PTC Layer Particle Size Optimization for All-Solid-State Battery
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Solution Overview
Problem
All-solid-state batteries face challenges in increasing electron resistance at high temperatures when the content of insulating inorganic substances in the PTC layer is relatively small, as the polymer expands, causing conductive materials to reconduct and reduce electron resistance.
Innovation Solution
Incorporating a PTC layer with a conductive material, an insulating inorganic substance, and a polymer, where the proportion of the particle size D90 of the insulating inorganic substance to the thickness of the PTC layer (D90/TPTC) is between 0.6 and 1.0, ensuring sufficient electron resistance at high temperatures even with a low content of insulating inorganic substance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the content of insulating inorganic substance in the PTC layer is increased to increase electron resistance at high temperature, then the electron resistance in normal use increases, but the PTC layer thickness must be increased which affects battery density
Solution Approach 1:
The patent optimizes the particle size parameter D90 of the insulating inorganic substance to be within 0.5 μm to 5 μm, and controls the PTC layer thickness TPTC to achieve a D90/TPTC ratio between 0.6 and 1.0. This parameter optimization allows the PTC layer to achieve sufficient electron resistance at high temperature with minimal thickness (reducing impact on battery density) while maintaining low electron resistance during normal use.
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 increases electron resistance at high temperatures while maintaining low electron resistance in normal use by suppressing the compression of the PTC layer and preventing reconduction of conductive materials.
Implementation Method 1
a PTC layer containing a conductive material, an insulating inorganic substance, and a polymer
Implementation Method 2
a proportion of a particle size D90 of the insulating inorganic substance, D90, to a thickness of the PTC layer, TPTC, regarded as D90/TPTC is 0.6 or more and 1.0 or less
Data Source
AI summary
An all-solid-state battery including a laminated body with a cathode current collecting layer, cathode active material layer, solid electrolyte layer, anode active material layer, and anode current collecting layer in this order, and a restraining member that applies a restraining pressure to the laminated body in a laminated direction; containing a conductive material, an insulating inorganic substance, and a polymer, is in at least one of a position between the cathode active material layer and the cathode current collecting layer, and a position between the anode active material layer and the anode current collecting layer; the content of the insulating inorganic substance in the PTC layer is 10 volume % or more and 40 volume % or less; and a proportion of a particle size D90 of the insulating inorganic substance, D90, to a thickness of the PTC layer, TPTC, regarded as D90/TPTC is 0.6 or more and 1.0 or less.