Polycarbonate all-solid-state polymer electrolyte, all-solid-state secondary lithium battery made of same and preparation and application thereof

An all-solid polymer, carbonate technology, applied in non-aqueous electrolyte batteries, secondary batteries, lithium batteries, etc., can solve the problem of difficult to obtain independently supported polymer films, linear and grafted polymers with poor mechanical properties , small electrical conductivity of the reticulated polymer, etc., to achieve excellent oxygen and water barrier, good mechanical properties, and easy preparation.

Active Publication Date: 2016-05-18
QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Polyethylene oxide (PEO) / lithium salt electrolytes have been used in all-solid-state lithium polymer batteries, but there are still some problems to be solved from the practical point of view: linear and grafted polymers have poor mechanical properties and are not easy to prepare Independently supported polymer films, while the electrical conductivity of the network polymer is too small
Therefore, this kind of electrolyte system is only suitable for working under high temperature or low current conditions, and it is difficult to get practical application in lithium batteries working at normal temperature.

Method used

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  • Polycarbonate all-solid-state polymer electrolyte, all-solid-state secondary lithium battery made of same and preparation and application thereof
  • Polycarbonate all-solid-state polymer electrolyte, all-solid-state secondary lithium battery made of same and preparation and application thereof
  • Polycarbonate all-solid-state polymer electrolyte, all-solid-state secondary lithium battery made of same and preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0077] Add 2g of polypropylene carbonate and 18g of N,N-dimethylacetamide into a 100ml reagent bottle, then stir at room temperature for 6h to obtain a homogeneous polypropylene carbonate solution. Then, 0.2 g of lithium dioxalate borate was added into the above uniform solution, and stirred at room temperature for 1 day to obtain a uniform mixed solution. The solution was uniformly poured onto a petri dish, dried in a vacuum oven at 60°C for 1 day, and dried to obtain an all-solid polymer electrolyte of polypropylene carbonate.

Embodiment 2

[0079] Add 4g polyethylene carbonate and 36g N,N-dimethylformamide into a 250ml reagent bottle, then stir at room temperature for 8h to obtain a uniform polyethylene carbonate solution. Then, 0.4 g of lithium perchlorate and 0.5 g of polyethylene oxide were added into the above homogeneous solution, and stirred at room temperature for 15 h to obtain a uniform mixed solution. The solution was poured evenly on the non-woven fabric cellulose, dried in a vacuum oven at 60°C for 1 day, and dried to obtain a polyethylene carbonate / polyoxyethylene all-solid polymer electrolyte (see figure 1 ).

Embodiment 3

[0081] Add 3g of polybutylene carbonate, 0.6g of polyethylene oxide, and 20g of acetone into a 100ml reagent bottle, and then stir at room temperature for 6h to obtain a uniform polybutylene carbonate solution. Then, 0.6 g of lithium hexafluorophosphate and 0.4 g of polyacrylonitrile were added into the above uniform solution, and stirred at room temperature for 15 h to obtain a uniform mixed solution. The solution was evenly poured onto the PET non-woven film, dried in a vacuum oven at 80°C for 1 day, and dried to obtain a polybutylene carbonate / polyacrylonitrile all-solid polymer electrolyte (see image 3 ).

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Abstract

The invention relates to solid-state electrolytes, in particular to a polycarbonate all-solid-state polymer electrolyte, an all-solid-state secondary lithium battery made of the same and preparation and application thereof. The all-solid-state polymer electrolyte is prepared from polycarbonate macromolecules, lithium salt and a porous supporting material; the thickness is 20-800 micrometers, the mechanical strength is 10-80 MPa, the room temperature ion conductivity is 2*10<-5>S/cm-1*10<-3>S/cm, and the electrochemical window is higher than 4V. The all-solid-state polymer electrolyte is easy to prepare and form, good in mechanical property, high in ion conductivity and wide in electrochemical window; meanwhile, the solid-state electrolyte effectively inhibits growth of negative electrode lithium dendrites and improves interface stability and long circulation performance.

Description

technical field [0001] The invention relates to a solid electrolyte, in particular to a polycarbonate all-solid polymer electrolyte and an all-solid secondary lithium battery composed of it, as well as its preparation and application. Background technique [0002] Large-scale energy storage systems have become an important part of the future smart grid. The development of high-efficiency energy storage technologies has significant social and economic benefits for improving the utilization efficiency of existing power generation systems, power quality, and promoting the widespread application of renewable energy. One of the most promising technologies for industrialization in energy storage technology is electrochemical energy storage technology. Lithium-based batteries are regarded as the most competitive electrochemical storage technology due to their light weight, high specific energy / specific power, and long life. It is one of the energy technologies, and it is more and m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565H01M10/052
CPCY02E60/10
Inventor 崔光磊张建军赵江辉柴敬超岳丽萍刘志宏王晓刚
Owner QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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