Cylindrical Li Battery Electrolyte for High-Temperature Cycle Life
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Solution Overview
Problem
Rechargeable lithium batteries experience increased resistance and reduced cycle-life at high temperatures, particularly when using a cylindrical can, due to complications arising from the can's volume and electrolyte composition.
Innovation Solution
Incorporating a non-aqueous organic solvent, a lithium imide salt, and an electrolyte additive represented by Chemical Formula 1, with the lithium imide salt comprising 20-70 wt% of the lithium salt, into the battery's electrolyte, while controlling the cylindrical can's volume between 10-140 cm³, to enhance high-temperature characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a cylindrical can is used to house the electrode assembly, then the battery structure is simplified and manufacturing is easier, but resistance increases and cycle-life decreases at high temperatures
Solution Approach 1:
The patent applies parameter changes by optimizing the cylindrical can volume to a specific range (10-140 cm³) and adjusting the electrolyte composition parameters, specifically incorporating lithium imide salt at 20-70 wt% and fluoride-containing additives at 0.1-10 wt%, to resolve the contradiction between manufacturing simplicity and high-temperature reliability
Solution Approach 2:
The patent uses composite materials by formulating a complex electrolyte system that combines non-aqueous organic solvent, lithium imide salt, and fluoride-containing additives, creating a composite electrolyte composition that maintains stability and reduces resistance increase at high temperatures while preserving the simple cylindrical can structure
2Use of energy by moving object
If the cylindrical can volume is increased to accommodate larger electrode assemblies, then energy density per unit weight improves, but resistance increase and cycle-life degradation at high temperatures become more severe
Solution Approach 1:
The patent applies parameter changes by establishing an optimal cylindrical can volume range (10-140 cm³) that balances energy density with high-temperature reliability, and by adjusting electrolyte composition parameters including lithium imide salt concentration (20-70 wt%) and fluoride additive content (0.1-10 wt%) to mitigate resistance increase in larger batteries
Solution Approach 2:
The patent applies preliminary anti-action by incorporating fluoride-containing additives and lithium imide salt into the electrolyte composition before battery operation, which preemptively suppresses resistance increase and prevents severe cycle-life degradation at high temperatures, allowing larger battery volumes to achieve high energy density without proportionally increased reliability issues
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 configuration effectively suppresses resistance increases and improves cycle-life by optimizing the electrolyte composition and can volume, thereby enhancing the battery's performance at high temperatures.
Implementation Method 1
a rechargeable lithium battery including a cylindrical can; an electrode assembly in the cylindrical can; and an electrolyte in the electrode assembly
Data Source
AI summary
A rechargeable lithium battery including a cylindrical can; an electrode assembly in the cylindrical can; and an electrolyte in the electrode assembly is provided. An electrolyte additive and a lithium imide salt are included in the electrolyte and the volume of a cylindrical can is well-defined.