Composite Electrode Nanosheet Solid Electrolyte Ion Transfer
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Solution Overview
Problem
Existing all-solid-state secondary batteries have a zero-dimensional solid electrolyte with a high content requirement, leading to reduced electrode energy density and the need for additional binder and conductive materials, which complicates ion transfer and increases internal resistance.
Innovation Solution
A composite electrode is developed using a combination of high ion conductivity nano/micro-scale inorganic solid electrolytes and an ion-conducting polymer binder, which serves as both an electrolyte and a binder, optimizing the content ratio and mixing process to enhance ion conductivity and adhesion, thereby increasing the active material content and energy density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If zero-dimensional spherical solid electrolyte is used in composite electrode, then ion transfer path can be formed, but solid electrolyte content must be 30 wt % or greater which reduces electrode energy density
Solution Approach 1:
The patent transitions from zero-dimensional spherical solid electrolyte particles to two-dimensional nanosheet solid electrolyte structures. This dimensional change increases the surface area to volume ratio, creating more extensive ion transfer interfaces with electrode active materials without requiring high solid electrolyte content. The nanosheets can be dispersed within the electrode structure to form continuous ion transfer pathways while maintaining high active material loading.
Solution Approach 2:
The patent employs composite electrode structures combining electrode active materials with two-dimensional nanosheet solid electrolytes. The composite architecture allows intimate contact between the nanosheet surfaces and active material particles, creating efficient ion transfer interfaces. This composite approach enables the solid electrolyte to serve dual functions as both ion conductor and structural component, reducing the overall solid electrolyte content requirement while maintaining reliable ion transfer.
2Strength
If separate binder material is included to form electrode, then electrode structure can be maintained, but additional conductive material is also needed which further reduces energy density
Solution Approach 1:
The patent merges the functions of binder and solid electrolyte into a unified two-dimensional nanosheet structure. The nanosheets simultaneously provide mechanical binding to hold electrode components together and serve as ion conductive pathways. This consolidation eliminates the need for separate binder materials and reduces or eliminates the need for additional conductive additives, thereby maximizing electrode active material content and energy density.
Solution Approach 2:
The two-dimensional nanosheet solid electrolyte performs multiple functions: it acts as an ion conductor, a binder holding the electrode structure together, and potentially as a conductive additive. This multi-functionality replaces what would traditionally require separate components (binder + conductive additive), reducing the total non-active-material content and increasing energy density.
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 composite electrode achieves higher energy density and mechanical strength while minimizing the risk of explosion or ignition, with improved ion conductivity and safety, utilizing lithium metal for high theoretical capacity.
Implementation Method 1
an inorganic ion conductor for an ion movement path and an organic ion conductor for adhesion of the electrode active material
Implementation Method 2
putting a high ion conductive solid electrolyte as an inorganic ion conductor into a polymer binder solution in which lithium salt constituting an organic ion conductor is dissociated
Implementation Method 3
preparing a composite binder solution through a ball-milling process; mixing and stirring an electrode active material and the composite binder solution through a mechanical mixing process
Implementation Method 4
drying the electrode slurry applied to the current collector through a drying process
Implementation Method 5
compressing the dried electrode slurry applied on the current collector through a compression process
Data Source
AI summary
Disclosed is a composite electrode for an all-solid-state secondary battery. The composite electrode includes a composite positive electrode and a composite negative electrode, wherein each of the composite positive electrode and the composite negative electrode includes an electrode active material, and an ion-conducting composite binder configured to include an inorganic ion conductor for an ion movement path and an organic ion conductor for binding of the electrode active material.