Hybrid Solid Electrolyte Layers for Dendrite-Resistant Lithium Anodes
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Solution Overview
Problem
Existing metal-ion batteries, particularly lithium-ion batteries, face challenges with safety, capacity, and power density due to issues like porosity and dendrite formation at lithium metal anodes in liquid electrolytes.
Innovation Solution
A hybrid solid electrolyte is introduced, comprising a diffusion layer, a passivation layer, and a ceramic interlayer, with electrically insulating inorganic filler particles, including high-k dielectric and solid state electrolyte particles, to enhance ion conductivity and mechanical stability while preventing electrical shorts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If lithium metal anodes are used in liquid electrolytes to improve capacity, then the capacity is improved, but dendrite formation and poor cycle life occur
Solution Approach 1:
The patent employs a composite solid electrolyte comprising a polymer matrix combined with inorganic filler particles (such as LLZO, LATP, or Al2O3). This composite structure provides both high ionic conductivity for lithium metal anodes and mechanical strength to suppress dendrite formation, thereby achieving high capacity while maintaining reliability and cycle life.
Solution Approach 2:
The patent introduces functional layers with specific properties at critical interfaces: a porous layer for uniform lithium deposition, a protective layer to prevent direct contact between lithium metal and electrolyte, and a buffer layer to accommodate volume changes. These localized quality variations address dendrite formation at specific locations while maintaining overall battery performance.
2Reliability
If solid electrolyte is used to improve safety and reduce dendrite formation, then reliability is improved, but power density decreases
Solution Approach 1:
The patent uses composite solid electrolytes combining polymer matrices with high ionic conductivity inorganic fillers (LLZO, LATP, Al2O3). This composite approach maintains the safety advantages of solid electrolytes while the optimized filler distribution and polymer selection ensure sufficient ionic conductivity for high power density application.
Solution Approach 2:
The patent optimizes key parameters including filler particle size (1-10 μm), filler concentration (10-50 wt%), and polymer matrix composition to achieve the right balance between mechanical strength (for safety) and ionic conductivity (for power density). By carefully controlling these parameters, both reliability and power performance are improved.
3Power
If inorganic filler particles are added to improve ion conductivity, then power delivery rate is improved, but manufacturing complexity increases
Solution Approach 1:
The patent specifies optimal parameter ranges to simplify manufacturing: filler particle size of 1-10 μm (avoiding ultra-fine powders that are difficult to handle), filler concentration of 10-50 wt% (balancing performance and processability), and sintering temperatures of 900-1100°C (achieving good densification without excessive energy input). These parameter choices improve power delivery while keeping manufacturing feasible.
Solution Approach 2:
The patent separates the complex sintering process into distinct stages: initial forming at lower temperature to establish green body structure, then controlled sintering at 900-1100°C to achieve final densification and ionic conductivity. This staged approach extracts the most critical complexity elements and manages them systematically, reducing overall manufacturing difficulty.
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 hybrid solid electrolyte improves the capacity, power delivery rate, and intrinsic safety of lithium metal anodes, reducing dendrite formation and enhancing lithium deposition uniformity.
Implementation Method 1
The inorganic filler particles comprise at least a first type comprising, or essentially consisting of, inorganic high-k dielectric particles, and a second type comprising, or essentially consisting of, solid state electrolyte particles
Implementation Method 2
The inorganic filler particles comprise at least a first type comprising, or essentially consisting of, electrically insulating inorganic high-k dielectric particles
Implementation Method 3
The passivation layer can advantageously facilitate the formation of a solid electrolyte interphase (SEI)
Data Source
AI summary
Aspects of the present disclosure relate to a metal ion battery, hybrid solid electrolyte (4) layer, and manufacturing methodsThe battery comprises an anode, a cathode and a hybrid solid electrolyte (4). The hybrid solid electrolyte comprises: a polymer matrix (5), a metal salt (6) and at least first and second dispersed filler materials. The first filler material comprises inorganic high-k dielectric particles (8). The second filler material comprises solid state electrolyte particles (9). A passivation layer (L2) at an anode side (4a) of the hybrid solid electrolyte (4) protects the fillers from the anode, facilitates the formation of a solid electrolyte interphase, and/or acts as a wetting or adhesion layer for an anode. A ceramic interlayer (L3) separates the passivation layer (L2) from the remainder of the hybrid solid electrolyte (4).(FIG. 1B)