3D Porous Solid-State Cathode for Dendrite-Resistant Energy Density
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Solution Overview
Problem
Current solid-state lithium-ion batteries face challenges such as dendrite formation, low energy density, high internal resistance, and difficulty in achieving a hermetic seal, which limit their performance and safety.
Innovation Solution
A 3D porous cathode structure with electronically conducting and ionically conducting networks is integrated into a monolithic ceramic electrochemical cell housing, using additive manufacturing to form a continuous electrolyte network and hermetically sealed anode spaces, enhancing lithium ion and electron transport.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If lithium metal anodes are used, then energy density is improved, but dendrite formation occurs causing safety issues
Solution Approach 1:
A solid electrolyte layer is introduced as an intermediary between the lithium metal anode and cathode. This solid electrolyte acts as a physical barrier that prevents dendrite penetration while maintaining ionic conductivity, thus enabling the use of high-capacity lithium metal anodes without the safety hazards of dendrite formation.
Solution Approach 2:
The patent employs porous solid electrolyte structures that provide controlled pathways for lithium ion transport. The porous architecture allows uniform lithium deposition by distributing current density evenly, preventing dendrite formation while maintaining high energy density through efficient ion conduction.
2Reliability
If ceramic electrolyte is used, then dendrite formation is resisted, but manufacturing complexity increases
Solution Approach 1:
The patent uses porous ceramic electrolyte structures that can be manufactured using established techniques like tape casting and sintering. The porous architecture is formed through controlled burnout of organic templates, creating interconnected channels for ion transport while maintaining the ceramic's dendrite-blocking properties, thus reducing manufacturing complexity.
3Reliability
If planar interface is used between lithium and ceramic electrolyte, then hermetic seal is achieved, but energy storage capacity is limited
Solution Approach 1:
The patent transitions from a two-dimensional planar interface to a three-dimensional porous interface between the lithium anode and ceramic electrolyte. This dimensional change dramatically increases the interfacial area for lithium ion insertion, enabling much higher energy storage capacity while the surrounding ceramic structure maintains the hermetic seal.
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 solution results in higher volumetric energy density, improved rate performance, and reduced internal resistance, while maintaining a hermetic seal and preventing dendrite growth, at lower production costs compared to conventional lithium-ion batteries.
Implementation Method 1
a separator interconnecting the first electrode and the second electrode, the separator including a solid-state electrolyte
Implementation Method 2
at least one of the first oriented pores and the second oriented pores includes an electronically conducting network extending on sidewall surfaces of the at least one of the first oriented pores and the second oriented pores from a corresponding one of the first and second current collectors to the electrolyte separator
Data Source
AI summary
A solid-state electrochemical cell is provided including a first electrode connected to a first current collector, a second electrode connected to a second current collector, a separator interconnecting the first electrode and the second electrode, the separator including a solid-state electrolyte, first oriented pores including a first electrode material formed in the first electrode, and second oriented pores including a second electrode material formed in the second electrode, wherein at least one of the first oriented pores and the second oriented pores includes an electronically conducting network extending on sidewall surfaces thereof from a corresponding one of the first and second current collectors to the electrolyte separator. The second electrode includes a filling aperture including a seal configured to isolate the first electrode from cathode material in the second electrode.