Non-Aqueous Electrolyte Additive for High-Temperature Lithium Batteries
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Solution Overview
Problem
The dissolution of transition metals from the positive electrode and their redeposition on the negative electrode in lithium secondary batteries leads to increased resistance, self-discharge, and capacity degradation, posing safety risks due to dendrite formation.
Innovation Solution
A non-aqueous electrolyte solution for lithium secondary batteries containing a compound represented by Formula 1, which forms a robust film on the positive electrode and scavenges decomposition products, suppressing transition metal dissolution and electrodeposition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a lithium secondary battery uses a conventional electrolyte solution without special additives, then the battery structure is simple and manufacturing is easy, but transition metal dissolves from the positive electrode and deposits on the negative electrode, causing increased resistance, self-discharge, and capacity degradation
Solution Approach 1:
The patent introduces a fluorinated cyclic carbonate compound as an intermediary additive in the electrolyte solution. This compound acts as a mediator that preferentially reacts with transition metals and their decomposition products, forming a protective interface layer that prevents direct contact between the metal ions and electrode surfaces, thereby suppressing dissolution and unwanted deposition while maintaining overall system simplicity
Solution Approach 2:
The patent extracts and addresses the specific problem of transition metal dissolution by adding a targeted functional additive (fluorinated cyclic carbonate compound) to the electrolyte solution. This additive specifically binds to and removes transition metal ions from the electrolyte environment, preventing their harmful deposition on the negative electrode while maintaining the simplicity of the overall battery structure
2Power
If the battery operates at high temperature, then the battery can deliver higher power and energy, but the electrolyte solution decomposes and the positive electrode film degrades, leading to transition metal dissolution and reduced battery performance
Solution Approach 1:
The patent applies preliminary anti-action by incorporating a fluorinated cyclic carbonate compound that proactively prevents electrolyte decomposition and film degradation before they occur. This additive creates a stable protective layer on the positive electrode surface that resists thermal degradation, preventing transition metal dissolution and maintaining electrolyte stability even at elevated operating temperatures
Solution Approach 2:
The patent utilizes parameter changes by introducing a fluorinated cyclic carbonate compound with specific molecular characteristics (fluorine substitution and cyclic carbonate structure) that alter the chemical stability parameters of the electrolyte system. This additive changes the decomposition temperature and stability characteristics of the electrolyte-film interface, enabling the battery to maintain performance at higher temperatures without compromising composition stability
3Productivity
If transition metal is dissolved in the electrolyte solution, then the battery can be charged and discharged, but the metal is re-deposited on the positive electrode increasing resistance and electrodeposited on the negative electrode causing self-discharge and SEI destruction
Solution Approach 1:
The patent converts the harmful effect of transition metal dissolution into a beneficial outcome by using the fluorinated cyclic carbonate compound to capture and immobilize the dissolved metal ions. Instead of allowing free movement and harmful deposition of metal ions, the additive transforms them into stable complexes within the electrolyte, preventing both positive electrode resistance increase and negative electrode self-discharge while maintaining charge-discharge functionality
4Quantity of substance
If metal ions electrodeposit on the negative electrode and grow as dendrites, then the battery shows high capacity, but internal short-circuit occurs leading to safety issues
Solution Approach 1:
The fluorinated cyclic carbonate compound acts as an intermediary that interferes with the dendrite formation process. It modifies the deposition behavior of lithium ions and transition metals on the negative electrode surface, creating a more uniform deposition pattern that prevents dendritic growth while maintaining high lithium ion capacity and ensuring battery safety
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 solution improves high-temperature storage and cycle characteristics by preventing film degradation and electrolyte decomposition, maintaining lithium ion availability and enhancing battery safety.
Implementation Method 1
a first additive, wherein the first additive includes a compound represented by Formula 1... forming a robust film on a surface of a positive electrode
Implementation Method 2
suppressing dissolution of transition metal from a positive electrode by forming a robust film on the positive electrode during oxidation
Implementation Method 3
simultaneously scavenging a decomposition product caused by decomposition of an anion of a lithium salt
Implementation Method 4
a non-aqueous electrolyte solution for a lithium secondary battery which includes a lithium salt, an organic solvent
Data Source
AI summary
A non-aqueous electrolyte solution for a lithium secondary battery and a lithium secondary battery including the same are disclosed herein. In some embodiments, a non-aqueous electrolyte solution includes a lithium salt, an organic solvent, and a compound represented by Formula 1 as a first additive. A lithium secondary battery including the non-aqueous electrolyte has improved high-temperature storage characteristics.