Binder Solution for All-Solid-State Batteries
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Solution Overview
Problem
All-solid-state batteries face limitations in energy density and output compared to conventional lithium ion batteries, and the addition of binders to electrodes can reduce uniformity and ion transmission in these batteries.
Innovation Solution
A binder solution comprising a polymer binder, a first solvent, and an ion-conductive additive, including lithium salt and a second solvent, is used to enhance binding and ion transmission in electrodes, allowing for larger electrodes and higher-temperature operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a binder is added to the electrode to provide binding force between components, then the binding strength is improved, but the uniformity of the electrode and ion transmission are reduced
Solution Approach 1:
The patent changes the chemical composition parameters of the binder solution by incorporating specific ratios of cyclic carbonate and chain carbonate solvents, along with lithium salt additives. This parameter optimization allows the binder to provide adequate binding strength while maintaining electrode uniformity and ion transmission pathways, resolving the contradiction between binding strength and uniformity
Solution Approach 2:
The patent uses a composite binder solution system combining polymer binder, cyclic carbonate solvent, chain carbonate solvent, and lithium salt additive. This composite formulation achieves both binding function and ion conductivity, allowing the electrode to maintain uniformity while providing sufficient binding force between active material and solid electrolyte
2Quantity of substance
If the electrode size is increased to improve battery capacity, then the charge and discharge capacity is improved, but the manufacturing complexity and time increase
Solution Approach 1:
The patent optimizes the viscosity and composition parameters of the binder solution to enable effective coating and formation of large-area electrodes. The controlled solvent ratios and additive concentrations allow for uniform distribution over large areas, increasing battery capacity while maintaining efficient manufacturing processes without excessive time loss
3Strength
If the binder solution contains high polymer concentration to improve binding, then the binding strength is improved, but the ion transmission path formation is impeded
Solution Approach 1:
The patent creates a composite binder solution where polymer binder is combined with cyclic carbonate, chain carbonate, and lithium salt additives. This composite system maintains appropriate viscosity and ion conductivity even at effective binding concentrations, ensuring both strong binding and reliable ion transmission paths in the electrode
Solution Approach 2:
The lithium salt and carbonate solvents act as intermediaries in the binder solution, facilitating ion transmission while the polymer provides binding. This intermediary system allows the binder to function effectively without impeding ion pathways, resolving the contradiction between binding strength and ion transmission reliability
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 solution significantly increases the charge and discharge capacity and lifespan of all-solid-state batteries, enabling their use in high-temperature environments and reducing manufacturing time.
Implementation Method 1
the binder solution includes a polymer binder, a first solvent, and an ion-conductive additive. The ion-conductive additive may include lithium salt and a second solvent
Implementation Method 2
a lithium element of the lithium salt may exist in the state of being bonded with the oxygen element in the second solvent
Data Source
AI summary
The present disclosure relates to a binder solution for all-solid-state batteries. The binder solution includes a polymer binder, a first solvent, and an ion-conductive additive, wherein the ion-conductive additive includes lithium salt and a second solvent, which is different from the first solvent.