Silatane Electrolyte Additive for High-Temperature Li-Ion Battery Life
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Solution Overview
Problem
Secondary batteries, particularly lithium secondary batteries, face stability and capacity degradation due to side reactions between active material particles and electrolytes, leading to mechanical and chemical damage, which reduces their power and lifespan.
Innovation Solution
An electrolyte solution comprising a lithium salt, non-aqueous organic solvent, and a silatane-based compound, which forms a coating layer on the anode active material, reducing exposure to the electrolyte and preventing contact with cathode active material, thereby enhancing stability and capacity retention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the composition or structure of active material is modified to improve stability of active material particles, then stability is improved, but conductivity is lowered causing degradation of power of the secondary battery
Solution Approach 1:
The silatane-based compound acts as an intermediary substance that forms a coating layer between the active material particles and the electrolyte. This coating layer mediates the interaction by providing stability to the particles while maintaining conductivity, thus resolving the contradiction between stability and power.
Solution Approach 2:
The invention changes the chemical composition parameters by introducing a silatane-based compound with specific molecular structure (Formula 1) into the electrolyte system. This parameter change enables the formation of a coating layer that simultaneously improves particle stability and maintains conductivity, overcoming the traditional trade-off.
2Power
If active material particles are used without modification, then conductivity is maintained, but side reactions with electrolyte occur causing mechanical and chemical damage
Solution Approach 1:
The silatane-based compound serves as a protective intermediary that forms a coating layer on active material particles. This coating layer prevents direct contact between particles and electrolyte, eliminating side reactions while preserving the underlying conductivity of the active material.
Solution Approach 2:
The coating layer formed by the silatane-based compound provides preliminary protection against side reactions before they can occur. By pre-establishing this protective barrier, the system prevents mechanical and chemical damage that would otherwise degrade reliability.
3Productivity
If repeated charging and discharging occurs, then battery functionality is achieved, but side reactions and mechanical damage accumulate reducing lifespan
Solution Approach 1:
The silatane-based compound performs preliminary protective action by forming a stable coating layer on active material particles before repeated charging and discharging cycles begin. This pre-formed coating prevents cumulative damage, enabling the battery to maintain functionality over extended periods.
Solution Approach 2:
The coating layer acts as a durable intermediary that withstands repeated charging and discharging cycles. It mediates between the mechanical stresses of cycling and the active material particles, preventing damage accumulation and extending battery lifespan.
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 electrolyte solution improves storage properties, capacity retention, and lifespan of secondary batteries by forming a protective coating layer that suppresses side reactions and volume changes during charging and discharging, especially at high temperatures.
Implementation Method 1
a silatane-based compound contained in the electrolyte solution for a secondary battery may form a coating layer on a surface of an anode for a secondary battery
Implementation Method 2
a chemical bond may be formed between the silatane-based compound contained in the electrolyte solution and the anode active material
Data Source
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AI summary
An electrolyte solution for a lithium secondary battery according to embodiments of the present disclosure includes a lithium salt, a non-aqueous organic solvent, and a silatane-based having a specific chemical structure. A secondary battery includes the electrolyte solution for a lithium secondary battery. The secondary battery has improved high temperature storage properties and life-span properties.