Anode Coating with SO3 Compound for Battery Swelling Prevention
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Solution Overview
Problem
Lithium ion secondary batteries using liquid electrolytes face challenges in forming thin, flexible designs due to leakage concerns, and batteries with gelatinous electrolytes can swell at high temperatures due to electrolyte decomposition.
Innovation Solution
Incorporating a coating on the anode containing a SO3-containing compound, which is preferentially reduced to prevent electrolyte decomposition, thereby preventing battery swelling in high temperature environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If gelatinous electrolyte is used instead of liquid electrolyte, then leakage is prevented and battery shape flexibility is improved, but battery swelling occurs at high temperatures due to electrolyte decomposition
Solution Approach 1:
The patent applies preliminary action by forming a coating containing a SO3-containing compound on the anode surface before battery operation. This coating is preferentially reduced during initial charging cycles to form a protective layer that prevents electrolyte decomposition and subsequent battery swelling at high temperatures, while maintaining the leakage prevention benefits of gelatinous electrolyte
Solution Approach 2:
The patent uses an intermediary substance (SO3-containing compound coating) on the anode surface that mediates between the gelatinous electrolyte and the anode. This intermediary layer is preferentially reduced to form a stable interface that prevents direct harmful interactions between the electrolyte and anode, thereby preventing battery swelling while maintaining the flexibility advantages of gelatinous electrolyte
2Reliability
If coating containing SO3-containing compound is added to anode, then electrolyte decomposition is prevented, but device complexity increases
Solution Approach 1:
The patent applies local quality by adding the SO3-containing compound coating only to the anode surface where it is most needed for preventing electrolyte decomposition. This localized treatment maintains the simple overall battery structure while providing targeted protection at the critical electrode-electrolyte interface, thus improving reliability without significantly increasing device complexity
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 anode coating effectively reduces electrolyte decomposition, allowing for the prevention of battery swelling and maintaining capacity retention even at high temperatures.
Implementation Method 1
the SO3-containing compound is preferentially reduced and decomposed to become a sulfur-containing compound
Implementation Method 2
the electrolyte contains an electrolyte salt having reduction power
Data Source
AI summary
A battery capable of reducing swelling is provided. A battery includes a cathode, an anode and an electrolyte. The anode includes a coating containing a SO3-containing compound, and the electrolyte contains an electrolyte salt having reduction power. Therefore, on the surface of the anode, the SO3-containing compound is preferentially reduced and decomposed to become a sulfur-containing compound. In the result, decomposition reaction of the electrolyte is prevented.