Solid Electrolyte Lithium Battery Temperature Modulation for Cycle Life
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Solution Overview
Problem
Lithium-Metal-Polymer (LMP) batteries face challenges with low ionic conductivity and mechanical strength at room temperature, leading to unsatisfactory cycling resistance, particularly in solid polymer electrolytes used in electric vehicles and intermittent power storage.
Innovation Solution
A method is introduced where the charging temperature is set higher than the discharging temperature to improve cycling resistance in lithium batteries with solid or quasi-solid electrolytes, allowing for better ionic and mechanical conduction properties without altering the battery's structure or materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the operating temperature is kept relatively high (70-100°C) to maintain ionic conductivity in solid polymer electrolytes, then ionic conductivity is improved, but mechanical strength deteriorates as PEO becomes a viscous liquid and loses dimensional stability
Solution Approach 1:
The patent applies parameter changes by differentiating between charging temperature (higher) and discharging temperature (lower). During charging, the battery operates at higher temperatures to maintain ionic conductivity for Li-ion insertion into the electrolyte. During discharging, the battery operates at lower temperatures to maintain mechanical strength and dimensional stability of the PEO electrolyte, preventing it from becoming a viscous liquid.
2Reliability
If gelified polymer electrolyte is used to improve mechanical and ionic conduction properties, then ionic conductivity and mechanical strength are improved, but cycling resistance deteriorates with capacity decrease beyond 10 cycles
Solution Approach 1:
The patent applies dynamics by making the operating conditions dynamic rather than static. Instead of maintaining a constant operating temperature, the patent dynamically adjusts the temperature based on the battery's operational state: higher temperatures during charging to facilitate ion conduction, and lower temperatures during discharging to maintain structural integrity. This dynamic temperature modulation resolves the contradiction between maintaining good conduction properties and achieving long cycling resistance.
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
This approach enhances the cyclability of lithium batteries by maintaining improved ionic and mechanical conduction, enabling stable performance over a large number of cycles while maintaining safety and efficiency.
Implementation Method 1
a solid polymer electrolyte conducting lithium ions and located between the positive electrode and the negative electrode
Implementation Method 2
the charging and discharging temperatures are modulated so as to obtain a battery with improved performance in terms of cycling resistance
Data Source
AI summary
A method for operating a lithium battery, selected from solid or quasi-solid electrolyte lithium batteries, the lithium battery including at least one positive electrode, at least one solid or quasi-solid electrolyte, and at least one negative electrode, the method including that the charging and discharging temperatures are modulated so as to obtain a battery with improved cycling performance.