Electrolytic Solution Metal Salt Concentration Ionic Conductivity
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Solution Overview
Problem
Conventional electrolytic solutions for lithium ion secondary batteries face challenges in maintaining the dissolved state of metal salts at higher concentrations due to the interaction between solvents and metal salts, leading to issues with ionic conductivity and stability.
Innovation Solution
The development of an electrolytic solution with a specific organic solvent, such as linear carbonates, esters, or phosphoric esters, at a mole ratio of 1-8 relative to a metal salt, which coordinates with the metal salt to maintain its dissolved state and enhance ionic conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the concentration of metal salt in the electrolytic solution is increased to improve battery capacity, then the battery capacity increases, but the ionic conductivity decreases due to poor dissolution
Solution Approach 1:
The patent changes the chemical parameters of the solvent system by introducing specific co-solvents (cyclic carboxylic acid esters and/or cyclic sulfates) with defined molecular structures and ratios. This parameter change enables the metal salt to maintain high concentration while preserving ionic conductivity through improved solvation
2Quantity of substance
If the concentration of metal salt is increased to improve battery performance, then the energy density improves, but the stability of the electrolytic solution deteriorates
Solution Approach 1:
The patent creates a composite solvent system combining multiple components (cyclic carbonate, cyclic carboxylic acid ester, and/or cyclic sulfate) with specific functional characteristics. This composite structure provides both high metal salt solubility and solution stability through synergistic interactions among the different solvent components
3Quantity of substance
If conventional solvents are used to dissolve metal salt, then the electrolytic solution can be prepared, but the ionic conductivity is insufficient at high metal salt concentrations
Solution Approach 1:
The patent introduces cyclic carboxylic acid esters and cyclic sulfates as intermediary substances that mediate between the metal salt and the primary solvent (cyclic carbonate). These intermediaries facilitate better solvation of metal salt ions, maintaining ionic conductivity even at high concentrations where conventional solvents would fail
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
This configuration improves the ionic conductivity and stability of the electrolytic solution, allowing for higher metal salt concentrations, thereby enhancing the performance and capacity of lithium ion secondary batteries.
Implementation Method 1
a specific organic solvent... coordinates with the metal salt to maintain its dissolved state
Data Source
AI summary
An electrolytic solution containinga specific organic solvent at a mole ratio of 1-8 relative to a metal salt,the specific organic solvent being selected from a linear carbonate represented by general formula (1-1) below, an ester represented by general formula (1-2) below, and a phosphoric ester represented by general formula (1-3) below,the metal salt being a metal salt whose cation is an alkali metal, an alkaline earth metal, or aluminum and whose anion has a chemical structure including two or three types of elements selected from boron, carbon, oxygen, a halogen, phosphorus, and arsenic, whereinR10OCOOR11 general formula (1-1)R12COOR13 general formula (1-2)OP(OR14)(OR15)(OR16) general formula (1-3).