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Wide-temperature type sodium ion battery electrolyte

A sodium-ion battery, electrolyte technology, applied in secondary batteries, circuits, electrical components, etc., can solve problems such as fire, decrease in conductivity, increase in charge transfer resistance, etc., achieve low viscosity, high boiling point and flash point, The effect of improving the capacity retention rate

Pending Publication Date: 2022-04-26
HENAN FAENLAITE NEW ENERGY SCI & TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Similar to the lithium-ion battery electrolyte, the sodium-ion battery electrolyte is prone to crystallization at low temperatures, the electrical conductivity is greatly reduced, and the charge transfer resistance is increased, which greatly reduces the cycle performance of the battery and increases concentration polarization. Causes dendrites to pierce the separator, causing short circuit or fire problems

Method used

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  • Wide-temperature type sodium ion battery electrolyte
  • Wide-temperature type sodium ion battery electrolyte
  • Wide-temperature type sodium ion battery electrolyte

Examples

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Embodiment 1

[0024] Embodiment 1: a kind of wide temperature type sodium-ion battery electrolyte, comprises organic solvent, sodium salt and functional additive; It is characterized in that: comprise three (trimethylsilyl) phosphate, N, N- One or more of dimethyltrifluoroacetamide, fluoroethylene carbonate, vinyl sulfate, and sodium difluorophosphate;

[0025] Described three (trimethylsilyl) phosphoric acid esters are high-temperature cycle performance additives; Described N, N-dimethyltrifluoroacetamide is low-temperature cycle performance additives;

[0026] Described organic solvent comprises one or more in ethylene carbonate, ethyl methyl carbonate, diethyl carbonate and propylene carbonate;

[0027] The sodium salt is one or both of sodium hexafluorophosphate or sodium perchlorate;

[0028] According to parts by weight, the functional additive includes 0.5-1.5 parts of fluoroethylene carbonate, 1-2 parts of vinyl sulfate and 0.5-2 parts of sodium difluorophosphate;

[0029] Accordi...

Embodiment 2

[0034] Example 2: An electrolyte solution for a wide-temperature sodium-ion battery; prepared by the following method, at room temperature, in a glove box, mixing organic solvents in proportion, dissolving sodium salt in the mixed organic solvent, and then adding functional additives ;

[0035] Wherein, the functional additive includes 0.5-1.5 parts of fluoroethylene carbonate, 1-2 parts of vinyl sulfate, 0.5-2 parts of sodium difluorophosphate; the organic solvent includes 20-30 parts of carbonic acid vinyl ester, 35-45 parts of ethyl methyl carbonate, 15-25 parts of diethyl carbonate and 10-20 parts of propylene carbonate; the sodium salt is 10-20 parts of sodium hexafluorophosphate or perchloric acid sodium.

Embodiment 3

[0036] Example 3: An electrolyte solution for a wide-temperature sodium-ion battery; prepared as follows, at room temperature, in a glove box, mixing organic solvents in proportion, dissolving sodium salt in the mixed organic solvent, and then adding functional additives ;Activate the battery by charging and discharging with 1 / 10C 2.5V to 3.6V at a constant temperature of 25°C at room temperature;

[0037] Wherein said functional additive includes 0.5 parts of fluoroethylene carbonate, 1 part of vinyl sulfate and 0.5 part of sodium difluorophosphate; said organic solvent includes 20 parts of ethylene carbonate, 35 parts of methyl ethyl carbonate Esters, 15 parts of diethyl carbonate and 10 parts of propylene carbonate; the sodium salt is 10 parts of sodium hexafluorophosphate.

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Abstract

The invention discloses a wide-temperature type sodium-ion battery electrolyte which comprises an organic solvent, sodium salt and a functional additive, the functional additive comprises one or more of tris (trimethylsilyl) phosphate, N, N-dimethyl trifluoroacetamide, fluoroethylene carbonate, ethylene sulfate and sodium difluorophosphate. The invention has the following beneficial effects: tris (trimethylsilyl) phosphate is used in the functional additive, can be adsorbed on the surface of a material prior to a solvent at a high temperature, and is catalytically decomposed on the surface of excessive ions at a high potential to generate an organic decomposition product with a relatively high concentration; therefore, the continuous oxygenolysis of the electrolyte and the dissolution of transition metal ions caused by the erosion of HF in the electrolyte to the material are prevented, and the interface impedance is reduced, so that the high-temperature cycle performance of the battery is improved. N, N-dimethyl trifluoroacetamide is used in the functional additive, so that better oxidation stability protection can be carried out on the positive electrode material at a low temperature, and the capacity retention rate can be improved at the low temperature.

Description

technical field [0001] The invention relates to the technical field of electrolytes for sodium-ion batteries, in particular to electrolytes for wide-temperature sodium-ion batteries. Background technique [0002] Sodium-ion batteries were proposed at the same time as lithium-ion batteries in the 1970s, but the excellent performance of lithium-ion batteries made scientists give up research on sodium-ion batteries, and almost all invested in the research and development of lithium-ion batteries. Lithium-ion batteries Great progress has also been made in the past 50 years. Especially in 1990, Sony realized the commercialization of lithium-ion battery technology, which led to the rapid development of lithium-ion battery technology, but the research on sodium-ion batteries was relatively stagnant during the same period. [0003] However, since 2010, people have gradually realized that lithium resources are scarce and unevenly distributed. Especially in the context of the global r...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0569H01M10/0568H01M10/054
CPCH01M10/0567H01M10/0569H01M10/0568H01M10/054
Inventor 邵俊华孔东波张利娟宋东亮王亚洲李海杰韩飞郭飞王郝为闫国锋龚国斌
Owner HENAN FAENLAITE NEW ENERGY SCI & TECH CO LTD
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