Solid Electrolyte Battery Thin Film Conductivity
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Solution Overview
Problem
Current solid electrolyte batteries, particularly those using Li3VO4 sintered bodies, have low conductivity at room temperature and lack stability over a wide temperature range, limiting their performance and usability in portable electronic devices.
Innovation Solution
A solid electrolyte battery with a thin film solid electrolyte layer formed from compounds like Li3MO4 (M=V, Nb, Ta, or Db), which is at least partially amorphous, and optionally nitrogen-containing, to enhance conductivity and stability across varying temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If Li3VO4 sintered body is used as solid electrolyte, then battery structure is simple and manufacturable, but conductivity is low (10^-8 to 10^-9 S/cm at room temperature)
Solution Approach 1:
The patent applies parameter changes by transforming the solid electrolyte from a sintered body structure to a thin film structure. This structural parameter change increases the surface area to volume ratio and modifies the conduction pathways, resulting in significantly improved conductivity (10^-6 to 10^-7 S/cm at room temperature) while maintaining manufacturability through established thin film deposition techniques.
Solution Approach 2:
The patent employs composite materials by combining Li3VO4 with other lithium compounds such as Li2SiO3, Li2SiO2, or Li2CO3 to form a composite solid electrolyte thin film. This composite approach leverages the complementary properties of different materials to achieve both high conductivity and structural stability, resolving the contradiction between manufacturability and performance.
2Device complexity
If conventional solid electrolyte is used, then battery structure is simple, but battery performance is unstable over wide temperature range
Solution Approach 1:
The patent uses composite materials consisting of Li3VO4 combined with thermally stable compounds like Li2SiO3 or Li2SiO2. This composite structure maintains structural simplicity while achieving stable battery performance across a wide temperature range (-30°C to 80°C) by leveraging the thermal stability of the silicate components.
Solution Approach 2:
The patent applies parameter changes by controlling the phase composition and crystalline structure of the solid electrolyte thin film through specific deposition conditions and post-treatment processes. This enables the material to maintain stable ionic conductivity and structural integrity across varying temperatures without complicating the overall battery design.
3Ease of manufacture
If Li3VO4 sintered body is used, then manufacturing process is simple, but energy density is insufficient for portable electronics
Solution Approach 1:
The patent employs thin film technology to create a solid electrolyte layer with thickness of 1-10 micrometers. This thin film approach dramatically reduces the volume occupied by the electrolyte while maintaining or improving ionic conductivity, thereby increasing the overall energy density of the battery without complicating the manufacturing process.
Solution Approach 2:
The patent applies parameter changes by transitioning from bulk sintered material to thin film structure, which fundamentally alters the transport properties and reduces resistance. This parameter change enables higher energy density by improving the efficiency of ionic transport per unit volume, making the battery suitable for portable electronic devices.
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 solution achieves higher conductivity and stable battery performance over a wide temperature range, reducing internal resistance and improving energy density, making the batteries more suitable for portable electronics.
Implementation Method 1
the solid electrolyte layer being a thin film formed of a compound of the formula Li3MO4 (M=V, Nb, Ta, or Db), and the thin film being at least partially an amorphous phase
Data Source
AI summary
A solid electrolyte battery using a solid electrolyte capable of realizing high conductivity, and a process for producing a solid electrolyte battery are provided. The solid electrolyte battery is structured as a laminate of a positive electrode collector layer, a positive electrode active material layer, a solid electrolyte layer, a negative electrode active material layer, and a negative electrode collector layer formed in order on a substrate. The solid electrolyte layer is a thin film formed of a compound of the formula Li3 M04 (M =V, Nb, Ta, or Db).