Lithium Primary Battery Composite Electrolyte Two-Stage Discharge
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Solution Overview
Problem
Lithium thionyl and lithium sulfonyl batteries face limitations in temperature range and rapid capacity decrease, especially at low temperatures, and lack effective methods to monitor remaining capacity during use.
Innovation Solution
A lithium primary battery using a composite electrolyte, prepared by mixing sulfonyl (SO2Cl2) and thionyl (SOCl2) electrolytes in a specific weight ratio, enabling two-stage discharging with distinct voltage levels, allowing for monitoring of battery usage and capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If lithium thionyl electrolyte is used, then broad temperature range and long-term use are achieved, but rapid capacity decrease occurs under high current
Solution Approach 1:
The patent combines lithium thionyl electrolyte and lithium sulfonyl electrolyte in a composite electrolyte system. The thionyl electrolyte provides broad temperature range adaptability, while the sulfonyl electrolyte contributes to capacity stability under high current conditions, achieving synergistic effects that resolve the contradiction between temperature adaptability and capacity stability.
Solution Approach 2:
The patent uses a composite electrolyte made from two different electrolyte compositions (thionyl and sulfonyl) with specific weight ratios. This composite approach allows the battery to inherit the advantageous properties of both electrolytes, enabling broad temperature operation while maintaining stable capacity under high current discharge.
2Reliability
If lithium sulfonyl electrolyte is used, then capacity is maintained under high current and voltage, but rapid capacity decrease occurs at low temperature
Solution Approach 1:
The patent merges lithium sulfonyl electrolyte and lithium thionyl electrolyte in a composite system. The sulfonyl electrolyte provides capacity stability under high current and voltage, while the thionyl electrolyte extends the operating temperature range down to -55°C, resolving the contradiction between capacity stability and temperature adaptability.
3Device complexity
If single electrolyte system is used, then simple structure is maintained, but remaining capacity cannot be monitored
Solution Approach 1:
The patent uses the composite electrolyte system as an intermediary mechanism that enables remaining capacity monitoring. The two-stage discharge process, where each electrolyte component becomes active at different voltage levels, serves as a natural indicator of battery state, providing remaining capacity information without requiring additional complex monitoring systems.
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 composite electrolyte battery achieves two-stage discharging with maintained voltage levels, enabling effective monitoring of battery usage and capacity, improving performance at low temperatures and extending battery life.
Implementation Method 1
a lithium primary battery using a composite electrolyte has a bobbin shape and includes a lithium anode including a metal lithium; a cathode including a carbon powder
Implementation Method 2
the composite electrolyte that is contained in a battery case, wherein the composite electrolyte is prepared by mixing a sulfonyl (SO2Cl2) electrolyte and a thionyl (SOCl2) electrolyte
Data Source
AI summary
Disclosed is a lithium primary battery using a composite electrolyte, wherein, in order to maximize advantages of a lithium thionyl battery and a lithium sulfonyl battery, electrolytes of the two batteries are mixed to proceed two-stage discharging, thereby making it possible to check the battery usage.