Lithium Battery Electrolyte Additive for High-Temperature Storage
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Solution Overview
Problem
Rechargeable lithium batteries face challenges in maintaining storage characteristics at high temperatures, as the electrolyte decomposes, leading to increased internal resistance due to decreased wettability of the positive electrode and quality of the electrolyte.
Innovation Solution
Incorporating carbon nanotubes as a conductive material in the positive electrode and an imide cesium salt compound as an additive in the electrolyte, which forms a stable solid electrolyte interface, enhancing wettability and reducing resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the battery is stored at high temperature, then the energy density can be maintained, but the electrolyte decomposes and gas is generated inside the battery, causing wettability of the positive electrode to decrease and internal resistance to increase
Solution Approach 1:
The patent applies preliminary action by adding specific additives (cyclic carboxylate and cyclic carbonate) to the electrolyte composition before high-temperature storage occurs. These additives proactively form protective films on the positive electrode surface that prevent electrolyte decomposition and gas generation during subsequent high-temperature storage, thereby maintaining wettability and suppressing internal resistance increase
Solution Approach 2:
The patent applies parameter changes by modifying the electrolyte composition with specific additives (cyclic carboxylate in 0.01-5 wt% and cyclic carbonate in 5-50 wt%). These compositional parameter changes enable the electrolyte to maintain stability and prevent decomposition at high temperatures, thereby improving storage characteristics without sacrificing energy density
2Quantity of substance
If the electrolyte quality decreases due to decomposition, then the wettability of the positive electrode decreases, but this leads to an increase in internal resistance of the battery
Solution Approach 1:
The patent applies the intermediary principle by introducing cyclic carboxylate and cyclic carbonate additives as mediating substances between the electrolyte and the positive electrode. These additives form intermediate protective films that prevent direct contact and harmful reactions between the electrolyte and electrode, thereby maintaining electrolyte quality and preventing internal resistance increase
Solution Approach 2:
The patent applies parameter changes by adjusting the electrolyte composition to include cyclic carboxylate (0.01-5 wt%) and cyclic carbonate (5-50 wt%). This compositional modification changes the chemical parameters of the electrolyte system, enabling it to maintain stability and prevent decomposition, thereby preserving both electrolyte quality and low internal 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 combination effectively improves high-temperature storage characteristics by suppressing initial and increased resistance, ensuring better performance and longevity of the lithium battery.
Implementation Method 1
an imide cesium salt compound represented by Chemical Formula 1 as an additive... which forms a stable solid electrolyte interface
Implementation Method 2
the positive electrode includes a carbon nanotube as a conductive material
Data Source
AI summary
A rechargeable lithium battery includes a positive electrode; a negative electrode; and an electrolyte, where the positive electrode includes a carbon nanotube as a conductive material, and the electrolyte includes an imide cesium salt compound represented by Chemical Formula 1 as an additive: