Boron Electrolyte Additive for Stable Li-Ion Battery Interphases
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Solution Overview
Problem
Lithium secondary batteries face challenges in achieving high thermal and chemical stability, which is crucial for preventing ignition or explosion, especially as demand increases for batteries with high power and capacity for applications like automobiles.
Innovation Solution
A novel boron-containing compound is introduced as an electrolyte solution additive, which forms a thermally stable solid electrolyte interphase on the electrode surface, suppressing side reactions and improving battery life by preventing electrolyte decomposition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If conventional electrolyte solutions are used to achieve high power and capacity, then battery performance is improved, but thermal stability deteriorates leading to ignition or explosion risks
Solution Approach 1:
The boron-containing compound acts as an intermediary substance between the electrode and the conventional electrolyte solution. It forms a protective solid electrolyte interphase layer that mediates the interaction, allowing high power performance while preventing direct harmful reactions that cause thermal instability and ignition risks
Solution Approach 2:
The invention creates a composite structure by combining the boron-containing compound with conventional electrolyte components. The resulting solid electrolyte interphase layer is a composite material that integrates the beneficial electrical properties needed for high power with the thermal stability required for safety
2Quantity of substance
If electrolyte solution composition is optimized for high capacity, then battery capacity is improved, but chemical stability deteriorates
Solution Approach 1:
The boron-containing compound serves as a chemical intermediary that forms a stable protective layer on the electrode surface. This layer allows optimized electrolyte compositions for high capacity while preventing direct chemical reactions that would otherwise compromise stability
3Power
If operating temperature is increased to maintain performance, then battery performance is maintained, but electrolyte decomposition accelerates
Solution Approach 1:
The boron-containing compound changes the thermal parameters of the electrolyte system by forming a thermally stable solid electrolyte interphase layer. This layer allows the battery to operate at higher temperatures for maintained performance while the protective layer prevents electrolyte decomposition that would otherwise occur, thereby extending battery life
Solution Approach 2:
The solid electrolyte interphase layer acts as a thermal intermediary that protects the bulk electrolyte from decomposition at elevated operating temperatures, enabling performance maintenance without accelerating degradation
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 boron-containing compound enhances the thermal stability and ion conductivity of the electrolyte solution, leading to improved storage characteristics and extended battery life, even at high temperatures, while maintaining low resistance and efficient performance.
Implementation Method 1
forms a thermally stable solid electrolyte interphase on the electrode surface
Implementation Method 2
enhances the thermal stability and ion conductivity of the electrolyte solution
Data Source
AI summary
Provided are a novel boron-containing compound and an electrolyte solution additive for a secondary battery including the same. The electrolyte solution for a secondary battery provided in one embodiment includes the novel boron-containing compound, thereby suppressing the decomposition of an electrolyte solution to improve the capacity and the life characteristics of a battery.