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Flexible water-based sodium-ion batteries and preparation method thereof

A sodium-ion battery and water-based technology, applied to secondary batteries, circuits, electrical components, etc., to achieve low cost, good rate performance, and light weight

Inactive Publication Date: 2017-02-01
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to its great safety advantages and low cost, more and more related work has been carried out around it, and it has broad development prospects. However, there is still no report on making it into a flexible aqueous sodium-ion battery. In view of its high safety and low cost advantages, it is possible to realize a wider range of applications in the future

Method used

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  • Flexible water-based sodium-ion batteries and preparation method thereof
  • Flexible water-based sodium-ion batteries and preparation method thereof
  • Flexible water-based sodium-ion batteries and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment 1: based on Na 0.44 MnO 2 Cathode and NaTi 2 (PO 4 ) 3 Ribbon-shaped flexible aqueous sodium-ion battery with / C negative electrode.

[0029] Take Na 0.44 MnO 2 as the positive active material. The preparation of the positive electrode film is as follows: first prepare the positive electrode material Na 0.44 MnO 2 . The specific steps are: the precursor Na 2 CO 3 and Mn 3 o 4 Mix at a ratio of 0.726:1, grind and mix evenly by hand; then roast the mixture in a muffle furnace at 500 degrees for 5 hours; then perform ball milling at a speed of 300 rpm for 10 hours, and then place it in a muffle furnace for roasting at 900 degrees 10 hours to get Na 0.44 MnO 2 . According to the active substance (Na 0.44 MnO 2 ): Acetylene black: PTFE (20%) = 80:10:10 Ratio roll out the film, dry the active material film and cut it into strips with a size of 1×5 cm, Na 0.44 MnO 2 Loaded at 10 mg cm -2 . NaTi 2 (PO 4 ) 3 / C is the negative electrode acti...

Embodiment 2

[0030] Embodiment 2: based on Na 0.44 MnO 2 Cathode and NaTi 2 (PO 4 ) 3 Comparison of charge-discharge curves of ribbon-shaped flexible aqueous sodium-ion batteries with / C anode under different bending angles.

[0031] The ribbon-shaped aqueous sodium-ion battery prepared in Example 1 was separated at 0.2 A g -1 Under the current density, bend 100 times in six bending states of 0°, 45°, 90°, 135°, 180°, and bend into a ring, and then conduct charge and discharge tests. After comparison, it is found that after bending at different angles, the battery capacity It is basically not affected by bending, and still has good cycle performance. The average charge and discharge platform is around 1.1V at each bending angle, and there is basically no capacity fading (Table 1), which fully demonstrates its good bending performance. performance.

Embodiment 3

[0032] Embodiment 3: Based on Na 0.44 MnO 2 Cathode and NaTi 2 (PO 4 ) 3 Wire-shaped flexible aqueous sodium-ion battery with / C negative electrode.

[0033] In CNT / / Na 0.44 MnO 2 The composite fiber is a positive electrode active material. Spinnable CNT arrays were first prepared according to the chemical vapor deposition method. The specific method is: successively deposit aluminum oxide (Al 2 o 3 ) and iron (Fe), where Al 2 o 3 For the buffer layer, Fe is the catalyst. Silicon wafer thickness is 400 μm, Al 2 o 3 The layer thickness is 3 nm and the Fe layer thickness is 1.2 nm. First, put the silicon wafer coated with the catalyst into the center of the tube furnace, and adjust the flow rate of the ventilation pipe as follows: Argon: 400 sccm; Hydrogen: 30 sccm; Ethylene: 90 sccm. First pass argon only for 10 minutes, remove the air in the pipeline, then pass hydrogen and ethylene, control the tube furnace to rise from room temperature to 740°C in 15 minutes,...

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Abstract

The invention belongs to the technical field of energy storage devices, and in particular relates to flexible water-based sodium-ion batteries and a preparation method thereof. The flexible water-based sodium-ion batteries take sodium manganate as a positive active material and carbon-coated sodium-titanium phosphate as a negative active material; the flexible water-based sodium-ion batteries with excellent electrochemical performance are prepared from the sodium manganate and the carbon-coated sodium-titanium phosphate according to an appropriate mass ratio; the two types of flexible water-based sodium-ion batteries are a two-dimension band-shaped flexible water-based sodium-ion battery and a one-dimensional thread-shaped flexible water-based sodium-ion battery. The band-shaped flexible water-based sodium-ion battery takes soft stainless steel as a current collector; the thread-shaped water-based sodium-ion battery enables the active materials to be rolled into an orientation carbon nano tube (CNT) to prepare composite fibers, and the CNT is used as a current collector and a conductive additive at the same time, so that the mass and volume of the battery are reduced, the flexibility of the battery is improved, and the thread-shaped water-based sodium-ion battery is easy to weave and integrate. The two-dimension band-shaped flexible water-based sodium-ion battery and the one-dimensional thread-shaped flexible water-based sodium-ion battery have excellent electrochemical performance, and have the advantages of being light in mass, low in cost, high in flexibility and safety, environmental-friendly, and the like, thus providing possibility for the application in the field of wearable electronic devices. The thread-shaped flexible water-based sodium-ion battery can even be implanted in a human body for assisting health monitoring and treatment of diseases.

Description

technical field [0001] The invention belongs to the technical field of energy storage devices, and in particular relates to a flexible water-based sodium-ion battery and a preparation method thereof. Background technique [0002] With the continuous improvement of people's pursuit of living and production levels, flexible, portable and wearable electronic devices have developed rapidly, such as biosensors, smart bracelets, smart phones, light-emitting diodes and solar cells and other flexible electronic devices have increasingly attracted people's extreme attention. big concern. However, the energy storage system for powering flexible electronic devices must not only have good bendability, but also maintain the structural integrity and electrochemical performance of the device itself during the bending process. Currently developed traditional energy storage systems such as batteries and supercapacitors are poorly flexible due to the use of non-bendable electrodes, current c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/36H01M10/38
CPCH01M10/36H01M10/38Y02E60/10Y02P70/50
Inventor 王永刚夏永姚郭昭薇董晓丽赵阳彭慧胜
Owner FUDAN UNIV
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