Sodium ion battery negative electrode sheet and sodium ion battery

A sodium-ion battery and negative electrode technology, which can be applied to battery electrodes, secondary batteries, circuits, etc., can solve the problems that have not yet been found in the application of porous graphite membranes, and achieve good charge-discharge cycle stability, good conductivity, and stable performance Effect

Inactive Publication Date: 2015-10-07
QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, from the published literature reports and published patents, no application of porous graphite film prepared by laser etching method in the negative electrode of sodium ion battery has been found.

Method used

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  • Sodium ion battery negative electrode sheet and sodium ion battery
  • Sodium ion battery negative electrode sheet and sodium ion battery
  • Sodium ion battery negative electrode sheet and sodium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Negative pole piece preparation:

[0022] Take a self-made polyimide graphite film with a size of 20cm×20cm, and the thickness of the graphite film is 20 μm. Place the film on the sample placement platform of the laser drilling machine, adjust the laser etching parameters: power 20W, marking speed 1500mm / s, laser focal length 160mm, laser wavelength 1064nm, frequency 20kHz, the diameter of the holes and the distance between the holes respectively By adjusting the cutting diameter and hole distance of the laser beam, and turning on the power supply, the diameter of the circular hole is 50 μm, the distance between the holes is 240 μm, and the mass ratio of carbon atoms is 99.5%. figure 1 Its scanning electron microscope image.

[0023] The polyimide porous graphite film obtained above was cut into 4cm×3cm pole pieces by a slitting machine, dried in a vacuum oven at 120°C, and then used to prepare aluminum-plastic flexible packaging batteries.

[0024] Positive sheet pr...

Embodiment 2

[0031] The polyimide graphite film negative electrode base material in embodiment 1 is changed into expanded graphite film, and thickness is 25 μ m, adjusts punching parameter, makes the pore spacing of expanded graphite porous film be 280 μ m, and electrolytic solution is changed into 1mol / L three Sodium fluoromethyl sulfonate / tetraethylene glycol dimethyl ether, all the other processes are the same as in Example 1. The prepared sodium-ion battery was charged and discharged at a rate of 0.1C, and the charge and discharge curves were as follows: image 3 As shown, after 100 charge-discharge cycles, as Figure 5 The indicated capacity retention was 97.8%.

Embodiment 3

[0033] The polyimide graphite film negative electrode substrate in Example 1 is replaced by a graphene composite film, the thickness is 20 μm, and the punching parameters are adjusted so that the hole spacing of the graphene porous composite film is 260 μm, and the positive electrode material is changed to NaNi 0.5 mn 0.5 o 2, and the rest of the process is the same as in Example 1. The prepared sodium-ion battery was charged and discharged at a rate of 0.1C, and the charge and discharge curves were as follows: image 3 As shown, after 100 charge-discharge cycles, as Figure 5 The indicated capacity retention was 98.4%.

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Abstract

The present invention discloses a sodium ion battery negative electrode sheet, the negative electrode sheet is a porous graphite film structure, the diameter of the pores is from 2 to 30 microns, the distance between the centers of the circles of the pores is 5 to 50 microns, mass ratio of carbon atoms in the porous graphite film is greater than 99%, the negative electrode sheet may be used directly as the sodium ion battery negative electrode sheet, can avoid the use of a conductive agent, a binder and a metal collector, and has high capacity, corrosion resistance and good conductivity. The present invention also discloses a sodium ion battery using the negative electrode sheet, the sodium ion battery comprises a positive electrode sheet, a negative electrode sheet, a separator and an electrolyte, the sodium ion battery electrolyte solvent is one or more than one of diethanol dimethyl ether, dimethyl ether tetraethanol, and tetrahydrofuran, the electrolyte is one of sodium perchlorate, sodium hexafluorophosphate, sodium tetrafluoroborate and sodium trifluoromethanesulfonate, and the sodium ion battery is simple in production process and good in charging and discharging cycle stability, and has good prospects in the new energy field.

Description

technical field [0001] The invention relates to an electrochemical energy storage device, in particular to a negative electrode sheet of a sodium ion battery and a lithium ion capacitor using the negative electrode sheet. Background technique [0002] In the global trend of attaching great importance to climate change and energy conservation and carbon reduction, the new energy industry has become one of the strategic emerging industries in the new century. As an important support and auxiliary technology for the new energy industry, energy storage devices have attracted the attention of all parties. In my country, with the rapid development of pure electric vehicles and hybrid vehicles, the steady advancement of smart grids, the large-scale grid connection of renewable energy such as wind energy and solar energy, and the increase in regional peak loads, various application problems have also emerged. The energy density, power density, service life and cost of energy storage...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/133H01M4/587H01M10/054H01M4/1393
CPCH01M4/133H01M4/1393H01M4/587H01M10/054Y02E60/10
Inventor 崔光磊韩鹏献姚建华韩晓琪
Owner QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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