Composite Battery Electrolyte for Leak and Ignition Resistance
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Solution Overview
Problem
Commercially available lithium secondary batteries face safety issues such as leakage, ignition, and explosion due to sudden environmental changes, and there is a need for improved mechanical properties and high-temperature stability in secondary battery electrolytes.
Innovation Solution
An electrolyte for a secondary battery comprising a lithium salt, a composite membrane made of a sintered inorganic electrolyte, and a flame retardant polymer, with a strength ranging from ASTM standard 2B to 5B, and porosity of 10% to 40%, which includes a phosphorus-containing functional group and fluorine atoms to enhance mechanical and electrochemical stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If liquid electrolytes are used in lithium secondary batteries, then high ionic conductivity is achieved, but safety issues such as leakage, ignition, and explosion occur due to sudden environmental changes
Solution Approach 1:
The patent changes the physical state of the electrolyte from liquid to solid by incorporating a solid electrolyte membrane, fundamentally altering the parameters of the electrolyte system to eliminate leakage and improve safety while maintaining ionic conductivity
Solution Approach 2:
The patent creates a composite electrolyte system combining a solid electrolyte membrane with flame retardant polymer and lithium salt, integrating multiple materials with complementary properties to achieve both safety and electrochemical performance
2Reliability
If solid-state electrolytes are used to enhance stability, then ignition and explosion resistance improve, but mechanical properties and high-temperature stability need improvement
Solution Approach 1:
The patent develops a composite structure where the solid electrolyte membrane is combined with flame retardant polymer and lithium salt, creating a composite material that simultaneously provides mechanical strength, thermal stability, and ionic conductivity
Solution Approach 2:
The patent applies flame retardant polymer specifically to the solid electrolyte membrane structure, concentrating fire-resistant properties where needed while maintaining the overall mechanical integrity of the electrolyte system
3Temperature
If flame retardant polymer is added to solid electrolyte membrane, then high-temperature stability and self-extinguishing properties improve, but the ratio of flame retardant polymer to inorganic electrolyte must be optimized
Solution Approach 1:
The patent optimizes the volume ratio parameter of flame retardant polymer to inorganic electrolyte (0.01 to 0.3), finding the optimal balance that achieves high-temperature stability and self-extinguishing properties while maintaining electrochemical performance
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 electrolyte exhibits improved mechanical properties, self-extinguishing properties, and high-temperature stability, enhancing safety and electrical characteristics of lithium secondary batteries.
Implementation Method 1
a composite membrane including a sintered body of an inorganic electrolyte
Implementation Method 2
a flame retardant polymer... self-extinguishing properties
Implementation Method 3
high-temperature stability, ignition stability and flame retardancy
Implementation Method 4
electrolyte for a secondary battery... lithium salt... electrochemical stability
Data Source
Figure 1~2
AI summary
An electrolyte for a secondary battery according to embodiments of the present disclosure may include a lithium salt, a composite membrane including an inorganic electrolyte, and a flame retardant polymer. A secondary battery according to embodiments of the present disclosure may include a cathode, an anode disposed to face the cathode, and an electrolyte layer disposed between the cathode and the anode which includes the electrolyte for a secondary battery.