Electrolyte Stabilizing Nickel-Rich Battery Surface
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Solution Overview
Problem
Lithium secondary batteries with nickel-rich positive active materials face instability issues due to surface destabilization, leading to reduced high-temperature lifetime characteristics and increased resistance, necessitating an improvement in electrolyte stability.
Innovation Solution
An electrolyte composition including a specific compound represented by Formula 1, a lithium salt, and an organic solvent, with the compound having a strong affinity for Ni3+ on the positive electrode surface to prevent dissolution and stabilize the surface, combined with additives like vinylene carbonate and maleic anhydride to enhance stability and resistance suppression.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If nickel-rich positive active materials are used to achieve high capacity characteristics, then battery capacity is improved, but surface stability deteriorates leading to reduced high-temperature lifetime characteristics
Solution Approach 1:
The patent introduces a specific electrolyte compound (Formula 1) as an intermediary substance that mediates between the nickel-rich positive active material and the electrolyte environment. This compound selectively adsorbs onto the material surface, forming a protective interface layer that prevents direct harmful interactions while maintaining electrochemical functionality, thereby improving high-temperature stability without sacrificing capacity.
Solution Approach 2:
The patent modifies the electrolyte composition by incorporating a specific compound (Formula 1) with controlled concentration (0.1-5 wt%). This parameter change in the electrolyte system alters the interfacial chemistry at the positive electrode, creating a more stable surface environment that suppresses degradation reactions at elevated temperatures while preserving the high-capacity characteristics of nickel-rich materials.
2Quantity of substance
If nickel-rich positive active materials are used to achieve high capacity characteristics, then battery capacity is improved, but surface stability deteriorates leading to increased resistance
Solution Approach 1:
The electrolyte compound (Formula 1) acts as an intermediary that forms a protective interface layer on the nickel-rich material surface. This intermediate layer prevents direct contact between the material and destabilizing electrolyte components, thereby suppressing resistance increase while maintaining high capacity.
Solution Approach 2:
The patent applies preliminary anti-action by introducing the electrolyte compound that preemptively stabilizes the material surface before degradation can occur. This preventive approach counteracts the tendency toward surface destabilization and resistance increase, allowing the battery to maintain low resistance throughout its operational life.
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 effectively stabilizes the nickel-rich lithium-nickel composite oxide surface, improving high-temperature lifetime characteristics and reducing internal resistance in lithium secondary batteries, thereby enhancing their performance and lifespan.
Implementation Method 1
having a strong affinity for Ni3+ on the positive electrode surface to prevent dissolution and stabilize the surface
Implementation Method 2
The electrolyte includes at least one selected from vinylene carbonate, vinyl ethylene carbonate, maleic anhydride, and succinic anhydride
Data Source
AI summary
An electrolyte for a lithium secondary battery, the electrolyte including: a compound represented by Formula 1; a lithium salt; and an organic solvent, wherein an amount of the compound represented by Formula 1 is less than about 3.0 weight percent, based on a total weight of the electrolyte:wherein, in Formula 1, R1 to R15 are each independently selected from hydrogen, fluorine, a C1-C10 alkyl group, and a C6-C10 aryl group.