All solid state battery and anode
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Solution Overview
Problem
Existing all solid state batteries using deposition and dissolution reactions of metal Li face challenges in maintaining reversibility while preventing short circuits, as attempts to inhibit short circuits can degrade the reversibility of these reactions.
Innovation Solution
Incorporating a specific porous layer with an electric resistance of 1Ω to 690Ω and a thickness of 14 μm or less, composed of a fluorine-based resin such as PVDF, within the all solid state battery structure to enhance the reversibility of metal Li deposition and dissolution reactions while preventing short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a porous layer with specific resistance and thickness is introduced to improve reversibility, then the reversibility of deposition and dissolution reaction is improved, but the device complexity increases
Solution Approach 1:
A porous layer comprising a resin is introduced as an intermediary component between the solid electrolyte layer and the anode current collector. This intermediate layer mediates the interface interactions, improving the reversibility of metal Li deposition and dissolution reactions while maintaining structural integrity and preventing short circuits.
Solution Approach 2:
The porous layer's electrical resistance is controlled within a specific range (1Ω to 690Ω) and its thickness is limited to 14 μm or less. By optimizing these parameters, the layer achieves the dual function of improving reaction reversibility and preventing short circuits without excessive complexity.
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 implementation of this porous layer structure improves the reversibility of metal Li reactions and effectively inhibits short circuits, maintaining high energy density and efficient charge/discharge performance.
Implementation Method 1
a solid electrolyte layer... a lithium ion conducting inorganic solid electrolyte
Implementation Method 2
an electric resistance of the porous layer is 1Ω or more and 690Ω or less
Implementation Method 3
precipitation and lytic reaction of metal lithium occur at the time of charge and discharge in the anode electrode
Implementation Method 4
utilizing a deposition and dissolution reaction of a metal Li as an anode reaction
Data Source
AI summary
A main object of the present disclosure is to provide an all solid state battery in which the reversibility of the deposition and dissolution reaction of a metal Li can be improved while inhibiting an occurrence of short circuit. The above object is achieved by providing an all solid state battery utilizing a deposition and dissolution reaction of a metal Li as an anode reaction, the all solid state battery comprising: an anode current collector, a porous layer comprising a resin, a solid electrolyte layer, a cathode active material layer, and a cathode current collector, in this order; wherein an electric resistance of the porous layer is 1Ω or more and 690Ω or less; and a thickness of the porous layer is 14 μm or less.