Nonaqueous Electrolyte With Oxide Particles for Li-Ion Charge Efficiency
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Solution Overview
Problem
Existing nonaqueous electrolyte solutions in batteries do not effectively enhance charge and discharge efficiency.
Innovation Solution
A nonaqueous electrolyte solution comprising a nonaqueous solvent, an electrolyte, and insoluble oxide particles with a molar mass of 50 g/mol or more and an average particle diameter of 1 nm to 500 nm, ensuring fluidity and dispersibility, which affects the coordination environment of Li ions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If oxide particles are added to enhance charge and discharge efficiency, then battery efficiency improves, but electrolyte viscosity increases and fluidity deteriorates
Solution Approach 1:
The patent applies parameter changes by carefully controlling the particle size of oxide particles (1 nm to 500 nm average diameter) and selecting appropriate nonaqueous solvents to achieve optimal balance between charge-discharge efficiency and electrolyte fluidity. This resolves the contradiction by adjusting physical parameters rather than fundamentally changing the system.
Solution Approach 2:
The patent applies local quality by ensuring uniform dispersion of oxide particles throughout the electrolyte solution, creating localized regions of enhanced ionic conductivity while maintaining overall fluidity. The particles are distributed to provide beneficial effects at electrode interfaces without compromising bulk electrolyte flow properties.
2Reliability
If oxide particles are added to improve cycle characteristics, then battery stability improves, but manufacturing complexity increases
Solution Approach 1:
The patent applies composite materials by combining oxide particles with nonaqueous electrolyte solution to create a composite electrolyte system. This provides improved cycle characteristics through the stable SEI formation and electrode protection offered by the oxide particles, while the liquid composite nature maintains relatively simple manufacturing processes compared to solid electrolyte systems.
3Productivity
If small particle diameter oxide particles are used to reduce electrode surface resistance, then charge efficiency improves, but particle settling and aggregation increase
Solution Approach 1:
The patent applies parameter changes by optimizing the particle size range (1 nm to 500 nm average diameter) to achieve the right balance between surface area for charge efficiency and stability against settling. The lower limit of 1 nm prevents excessive aggregation while the upper limit of 500 nm ensures sufficient surface area for effective charge transfer.
Solution Approach 2:
The patent applies the intermediary principle by using nonaqueous solvents as a mediating medium that prevents direct aggregation of oxide particles. The solvent molecules act as spacers and stabilizers, maintaining particle dispersion while allowing sufficient contact with electrode surfaces for efficient charge transfer.
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
Enhances charge and discharge efficiency and cycle characteristics of batteries, with improved industrial productivity and reduced resistance at the positive electrode surface.
Implementation Method 1
a nonaqueous electrolyte solution comprising: a nonaqueous solvent; an electrolyte dissolved in the nonaqueous solvent; and particles of an oxide insoluble in the nonaqueous solvent
Data Source
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AI summary
A nonaqueous electrolyte solution according to the present disclosure includes a nonaqueous solvent, an electrolyte dissolved in the nonaqueous solvent, and particles of an oxide insoluble in the nonaqueous solvent. The nonaqueous electrolyte solution according to the present disclosure has fluidity at 25°C. A molar mass of the oxide is 50 g/mol or more. An average particle diameter of the particles of the oxide is 1 nm or more and 500 nm or less. A secondary battery 100 according to the present disclosure includes a positive electrode 5, a negative electrode 6, and the nonaqueous electrolyte solution according to the present disclosure.