Phosphorus-Silicon Electrolyte Additive for Low-Resistance Li-Ion Cells
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Solution Overview
Problem
Current lithium-ion secondary batteries face challenges in achieving low resistance and improved cycle characteristics, particularly for applications in automobiles, where high energy density and efficient performance are critical.
Innovation Solution
A novel compound represented by the formula (1) is introduced, which can be used as an additive in electrolyte solutions to reduce resistance and enhance cycle characteristics in electrochemical devices. This compound is synthesized through specific production methods involving reactions with fluorine-free lithium salt compounds and organic groups containing heteroatoms and unsaturated bonds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional electrolyte solutions are used, then basic battery function is maintained, but resistance is high and cycle characteristics are poor
Solution Approach 1:
The patent applies parameter changes by modifying the chemical composition of the electrolyte solution through the introduction of a specific compound with formula (1). This compound contains a phosphorus atom bonded to three silicon atoms, each with specific organic groups (C1-C6 alkyl, alkenyl, or aryl groups). The structural parameters and chemical properties of the electrolyte are changed to achieve both low resistance and improved cycle characteristics simultaneously.
Solution Approach 2:
The patent employs composite materials by creating a novel compound that combines phosphorus, silicon, and organic groups in a specific configuration. This composite molecular structure (formula (1)) integrates multiple functional elements: the phosphorus center, three silicon atoms with organic substituents, and specific bond arrangements. This composite structure provides both low resistance properties and enhanced cycle stability when used in the electrolyte solution.
2Use of energy by moving object
If high energy density is pursued for reduced weight and size, then battery capacity increases, but resistance and cycle stability become problematic
Solution Approach 1:
The patent changes the chemical parameters of the electrolyte by introducing compound (1) with specific molecular characteristics. The compound contains a phosphorus atom bonded to three silicon atoms, each carrying C1-C6 organic groups (alkyl, alkenyl, or aryl). This parameter change in electrolyte composition enables high energy density while maintaining reliable cycle characteristics, resolving the trade-off between capacity and stability.
Solution Approach 2:
The novel compound (1) acts as an intermediary substance in the electrolyte solution that mediates between the electrode and the bulk electrolyte. Its specific structure with phosphorus-silicon-organic group combinations facilitates efficient ion transport (reducing resistance) while forming stable interfacial layers that protect the electrode during cycling, thus enabling both high energy density utilization and long cycle life.
Data Source
AI summary
A compound represented by the following formula (1):wherein R101 to R103, each independently, are a C1-C6 organic group, optionally contain at least one selected from the group consisting of a hetero atom and an unsaturated bond, and are optionally linear, branched, or cyclic. Also disclosed is an electrolyte solution containing the compound, an electrochemical device containing the electrolyte solution, a lithium ion secondary battery containing the electrolyte solution and a module including the electrochemical device or the lithium ion secondary battery.