Secondary Battery Electrolyte Additives for Stable Metal Anode Interfaces
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Solution Overview
Problem
Existing electrolytes for secondary batteries undergo side reactions with metal negative electrodes, leading to instability in chemical and electrochemical properties, and result in poor cycling performance, storage stability, and safety.
Innovation Solution
An electrolyte is developed by adding one or more of an ionic liquid additive, an amide compound additive, an inert cation additive, and an alloy additive to an ester solvent, enhancing the chemical and electrochemical stability, and improving the interface stability, cycling performance, and storage stability of secondary batteries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing electrolyte is used, then ion transport function is provided, but chemical and electrochemical stability deteriorates due to side reactions with metal negative electrode
Solution Approach 1:
The patent introduces a coating layer as an intermediary substance between the metal negative electrode and the electrolyte. This coating layer acts as a mediator that prevents direct contact and side reactions between the electrolyte and the metal negative electrode, while still allowing ion transport. The coating layer effectively isolates the two components that would otherwise react harmfully with each other.
Solution Approach 2:
The patent creates an inert environment by forming a stable coating layer on the metal negative electrode surface. This coating layer provides an inert interface that prevents the electrolyte from reacting with the metal negative electrode, similar to how an inert atmosphere prevents chemical reactions. The coating layer establishes a chemically stable environment at the electrode-electrolyte interface.
2Duration of action of moving object
If existing electrolyte is used, then basic ion conduction is achieved, but cycling performance deteriorates due to interface instability
Solution Approach 1:
The patent applies preliminary action by pre-forming a stable coating layer on the metal negative electrode before the battery undergoes cycling operations. This pre-established coating layer prevents interface instability from developing during cycling, thereby improving cycling performance. The coating layer is prepared in advance to avoid the problems of interface degradation that would occur during repeated charge-discharge cycles.
3Reliability
If existing electrolyte is used, then battery operation is enabled, but storage stability deteriorates due to chemical reactions
Solution Approach 1:
The coating layer serves as a protective intermediary that prevents chemical reactions between the electrolyte and the metal negative electrode during storage. This intermediary layer maintains the stability of the battery system during storage by blocking direct chemical contact between reactive components, thereby improving storage stability.
4Object-affected harmful factors
If existing electrolyte is used, then ion transport between electrodes is provided, but safety deteriorates due to gas production
Solution Approach 1:
The patent extracts and removes the harmful gas production side effect by introducing the coating layer that prevents the chemical reactions responsible for gas generation. The coating layer selectively allows ion transport while blocking the parasitic reactions that produce gas, effectively extracting the harmful effect from the system while maintaining the desired ion conduction function.
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 proposed electrolyte significantly improves the interface stability, cycling performance, and storage stability of secondary batteries, while also enhancing safety by reducing gas production and improving overall safety.
Implementation Method 1
the ionic liquid additive can be used to form a solid electrolyte interface (SEI) film at a negative electrode, so that direct reactions between the negative electrode and ester solvent molecules or free radicals can be reduced
Implementation Method 2
An electrolyte is a carrier for ion transport in a battery and conducts ions between positive and negative electrodes of the battery
Data Source
AI summary
An electrolyte for secondary battery, a secondary battery including the electrolyte, a battery module including the secondary battery, a battery pack including the secondary battery, and an electric apparatus including the secondary battery. The electrolyte for secondary battery includes an ester solvent and an additive, where the additive includes one or more of an ionic liquid additive, an amide compound additive, an inert cation additive, and an alloy additive.