Siloxane-Sulfur Electrolyte for Battery Cycle Life
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Solution Overview
Problem
Current electrochemical devices, such as non-aqueous electrolytic solution batteries, face limitations in cycle characteristics, discharge rate, internal resistance, and volume expansion, which affect their durability and performance over time.
Innovation Solution
Incorporating a specific compound containing silicon and sulfur atoms into the electrolytic solution, represented by a particular chemical formula, improves cycle characteristics, discharge rate, and reduces internal resistance and volume expansion by forming a stable film on electrodes and suppressing decomposition reactions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional electrolytic solutions are used, then the electrochemical device can operate, but the cycle characteristics are insufficient and durability is limited
Solution Approach 1:
The patent modifies the chemical composition parameters of the electrolytic solution by incorporating specific siloxane compounds with sulfur atoms ( formulas (1)-(4) ) at controlled concentrations (0.01-5% by mass). This chemical parameter change transforms the electrolyte's interaction with electrode surfaces, forming stable protective films that enhance cycle characteristics and extend durability simultaneously
Solution Approach 2:
The patent creates a composite electrolytic system by combining conventional electrolyte components (lithium salts, cyclic carbonates, chain carbonates) with specific siloxane-sulfur compounds. This composite approach leverages the complementary properties of conventional electrolytes (ion conductivity) and siloxane compounds (film-forming capability), achieving both good cycle characteristics and extended durability
2Productivity
If the electrochemical device is designed for high performance, then discharge rate characteristics improve, but internal resistance increases over time
Solution Approach 1:
The siloxane-sulfur compounds perform preliminary action by forming stable protective films on electrode surfaces during initial cycles. This pre-formed film prevents subsequent degradation reactions and electrolyte decomposition, thereby maintaining low internal resistance even as the device operates at high discharge rates over extended periods
3Duration of action of moving object
If the electrochemical device operates for extended periods, then more capacity is utilized, but volume expansion increases
Solution Approach 1:
The patent converts the potentially harmful expansion tendency of siloxane compounds into a beneficial effect. The siloxane-sulfur compounds undergo controlled decomposition and reorganization to form stable, space-efficient protective films on electrodes. This transforms what could be volume-expanding decomposition into a compact, stable film structure that prevents further expansion while enabling extended operational periods
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 compound enhances the cycle characteristics and discharge rate of electrochemical devices, reduces internal resistance, and minimizes volume expansion, leading to improved durability and performance over extended use.
Implementation Method 1
by forming a stable film on electrodes and suppressing decomposition reactions
Implementation Method 2
electrolytic solution comprising a compound represented by the following formula (1)... positive electrode, a negative electrode and the above electrolytic solution
Data Source
AI summary
One aspect of the present invention provides an electrolytic solution comprising a compound represented by the following formula (1):wherein R1 to R3 each independently represent an alkyl group or a fluorine atom, R4 represents an alkylene group, and R5 represents an organic group containing a sulfur atom.