Sulfur-Free Electrolyte Additives for High-Temperature Li-Ion Batteries
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Solution Overview
Problem
Lithium-ion batteries face challenges in high-temperature storage performance and cycle performance due to the potential restriction of sulfur-containing compounds, necessitating the development of sulfur-free additives that can enhance these characteristics.
Innovation Solution
A non-aqueous electrolyte solution comprising a lithium salt, organic solvent, and specific additives A and B, where additive A is represented by a structural general formula and additive B is a boron-containing lithium salt, synergistically inhibiting electrolyte decomposition and gas generation, thereby improving high-temperature storage and cycle performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sulfur-containing compounds are used as additives in electrolyte solutions, then high-temperature storage performance and cycle performance are improved, but the risk of future restrictions and bans increases due to SVHC list inclusion
Solution Approach 1:
The patent extracts and removes sulfur-containing compounds from the electrolyte solution formulation. Specifically, it eliminates 1,3-propanesultone and other sulfur-containing additives that are included in the SVHC list, replacing them with sulfur-free alternatives to avoid future regulatory restrictions while maintaining battery performance.
Solution Approach 2:
The patent changes the chemical composition parameters of the electrolyte solution by substituting sulfur-containing compounds with sulfur-free compounds. The additive composition is modified to use compounds with different chemical structures that do not contain sulfur, thereby changing the chemical parameters while maintaining or improving performance.
2Ease of manufacture
If conventional electrolyte solutions are used, then manufacturing simplicity is maintained, but decomposition occurs at high temperature leading to gas generation and reduced safety
Solution Approach 1:
The patent introduces specific additives as intermediary substances that mediate between the electrolyte components and prevent harmful decomposition reactions. The additives including compound (1) and boron-containing lithium salt act as intermediaries that suppress decomposition reactions and gas generation at high temperatures while maintaining electrolyte functionality.
Solution Approach 2:
The patent creates a composite electrolyte solution system by combining multiple components: lithium salts, cyclic carbonates, chain carbonates, and specific additives including compound (1) and boron-containing lithium salt. This composite formulation works synergistically to prevent decomposition while maintaining ease of manufacture.
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 effectively enhances the safety and performance of lithium-ion batteries by inhibiting decomposition and gas generation, providing improved high-temperature storage and cycle performance without the use of sulfur-containing compounds.
Implementation Method 1
Through the synergistic effect of the additive A and the additive B, the present disclosure can inhibit the decomposition of the electrolyte solution at high temperature, avoid gas generation
Implementation Method 2
using the electrode film-forming properties of sulfonyl groups to form a stable SEI film/protective film on the electrode surface, thereby suppressing gas generation
Data Source
AI summary
Embodiments described herein are directed to a non-aqueous electrolyte solution that may include a lithium salt, an organic solvent, and additives. The additives may include an additive A and an additive B. Additive A may be one or more of the substances represented by the structural general formulawhere 0≤n≤3, R1 may be selected from alkylene, alkyleneoxy, fluoroalkylene, fluoroalkyleneoxy, alkenylene or fluoroalkenylene, and R2 and R3 may be independently selected from hydrogen, phenyl, alkynyl, alkynyloxy, alkyl, alkoxy, fluoroalkyl, fluoroalkoxy, alkenyl or fluoroalkenyl. Additive B may be a boron-containing lithium salt.