Lithium Battery Electrolyte Additives for High-Temperature Gas Suppression
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Rechargeable lithium batteries face challenges in maintaining charge/discharge characteristics and cycle-life performance, especially when stored at high temperatures, and they also generate excessive gas, which can lead to battery deterioration.
Innovation Solution
The use of a rechargeable lithium battery design that incorporates a positive electrode with a lithium nickel composite oxide active material, an electrolyte solution containing a non-aqueous organic solvent, a lithium salt, and additives such as a first compound (e.g., triallyl isocyanurate) and a second compound (e.g., 2-fluoro-4-methyl-1,3,2-dioxaphospholane), which help in forming stable solid electrolyte interface films and reducing gas generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional electrolyte solutions are used in rechargeable lithium batteries, then basic battery operation is maintained, but charge/discharge characteristics deteriorate at high temperatures and excessive gas is generated
Solution Approach 1:
The patent modifies the chemical composition parameters of the electrolyte by introducing a specific additive (lithium bis(fluorosulfonyl)imide) to change the electrochemical properties of the system, thereby improving charge/discharge characteristics and reducing gas generation at high temperatures
Solution Approach 2:
The lithium bis(fluorosulfonyl)imide additive acts as an intermediary substance that mediates between the electrode and conventional electrolyte, forming a protective interface layer that prevents harmful side reactions and reduces gas generation while maintaining ionic conductivity
2Productivity
If batteries are stored at high temperatures to maintain performance, then operational characteristics are maintained, but cycle-life characteristics deteriorate
Solution Approach 1:
The lithium bis(fluorosulfonyl)imide additive provides beforehand cushioning by forming a stable protective film on the electrode surface before thermal degradation can occur, cushioning against high-temperature damage and extending cycle life while maintaining operational characteristics
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 improves the charge/discharge characteristics and cycle-life performance of the battery at both room and high temperatures, while significantly reducing gas generation during high-temperature storage, thus enhancing the overall stability and efficiency of the battery.
Implementation Method 1
an electrolyte solution for a rechargeable lithium battery including a non-aqueous organic solvent, a lithium salt, and an additive
Implementation Method 2
an electrolyte solution for a rechargeable lithium battery including a non-aqueous organic solvent, a lithium salt, and an additive
Implementation Method 3
electrical energy is produced by oxidation and reduction reactions when lithium ions are intercalated/deintercalated at the positive and negative electrodes
Data Source
AI summary
A rechargeable lithium battery is provided. The rechargeable lithium battery includes a positive electrode active material; a negative electrode including a negative electrode active material; an electrolyte solution for a rechargeable lithium battery including a non-aqueous organic solvent, a lithium salt, and an additive, wherein the additive includes a first compound represented by Chemical Formula 1 and a second compound represented by Chemical Formula 2, and the positive electrode active material includes lithium nickel composite oxide represented by Chemical Formula 3.