All-Solid Ion Battery Conductive Polymer Coating
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Solution Overview
Problem
Conventional all-solid lithium secondary batteries face performance deterioration due to low ionic conductivity of solid electrolytes and poor electrode/electrolyte interfaces, which affects stability and power characteristics.
Innovation Solution
The use of a powder-form solid electrolyte coated with a first conductive polymer film, such as PEO, and an electrode active material coated with a second conductive polymer film, like PEO-PEDOT block copolymer, enhances ion and electron transport, increasing the contact area and absorbing volume changes during charging and discharging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If solid electrolyte is used to replace liquid electrolyte, then safety is improved, but ionic conductivity deteriorates
Solution Approach 1:
The patent uses composite materials by combining solid electrolyte particles with conductive polymer coating films. The solid electrolyte provides safety while the conductive polymer coating (such as PEO, PEDOT, or their block copolymers) enhances ionic conductivity at the electrode interface, creating a composite structure that resolves the contradiction between safety and ionic conductivity.
Solution Approach 2:
The patent changes the physical and chemical parameters of the electrolyte system by coating solid electrolyte particles with conductive polymers. This modification alters the surface properties and ionic transport characteristics, improving ionic conductivity without compromising the inherent safety advantages of solid electrolytes.
2Quantity of substance
If solid electrolyte is used to replace liquid electrolyte, then energy density is improved, but electrode/electrolyte interface quality deteriorates
Solution Approach 1:
The conductive polymer coating film acts as an intermediary layer between the solid electrolyte and the electrode active material. This intermediary improves the interface quality by enhancing contact and facilitating ion transport, while allowing the solid electrolyte to maintain its high energy density advantages through the use of Li-metal or Li-alloy anodes.
3Power
If conductive polymer coating films are added to solid electrolyte, then ionic conductivity is improved, but device complexity increases
Solution Approach 1:
The patent uses thin conductive polymer coating films on solid electrolyte particles to improve ionic conductivity. These thin films add minimal structural complexity while effectively enhancing the electrode/electrolyte interface properties, resolving the contradiction between improved conductivity and increased device complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration improves the stability and power characteristics of the all-solid ion battery by increasing ionic conductivity and contact area, leading to enhanced performance and longer battery life.
Implementation Method 1
a first conductive polymer coating film coated on at least a portion of the solid electrolyte and capable of transporting ions
Implementation Method 2
a second conductive polymer coating film coated on at least a portion of the electrode active material and capable of transporting ions and electrons
Data Source
AI summary
The present invention provides an all-solid ion battery having improved stability and power characteristics and comprising: a powder-form solid electrolyte; a powder-form electrode active material; a first conductive polymer coating film coated on at least a portion of the solid electrolyte and capable of transporting ions; and a second conductive polymer coating film coated on at least a portion of the electrode active material and capable of transporting ions and electrons.