Secondary Battery Electrolyte Coating for High-Temperature Cycle Stability
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Solution Overview
Problem
Secondary batteries face stability and capacity degradation due to side reactions between active material particles and electrolytes, leading to mechanical and chemical damage, especially during repeated charging and discharging.
Innovation Solution
An electrolyte solution for secondary batteries 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 suppressing contact with cathode active material, thereby preventing capacity reduction and enhancing high-temperature storage properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the active material composition or structure is modified to improve stability, then the stability of active material particles is improved, but the conductivity is lowered causing degradation of battery power
Solution Approach 1:
The patent introduces a coating layer as an intermediary substance between the active material particles and the electrolyte. This coating layer mediates the interaction by providing chemical stability while maintaining electrical conductivity, thus resolving the contradiction between stability and power. The coating acts as a buffer that prevents direct harmful contact while allowing beneficial charge transfer.
Solution Approach 2:
The patent employs composite material structure by combining the active material with a coating material to form a core-shell or composite particle structure. This composite approach allows the inner core to provide stability while the outer coating maintains conductivity, thereby achieving both stability and power simultaneously rather than having to compromise one for the other.
2Duration of action of moving object
If repeated charging and discharging is performed, then the battery capacity increases through cycling, but side reactions occur causing mechanical and chemical damage to particles
Solution Approach 1:
The patent applies preliminary action by forming a protective coating layer on the active material particles before they undergo repeated charging and discharging cycles. This pre-formed coating serves as a protective barrier that prevents mechanical and chemical damage during subsequent cycling operations, allowing the battery to endure more cycles without degradation.
Solution Approach 2:
The coating layer acts as a cushioning layer that absorbs and mitigates the mechanical and chemical stress generated during repeated charging and discharging. This beforehand cushioning protects the active material particles from cracking and degradation, maintaining reliability over extended cycling periods.
3Use of energy by moving object
If the active material is exposed to electrolyte to enable charge transfer, then electrochemical activity is maintained, but side reactions occur causing capacity degradation
Solution Approach 1:
The patent applies local quality by creating a coating layer with specific local properties at the surface of active material particles. The coating has different characteristics from the bulk material - it is designed to be impermeable to electrolyte while maintaining electrical conductivity. This local modification allows the interior to maintain electrochemical activity while the surface prevents side reactions with electrolyte.
Solution Approach 2:
The coating layer serves as an intermediary that facilitates controlled interaction between the active material and electrolyte. It allows beneficial charge transfer while blocking harmful side reactions, thus maintaining energy efficiency by preventing capacity degradation through unwanted reactions.
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 and capacity properties, maintains battery capacity during repeated charging and discharging, and extends the battery's lifespan by forming a protective coating layer that reduces volume change and side reactions.
Implementation Method 1
a silatane-based compound... which forms a coating layer on the anode active material
Implementation Method 2
suppressing contact with cathode active material, thereby preventing capacity reduction
Data Source
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.