Organic gel electrolyte, application, sodium-based double-ion organic solid-state battery and preparation method thereof

An organic gel and solid-state battery technology, applied in the direction of organic electrolyte, electrolyte immobilization/gelation, non-aqueous electrolyte, etc., can solve the problems of SEI film instability, high temperature of ceramic electrolyte, explosion, etc., to improve the cycle Stability, good ion conduction performance, and the effect of broadening the application field

Inactive Publication Date: 2018-06-19
SHENZHEN INST OF ADVANCED TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, ceramic electrolytes still face safety issues caused by high operating temperatures.
The disadvantages of existing all-solid-state sodium-ion batteries are: (1) materials are mostly synthesized by traditional sol-gel method, melting method, mortar sintering and other methods, and the obtained samples are impure and the components are not easy to control; (2) It is difficult to find matching electrodes for the synthesized fast ion conductors, and they generally belong to pure crystals with unstable structures and unstable chemical properties in air, making it difficult to achieve large-scale applications; (3) at room temperature, The conductivity of the all-solid electrolyte is small, and it has good conductivity at high temperature. However, there are safety problems at high temperature.
[0004] CN106532114A proposed a sodium ion solid electrolyte composite material based on NASICON structure and its preparation method and application. In this invention patent, a kind of solid electrolyte composite material based on NASICON structure was synthesized by traditional sol-gel method, and obtained Composite solid electrolyte has an ionic conductivity of 3.4×10 at room temperature -3 S/cm, the starting point of the patent is the preparation of fast ion conductors, more consideration is the ion-conducting performance of solid electrolytes, but the disadvantage is that the conductivity is poor
However, when tin foi

Method used

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  • Organic gel electrolyte, application, sodium-based double-ion organic solid-state battery and preparation method thereof
  • Organic gel electrolyte, application, sodium-based double-ion organic solid-state battery and preparation method thereof
  • Organic gel electrolyte, application, sodium-based double-ion organic solid-state battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0078] As a preferred embodiment, the ionic liquid includes 1-ethyl-3-methylimidazole-hexafluorophosphate, 1-ethyl-3-methylimidazole-tetrafluoroborate, 1-ethyl-3 -Methylimidazole-bistrifluoromethylsulfonimide salt, 1-propyl-3-methylimidazole-hexafluorophosphate, 1-propyl-3-methylimidazole-tetrafluoroborate, 1 -Propyl-3-methylimidazole-bistrifluoromethylsulfonimide salt, 1-butyl-1-methylimidazole-hexafluorophosphate, 1-butyl-1-methylimidazole-tetrafluoro Borate, 1-butyl-1-methylimidazole-bistrifluoromethylsulfonimide salt, N-butyl-N-methylpyrrolidine-bistrifluoromethylsulfonimide salt, 1 -Butyl-1-methylpyrrolidine-bistrifluoromethylsulfonimide salt, N-methyl-N-propylpyrrolidine-bistrifluoromethylsulfonimide salt, N-methyl,propane One or at least two of N-methylbutylpiperidine-bistrifluoromethylsulfonimide salts or N-methylbutylpiperidine-bistrifluoromethylsulfonimide salts.

[0079] [Organic polymer]

[0080] Typical but non-limiting mass percentages of organic polymers are,...

Embodiment 1

[0175] A sodium-based dual-ion organic solid-state battery includes a negative electrode, a separator, an organic gel electrolyte, and a positive electrode.

[0176] Prepare the negative electrode: use the tin foil integrated with the current collector and the negative electrode, and ultrasonically clean the tin foil with deionized water, acetone, and ethanol for 3-5 minutes, and cut it into a disc with a diameter of 12mm after drying, as the negative electrode for later use ;

[0177] Preparation of the separator: the glass fiber film was cut into discs with a diameter of 16 mm and used as a separator for later use.

[0178] Preparation of organogel electrolyte: Weigh 3g of sodium hexafluorophosphate and add it to 5mL of a mixed solvent of ethylene carbonate, dimethyl carbonate and ethyl methyl carbonate, stir until sodium hexafluorophosphate is completely dissolved, then add 5% The fluoroethylene carbonate is used as an additive, and after being fully stirred evenly, an org...

Embodiment 2-20

[0182] The sodium-based dual-ion organic solid-state batteries of Examples 2-20 all adopt the same tin foil negative electrode material, glass fiber separator, the same electrolyte salt, the same concentration of electrolyte and graphite positive electrode material as in Example 1, the difference is the addition of organic polymer.

[0183] The electrochemical properties of Example 1 and Examples 2-20 were tested, including the number of cycles, capacity retention and Coulombic efficiency. The test method is as follows:

[0184] 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 * plateau voltage of the battery, the charging and discharging conditions depend on ...

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Abstract

The invention discloses organic gel electrolyte, application, a sodium-based double-ion organic solid-state battery and a preparation method thereof and relates to the field of electrochemical energystorage devices. The organic gel electrolyte is prepared from electrolyte sodium salt, a non-aqueous solvent and an organic polymer. The sodium-based double-ion organic solid-state battery comprises anegative electrode, a positive electrode, a diaphragm and the organic gel electrolyte; the negative electrode can be sodium ion alloyed metal, a metal alloy or a metal compound; the positive electrode comprises a positive electrode current collector and a positive electrode material; an active substance of the positive electrode material is a laminar material which can be used for reversibly embedding and disembedding sodium salt anions. According to the organic gel electrolyte disclosed by the invention, the problems that organic electrolyte is easy to volatilize, combust and explode, a sodium ion solid-state battery cannot consider ion conducting performance and electrical conductivity at the same time, and the safety performance is not good at high temperature are alleviated. The organic gel electrolyte disclosed by the invention has very good ion conducting performance and electrical conductivity and an electrode piece powdering problem caused by the fact that volume expansion iscaused by alloying can be alleviated; the battery has good circulating stability and safety performance.

Description

technical field [0001] The invention relates to the technical field of electrochemical energy storage devices, in particular to an organic gel electrolyte, its application, a sodium-based double-ion organic solid-state battery and a preparation method thereof. Background technique [0002] Lithium-ion batteries have the advantages of high energy density, high energy efficiency, long cycle life, no memory effect, fast discharge, etc., so they have huge markets in consumer electronics and electric vehicles, power grid peak regulation, energy storage power supplies, aerospace and other fields need. Although the organic electrolyte used in traditional lithium-ion batteries has the advantages of high ionic conductivity, easy control of the electrode / electrolyte interface, and convenient processing, etc., the organic electrolyte is volatile, flammable, and explosive, making batteries especially There are great safety hazards when the capacity is large, and the limited electrochem...

Claims

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Application Information

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IPC IPC(8): H01M10/0565H01M10/0567H01M10/0568H01M10/054
CPCH01M10/054H01M10/0565H01M10/0567H01M10/0568H01M2300/0025H01M2300/0085Y02E60/10
Inventor 唐永炳于奥张苗
Owner SHENZHEN INST OF ADVANCED TECH
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