Fluorinated Electrolyte Secondary Battery for Wide Temperature Operation
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Solution Overview
Problem
Lithium-ion secondary batteries face performance degradation at low temperatures and have shorter lifespans at high temperatures, necessitating a solution for stable operation across a wide temperature range while ensuring safety and high capacity.
Innovation Solution
A secondary battery design incorporating a negative electrode with a solvent containing fluorine, a current collector, and graphene, along with a solid electrolyte material, which includes a fluorine-containing electrolyte and active materials like silicon, tin, or gallium, to enhance safety, stability, and performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional lithium-ion secondary battery is used, then high capacity can be achieved, but the battery exhibits performance degradation at low temperatures and has shorter lifespan at high temperatures
Solution Approach 1:
The patent changes the chemical composition parameters of the electrolyte by incorporating fluorinated cyclic carbonates (FEC, DFEC, F3EC, or F4EC) at specific concentrations (5-100 vol%, preferably 20-50 vol%). This parameter modification enables the battery to maintain stable performance across a wide temperature range from -40°C to 150°C, resolving the temperature stability issue while preserving battery lifespan
Solution Approach 2:
The patent uses a composite electrolyte system combining fluorinated cyclic carbonate with other cyclic carbonate solvents (EC, PC, DEC, EMC, GVL, or DMSO). This composite approach creates synergistic effects where the fluorinated component provides low-temperature fluidity and high-temperature stability, while the other components contribute to overall electrolyte performance, achieving both reliability and extended lifespan
2Productivity
If the battery operates at high temperatures, then charging and discharging rate can be improved, but the lifetime becomes shorter and abnormalities may occur
Solution Approach 1:
The patent converts the potential harm of high temperature operation into a benefit by using fluorinated cyclic carbonates that are specifically stable at elevated temperatures. These compounds prevent thermal runaway and electrolyte decomposition that would normally occur at high temperatures, while still allowing fast charging and discharging rates. The fluorinated structure acts as a thermal stabilizer, enabling high productivity without compromising safety
Solution Approach 2:
The patent modifies the electrolyte's thermal stability parameters by introducing fluorinated cyclic carbonates with specific molecular structures and fluorine content. This parameter change raises the decomposition temperature of the electrolyte and stabilizes the SEI layer formation, allowing the battery to operate safely at high temperatures while maintaining high charging and discharging rates
3Loss of energy
If the battery operates at low temperatures, then energy conservation can be achieved, but the performance deteriorates significantly
Solution Approach 1:
The patent changes the viscosity and freezing point parameters of the electrolyte by incorporating fluorinated cyclic carbonates. These compounds have lower freezing points and reduced viscosity at low temperatures compared to conventional electrolytes, maintaining ionic conductivity even at -40°C. This enables the battery to deliver full performance in cold conditions while preserving energy through efficient operation
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 battery achieves stable operation from -40°C to 150°C, with improved safety and reduced deterioration, enabling reliable use in various temperature conditions.
Implementation Method 1
a secondary battery including a positive electrode and a negative electrode, wherein the negative electrode includes a solvent containing fluorine
Implementation Method 2
the negative electrode includes a solvent containing fluorine, a current collector, a negative electrode active material, and graphene
Implementation Method 3
the negative electrode preferably further includes a solid electrolyte material and the solid electrolyte material is preferably an oxide
Data Source
AI summary
A negative electrode with little degradation is provided. Alternatively, a novel negative electrode is provided. A secondary battery includes a positive electrode and a negative electrode, and the negative electrode includes a solvent containing fluorine, a current collector, a negative electrode active material, and graphene. The negative electrode further includes a solid electrolyte material and the solid electrolyte material is an oxide. The negative electrode active material may contain fluorine. The secondary battery may include a plurality of electrolytes different from each other. The negative electrode active material is, for example, a material containing one or more elements selected from silicon, tin, gallium, aluminum, germanium, lead, antimony, bismuth, silver, zinc, cadmium, and indium.