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Power type electrolyte and sodium ion battery

An electrolyte and power-based technology, which is applied in secondary batteries, hybrid capacitor electrolytes, secondary battery repair/maintenance, etc., can solve the problems that are not conducive to the desolvation of sodium ions, limit the work of sodium-ion batteries, and have high melting points of solvents. Achieve the effects of fast intercalation, excellent capacity retention, and low solvation energy

Active Publication Date: 2022-07-08
南通全诺新能源材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The solvent in this type of electrolyte has a high melting point, high viscosity and strong interaction with sodium ions, which limits the diffusion of sodium ions in the solution to a certain extent, and is also not conducive to the formation of sodium ions at the electrode-electrolyte interface. Desolvation
In addition, when charging and discharging under high-rate conditions, the conductivity of these electrolytes is not enough to support such a large current density, and the large charge transfer resistance and SEI membrane resistance limit the transmission of sodium ions, such as ethylene carbonate and Solvents with high viscosity, such as propylene carbonate, greatly limit the work of sodium-ion batteries under high-rate conditions.

Method used

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preparation example Construction

[0045] Wherein the preparation method of bentonite modifier is:

[0046] S11: Add 10-20 parts of bentonite to 25-35 parts of 5% hydrochloric acid solution by mass, then add 1-5 parts of silane coupling agent KH570, 1-3 parts of sodium alginate and 1-2 parts of lignosulfonic acid Sodium, stir and mix well to obtain bentonite liquid;

[0047] S12: placing the carbon nanotubes in a proton irradiation box for irradiation treatment, the irradiation power is 350-450W, the irradiation time is 10-20min, and the irradiation is completed to obtain irradiation-type carbon nanotubes;

[0048] S13: fully stir and disperse the irradiated carbon nanotubes and the bentonite liquid in a weight ratio of 1:5, then wash with water and dry;

[0049] S14: The product of S13 is calcined at 155-175° C. for 10-20 minutes, and then brought to room temperature at a rate of 1-3° C. / min.

[0050] The electrolyte salt of this embodiment is a mixed electrolyte of a sodium salt with a larger anion and othe...

Embodiment 1

[0069] The invention of this embodiment provides a power type electrolyte, an electrolyte salt, an organic solvent and a composite additive, wherein the electrolyte salt includes at least one weakly-coordinating anion sodium salt with a larger ionic radius and a bentonite modifier by weight It is compounded in a ratio of 3:1, and the compound additives include fluorocarbonate, sultone and modified alumina;

[0070] Wherein the preparation method of bentonite modifier is:

[0071] S11: add 10 parts of bentonite to 25 parts of hydrochloric acid solution with a mass fraction of 5%, then add 1 part of silane coupling agent KH570, 1 part of sodium alginate and 1 part of sodium lignosulfonate, stir and mix sufficiently to obtain bentonite liquid ;

[0072] S12: placing the carbon nanotubes in a proton irradiation box for irradiation treatment, the irradiation power is 350W, the irradiation time is 10min, and the irradiation is completed to obtain irradiation-type carbon nanotubes; ...

Embodiment 2

[0093] The invention of this embodiment provides a power type electrolyte, an electrolyte salt, an organic solvent and a composite additive, wherein the electrolyte salt includes at least one weakly-coordinating anion sodium salt with a larger ionic radius and a bentonite modifier by weight It is compounded in a ratio of 3:1, and the compound additives include fluorocarbonate, sultone and modified alumina;

[0094] Wherein the preparation method of bentonite modifier is:

[0095] S11: add 20 parts of bentonite to 35 parts of hydrochloric acid solution with a mass fraction of 5%, then add 5 parts of silane coupling agent KH570, 3 parts of sodium alginate and 2 parts of sodium lignosulfonate, stir and mix sufficiently to obtain bentonite liquid ;

[0096] S12: placing the carbon nanotubes in a proton irradiation box for irradiation treatment, the irradiation power is 450W, the irradiation time is 20min, and the irradiation is completed to obtain irradiated carbon nanotubes;

...

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Abstract

The invention discloses a power type electrolyte, an electrolyte salt, an organic solvent and a composite additive, the electrolyte salt is formed by compounding at least one weak coordination anion sodium salt with a large ion radius and a bentonite modifier according to a weight ratio of 3: 1, and the composite additive comprises fluoro-carbonate, sultone and modified alumina. Compared with the traditional electrolyte, the power type electrolyte disclosed by the invention shows relatively high ionic conductivity and relatively low sodium ion desolvation energy, and ensures that the sodium ion battery has excellent high-power performance. The sodium ion battery using the electrolyte shows an excellent capacity retention ratio under a high-rate charge-discharge working condition, and the cycle life of the battery during high-rate charge-discharge is prolonged.

Description

technical field [0001] The invention relates to the technical field of sodium ion batteries, in particular to a power type electrolyte and a sodium ion battery. Background technique [0002] Lithium-ion batteries are widely used in portable electronic products, electric vehicles, energy storage and other fields due to their excellent electrochemical properties. However, due to the uneven distribution of lithium resources and the imbalance of supply and demand, the price of lithium sources represented by lithium carbonate and lithium hydroxide is The continuous rise puts the cost of lithium-ion batteries under huge upward pressure, which is not conducive to the achievement of the goal of energy saving and carbon reduction. The working principle of sodium-ion batteries is highly similar to that of lithium-ion batteries and can be used as an alternative technology to lithium-ion batteries. In addition, sodium-ion batteries have broad application prospects in the fields of larg...

Claims

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Application Information

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IPC IPC(8): H01M10/0569H01M10/0568H01M10/0567H01M10/054H01M10/42H01G11/60H01G11/62H01G11/64B82Y30/00B82Y40/00
CPCH01M10/0569H01M10/0568H01M10/0567H01M10/054H01M10/4235H01G11/60H01G11/62H01G11/64B82Y30/00B82Y40/00Y02E60/10
Inventor 吴迪建
Owner 南通全诺新能源材料科技有限公司
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