Solid-State Battery Electrode Coating for Lower Interface Resistance
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Solution Overview
Problem
All-solid-state lithium secondary batteries face increased electrode resistance due to voids between materials, which obstruct electron and ion conduction paths, leading to decreased discharge voltage and energy density.
Innovation Solution
Incorporating a conductive additive with a carbonaceous conductive material coated by a conductive polymer, specifically a π-conjugated conductive polymer and polyanion, to enhance electron conductivity and reduce interface resistance between the conductive additive and solid electrolyte.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a solid electrolyte is used in all-solid-state lithium secondary batteries, then safety and energy density are improved, but electrode resistance increases due to voids between materials
Solution Approach 1:
The patent introduces a coating film as an intermediary layer between the solid electrolyte and electrode active material. This coating film fills the voids and improves interfacial contact, thereby reducing electrode resistance while maintaining the benefits of solid electrolyte usage.
Solution Approach 2:
The patent applies a coating film specifically at the interface between the solid electrolyte and electrode active material, rather than uniformly throughout the entire electrode. This localized treatment addresses the specific problem of interfacial voids without compromising the overall solid electrolyte structure.
2Object-affected harmful factors
If conductive additives are added to reduce electrode resistance, then electron conductivity is improved, but voids between materials increase
Solution Approach 1:
The patent uses a composite coating film structure consisting of a polymer electrolyte matrix combined with conductive filler particles. This composite structure provides both electrical conductivity and space-filling capability, reducing voids while maintaining low electrode resistance.
Solution Approach 2:
The coating film is designed with a porous or network structure that allows it to fill irregular voids between solid electrolyte particles and electrode active material. The porous structure adapts to the interfacial geometry, improving contact without adding excessive volume.
3Object-affected harmful factors
If the amount of conductive additive is increased to compensate for insufficient electron conductivity, then electrode resistance decreases, but energy density decreases
Solution Approach 1:
The coating film acts as an intermediary that provides efficient electron conduction pathways at the critical solid electrolyte-electrode active material interface. This localized conduction enhancement reduces the need for bulk conductive additives throughout the electrode, preserving energy density.
Solution Approach 2:
The patent changes the local electrical conductivity parameter at the interface by applying a conductive coating film, rather than uniformly increasing conductive additive content throughout the entire electrode. This targeted parameter modification achieves low resistance while minimizing impact on energy density.
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
The configuration decreases electrode resistance, increases discharge voltage, and improves charge and discharge characteristics of the battery.
Implementation Method 1
the conductive additive includes a carbonaceous conductive material and a coating film coating a surface of the carbonaceous conductive material, and the coating film includes a conductive polymer
Data Source
AI summary
An electrode of the present disclosure includes an electrode active material, a solid electrolyte, and a conductive additive. The conductive additive includes a carbonaceous conductive material, and a coating film coating a surface of the carbonaceous conductive material. The coating film includes an electrically conductive polymer. A battery of the present disclosure includes a positive electrode, a negative electrode, and an electrolyte layer positioned between the positive electrode and the negative electrode. At least one selected from the group consisting of the positive electrode and the negative electrode is the electrode of the present disclosure. The electrolyte layer includes a solid electrolyte.