Sulfide-Impregnated Solid-State Battery Core
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Solution Overview
Problem
Current sulfide-based solid-state batteries face challenges such as inhomogeneous distribution of active materials and solid-state electrolyte, leading to decreased energy density and increased manufacturing costs due to sensitivity to moisture and limited solvent and binder options.
Innovation Solution
The method involves dissolving sulfide-based solid-state electrolyte into a solvent to form a precursor solution, which is then impregnated into a tailor-made cell core with meshed current collectors, allowing for uniform distribution and reducing the need for tight moisture control during manufacturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sulfide-based solid-state electrolyte is added into the electrode to build up sufficient ionic contacts, then the electrode-electrolyte interface is improved, but the battery energy density decreases
Solution Approach 1:
The electrode is designed with a porous structure that allows sulfide-based solid-state electrolyte to be impregnated into the pore spaces. This creates a three-dimensional network of ionic contact pathways throughout the electrode, improving the electrode-electrolyte interface without requiring excessive electrolyte content that would compromise energy density.
Solution Approach 2:
The sulfide-based solid-state electrolyte is selectively distributed in the pore spaces between active material particles, creating localized ionic contact zones where needed. This targeted distribution improves interfacial contact at critical locations while minimizing the overall electrolyte content in the electrode.
2Reliability
If sulfide-based solid-state electrolyte is used in the electrode, then high conductivity is achieved, but sensitivity to moisture increases leading to H2S gas generation
Solution Approach 1:
The patent employs an inert atmosphere environment during the wet coating process to prevent moisture from reaching the sulfide-based solid-state electrolyte. By controlling the atmospheric conditions in the coating chamber, the highly reactive sulfide electrolyte is protected from moisture-induced decomposition and H2S gas generation while maintaining its high ionic conductivity properties.
3Manufacturing precision
If wet coating method is used to prepare sulfide-based electrode, then homogeneous distribution can be achieved, but tight moisture control is required increasing manufacturing cost
Solution Approach 1:
The wet coating process is conducted in an inert atmosphere environment that prevents moisture contact with the sulfide-based solid-state electrolyte. This eliminates the need for expensive moisture control systems and stringent environmental controls typically required when handling moisture-sensitive sulfide electrolytes, thereby reducing manufacturing costs while maintaining distribution homogeneity.
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
This approach enhances the electrode-electrolyte interface, decreases the solid-state electrolyte content, and boosts the power capability of solid-state batteries while simplifying the manufacturing process and reducing costs.
Implementation Method 1
S-SSE is involved from being dissolved into solvent to form the precursor solution
Implementation Method 2
followed by its impregnation into as-formed cell core
Implementation Method 3
uniformly distributed sulfide-based solid-state electrolyte (S-SSE) in pore spaces
Implementation Method 4
The solvent is then evaporated from the cell core to dry the cell core and solidify the sulfide-based solid-state electrolyte within the cell core
Data Source
AI summary
A sulfide-impregnated solid-state battery is provided. The battery comprises a cell core constructed by basic cell units. Each unit comprises a positive electrode comprising a cathode layer and a positive meshed current collector comprising a conductive material which is further coated by oxide-based solid-state electrolyte. The cell unit further comprises a negative electrode comprising an anode layer and a negative meshed current collector comprising a conductive material which is further coated by oxide-based solid-state electrolyte. The positive and negative electrodes are stacked together to form the cell unit. The two coated oxide-based solid electrolyte layers are disposed between the positive and negative electrode as dual separators. Such a cell unit may be repeated or connected in parallel or bipolar stacking to form the cell core to achieve a desired battery voltage, power and energy. The cell core comprises a sulfide-based solid-state electrolyte dispersed in the pore structures of cell core.