Nitrogen-Free LixPOy Solid Electrolyte for Microbatteries
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Solution Overview
Problem
Current "all-solid-state" microbatteries face limitations in ionic conductivity, which restrict their performance and ability to handle high currents without compromising capacity, particularly in applications like RFID tags and memory cards.
Innovation Solution
A solid electrolyte film comprising LixPOy without nitrogen, with controlled lithium and oxygen levels (3.6≤x≤6.3 and 1.5≤y≤4), manufactured using physical vapor deposition without a magnetron, achieving ionic conductivity greater than or equal to 10−5 S/cm.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If LiPON electrolyte with nitrogen is used in microbatteries, then ionic conductivity is improved, but power maintenance deteriorates due to insufficient conductivity at high currents
Solution Approach 1:
The invention changes the chemical composition parameters of the electrolyte by eliminating nitrogen and precisely controlling the Li/O ratio (3.6≤x≤6.3 and 1.5≤y≤4 in LixPOy). This parameter optimization achieves ionic conductivity ≥10−5 S/cm, resolving the contradiction between reliability and power maintenance by enabling both high conductivity and sustained power delivery at high currents
Solution Approach 2:
The invention creates an optimized composite electrolyte material LixPOy with specific stoichiometric ratios, combining lithium, phosphorus, and oxygen in precise proportions. This composite approach achieves superior ionic conductivity compared to conventional LiPON, simultaneously improving both reliability and power characteristics
2Reliability
If nitrogen-containing electrolyte compounds are used, then ionic conductivity increases, but electrochemical stability decreases
Solution Approach 1:
The invention extracts and eliminates nitrogen from the electrolyte composition, removing the harmful element that compromises electrochemical stability. By taking out nitrogen while maintaining high ionic conductivity through optimized Li/O ratios, the invention resolves the contradiction between conductivity and stability
Solution Approach 2:
The invention changes the chemical composition by removing nitrogen and optimizing the Li/O ratio parameters. This parameter optimization achieves ionic conductivity ≥10−5 S/cm without nitrogen, simultaneously improving both reliability and electrochemical stability
3Ease of manufacture
If conventional LiPON electrolyte is used, then manufacturing is simplified, but performance is insufficient for novel applications like RFID tags and memory cards
Solution Approach 1:
The invention optimizes the chemical parameters of the electrolyte (Li/O ratio in LixPOy) to achieve superior performance while maintaining compatibility with existing thin-film deposition technologies. This parameter optimization enables both ease of manufacture and enhanced performance for novel applications
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 enhanced ionic conductivity improves power maintenance and performance of microbatteries, allowing operation with high currents without capacity loss, and provides better electrochemical stability.
Implementation Method 1
a step of physical vapour deposition using an Li3PO4 target sputtered under nitrogen
Implementation Method 2
an Li3PO4 target sputtered under nitrogen so as to obtain a layer comprising LixPOy
Data Source
AI summary
A solid electrolyte including a layer of LixPOy, free from nitrogen, with 3.6≤x≤6.3 and 1.5≤y≤4, and the ionic conductivity of which is greater than or equal to 10−5 S/cm. A microbattery including a layer of solid electrolyte.