Lithium Solid Battery Pore Radius Control for Dendrite Inhibition
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Lithium solid batteries face challenges in inhibiting the generation of short circuits caused by dendrite growth, which is not effectively addressed by existing technologies.
Innovation Solution
A lithium solid battery design incorporating a solid electrolyte layer with sulfide glass containing Li, P, and S elements, with an average pore radius of 0.0057 μm or less, and a specific ion conductor structure that inhibits dendrite growth by controlling pore size and connectivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a solid electrolyte layer is used to replace liquid electrolyte, then safety is improved and flammable organic solvent is eliminated, but dendrite growth causing short circuits still occurs
Solution Approach 1:
The patent employs a porous solid electrolyte layer with specifically controlled pore size (0.003 μm to 0.01 μm) and pore volume (0.03 mL/g to 0.08 mL/g). The porous structure allows the electrolyte to maintain mechanical integrity while providing pathways that inhibit dendrite penetration, thus preventing short circuits while maintaining safety benefits of solid electrolyte.
Solution Approach 2:
The patent optimizes specific parameters of the solid electrolyte including pore radius (0.003-0.01 μm), pore volume (0.03-0.08 mL/g), and density (1.9 g/cm³ to 2.1 g/cm³). By precisely controlling these parameters, the electrolyte structure is tuned to prevent dendrite growth while maintaining ionic conductivity and mechanical strength.
2Object-affected harmful factors
If the pore radius of solid electrolyte is reduced to inhibit dendrite, then short circuit prevention is improved, but ion conductivity may be affected
Solution Approach 1:
The patent identifies an optimal parameter window where pore radius is 0.003 μm to 0.01 μm and pore volume is 0.03 mL/g to 0.08 mL/g. Within this range, the pore size is small enough to block dendrites but large enough to maintain ion transport pathways, balancing short circuit prevention with ion conductivity.
Solution Approach 2:
The solid electrolyte is formulated as a composite with specific composition ratios: 60-80 wt% sulfide glass, 10-30 wt% LiI, and 5-20 wt% Li2S. This composite structure provides both the mechanical strength needed for dendrite blocking and the ionic pathways necessary for conductivity.
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 battery effectively prevents short circuits by maintaining a small pore radius and controlled pore connectivity, enhancing the stability and safety of lithium solid batteries.
Implementation Method 1
a solid electrolyte layer having a sulfide glass containing an ion conductor which has a Li element, a P element and a S element, and having an average pore radius calculated by mercury press-in method being 0.0057 μm or less
Data Source
AI summary
A problem of the present invention is to provide a lithium solid battery in which generation of short-circuits caused by dendrite is inhibited. The present invention solves the problem by providing a lithium solid battery comprising a solid electrolyte layer having a sulfide glass containing an ion conductor which has a Li element, a P element and a S element, and having an average pore radius calculated by mercury press-in method being 0.0057 μm or less.