Rechargeable Lithium Battery Electrolyte for High-Temperature Resistance
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Solution Overview
Problem
Rechargeable lithium batteries experience increased resistance and decreased cycle-life at high temperatures, which existing electrolyte additives fail to effectively address.
Innovation Solution
Incorporating a lithium imide salt and a specific additive, represented by Chemical Formula 1, into the electrolyte, along with carbon nanotubes of defined length and content in the negative electrode, to improve high-temperature characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional electrolyte composition is used, then the battery structure is simple and manufacturing is easy, but resistance increases and cycle-life decreases at high temperatures
Solution Approach 1:
The patent introduces specific chemical composition parameters (electrolyte additives, lithium imide salt concentration) and physical structure parameters (carbon nanotube length 5-100 μm, diameter 0.5-2.0 μm, content 0.5-2.0 wt%) to optimize high-temperature storage characteristics. These controlled parameter changes improve reliability while maintaining manageable device complexity through defined specifications
2Reliability
If carbon nanotube content is increased to improve conductivity, then electrical conductivity improves, but the structural complexity and manufacturing difficulty increase
Solution Approach 1:
The patent optimizes carbon nanotube parameters (length 5-100 μm, diameter 0.5-2.0 μm, content 0.5-2.0 wt%) to achieve adequate electrical conductivity without excessive structural complexity. This controlled parameter approach ensures sufficient conductive network formation while maintaining manageable electrode structure and manufacturing processes
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 solution significantly reduces resistance and enhances cycle-life by optimizing the electrolyte composition and negative electrode conductive material, thereby improving the battery's high-temperature performance.
Implementation Method 1
a positive electrode including a positive electrode active material; a negative electrode including an negative electrode active material layer
Implementation Method 2
the carbon nanotube is included in an amount of about 0.5 to about 2 wt % based on a total amount of the negative electrode active material layer
Data Source
AI summary
A rechargeable lithium battery including an electrolyte, a positive electrode including a positive electrode active material, and a negative electrode including a negative electrode active material is provided. The electrolyte includes a combination of additives and lithium salts and a length and amount of a negative electrode active material.