Non-combustible high-safety sodium ion battery

A sodium-ion battery, high-safety technology, used in secondary batteries, climate sustainability, non-aqueous electrolyte batteries, etc., can solve problems such as hidden dangers, flammability, hinder practical application, etc. Cost, low cost effect

Pending Publication Date: 2022-03-01
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These organic solvents are flammable, which poses a hidden danger for the safe use of sodium-ion batteries
Moreover, due to the solubility of these organic solvents, some cheap inorganic sodium salts (such as sodium nitrate or sodium sulfate) cannot be dissolved in these ester electrolytes, which further hinders their practical application and is not conducive to the large-scale production of sodium-ion batteries. and sustainable development
[0004] In response to these problems, although many researchers have conducted research, they still cannot solve the problems of flammability and inorganic salt solubility.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Trimethyl phosphate (TMP), fluoroethylene carbonate (FEC), and ethyl methyl carbonate (EMC) were mixed according to a volume ratio of 1:1:2, and then sodium nitrate was added to form a 1mol / L solution. Put the prepared electrolyte on the flame of the alcohol lamp for 10 seconds, and the electrolyte is not ignited. Take Na 3 V 2 (PO 4 ) 3 as a positive electrode active material. The preparation of the positive electrode sheet is as follows: according to the active material (Na 3 V 2 (PO 4 ) 3 ): conductive agent (super P): binder (polyvinylidene fluoride PVDF) = 80:10:10 mixed slurry, coated on the surface of carbon-coated aluminum foil to form a positive electrode sheet. Secondly, metal sodium (Na) was used as the negative electrode material, and Celgard 2500 film was used as the separator to assemble a 2032 button battery. At room temperature of 25°C and a current density of 1C, the first-cycle capacity is 115mAh / g. After 475 cycles, the capacity retention rat...

Embodiment 2

[0024] Mix trimethyl phosphate (TMP), fluoroethylene carbonate (FEC), and ethyl methyl carbonate (EMC) in a volume ratio of 1:1:2, and then add 30% volume ratio of acrylic acid to the homogeneous solution Butyl ester monomer, then add sodium nitrate to make a 1mol / L solution. Azobisisobutyronitrile (AIBN) was then dissolved in the solution as a thermal initiator. The resulting solution was injected into glass molds with silicone spacers. Finally, the electrolyte was heated at 70 °C for 12 h to obtain a quasi-solid state highly concentrated electrolyte. Put the prepared quasi-solid electrolyte on the flame of the alcohol lamp for 10 seconds, and the electrolyte is not ignited. Take Na 3 V 2 (PO 4 ) 3 as a positive electrode active material. The preparation of the positive electrode sheet is as follows: according to the active material (Na 3 V 2 (PO 4 ) 3 ): conductive agent (super P): binder (polyvinylidene fluoride PVDF) = 80:10:10 mixed slurry, coated on the surfac...

Embodiment 3

[0026]Mix diethyl carbonate (DEC) and triethyl phosphate (TEP) at a volume ratio of 3:1, and then add sodium sulfate as a solute to prepare an electrolyte solution with a concentration of 1 mol / L. Put the prepared electrolyte on the flame of the alcohol lamp for 10 seconds, and the electrolyte is not ignited. Take Na 3 V 2 (PO 4 ) 3 as a positive electrode active material. The preparation of the positive electrode sheet is as follows: according to the active material (Na 3 V 2 (PO 4 ) 3 ): conductive agent (super P): binder (polyvinylidene fluoride PVDF) = 80:10:10 mixed slurry, coated on the surface of carbon-coated aluminum foil to form a positive electrode sheet. Secondly, hard carbon is used as the negative electrode active material. Hard carbon: conductive agent (super P): binder (sodium carboxymethyl cellulose CMC) = 80:10:10 mixed slurry, coated on the surface of copper foil to form a negative electrode sheet. A 2032 coin cell was assembled using Celgard 2500 ...

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Abstract

The invention belongs to the technical field of electrochemistry, and particularly relates to a non-combustible high-safety sodium ion battery. The lithium ion battery comprises a positive electrode, a negative electrode and an electrolyte, wherein the electrolyte comprises a sodium salt, an ester solvent and a flame retardant; wherein the sodium salt is selected from one or more of NaNO3, Na2SO4, Na3PO4, NaI, NaPF6, NaTFSI, NaFSI or NaTFMS, and the flame retardant is selected from one or more of trimethyl phosphate, triethyl phosphate, tributyl phosphate, dimethyl methylphosphate, diethyl ethylphosphate, diphenyl isopropylphenyl phosphate or hexamethylphosphoramide. Electrolyte used by a traditional sodium ion battery is combustible, and the safety of the battery is damaged. The sodium-ion battery electrolyte provided by the invention is non-combustible, so that the sodium-ion battery electrolyte shows a safer characteristic compared with a traditional sodium-ion battery, and has a certain application prospect in the aspects of large energy storage and power batteries.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to a nonflammable high-safety sodium ion battery. Background technique [0002] In recent years, sodium-ion batteries have developed rapidly and have been widely used in various industries. Especially in new energy storage and mobile electronic devices, sodium-ion batteries have become an indispensable part. However, with the popularization of the use of sodium-ion batteries, people have also put forward higher and higher requirements for sodium-ion batteries. How to improve the safety of sodium-ion batteries has become an unavoidable problem. Electrolyte, as an important part of sodium-ion batteries, has first become the focus of attention. [0003] Electrolyte solvents commonly used in sodium-ion batteries are organic solvents such as EC (ethylene carbonate), DMC (ethyl methyl carbonate), and DEC (diethyl carbonate). These organic solvents are flammable, which po...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/058H01M10/054H01M10/42A62C3/16
CPCH01M10/0567H01M10/058H01M10/054H01M10/4235A62C3/16Y02E60/10Y02P70/50
Inventor 王永刚周康
Owner FUDAN UNIV
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