3D Porous Anode for Solid-State Battery Dendrite Control
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Solution Overview
Problem
Current solid-state batteries face challenges with energy density, dendrite formation, and hermetic sealing due to the limitations of liquid electrolytes and brittle ceramic materials, which restrict their application in electric vehicles and electronic devices.
Innovation Solution
A three-dimensional (3D) porous anode structure with ionically conducting electrolyte strands and an electronically conducting network is developed, integrated into a monolithic ceramic electrochemical cell housing, using high-density ceramic materials like LLZO and phosphate glass ceramics, to enhance ionic conductivity and prevent dendrite formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If lithium metal anodes are used, then energy density is improved, but dendrite formation occurs causing short circuits and safety issues
Solution Approach 1:
The patent employs a porous anode structure filled with liquid electrolyte, creating a three-dimensional network of electrolyte-filled pores. This porous configuration increases the effective contact area between lithium and electrolyte while preventing dendrite propagation through the pore walls, thus maintaining high energy density without compromising safety
Solution Approach 2:
The invention uses a composite anode structure combining porous solid material (providing structural integrity and dendrite barrier) with liquid electrolyte (providing ionic conductivity and lithium storage). This composite approach leverages the advantages of both materials to achieve high energy density and dendrite resistance simultaneously
2Reliability
If liquid electrolyte is used, then ionic conductivity is improved, but dendrite growth is not prevented and safety is compromised
Solution Approach 1:
The liquid electrolyte is contained within a porous matrix structure where the pore walls act as physical barriers to dendrite growth. The electrolyte maintains high ionic conductivity within the pores while the porous structure prevents dendrites from bridging the anode and cathode, solving the safety issue without sacrificing conductivity
3Reliability
If ceramic electrolyte is used, then dendrite resistance is improved, but manufacturing complexity increases due to integration challenges
Solution Approach 1:
The patent uses a porous ceramic or ceramic-coated anode structure where the porous ceramic provides dendrite resistance while the pore-filled liquid electrolyte maintains ionic conductivity. This porous ceramic architecture is more manufacturable than dense ceramic electrolytes as it can be formed through conventional ceramic processing techniques followed by electrolyte infiltration
4Reliability
If intercalation anodes are used, then safety is improved by preventing dendrites, but energy density decreases to less than 10% of theoretical lithium metal capacity
Solution Approach 1:
The porous anode structure allows lithium metal to be deposited throughout the three-dimensional pore network rather than just on the surface. This increases the effective lithium storage capacity while the porous ceramic matrix prevents dendrite formation, achieving both high energy density and safety
Solution Approach 2:
The invention transitions from two-dimensional surface-based intercalation to three-dimensional volume-based lithium storage within the porous matrix. This dimensional change enables utilization of the bulk lithium metal capacity while maintaining safety through the porous structure's dendrite-blocking capability
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 increases the volumetric energy density of batteries, prevents short circuits, and achieves a higher critical current density, enabling more efficient and safer lithium-ion battery performance.
Implementation Method 1
ionically conducting electrolyte strands extending through the anode from the anode current collector to the electrolyte separator
Implementation Method 2
an electronically conducting network extending on sidewall surfaces of the pores from the anode current collector to the electrolyte separator
Implementation Method 3
using high-density ceramic materials like LLZO and phosphate glass ceramics, to enhance ionic conductivity
Data Source
AI summary
An electrochemical cell is provided which includes a cathode, an anode, an electrolyte separator, and an anode current collector located on the anode. The anode is a three-dimensional (3D) porous anode including ionically conducting electrolyte strands and pores which extend through the anode from the anode current collector to the electrolyte separator. The anode also includes electronically conducting networks extending on sidewall surfaces of the pores from the anode current collector to the electrolyte separator.