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Application of tellurium based material serving as negative electrode active material in sodium-based dual-ion cell, sodium-tellurium dual-ion cell and preparation method thereof

A negative electrode active material and dual-ion technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problem of volume expansion and pulverization of tin-sodium alloys, burrs on the surface of tin foil piercing the diaphragm, and potential safety hazards in sodium batteries, etc. problems, to achieve the effect of good stability, adjustable shape, and small volume expansion

Inactive Publication Date: 2018-07-24
SHENZHEN INST OF ADVANCED TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Similar to the problem in lithium-ion batteries, due to the low potential platform of hard carbon materials, it is easy to form metal sodium deposits on the surface of the negative electrode, resulting in the same safety hazards in sodium batteries.
On the other hand, if tin foil is used as the negative electrode, there will be volume expansion and pulverization caused by tin-sodium alloying, and the burrs on the surface of the tin foil will pierce the separator, causing safety problems

Method used

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  • Application of tellurium based material serving as negative electrode active material in sodium-based dual-ion cell, sodium-tellurium dual-ion cell and preparation method thereof
  • Application of tellurium based material serving as negative electrode active material in sodium-based dual-ion cell, sodium-tellurium dual-ion cell and preparation method thereof
  • Application of tellurium based material serving as negative electrode active material in sodium-based dual-ion cell, sodium-tellurium dual-ion cell and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0155] As a preferred embodiment, the preparation method of sodium tellurium double ion battery comprises the following steps:

[0156] a) Preparing the negative electrode: mixing the active material of the negative electrode material, the conductive agent, the binder and the solvent to form a slurry; then uniformly coating the slurry on the surface of the negative electrode current collector, cutting it into pieces after drying, and obtaining a negative electrode of a required size;

[0157] b) Prepare the electrolyte: dissolve the sodium salt electrolyte in the corresponding non-aqueous solvent, and mix thoroughly to obtain the electrolyte;

[0158] c) Prepare the diaphragm: cut the diaphragm into the required size and dry it;

[0159] d) Preparing the positive electrode: mixing the positive electrode active material, the conductive agent, the binder and the solvent to form a slurry; then uniformly coating the slurry on the surface of the positive electrode current collector...

Embodiment 1

[0167] A sodium-tellurium double-ion battery includes a negative electrode, a diaphragm, an electrolyte and a positive electrode.

[0168] Preparation of negative electrode: Add 0.4g tellurium nanowires, 0.05g conductive carbon black, and 0.05g polyvinylidene fluoride into 2mL N-methylpyrrolidone solvent, grind thoroughly to obtain a uniform slurry; then evenly coat the slurry on copper foil The surface, as the negative electrode of the battery, was vacuum-dried at 80°C for 12h. Cut the electrode sheet obtained by drying into a disc with a diameter of 12 mm, compact it with a hydraulic press (10 MPa, 10 s), and place it in a glove box as a battery negative electrode for backup.

[0169] Preparation of the separator: the glass fiber paper was cut into discs with a diameter of 16 mm, dried and placed in a glove box as a separator for later use.

[0170] Preparation of electrolyte: Weigh 2g of sodium hexafluorophosphate in a glove box and add to 9mL ethylene carbonate: dimethyl ...

Embodiment 2-12

[0174] The preparation process of the sodium-tellurium double-ion battery of embodiment 2-12 and embodiment 1 is except that the active material used when preparing the negative electrode is different, and all other steps and materials used are the same, while the sodium-tellurium double-ion battery of embodiment 2-12 The energy storage performance of the ion battery was tested and compared with the performance of Example 1.

[0175] The battery test includes energy density, specific capacity and coulombic efficiency. The specific test methods are as follows:

[0176]Cycle charge and discharge: cycle charge and discharge are carried out on CT2001C-001 blue electric battery cycle test system, and the standard capacity of the electrode is tested by charging and discharging at a rate of 100mA / g, the specific capacity of the material = current * time / sample mass, the energy density of the material = specific capacity of the material * platform voltage of the battery, coulombic e...

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Abstract

The invention discloses application of a tellurium based material serving as a negative electrode active material in a sodium-based dual-ion cell, the sodium-tellurium dual-ion cell and a preparationmethod thereof and relates to the field of electrochemical energy storage devices. The invention further discloses application of tellurium, a tellurium compound or a tellurium composite material serving as the negative electrode active material in the sodium-based dual-ion cell. The sodium-tellurium dual-ion cell comprises a negative electrode, a positive electrode, a diaphragm and electrolyte; the negative electrode active material comprises tellurium, the tellurium compound or the tellurium composite material; the positive electrode active material comprises a material capable of being reversibly embedded and dis-embedded into negative ions in the electrolyte; the electrolyte comprises a sodium salt and a non-aqueous solvent. The safety problems existing in the conventional sodium-ion battery taking a carbon material as the negative electrode material that the potential is low, sodium is easily separated out and a tinfoil serving as the negative electrode is simple in volume expansion and is easily powdered are solved. According to the sodium-tellurium dual-ion cell disclosed by the invention, the sodium ion and the tellurium negative electrode can carry out an alloying reaction, the reaction potential is high, and the sodium-tellurium dual-ion cell has the characteristics of being high in safety, high in specific energy density and stable in cycle.

Description

technical field [0001] The invention relates to the technical field of electrochemical energy storage devices, in particular to the application of a tellurium-based material as a negative electrode active material in a sodium-based dual-ion battery, a sodium-tellurium dual-ion battery and a preparation method thereof. Background technique [0002] At present, there are few studies on batteries based on Na-ion systems, and studies on Na-ion dual-ion batteries are even rarer. [0003] In October 2016, researcher Tang Yongbing of the Shenzhen Institutes of Advanced Technology of the Chinese Academy of Sciences and his team published the article "A new type of high energy density tin-graphite dual ion battery based on sodium ion electrolyte" (Advanced Energy Materials, Adv. Energy Mater .2017, 1601963). Its research team uses tin foil as the negative electrode sheet of a new high-efficiency dual-ion battery. Due to the reduction of traditional negative electrode active material...

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M10/054
CPCH01M4/58H01M4/581H01M10/054Y02E60/10
Inventor 唐永炳雷新张苗
Owner SHENZHEN INST OF ADVANCED TECH
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