Solid Electrolyte Composition With Halogenated Binder for Interface Stability
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Solution Overview
Problem
All-solid state secondary batteries face issues with interfacial contact states leading to increased interface resistance and deteriorated cycle characteristics due to restricted dispersibility of solid particles, and inorganic solid electrolytes are prone to deterioration from water, especially during manufacturing.
Innovation Solution
An inorganic solid electrolyte-containing composition with a polymer binder featuring a random polymer with a halogen atom directly connected to the main chain and non-aromatic carbon-carbon double bonds, which maintains dispersibility and prevents electrolyte deterioration, even at high solid content concentrations, forming a low-resistance constitutional layer with improved binding forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If solid particles are used to form constitutional layers in all-solid state secondary batteries, then safety and reliability are improved, but interfacial contact state is restricted leading to increased interface resistance
Solution Approach 1:
The patent introduces a polymer binder as an intermediary substance between solid particles (inorganic solid electrolyte and active materials). This binder fills the gaps between particles and improves interfacial contact, thereby reducing interface resistance while maintaining the safety benefits of solid particles. The binder acts as a mediator that enhances the contact state without compromising the solid-state structure.
Solution Approach 2:
The patent creates a composite material system combining solid particles (inorganic solid electrolyte and active materials) with a polymer binder. This composite approach allows the benefits of solid particles (safety, reliability) to be maintained while the binder component addresses the interfacial contact issue, reducing interface resistance through improved particle-to-particle and particle-to-current collector contact.
2Power
If non-aqueous electrolyte is used in secondary batteries, then battery performance is improved, but leakage and short circuit occur easily due to overcharging or overdischarging
Solution Approach 1:
The patent fundamentally changes the physical state parameter of the electrolyte from liquid (non-aqueous) to solid (inorganic solid electrolyte). This parameter change eliminates the leakage issue inherent in liquid electrolytes while maintaining ion conductivity. The solid-state electrolyte can withstand overcharging and overdischarging conditions without the short circuit problems that plague liquid electrolyte systems, thereby improving both safety and reliability while preserving battery performance.
3Productivity
If solid content concentration is increased in inorganic solid electrolyte-containing composition, then productivity is improved, but dispersibility of solid particles deteriorates
Solution Approach 1:
The polymer binder serves as a mediator between solid particles at high concentrations. It provides a matrix that maintains particle separation and prevents aggregation even when solid content concentration is increased for productivity benefits. The binder ensures that high solid content does not lead to poor dispersibility, allowing both high productivity and good compositional stability to be achieved simultaneously.
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 composition ensures excellent dispersibility and stability of solid particles, reducing interface resistance and enhancing cycle characteristics while preventing electrolyte degradation, resulting in a battery with improved conductivity and longevity.
Implementation Method 1
a polymer binder featuring a random polymer with a halogen atom directly connected to the main chain and non-aromatic carbon-carbon double bonds, which maintains dispersibility and prevents electrolyte deterioration
Implementation Method 2
excellent dispersibility and stability of solid particles
Implementation Method 3
an inorganic solid electrolyte having an ion conductivity of a metal belonging to Group 1 or Group 2 in the periodic table
Data Source
AI summary
There is provided an inorganic solid electrolyte-containing inorganic solid electrolyte-containing composition, a polymer binder, and a dispersion medium, where the polymer binder includes a polymer binder consisting of a random polymer that has a halogen atom directly connected to a main chain and has a content of non-aromatic carbon-carbon double bonds of 0.01 to 10 mmol/g. There are also provided a sheet for an all-solid state secondary battery and an all-solid state secondary battery, in which this inorganic solid electrolyte-containing composition is used, as well as manufacturing methods for a sheet for an all-solid state secondary battery, and an all-solid state secondary battery.