the Cu prepared by embodiment 1 0.1 Doped vanadium oxide nanotube active materials were assembled into simulated batteries and tested under different discharge current densities. attached Figure 5 It can be seen from the figure that the curve relationship shows that when the battery is discharged at a current density of 10mA / g, the initial discharge capacity is the highest and the cycle efficiency is also good. The undoped vanadium oxide nanotubes have the best cycle performance when the current density is 5mA / g, and the initial discharge capacity is only 81mAh / g, and the doped nanotubes Cu 0.1 -doped VO x The capacity of -NTs can reach 120.2mAh / g when the maximum discharge current density is 10mA / g. It shows that after vanadium oxide nanotubes are doped, the cycle performance and high current discharge performance are improved and enh...

Embodiment 3

[0054] Example 3: Ag y -doped VO x - Electrochemical properties of NTs (y=0.1, 0.2, 0.3)

[0055] We assemble the battery condition by embodiment 1 the Ag that embodiment 1 prepares y -doped VO x - NTs (y=0.1, 0.2, 0.3) active materials were assembled into a simulated battery and tested at a discharge current density of 5mA / g. attached Figure 6 is the initial discharge capacity curve of vanadium oxide nanotubes with different Ag-doped metal contents at a discharge current density of 5 mA / g (A1: Ag 0.1 -dopedVO x -NTs, A2: Ag 0.2 -doped VO x -NTs, A3: Ag 0.3 -doped VO x -NTs), it can be seen from the curve that when the Ag doping percentage is 20mol% of the vanadium oxide, the initial discharge specific capacity of the simulated battery is the highest, reaching 108.4mAh / g.

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Abstract

The invention relates to an Mg secondary cell, comprising vanadium oxide nanotube or molybdenum oxide active material as anode, Mg as cathode, Mg(AlBu2Cl2)2 as electrolyte and diaphragm celgard 2300, where the nanotube comprises metallic cation-doped vanadium oxide nanotube, the doping metallic cations account for 10 mol%-30 mol% of the vanadium oxide, and the doping metallic cations are copper or silver ions. And it has higher initial discharge specific capacity and powerful discharge property. And it has advantages of low price and good safety and as a power battery, has great application and development prospects.

Description

technical field [0001] The invention belongs to a magnesium secondary battery, which is a magnesium secondary battery using vanadium oxide nanotubes, doped vanadium oxide nanotubes and molybdenum oxides as positive active materials. Background technique [0002] New energy storage systems such as secondary batteries are widely used in electric vehicles and other equipment. At present, electrochemical research mainly focuses on lithium secondary batteries. However, considering that metal magnesium has: abundant natural resources; low capacity equivalent (such as: Mg: 12g / F, Li: 7g / F, Na: 23g / F); relatively low price and high safety performance, etc., making the metal Magnesium is expected to become a new negative electrode material for secondary batteries 41:445.]. [0003] The working principle of the magnesium secondary battery with metal magnesium as the negative electrode is as follows: ① When the battery is charged, Mg 2+ Deintercalation from the intercalable cathode...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/48H01M4/36H01M4/04C01G31/00B82B3/00C01G39/00H01M10/04H01M10/36
CPCY02E60/12Y02E60/10Y02P70/50
Inventor 焦丽芳袁华堂王一菁
Owner NANKAI UNIV
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