Phosphorus Borate Electrolyte for Lithium Battery Resistance
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Solution Overview
Problem
Lithium secondary batteries face challenges in improving initial resistance characteristics, with existing solutions not adequately addressing the issue, and there is a lack of investigation into the application of phosphorus-element-containing borate compounds in battery technology.
Innovation Solution
A non-aqueous electrolyte solution and polyelectrolyte containing a specific compound represented by formula (1) are developed, which includes phosphorus atoms and alkali metal atoms, improving the initial resistance characteristics of lithium secondary batteries by forming a film on the negative electrode that reduces reductive decomposition reactions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional non-aqueous electrolyte solutions are used, then the battery can operate, but the initial resistance characteristic is not improved
Solution Approach 1:
The invention changes the chemical composition parameters of the electrolyte solution by introducing a specific phosphorus-element-containing borate compound with defined molecular structure (formula 1), where the sum of n, m, and l is 1 to 200. This parameter change in composition directly improves the initial resistance characteristic without complicating the manufacturing process
Solution Approach 2:
The invention creates a composite electrolyte system by combining the phosphorus-element-containing borate compound (formula 1) with conventional electrolyte components (lithium salt and non-aqueous solvent). This composite approach leverages the beneficial effects of the novel compound while maintaining the functional properties of the conventional electrolyte solution
2Reliability
If phosphorus-element-containing borate compound is added to improve initial resistance, then reductive decomposition reactions are suppressed, but the device complexity increases
Solution Approach 1:
The invention applies local quality by concentrating the functional improvement in a specific molecular structure (formula 1) with controlled parameters (n, m, l sum). The compound's specific structural characteristics (phosphorus atoms at positions A, alkali metal atoms at positions M) provide localized functional enhancement at the molecular level, suppressing reductive decomposition reactions specifically where needed at the electrode interface
Solution Approach 2:
The invention uses partial action by incorporating the phosphorus-element-containing borate compound at optimized concentrations (0.01-10% by mass, preferably 0.05-5% by mass). This partial incorporation is sufficient to suppress reductive decomposition reactions and improve initial resistance without requiring complete replacement of the conventional electrolyte system, thus avoiding excessive complexity
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 effectively enhances the initial resistance and lifespan performance of lithium secondary batteries by suppressing reductive decomposition reactions and deterioration, thereby improving battery efficiency and energy density.
Implementation Method 1
improving the initial resistance characteristics of lithium secondary batteries by forming a film on the negative electrode that reduces reductive decomposition reactions
Implementation Method 2
reduces reductive decomposition reactions
Implementation Method 3
a positive electrode and a negative electrode, which contain materials capable of absorption and desorption of lithium
Implementation Method 4
materials capable of absorption and desorption of lithium
Data Source
AI summary
A non-aqueous electrolyte solution for a battery, including a compound represented by formula (1), wherein each A represents P or P═O; each R represents H, a halogen, an alkyl, an aryl, an alkoxy or an aryloxy; each X represents H, an alkyl, an aryl, an alkali metal or formula (2); each Y represents H, a halogen, an alkyl, an aryl, an alkoxy, an aryloxy or formula (3); each Z represents H, an alkyl, an aryl or OZ1; Z1 represents H, an alkyl, an aryl, an alkali metal, formula (2), or formula (4); each M represents an alkali metal; n is 1 or more; m is 1 or more; l is 1 or more; a sum of n, m and l in one molecule is from 1 to 200; and each * represents a position of bonding: