Solid-State Battery Mg Gradient Layer for Short-Circuit Suppression
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Solution Overview
Problem
All solid state batteries face challenges in preventing short circuits, which degrade performance, especially under high current loads and uneven lithium deposition.
Innovation Solution
Incorporating a protective layer with a mixture of Mg-containing particles and solid electrolyte between the anode current collector and the solid electrolyte layer, where Mg concentration increases stepwise or continuously from the solid electrolyte side to the anode current collector side, inhibiting short circuit occurrence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a protective layer with uniform Mg concentration is used, then the structure is simple, but short circuit occurs due to uneven lithium deposition under high current loads
Solution Approach 1:
The protective layer employs a non-uniform Mg concentration distribution, with higher Mg concentration near the solid electrolyte layer interface and lower concentration toward the anode current collector. This local variation in composition addresses the uneven lithium deposition problem by providing enhanced protection where short circuits are most likely to occur (at the interface), while maintaining structural simplicity overall.
2Productivity
If a simple protective layer is used, then manufacturing is easier, but lithium deposition efficiency degrades under high charge rates
Solution Approach 1:
The invention changes the concentration parameter of Mg within the protective layer, creating a gradient from high concentration at the solid electrolyte interface to low concentration at the current collector side. This parameter variation enables the protective layer to function effectively at high charge rates (0.5C or more) by optimizing lithium ion transport and deposition uniformity, while still using a relatively simple single-layer structure that can be manufactured using conventional techniques.
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 effectively suppresses short circuits and enhances lithium deposition and dissolution efficiency, maintaining battery performance even at high charge and discharge rates.
Implementation Method 1
Mg concentration increases stepwisely or continuously from a first surface which is the solid electrolyte layer side towards a second surface which is the anode current collector side
Data Source
AI summary
A main object of the present disclosure is to provide an all solid state battery in which occurrence of short circuit is inhibited. The present disclosure achieves the object by providing an all solid state battery comprising an anode including at least an anode current collector, a cathode, and a solid electrolyte layer arranged between the anode and the cathode; wherein a protective layer containing Mg is arranged between the anode current collector and the solid electrolyte layer; the protective layer includes a mixture layer including a Mg-containing particle containing the Mg, and a solid electrolyte; and in the protective layer, Mg concentration increases stepwisely or continuously from a first surface which is the solid electrolyte layer side towards a second surface which is the anode current collector side.