Boron Electrolyte Additive for High-Temperature SEI Stability
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Solution Overview
Problem
Lithium secondary batteries face challenges in maintaining high thermal and chemical stability, particularly in high-temperature environments, which can lead to side reactions and potential ignition or explosion, necessitating the development of an electrolyte that suppresses these reactions and ensures battery safety and longevity.
Innovation Solution
A novel boron-containing compound is introduced as an electrolyte additive, which forms a thermally stable solid electrolyte interphase (SEI) on the electrode surface, preventing direct contact and suppressing decomposition, thereby enhancing the battery's high-temperature storage characteristics and thermal stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional electrolytes are used in lithium secondary batteries, then the batteries can operate with basic ion conductivity, but they exhibit poor thermal stability and undergo side reactions in high-temperature environments leading to safety issues
Solution Approach 1:
The boron-containing compound acts as an intermediary substance that mediates between the electrode and the conventional electrolyte. It forms a protective SEI layer on the electrode surface that prevents direct contact between the electrolyte and electrode, thereby suppressing side reactions while maintaining ion conductivity. This intermediary layer resolves the contradiction by allowing beneficial ion transport while blocking harmful chemical reactions at high temperatures.
Solution Approach 2:
The invention changes the chemical composition parameters of the electrolyte system by introducing a boron-containing compound with specific molecular structure (Formula 1) containing B-O-C bonds. This parameter change modifies the properties of the SEI layer formed on the electrode, resulting in enhanced thermal stability and suppressed side reactions while maintaining adequate ion conductivity for battery operation.
2Reliability
If the electrolyte is designed to suppress side reactions through stable SEI formation, then thermal stability improves, but ion conductivity may be compromised
Solution Approach 1:
The boron-containing compound modifies the SEI layer composition and structure parameters to achieve optimal balance. The specific molecular structure with B-O-C bonds and adjustable substituents (X1, X2, Y, n, m, x, y) allows tuning of the SEI properties to simultaneously provide thermal stability and maintain ion transport pathways, resolving the trade-off between stability and conductivity.
Solution Approach 2:
The electrolyte system becomes a composite consisting of conventional electrolyte components plus the boron-containing compound. This composite electrolyte formulation creates a multi-component SEI layer that combines the protective properties needed for thermal stability with the conductive properties needed for ion transport, achieving both requirements simultaneously.
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 effectively suppresses side reactions and improves the battery's lifespan by forming a protective layer, ensuring excellent high-temperature stability and ion conductivity, thus enhancing the battery's performance and safety.
Implementation Method 1
forms a thermally stable solid electrolyte interphase (SEI) on the electrode surface
Implementation Method 2
suppressing decomposition, thereby enhancing the battery's high-temperature storage characteristics and thermal stability
Data Source
AI summary
The present disclosure relates to a novel boron-containing compound and an electrolyte additive for a secondary battery containing the same. An electrolyte for a secondary battery provided in one embodiment contains the novel boron-containing compound, such that decomposition of the electrolyte may be suppressed, thereby improving a capacity and a lifespan of the battery.