Li-Sn-O-S Hybrid Electrolyte for Battery Safety and Conductivity
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Solution Overview
Problem
Current lithium-ion batteries face safety concerns due to dendritic lithium and lack of flame retardancy in liquid and polymer electrolytes, necessitating the development of solid electrolytes for improved stability and discharge capacity, especially for electric vehicle applications.
Innovation Solution
A Li-Sn-O-S compound is developed, represented by formulas such as Li3x[LixSn1−x(O,S)2, embedded with lithium ions, used in a hybrid electrolyte with a gel polymer electrolyte, and manufactured through a process involving a Sn-O-S precursor and calcination, utilizing lithium sources like lithium nitrate and sulfur sources, to enhance ionic conductivity and safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If liquid electrolytes are used in lithium-ion batteries, then ionic conductivity and discharge capacity are improved, but safety and flame retardancy deteriorate due to spilled combustion and explosion risks
Solution Approach 1:
The patent changes the physical state of the electrolyte from liquid to solid by incorporating lithium ions into the Sn-O-S compound structure. This parameter change eliminates the combustion and explosion risks associated with liquid electrolytes while maintaining ionic conductivity through the solid-state lithium ion pathways in the compound structure.
Solution Approach 2:
The patent creates a composite solid electrolyte system by combining Li-Sn-O-S compound with gel polymer electrolyte. This composite structure integrates the high ionic conductivity of the inorganic Li-Sn-O-S compound with the flexibility and processability of the organic gel polymer matrix, achieving both safety and performance.
2Reliability
If polymer electrolytes are used to improve safety, then flame retardancy is improved, but ionic conductivity and discharge capacity deteriorate
Solution Approach 1:
The patent develops a composite gel polymer electrolyte system where inorganic Li-Sn-O-S compounds are embedded in an organic polymer matrix. The inorganic compound provides high ionic conductivity pathways for lithium ions, while the polymer matrix provides structural support and flame retardancy, achieving synergistic enhancement of both properties.
Solution Approach 2:
The patent creates local high-conductivity regions within the polymer electrolyte by distributing Li-Sn-O-S compound particles throughout the matrix. These localized inorganic phases serve as fast ion conduction channels, while the surrounding polymer matrix maintains safety properties, achieving spatial optimization of conductivity and safety.
3Reliability
If solid electrolytes are developed to improve safety and stability, then flame retardancy and stability are improved, but manufacturing complexity increases
Solution Approach 1:
The patent prepares Sn-O-S precursor compounds beforehand through controlled chemical reactions, which are then combined with lithium sources and subjected to simple calcination treatment. This preliminary preparation of precursors simplifies the overall manufacturing process by breaking down the synthesis into manageable stages with well-defined intermediate products.
Solution Approach 2:
The patent employs calcination treatment as a simple thermal processing step to convert the precursor materials into the final Li-Sn-O-S compound. This parameter-based approach (controlling temperature and time) provides a straightforward manufacturing method that avoids complex multi-step syntheses while achieving the desired product structure and composition.
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 Li-Sn-O-S hybrid electrolyte demonstrates improved lithium conductivity, stability, and flame-stopping capabilities, with ionic conductivities up to 1.17*10−4 Scm−1 and discharging capacity of 134.6 mAh/g, addressing safety and performance issues in lithium-ion batteries.
Implementation Method 1
the electrolytes allow current to be conducted in the form of ions in the batteries
Implementation Method 2
performing calcination on the Li—Sn—O—S precursor in a vulcanization condition
Data Source
AI summary
A Li—Sn—O—S compound, a manufacturing method therefor and use thereof as an electrolyte material of Li-ion batteries, and a Li—Sn—O—S hybrid electrolyte are provided. The Li—Sn—O—S compound of the present invention is laminated Sn—O—S embedded with lithium ions. The Li—Sn—O—S compound is represented by the formula Li3x[LixSn1−x(O,S)2], where x>0. The manufacturing method for a Li—Sn—O—S compound includes the following steps of: (S1000) providing a Sn—O—S compound; (S2000) adding a lithium source into the Sn—O—S compound to form a Li—Sn—O—S precursor; and (S3000) performing calcination on the Li—Sn—O—S precursor in a vulcanization condition.