Boron Nitride Gel Electrolytes for High-Temperature Li-Ion Cells
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Lithium-ion batteries face significant performance limitations and safety concerns due to their limited operating temperature range and stability, with most commercial cells being unreliable above 60°C and none surviving operation above 100°C, leading to potential thermal runaway and explosion.
Innovation Solution
Incorporating boron nitride aerogel (BNAG) or boron nitride nanotubes (BNNTs) into the electrolyte of lithium-ion batteries to enhance thermal stability, using a polymer-ionic liquid gel electrolyte with these nanomaterials to maintain high capacity and cyclability up to 190°C.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If lithium-ion batteries are operated at high temperatures above 60°C, then the battery can maintain operation under elevated temperature conditions, but the internal temperature increase accelerates reaction rates between electrolyte and electrodes leading to thermal runaway and explosion
Solution Approach 1:
A boron nitride aerogel layer is introduced as an intermediary thermal barrier between the electrodes and electrolyte. This aerogel layer mediates heat transfer by providing thermal insulation while allowing ionic conductivity, preventing direct thermal contact that would accelerate harmful reactions between electrolyte and electrodes at elevated temperatures.
Solution Approach 2:
The boron nitride aerogel creates an inert thermal environment within the battery cell by providing exceptional thermal stability and chemical inertness. This inert barrier prevents thermally-induced chemical reactions between the electrolyte and electrode materials, maintaining battery safety even when operated above 60°C.
2Temperature
If lithium-ion batteries are operated above 100°C, then the battery can withstand extreme temperature conditions, but commercial cells cannot survive operation above 100°C due to thermal runaway
Solution Approach 1:
The patent changes the thermal parameter of the battery system by incorporating boron nitride aerogel with exceptional thermal stability. This material parameter change enables the battery to withstand temperatures above 100°C by providing a stable thermal environment that prevents electrolyte decomposition and maintains structural integrity under extreme temperature conditions.
Solution Approach 2:
The battery employs a composite structure combining boron nitride aerogel with electrode and electrolyte materials. This composite approach creates a thermally-stable system where the aerogel matrix provides thermal protection while maintaining ionic conductivity, enabling stable operation above 100°C without electrolyte degradation.
3Temperature
If the battery operates at elevated temperatures, then the battery can function in high-temperature environments, but mechanical stress damages the electrolyte and separator resulting in increased internal resistance
Solution Approach 1:
The boron nitride aerogel layer serves as a pre-positioned cushioning barrier that absorbs and distributes mechanical stress before it can damage the electrolyte and separator. This protective cushioning effect prevents stress-induced damage to critical battery components during thermal cycling and operation at elevated temperatures.
Solution Approach 2:
The aerogel functions as a flexible yet structurally-supportive thin film barrier between electrodes and electrolyte. This film structure accommodates thermal expansion and mechanical stress while maintaining the integrity of the electrolyte and separator, preventing stress-induced failures at elevated operating temperatures.
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 integration of BNAG or BNNTs into the electrolyte structure significantly increases the reliable operating temperature of lithium-ion batteries to 190°C, ensuring safe and efficient operation with improved thermal protection and extended cycle life, while maintaining high performance.
Implementation Method 1
Incorporating boron nitride aerogel (BNAG) or boron nitride nanotubes (BNNTs) into the electrolyte of lithium-ion batteries to enhance thermal stability
Data Source
AI summary
This disclosure provides systems, methods, and apparatus related to Li-ion batteries. In one aspect an electrolyte structure for use in a battery comprises an electrolyte and an interconnected boron nitride structure disposed in the electrolyte.