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Electrolyte and its preparation method and battery

An electrolyte and electrolyte technology, applied in electrolytes, secondary batteries, organic electrolytes, etc., can solve problems such as inapplicability in deep and low temperature environments, and achieve the effects of reducing charge transfer resistance, reducing resistance, and reducing viscosity

Active Publication Date: 2021-06-08
中国电子新能源(武汉)研究院有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The above methods have improved the low-temperature performance of the battery at -10°C to -30°C, but because they still use solvents with high melting points, they are not suitable for deep low-temperature environments below -40°C

Method used

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  • Electrolyte and its preparation method and battery
  • Electrolyte and its preparation method and battery
  • Electrolyte and its preparation method and battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] An electrolyte solution, its components include ethyl acetate and chloroform, ethyl acetate and chloroform are used as solvents, and the volume ratio of ethyl acetate and chloroform is 1:2.

[0031] The electrolyte composition also includes electrolyte and additives, the electrolyte is NaPF 6 , the additives include potassium salt additives and AgPF 6 , the potassium salt additive is potassium sulfate, the concentration of potassium sulfate is 0.1mol / L, AgPF 6 The concentration is 0.01mol / L.

[0032] The preparation method of above-mentioned electrolytic solution, comprises the following steps:

[0033] S1. Mix ethyl acetate and chloroform with a volume ratio of 1:2 at a temperature of 25° C.;

[0034] S2. Add electrolyte, potassium sulfate and AgPF 6 , and mix evenly to obtain the electrolyte.

Embodiment 2

[0036] An electrolyte whose components include ethyl propionate and chloroform, ethyl acetate and chloroform as solvents, and the volume ratio of ethyl acetate and chloroform is 1:1.5.

[0037] The electrolyte composition also includes electrolyte and additives, the electrolyte is NaPF 6 , the additives include potassium salt additives and AgPF 6 , the potassium salt additive is potassium carbonate, the concentration of potassium carbonate is 0.15mol / L, AgPF 6 The concentration is 0.01mol / L.

[0038] The preparation method of above-mentioned electrolytic solution, comprises the following steps:

[0039] S1. Mix ethyl propionate and chloroform with a volume ratio of 1:1.5 at a temperature of 25°C;

[0040] S2. Add electrolyte, potassium carbonate and AgPF 6 , and mix evenly to obtain the electrolyte.

Embodiment 3

[0042] A kind of electrolytic solution, its component comprises methyl acetate, ethyl acetate and methylene chloride, methyl acetate, ethyl acetate and methylene chloride are as solvent, the volume ratio of methyl acetate, ethyl acetate and methylene chloride is 1:1:3.

[0043] The electrolyte composition also includes electrolyte and additives, the electrolyte is NaPF 6 , the additives include potassium salt additives and AgPF 6 , the potassium salt additive is potassium sulfite, the concentration of potassium sulfite is 0.05mol / L, AgPF 6 The concentration is 0.01mol / L.

[0044] The preparation method of above-mentioned electrolytic solution, comprises the following steps:

[0045] S1. Mix methyl acetate, ethyl acetate and dichloromethane with a volume ratio of 1:1:3 at a temperature of 25°C;

[0046] S2. Add electrolyte, potassium sulfite and AgPF 6 , and mix evenly to obtain the electrolyte.

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Abstract

The present invention provides an electrolytic solution comprising carboxylate and methyl halide. Carboxylate can be combined with the cation of the electrolyte, and halogenated alkanes are small in size and can act as lubricants to reduce ion migration resistance, thereby improving the ionic conductivity of the electrolyte; potassium salt additives can change the internal electrolyte of the electrolyte The solvation status of cations and the film-forming reaction form at the electrode interface enable the formation of a thin and stable SEI film on the surface of the negative electrode, reducing the resistance of ions intercalating into the negative electrode; AgPF 6 The additive can be reduced to form nano-Ag particles on the surface of the negative electrode, which reduces the charge transfer resistance of the SEI film and reduces the ion intercalation / deintercalation resistance; through the joint action of carboxylate, methyl halide, electrolyte and additives, the battery is improved in- The discharge performance and cycle performance below 40°C can still be discharged in a deep low temperature environment of -70°C. The invention also provides a preparation method of the electrolytic solution and a battery containing the electrolytic solution.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to an electrolyte, a preparation method thereof and a battery. Background technique [0002] At present, lithium-ion batteries and sodium-ion battery electrolytes generally use carbonate solvents, and carbonates have a high melting point, and the viscosity increases significantly in low temperature environments, and the conductivity decreases, resulting in battery performance degradation. The development of low-temperature electrolytes is the key to improving the low-temperature performance of secondary batteries. [0003] An electrolyte is disclosed in the prior art, which uses carbonates and amides as solvents and lithium salt additives to improve the low-temperature performance of the battery at -10°C. Another electrolyte, using high boiling point organic solvents, carbonate solvents, aromatic hydrocarbon organic solvents, and carbonate-based additives, improves the discharge,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0566H01M10/0567H01M10/42H01M10/0525H01M10/054
CPCH01M10/0525H01M10/054H01M10/0566H01M10/0567H01M10/4235H01M2300/0025H01M2300/0091Y02E60/10
Inventor 孟庆飞乐琦孔维和
Owner 中国电子新能源(武汉)研究院有限责任公司
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