Solid-State Battery Electrode Layout for Moisture-Resistant Connections
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Solution Overview
Problem
Lithium secondary batteries face challenges with high voltage implementation, electrolyte leakage, and fire/explosion risks due to liquid electrolytes, and ceramic-based solid electrolytes suffer from poor ionic conductivity and charging/discharging efficiency issues at the electrode interface.
Innovation Solution
An all-solid-state battery design with a solid electrolyte layer and cathode/anode configuration, where current collecting electrodes are minimally exposed and covered with ceramic layers, allowing for simultaneous sintering of the battery body and electrodes to enhance moisture resistance and mechanical strength, and simplify production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If liquid electrolyte is used in lithium secondary battery, then discharge capacity and energy density are high, but high voltage implementation is difficult and risk of electrolyte leakage, fire, or explosion increases
Solution Approach 1:
The patent changes the physical state of the electrolyte from liquid to solid, fundamentally altering the parameter of electrolyte phase. This transformation eliminates the safety issues associated with liquid electrolytes (leakage, fire, explosion) while maintaining high energy density through the solid-state configuration and optimized electrode structure
Solution Approach 2:
The patent employs composite material structures including solid electrolyte layers combined with ceramic protective layers, and multi-layer electrode configurations. These composite structures provide both the high energy density benefits and enhanced safety characteristics required to resolve the contradiction
2Reliability
If ceramic-based solid electrolyte is used, then stability is high, but ionic conductivity and charging/discharging efficiency deteriorate due to poor contact at interface between electrolyte and electrode
Solution Approach 1:
The patent applies local quality optimization by creating intimate contact between the solid electrolyte and electrode materials at the interface regions. The electrode structure is designed with specific local characteristics that enhance contact quality, ensuring efficient ion transfer while maintaining the overall stability of the ceramic-based solid electrolyte system
Solution Approach 2:
The patent optimizes parameters such as sintering temperature, pressure, and composition ratios to achieve the desired balance between stability and ionic conductivity. By carefully controlling these parameters during manufacturing, the system achieves both high stability and efficient charging/discharging performance
3Ease of operation
If current collecting electrodes are exposed, then electrical connection is achieved, but moisture resistance and mechanical strength are compromised
Solution Approach 1:
The patent introduces ceramic protective layers as intermediary structures between the exposed current collecting electrodes and the external environment. These protective layers serve as mediators that maintain electrical connection functionality while providing barrier protection against moisture ingress and mechanical damage
Solution Approach 2:
The patent creates composite structures combining conductive current collecting electrode materials with protective ceramic coatings. This composite approach allows the system to simultaneously achieve electrical connectivity and environmental protection, resolving the contradiction between ease of operation and reliability
4Manufacturing precision
If multiple separate manufacturing steps are used, then manufacturing precision is maintained, but production process complexity and time increase
Solution Approach 1:
The patent merges multiple manufacturing steps into an integrated process where electrode assembly, solid electrolyte formation, and protective layer application are combined. This merging reduces production process complexity and time while maintaining manufacturing precision through coordinated process control and integrated tooling
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 design achieves high reliability in moisture resistance, improved mechanical strength, and a simplified production process, enabling the creation of small-sized, efficient solid-state batteries with enhanced performance.
Implementation Method 1
a solid electrolyte layer and a cathode and an anode stacked in the third direction with the solid electrolyte layer interposed therebetween
Implementation Method 2
simultaneous sintering of the battery body and electrodes
Data Source
AI summary
An all solid state battery includes: a battery body including an electrode assembly having first and second surfaces in a first direction, third and fourth surfaces in a second direction, and fifth and sixth surfaces in a third direction, and including a solid electrolyte layer and a cathode and an anode,; a first connection portion; and a second connection portion disposed on the electrode assembly. The first connection portion includes a first current collecting electrode and a first protection portion, the second connection portion includes s a second current collecting electrode and a second protection portion, and the first current collecting electrode is drawn out to one surface of the first connection portion in the third direction and the second current collecting electrode is drawn out to one surface of the second connection portion in the third direction.