Secondary Battery Electrolyte Additives for Low-Resistance Stable Films
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Solution Overview
Problem
Existing lithium secondary batteries face challenges in improving output characteristics, high-temperature storage characteristics, and reducing gas generation and thickness increase rates due to electrolyte additives that either do not function effectively or are used in improper amounts, leading to decomposition and deterioration of electrode surfaces.
Innovation Solution
An electrolyte comprising specific additives with symmetrical structures and electronegative atomic groups, along with a lithium salt and organic solvent, forms a stable film on electrodes, reducing discharge resistance and suppressing gas generation, thereby enhancing battery performance and lifespan.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electrolyte additives are used to improve output characteristics and high temperature storage characteristics, then battery performance is improved, but gas generation and thickness increase rate worsen
Solution Approach 1:
The patent changes the chemical parameters of the electrolyte additive by specifying a particular molecular structure with a nitrogen-containing six-membered ring and specific substituents. This structural parameter change enables the additive to form a stable SEI film that improves battery performance while suppressing gas generation during charging and discharging cycles.
Solution Approach 2:
The patent creates a composite electrolyte system by combining the specific electrolyte additive (with nitrogen-containing ring structure) with lithium salt and organic solvent. This composite material approach allows the additive to work synergistically with other electrolyte components to achieve both improved output characteristics and reduced gas generation.
2Power
If electrolyte additives are used to improve output characteristics, then discharge resistance is reduced, but decomposition of positive electrode surface occurs
Solution Approach 1:
The electrolyte additive performs preliminary action by forming a protective SEI film on the electrode surface before the battery undergoes charging and discharging cycles. This pre-formed stable film prevents subsequent decomposition of the positive electrode surface during high-rate discharge operations, allowing improved output characteristics without electrode degradation.
Solution Approach 2:
The electrolyte additive acts as an intermediary between the electrolyte and the electrode surface. It forms a stable interface layer that mediates the interaction between the electrolyte components and the electrode, preventing direct contact and decomposition reactions while still allowing lithium ion transport for improved power output.
3Quantity of substance
If electrolyte additives are used in insufficient amounts, then cost is reduced, but cycle characteristics and storage stability deteriorate
Solution Approach 1:
The patent optimizes the concentration parameter of the electrolyte additive to achieve effective performance at lower amounts. By changing the molecular structure to include the nitrogen-containing six-membered ring with specific electronegative substituents, the additive achieves higher efficiency per unit mass, allowing reduced additive quantity while maintaining excellent cycle characteristics and storage stability.
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 additives improve battery output, high-temperature recovery capacity, and extend lifespan by forming a stable film that prevents electrolyte decomposition and electrode collapse, resulting in reduced resistance and gas generation.
Implementation Method 1
improve low-temperature output characteristics due to the formation of a non-uniform SEI film
Implementation Method 2
forms a stable film on electrodes, reducing discharge resistance and suppressing gas generation
Implementation Method 3
Lithium secondary batteries enable smooth movement of lithium ions by inserting an electrolyte between the positive and negative electrodes, and electricity is generated or consumed through oxidation-reduction reactions due to intercalation and de-intercalation at the positive and negative electrodes.
Implementation Method 4
Lithium secondary batteries enable smooth movement of lithium ions by inserting an electrolyte between the positive and negative electrodes, and electricity is generated or consumed through oxidation-reduction reactions due to intercalation and de-intercalation at the positive and negative electrodes.
Implementation Method 5
electricity is generated or consumed through oxidation-reduction reactions due to intercalation and de-intercalation at the positive and negative electrodes
Implementation Method 6
prevents electrolyte decomposition and electrode collapse, resulting in reduced resistance and gas generation
Data Source
AI summary
Disclosed is an electrolyte and a secondary battery containing the same. According to the present disclosure, charging efficiency and output may be improved due to low discharge resistance, and gas generation and thickness increase may be suppressed to provide a secondary battery with long-term lifespan and excellent high temperature capacity retention.