Solid-State Lithium Battery Electrode Coating for Lower Interfacial Resistance
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Solution Overview
Problem
All solid-state lithium batteries face issues with high interfacial resistance due to poor contact between the solid-state electrolyte composite membrane and electrodes, and low lithium ion conductivity, which affects their performance and safety.
Innovation Solution
A method involving the dispersion of lithium-substituted Nafion in N-methylpyrrolidone to form a lithium-substituted Nafion dispersion, applied on metal foils to create anode and cathode sheets, combined with a solid polymer electrolyte composite membrane, using specific lithium ion conductive composite materials to enhance conductivity and reduce resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a solid-state electrolyte composite membrane is used to prevent safety problems, then safety is improved, but interfacial resistance increases due to poor contact with electrodes
Solution Approach 1:
The patent introduces a solid polymer electrolyte composite membrane as an intermediary layer between the liquid electrolyte and electrodes. This membrane serves as a mediator that maintains electrical conductivity while preventing direct contact between liquid electrolyte and electrodes, thereby reducing interfacial resistance while maintaining safety benefits
Solution Approach 2:
The patent uses a composite structure combining liquid electrolyte and solid polymer electrolyte membrane. The composite material leverages the high conductivity of liquid electrolyte and the safety advantages of solid membrane, achieving both low interfacial resistance and improved safety
2Reliability
If a solid-state electrolyte composite membrane is used, then safety is improved, but lithium ion conductivity decreases at room temperature
Solution Approach 1:
The patent merges the advantages of liquid electrolyte (high lithium ion conductivity) and solid polymer electrolyte membrane (safety) into a hybrid system. The liquid electrolyte provides high ion conductivity while the solid membrane ensures safety, achieving both objectives simultaneously
Solution Approach 2:
The patent applies different electrolyte types in different locations: liquid electrolyte is used where high conductivity is needed (in contact with electrodes), while solid polymer membrane is used where safety is prioritized (as the main electrolyte layer). This local differentiation optimizes both conductivity and safety
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 method results in improved lithium ion conductivity and reduced interfacial resistance, leading to higher discharge specific capacity, coulombic efficiency, and discharge capacity retention in all solid-state lithium batteries.
Implementation Method 1
dispersing a lithium-substituted Nafion in N-methylpyrrolidone in an amount ranging from 0.5 wt % to 5.0 wt % based on 100 wt % of N-methylpyrrolidone to form a lithium-substituted Nafion dispersion
Implementation Method 2
a solid polymer electrolyte composite membrane including a lithium ion conductive composite material
Data Source
AI summary
Disclosed herein is a method for manufacturing an all solid-state lithium battery, in which a lithium-substituted Nafion is dispersed in N-methylpyrrolidone in an amount ranging from 0.5 wt % to 5.0 wt % to form a lithium-substituted Nafion dispersion and an active material is dispersed in the lithium-substituted Nafion dispersion in a weight ratio of the lithium-substituted Nafion to the active material ranging from 0.05:100 to 5.00:100.