A kind of polymer electrolyte for lithium ion battery and preparation method thereof

Abstract

The invention provides a polymer electrolyte for a lithium ion battery and a preparation method, relating to the field of the electrolyte for the lithium ion battery. Specifically, the invention relates to the polymer electrolyte which is prepared by cross-linking and curing a silane terminal blocked polyether oligomer as a prepolymer, a conductive lithium salt as a lithium source, an organic solvent as a plasticizer and tin salt as a catalyst and application of the polymer electrolyte in the lithium ion polymer battery. The polymer electrolyte has the characteristics of polypropylene oxide (PEO) and silicone rubber and has excellent mechanical property, high / low temperature resistance stability, electrochemical stability, window stability and high ionic conductivity; the lithium ion battery still can work at 80 DEG C; the preparation condition and the process are simple and easy to control; the polymer electrolyte has excellent flexibility; the growth of cathode lithium dendrites can be effectively restrained; the interface stability of the lithium ion polymer battery is promoted; the polymer electrolyte is suitable for the flexible lithium ion polymer battery.

Description

technical field

[0001] The invention relates to the field of electrolytes for lithium ion batteries, in particular to a novel polymer electrolyte for lithium ion batteries. Background technique

[0002] Due to the advantages of high energy density, high stability and fast charging, lithium-ion batteries account for an increasing proportion of modern energy storage devices, and are widely used in electric vehicles and mobile electronic devices. The biggest advantage is the realization of the zero-carbon emission plan, which promotes the rapid development of the modern electric vehicle industry, which in turn requires a large number of lithium-ion batteries with fast charging and discharging performance, good safety and stability. The structure and performance of lithium-ion battery electrolytes play a crucial role in improving the rate performance and thermal stability of lithium-ion batteries. Traditional lithium-ion battery separators generally use polyolefin polymers (pol...

Examples

Embodiment 1

[0024] 2.48g LiPF 6 Dissolve in 5ml of ethylene carbonate (EC) and propylene carbonate (PC) (V:V=1:1), stir at room temperature to dissolve completely. Add 3g of polypropylene oxide prepolymer of silane-terminated polyether to the electrolyte solution of lithium hexafluorophosphate, ethylene carbonate and propylene carbonate and stir evenly, and finally add 0.1g of dioctyltin dropwise instead of dibutyltin and stir evenly. On the polytetrafluoroethylene mold, with the cellulose film as the supporting framework, the uniformly stirred polymer electrolyte was scraped and coated on both sides of the cellulose film, and heated at 60°C for 6 hours in a drying oven to solidify to form a film.

Embodiment 2

[0026] 1.89g LiC(CF 3 SO 2 ) 3 Dissolve in 4ml of ethylene carbonate (EC) and tetraethylene glycol dimethyl ether (TEGDME) (V:V=1:1), stir at room temperature to dissolve completely. Add 3g polypropylene oxide prepolymer of silane-terminated polyether to the electrolyte solution of lithium hexafluorophosphate, ethylene carbonate and tetraethylene glycol dimethyl ether, stir evenly (indicate the viscosity number average molecular weight), and finally add 0.07g di Alkyltin mercaptide is stirred evenly. On the polytetrafluoroethylene mold, with non-woven fabric as the supporting framework, the uniformly stirred polymer electrolyte was scraped and coated on both sides of the cellulose membrane, and heated at 80°C for 4 hours in a drying oven to solidify to form a membrane.

Embodiment 3

[0028] 1.22g LiClO 4 Dissolve in 3ml of triethylene glycol dimethyl ether and tetraethylene glycol dimethyl ether (TEGDME) (V:V=1:1), stir at room temperature to dissolve completely. To the electrolyte solution of lithium perchlorate, triethylene glycol dimethyl ether and tetraethylene glycol dimethyl ether, add 2 g of polypropylene oxide prepolymer of silane-terminated polyether and stir evenly, and finally add 0.04 g of platinum water dropwise The catalyst is evenly stirred. On the polytetrafluoroethylene mold, with the cellulose film as the supporting framework, the uniformly stirred polymer electrolyte was scraped and coated on both sides of the cellulose film, and heated at 70°C for 4 hours in a drying oven to solidify to form a film.

technical field

[0001] The invention relates to the field of electrolytes for lithium ion batteries, in particular to a novel polymer electrolyte for lithium ion batteries. Background technique

[0002] Due to the advantages of high energy density, high stability and fast charging, lithium-ion batteries account for an increasing proportion of modern energy storage devices, and are widely used in electric vehicles and mobile electronic devices. The biggest advantage is the realization of the zero-carbon emission plan, which promotes the rapid development of the modern electric vehicle industry, which in turn requires a large number of lithium-ion batteries with fast charging and discharging performance, good safety and stability. The structure and performance of lithium-ion battery electrolytes play a crucial role in improving the rate performance and thermal stability of lithium-ion batteries. Traditional lithium-ion battery separators generally use polyolefin polymers (pol...

Examples

Embodiment 1

[0024] 2.48g LiPF 6 Dissolve in 5ml of ethylene carbonate (EC) and propylene carbonate (PC) (V:V=1:1), stir at room temperature to dissolve completely. Add 3g of polypropylene oxide prepolymer of silane-terminated polyether to the electrolyte solution of lithium hexafluorophosphate, ethylene carbonate and propylene carbonate and stir evenly, and finally add 0.1g of dioctyltin dropwise instead of dibutyltin and stir evenly. On the polytetrafluoroethylene mold, with the cellulose film as the supporting framework, the uniformly stirred polymer electrolyte was scraped and coated on both sides of the cellulose film, and heated at 60°C for 6 hours in a drying oven to solidify to form a film.

Embodiment 2

[0026] 1.89g LiC(CF 3 SO 2 ) 3 Dissolve in 4ml of ethylene carbonate (EC) and tetraethylene glycol dimethyl ether (TEGDME) (V:V=1:1), stir at room temperature to dissolve completely. Add 3g polypropylene oxide prepolymer of silane-terminated polyether to the electrolyte solution of lithium hexafluorophosphate, ethylene carbonate and tetraethylene glycol dimethyl ether, stir evenly (indicate the viscosity number average molecular weight), and finally add 0.07g di Alkyltin mercaptide is stirred evenly. On the polytetrafluoroethylene mold, with non-woven fabric as the supporting framework, the uniformly stirred polymer electrolyte was scraped and coated on both sides of the cellulose membrane, and heated at 80°C for 4 hours in a drying oven to solidify to form a membrane.

Embodiment 3

[0028] 1.22g LiClO 4 Dissolve in 3ml of triethylene glycol dimethyl ether and tetraethylene glycol dimethyl ether (TEGDME) (V:V=1:1), stir at room temperature to dissolve completely. To the electrolyte solution of lithium perchlorate, triethylene glycol dimethyl ether and tetraethylene glycol dimethyl ether, add 2 g of polypropylene oxide prepolymer of silane-terminated polyether and stir evenly, and finally add 0.04 g of platinum water dropwise The catalyst is evenly stirred. On the polytetrafluoroethylene mold, with the cellulose film as the supporting framework, the uniformly stirred polymer electrolyte was scraped and coated on both sides of the cellulose film, and heated at 70°C for 4 hours in a drying oven to solidify to form a film.

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