Stacked All-Solid-State Battery with Direct Current Collector Bonding
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Solution Overview
Problem
Stacked all-solid-state batteries face challenges with low ion conductivity in organic solid electrolytes, high grain boundary resistance in oxide-based electrolytes, and reduced volumetric energy density due to thickened current collectors, as well as adhesive-induced resistance and void reduction issues, which affect output characteristics and cycle life.
Innovation Solution
The battery design includes a sulfide-based solid electrolyte with a coating-type configuration, where cathode and anode current collectors have uneven surfaces for increased contact area and electron conductivity, and voids at interfaces to absorb material expansion, enhancing thermal conductivity and heat radiation, and allowing for the replacement of deteriorated cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If adhesive is used to bond current collectors, then bonding strength is improved, but resistance increases due to adhesive-induced resistance
Solution Approach 1:
The invention removes the adhesive layer from the bonding interface between current collectors. Instead of using adhesive to bond the current collectors, the patent directly contacts the cathode current collector with the anode current collector, eliminating the adhesive-induced resistance problem while maintaining bonding strength through direct metal-to-metal contact.
2Strength
If current collectors are thickened to improve structural integrity, then strength is improved, but volumetric energy density decreases
Solution Approach 1:
The invention changes the thickness parameter of the current collectors to an optimized range (1-10 μm) that balances structural integrity with volumetric energy density. By controlling the current collector thickness within this specific range, the patent achieves sufficient mechanical strength while minimizing the volume occupied by non-active materials, thereby maintaining high volumetric 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
This configuration improves output characteristics, cycle life, and extends the battery's usage time by maintaining high electron conductivity, efficient heat radiation, and enabling the replacement of deteriorated cells, while maintaining structural integrity and energy density.
Implementation Method 1
a solid electrolyte layer disposed between the cathode active material layer and the anode active material layer and containing a solid electrolyte having at least a lithium ion conductivity
Implementation Method 2
cathode and anode current collectors have uneven surfaces for increased contact area and electron conductivity
Implementation Method 3
voids at interfaces to absorb material expansion
Implementation Method 4
enhancing thermal conductivity and heat radiation
Data Source
AI summary
Provided is a stacked all-solid-state battery including a plurality of all-solid-state batteries, each all-solid-state battery including a cathode layer that has a cathode current collector and a cathode active material layer containing a cathode active material and formed on the cathode current collector, an anode layer that has an anode current collector and an anode active material layer containing an anode active material and formed on the anode current collector, and a solid electrolyte layer disposed between the cathode active material layer and the anode active material layer and containing a solid electrolyte having a lithium ion conductivity. The plurality of all-solid-state batteries are stacked, and the plurality of all-solid-state batteries include two adjacent all-solid-state batteries, the two all-solid-state batteries being configured such that the cathode current collector of one all-solid-state battery is directly joined to the anode current collector of the other all-solid-state battery.