Electrolyte Additive for High-Voltage Lithium Battery Stability
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Solution Overview
Problem
Rechargeable lithium batteries face challenges in maintaining stability and performance at high voltages, particularly in forming a stable passivation film on the positive electrode, which affects their cycle-life characteristics.
Innovation Solution
An additive for the electrolyte, represented by specific chemical formulas, is introduced to improve stability by forming a stable passivation film on the positive electrode, enhancing flame retardancy and cycle-life characteristics of the battery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional electrolytes are used in rechargeable lithium batteries, then the batteries can operate, but they fail to maintain stability and form stable passivation films at high voltages, leading to poor cycle-life characteristics
Solution Approach 1:
The patent modifies the chemical structure of the electrolyte additive by introducing specific functional groups ( fluorinated alkyl groups, cyclic structures with nitrogen or oxygen atoms) and adjusting molecular parameters such as chain length and ring size. These parameter changes enable the additive to form stable passivation films at high voltages (≥4.35V), simultaneously improving both reliability and cycle-life characteristics without sacrificing the other.
2Use of energy by moving object
If high voltage operation is implemented to increase energy density, then battery performance improves, but stability and passivation film formation deteriorate
Solution Approach 1:
The patent introduces a specifically designed additive compound as an intermediary substance in the electrolyte. This additive acts as a mediator that facilitates stable passivation film formation on the positive electrode even at high voltages. The additive's molecular structure (containing fluorinated groups, cyclic structures with heteroatoms) enables it to intermediate between the high voltage operation conditions and the electrode surface, allowing high energy density operation while maintaining passivation film 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 additive effectively improves the stability and cycle-life characteristics of rechargeable lithium batteries by forming a stable passivation film on the positive electrode, even at high voltage regions, thereby enhancing battery performance.
Implementation Method 1
the additive for an electrolyte forms a stable passivation film on a positive electrode
Implementation Method 2
A battery converts chemical energy generated from an electrochemical redox reaction of a chemical material in the battery into electrical energy
Data Source
AI summary
Disclosed are an additive for an electrolyte represented by the following Chemical Formula 1, and an electrolyte and a rechargeable lithium battery including the same:wherein R1 to R4 and n are the same as described in the detailed description.