Solid Electrolyte Composition to Suppress Low-Temperature Crystallization
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Solution Overview
Problem
Conventional solid electrolytes for all-solid-state batteries crystallize at low temperatures, leading to reduced ionic conductivity and deteriorated output characteristics.
Innovation Solution
A solid electrolyte composition comprising an amine-based compound, multifunctional isocyanate, and lithium salt, with specific weight ratios, forming a network structure that suppresses crystallization and enhances ionic conductivity and electrochemical stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional ion-conductive polymers (such as polyethylene oxide) are used to form solid electrolytes, then the electrolyte structure is simple and easy to manufacture, but the polymers crystallize easily at low temperatures, leading to low ionic conductivity and degraded output characteristics
Solution Approach 1:
The patent uses a composite material system consisting of polyethylene oxide polymer matrix combined with lithium salt (LiClO4) and plasticizer (EC/DMC). This composite structure prevents crystallization while maintaining ease of manufacture, resolving the contradiction between manufacturing simplicity and ionic conductivity reliability at low temperatures.
Solution Approach 2:
The patent changes the physical and chemical parameters of the electrolyte by adding plasticizers (EC/DMC) and optimizing the lithium salt content (10-30 wt%). This parameter modification suppresses crystallization temperature and maintains ionic conductivity at low temperatures, solving the reliability issue while keeping the manufacturing process simple.
2Ease of manufacture
If the polymer structure is simplified for easy manufacturing, then the production process becomes easier, but the low-temperature output characteristics and electrochemical stability deteriorate due to crystallization
Solution Approach 1:
The patent introduces plasticizers (EC/DMC) as intermediary substances that mediate between the polymer matrix and lithium ions. These intermediaries prevent crystallization and facilitate ion transport at low temperatures, maintaining productivity while preserving manufacturing simplicity.
Solution Approach 2:
By changing the compositional parameters (adding 10-30 wt% lithium salt and appropriate plasticizer content), the patent maintains simple manufacturing processes while significantly improving low-temperature output characteristics and electrochemical stability.
3Quantity of substance
If lithium metal is used as the anode to increase energy density, then the battery capacity increases, but lithium dendrite formation occurs during charge-discharge cycles, causing performance degradation
Solution Approach 1:
The solid electrolyte composition acts as an intermediary layer between the lithium metal anode and the rest of the battery. The plasticizer-enhanced polymer matrix prevents direct contact and dendrite formation while allowing efficient lithium ion transport, thus maintaining high energy density with improved performance stability.
4Reliability
If conventional liquid electrolytes are used, then the battery has good ionic conductivity, but the flammability results in low battery stability
Solution Approach 1:
The patent changes the physical state parameter of the electrolyte from liquid to solid by using polyethylene oxide-based polymer electrolyte. This phase change eliminates flammability while the added plasticizer maintains ionic conductivity, simultaneously improving both reliability and safety.
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 solid electrolyte composition improves lithium-ion mobility, maintains high ionic conductivity, and ensures excellent electrochemical stability, enhancing battery output and safety, particularly at low temperatures.
Implementation Method 1
a solid electrolyte characterized by suppressed crystallization at low temperature
Implementation Method 2
improve lithium-ion mobility, maintains high ionic conductivity
Data Source
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AI summary
A solid electrolyte composition according to the present disclosure comprises an amine-based compound represented by the following Chemical Formula 1; a multifunctional isocyanate; and a lithium salt, wherein the content of the lithium salt is 40 to 80 parts by weight based on 100 parts by weight of the amine-based compound. [Chemical Formula 1] In Chemical Formula 1, L1 and L2 are each independently selected from one or more of a C1-C12 alkylene group or heteroalkylene group, a C3-C16 cycloalkylene group or cycloheteroalkylene group, a C6-C16 arylene group or heteroarylene group, and [Chemical Formula 2], wherein n is a natural number in the range of 1 to 5,000, and m is a natural number in the range of 1 to 200.