Solid-State Battery Water Control for High Voltage Stability
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Solution Overview
Problem
Solid-state batteries with water content in the internal electrode body face instability and high probability of short circuits when high voltage is applied, as water acts as a conductor rather than a solid electrolyte, leading to unreliable operation.
Innovation Solution
An electrochemical device with a laminated body containing a predetermined amount of water, where 0.001 to 0.3 mass% water is impregnated, with 50% to 90% of it being bound water, stabilizing the device and reducing internal resistance, allowing for stable operation under high voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If water is contained in the internal electrode body at a high ratio (1.3 to 10 mass %), then initial discharge capacity is increased, but the probability of short circuit increases and stable operation cannot be maintained when high voltage is applied
Solution Approach 1:
The patent applies parameter changes by precisely controlling the water content ratio from 1.3-10 mass% down to 0.03-5 mass%, and further optimizing to 0.001-0.3 mass% in the improved embodiment. This quantitative parameter adjustment transforms water from a harmful substance causing short circuits into a beneficial component that enhances discharge capacity while maintaining stability. The bound water ratio parameter (50-90%) is also controlled to ensure water molecules are properly bonded to the electrode body structure.
Solution Approach 2:
The patent converts water from a harmful factor into a beneficial one by controlling it to exist as bound water rather than free water. The water molecules are bonded to the internal electrode body structure, preventing them from acting as conduction carriers that cause short circuits. Instead, the bound water enhances discharge capacity while the low total water content (0.001-0.3 mass%) prevents short circuit formation, thus turning a potential harm into a benefit.
2Productivity
If water acts as a carrier of conduction in a humid environment, then initial discharge capacity is improved, but the probability of short circuit of the device increases
Solution Approach 1:
The patent converts water from a harmful conduction carrier into a beneficial bound water component. By controlling the water to be bound to the electrode body structure rather than free water, it prevents water from acting as an unintended conduction path that would cause short circuits. The bound water still contributes to discharge capacity enhancement while eliminating the short circuit hazard.
Solution Approach 2:
The patent applies local quality by creating different states of water within the electrode body. The water is specifically bound to certain regions of the internal electrode body structure, creating localized bound water regions rather than uniform free water distribution. This localized binding prevents water from forming continuous conduction paths while maintaining the capacity-enhancing effects in specific areas.
3Reliability
If a solid electrolyte is used to avoid liquid leakage, then safety is improved, but the output is small as compared with an electrochemical device using an electrolytic solution
Solution Approach 1:
The patent creates a composite system combining solid electrolyte with controlled bound water content in the electrode body. The solid electrolyte provides safety by eliminating liquid leakage risks, while the bound water in the electrode body (0.001-0.3 mass%) enhances discharge capacity. This composite approach integrates the safety advantage of solid electrolytes with the high output characteristic of water-containing systems, achieving both safety and high power output simultaneously.
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 device maintains stable operation and deep charge depth even at high voltages, reducing the risk of short circuits and improving ion conductivity, thus enabling efficient charging and discharging.
Implementation Method 1
a part of the water is a bound water bonding with a constituent of the laminated body
Implementation Method 2
An electrolyte serving as a medium for movement of ions is used in various applications such as batteries
Data Source
AI summary
An electrochemical device has a laminated body including: a positive electrode; a negative electrode; and a solid electrolyte sandwiched between the positive electrode and the negative electrode, wherein the laminated body contains water, a content of the water contained in the laminated body is 0.001 mass % or more and less than 0.3 mass % with respect to the laminated body, a part of the water is a bound water bonding with a constituent of the laminated body, and a ratio of the bound water in the water is 50% or more and 90% or less.