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Negative electrode material applicable to water-based sodium-ion battery

A technology of sodium ion battery and negative electrode material, applied in battery electrodes, non-aqueous electrolyte batteries, circuits, etc., can solve the problems of safety restricting the development of lithium ion batteries, affecting the application of aqueous sodium ion batteries, low flash point of organic solvents, etc. Achieve the effect of high energy ratio, low production cost and low cost

Inactive Publication Date: 2018-04-03
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For lithium-ion batteries, organic solvent-based electrolytes have been practically used in commercialized batteries, but safety issues have always been a difficult problem restricting the development of lithium-ion batteries.
This is mainly because organic solvents have a relatively low flash point and are flammable, leading to safety issues such as explosion or burning of the battery under extreme conditions such as overcharge and overdischarge.
[0004] The negative electrode materials provided by the existing patents for aqueous sodium-ion batteries have poor cycle performance, and are often affected by the hydrogen evolution potential, resulting in low capacity.
This greatly affects the application of aqueous sodium-ion batteries in actual working conditions.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] In this example, the negative electrode material is based on NaTi 2 (PO 4 ) 3 : bismuth sulfide: acetylene black: PVDF binder = 75:5:10:10 weight ratio mixed slurry, evenly coated on the nickel mesh current collector, dried and pressed into a 0.4mm thick electrode sheet. The positive electrode composition is according to λ-MnO 2 : Acetylene black: PVDF binder = 80:10:10 weight ratio mixed slurry, evenly coated on the nickel mesh current collector, dried and pressed into a 0.4mm thick electrode sheet. Using analytically pure raw materials, configure 1.0mol / L sodium sulfate electrolyte. The positive and negative electrodes are cut according to the specifications, and the separator of the commercial nickel-metal hydride battery and the electrolyte of the above configuration are used to pair and assemble the battery. The charge-discharge cycle test was carried out with a current intensity of 40mA / g in the working voltage range of 0-1.8V. The initial discharge specific ...

Embodiment 2

[0021] In this example, the negative electrode material is based on NaTi 2 (PO 4 ) 3 : bismuth sulfide: acetylene black: PVDF binder = 78:2:10:10 weight ratio mixed slurry, evenly coated on the nickel mesh current collector, dried and pressed into a 0.4mm thick electrode sheet. The positive electrode composition is according to λ-MnO 2 : Acetylene black: PVDF binder = 80:10:10 weight ratio mixed slurry, evenly coated on the nickel mesh current collector, dried and pressed into a 0.4mm thick electrode sheet. Using analytically pure raw materials, configure 1.0mol / L sodium sulfate electrolyte. The positive and negative electrodes are cut according to the specifications, and the separator of the commercial nickel-metal hydride battery and the electrolyte of the above configuration are used to pair and assemble the battery. The charge-discharge cycle test was carried out with a current intensity of 40mA / g in the working voltage range of 0-1.8V. The initial discharge specific ...

Embodiment 3

[0023] In this example, the negative electrode material is based on NaTi 2 (PO 4 ) 3 : bismuth sulfide: acetylene black: PVDF binder = 72:8:10:10 weight ratio mixed slurry, evenly coated on the nickel mesh current collector, dried and pressed into a 0.4mm thick electrode sheet. The positive electrode composition is according to λ-MnO 2 : Acetylene black: PVDF binder = 80:10:10 weight ratio mixed slurry, evenly coated on the nickel mesh current collector, dried and pressed into a 0.4mm thick electrode sheet. Using analytically pure raw materials, configure 1.0mol / L sodium sulfate electrolyte. The positive and negative electrodes are cut according to the specifications, and the separator of the commercial nickel-metal hydride battery and the electrolyte of the above configuration are used to pair and assemble the battery. The charge-discharge cycle test was carried out with a current intensity of 40mA / g in the working voltage range of 0-1.8V. The initial discharge specific ...

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Abstract

The invention relates to a negative electrode material applicable to a water-based sodium-ion battery, and belongs to the field of batteries. The negative electrode material comprises a sodium ion embedded compound, a hydrogen evolution inhibitor, a binder and a conducting material, wherein the sodium ion embedded compound is a compound of an NASICON structure and is selected from at least one ofLiTi2(PO4)3 and NaTi2(PO4)3, and the weight proportion occupied in the negative electrode is 70% to 80%; the hydrogen evolution inhibitor is selected from at least one of bismuth sulfide and stannic oxide, and the weight proportion occupied in the negative electrode is 2% to 10%. The water-based sodium-ion capacitor battery assembled by using the negative electrode material has the characteristicsof high electrochemical energy, long service life, good cycle performance and the like, high coulombic efficiency still can be maintained when the charging upper limit voltage is close to 2.0 V, andgood electrochemical cycle performance can be maintained.

Description

technical field [0001] The invention relates to a negative electrode material suitable for aqueous sodium ion batteries, belonging to the field of batteries. Background technique [0002] The social economy is developing at a high speed, and the dependence of human beings on energy is also increasing. According to statistics, now 70% of the world's annual total energy consumption comes from fossil energy (oil, coal, natural gas). However, the combustion of fossil fuels will produce a large amount of harmful substances, which will not only pollute the environment, but also seriously threaten the survival and development of human society. Therefore, the primary problem facing human society is to change the unreasonable energy structure, and at the same time vigorously develop clean energy to gradually replace fossil energy. The development of renewable clean energy such as solar energy, wind energy, geothermal energy, and tidal energy has become a focus of attention in vario...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/131H01M4/485H01M4/58H01M4/62H01M10/05
CPCH01M4/131H01M4/485H01M4/5805H01M4/623H01M4/628H01M10/05Y02E60/10
Inventor 张开悦肖伟赵焕刘建国严川伟
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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