Lithium (n-carbonyl)sulfonamide compound, additive for lithium secondary battery, non-aqueous electrolyte for lithium secondary battery, lithium secondary battery precursor, lithium secondary battery, and method for producing lithium secondary battery
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Solution Overview
Problem
Lithium secondary batteries with lithium trifluoromethylcarbonyl trifluoromethyl sulfonamide in nonaqueous solvents experience increased direct-current resistance and decreased discharge capacity when stored in high-temperature environments.
Innovation Solution
A lithium (N-carbonyl)sulfonamide compound represented by Formula (I) is added to the nonaqueous electrolyte solution, which forms a solid electrolyte interphase (SEI) film on the electrodes, stabilizing the battery and preventing side reactions that cause resistance and capacity loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If lithium trifluoromethylcarbonyl trifluoromethyl sulfonamide is added to nonaqueous solvent, then battery energy density is improved, but direct-current resistance increases and discharge capacity decreases in high-temperature environments
Solution Approach 1:
The patent modifies the chemical structure of the sulfonamide compound by replacing fluorine atoms with other substituents (such as hydrogen, alkyl groups, or aryl groups) to create a series of derivatives. This parameter change in molecular structure allows optimization of thermal stability while maintaining the desired electrochemical performance, thereby resolving the contradiction between energy density and high-temperature stability.
Solution Approach 2:
The patent combines lithium (N-carbonyl)sulfonamide compounds with specific nonaqueous solvents and other electrolyte additives to create a composite electrolyte system. This composite approach allows the different components to work synergistically, where the sulfonamide compound provides high energy density while the solvent system and additives compensate for thermal instability, achieving both high energy density and reliable performance in high-temperature environments.
2Ease of manufacture
If conventional electrolyte additives are used, then battery manufacturing is simplified, but side reactions occur that cause resistance increase and capacity loss
Solution Approach 1:
The patent converts the potential harm of side reactions into a benefit by designing sulfonamide compounds that undergo controlled decomposition at high temperatures to form stable protective films on electrode surfaces. These films, formed through what would otherwise be harmful side reactions, actually prevent further detrimental reactions and capacity loss, thus converting the harmful effect into a protective mechanism that maintains battery performance.
Solution Approach 2:
The lithium (N-carbonyl)sulfonamide compounds act as intermediary substances between the electrolyte and electrode surfaces. They form intermediate protective layers (SEI films) that mediate the interaction between the electrolyte and electrodes, preventing direct harmful reactions while allowing beneficial ionic transport. This intermediary function simplifies manufacturing by eliminating the need for complex multi-component additive systems while effectively suppressing side reactions.
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 lithium (N-carbonyl)sulfonamide compound inhibits the increase in direct-current resistance and decrease in discharge capacity of lithium secondary batteries even in high-temperature environments by forming a stable SEI film, ensuring battery durability and performance.
Implementation Method 1
which forms a solid electrolyte interphase (SEI) film on the electrodes, stabilizing the battery and preventing side reactions that cause resistance and capacity loss
Data Source
AI summary
Provided is a lithium (N-carbonyl)sulfonamide compound represented by the following Formula (I). In Formula (I), R1 and R2 each represent an alkyl group having from 1 to 10 carbon atoms, an alkenyl group having from 2 to 10 carbon atoms, an alkynyl group having from 2 to 10 carbon atoms, or an aryl group, and L1 and L2 each represent a single bond or —O—, with a proviso that a case in which L1 and L2 are both single bonds are excluded.