Fluorinated Semi-Solid Electrolyte Precursor for Lower Battery DCIR
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Solution Overview
Problem
Semi-solid batteries face issues of high Direct Current Internal Resistance (DCIR) due to difficulties in controlling monomer polymerization degrees and residual initiators causing excessive interfacial side reactions, leading to unstable interfaces and high impedance, which hinder their practical application.
Innovation Solution
A semi-solid battery electrolyte precursor comprising a first polymer monomer with an acrylic acid or acrylate structure and a second polymer monomer with a fluorine-containing unsaturated structure, along with an initiator, is used for in-situ polymerization, forming a stable Solid Electrolyte Interphase (SEI) film that optimizes the electrode/electrolyte interface and reduces DCIR.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If in-situ polymerization is used to prepare semi-solid batteries, then safety performance and interfacial compatibility are improved, but DCIR increases due to uncontrolled polymerization degree and residual initiators
Solution Approach 1:
The patent changes the polymerization parameters by controlling temperature, time, and monomer concentration to achieve optimal polymerization degree. It also adjusts electrolyte composition parameters to minimize residual initiator content, thereby reducing DCIR while maintaining safety improvements from in-situ polymerization.
Solution Approach 2:
The patent uses composite electrolyte systems combining gel polymer electrolyte with liquid electrolyte components. This composite approach allows the gel structure to provide safety and interfacial compatibility while the liquid components maintain ionic conductivity, thus reducing DCIR despite the presence of polymerization residues.
2Productivity
If high-temperature curing is applied after injecting precursor solution, then polymerization is accelerated, but DCIR increases due to consumption of film-forming additives and excessive interfacial side reactions
Solution Approach 1:
The patent performs preliminary formation treatment before final curing to pre-establish the SEI film. This preliminary action ensures that film-forming additives are consumed during formation rather than during curing, preventing excessive interfacial side reactions and DCIR increase while still achieving complete polymerization.
Solution Approach 2:
The patent employs periodic polymerization treatment with multiple stages at different temperatures and durations. This periodic approach allows controlled polymerization progression, preventing runaway reactions and additive consumption that would increase DCIR, while still achieving complete polymerization for high productivity.
3Stability of the object's composition
If two-step injection process is used to reduce DCIR, then interface stability improves, but process complexity and time costs increase
Solution Approach 1:
The patent merges the precursor solution injection and monomer injection into a single step by pre-mixing all components before injection. This combining approach eliminates the complexity of two-step injection while maintaining interface stability through proper formulation of the mixed solution that controls polymerization kinetics.
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 resulting copolymer improves electrode/electrolyte stability, significantly reduces DCIR, and enhances battery performance, making the semi-solid battery feasible for large-scale applications with simplified and efficient production processes.
Implementation Method 1
The semi-solid battery electrolyte precursor includes a first polymer monomer, a second polymer monomer, and an initiator. The first polymer monomer is an acrylic acid monomer or an acrylate monomer. The second polymer monomer is a fluorine-containing unsaturated monomer.
Data Source
AI summary
A semi-solid battery electrolyte precursor, a semi-solid battery electrolyte, a semi-solid battery, and a preparation method of the semi-solid battery are provided. The semi-solid battery electrolyte precursor includes a first polymer monomer, a second polymer monomer, and an initiator. The first polymer monomer is an acrylic acid monomer or an acrylate monomer. The second polymer monomer is a fluorine-containing unsaturated monomer.