Organic Cathode Solid-State Battery to Block Quinone Dissolution
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Solution Overview
Problem
Quinones, despite their advantages as cathode materials in Li batteries, face challenges due to low ionic and electronic conductivity, which necessitate high carbon and catholyte content, and are prone to dissolution in liquid electrolytes, leading to cell failure and reduced capacity.
Innovation Solution
A hybrid cell configuration using a lithium garnet ceramic solid electrolyte (LLZO) as a substantially impermeable membrane to block dissolved organic molecules, combined with a solid or liquid catholyte, and an organic active material like quinones, to prevent transport and enhance stability and capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If quinones are used as cathode materials, then high specific capacity and sustainability are achieved, but low ionic and electronic conductivity results in high carbon and catholyte content requirements
Solution Approach 1:
The patent introduces a solid electrolyte as an intermediary component between the quinone cathode and liquid electrolyte. This solid electrolyte layer enables ionic conduction while preventing quinone dissolution, thereby reducing the need for excessive carbon and catholyte content to compensate for the low conductivity of quinones.
Solution Approach 2:
The patent creates a composite cathode structure combining quinone with conductive materials and a solid electrolyte layer. This composite approach enhances the overall ionic and electronic conductivity of the cathode system, reducing the required content of carbon and catholyte while maintaining high specific capacity.
2Quantity of substance
If small-molecular-weight quinones are used, then high specific capacity is achieved, but dissolution into liquid electrolytes causes cell failure
Solution Approach 1:
The solid electrolyte serves as a physical barrier and intermediary layer that prevents direct contact between the quinone molecules and the liquid electrolyte. This intermediary structure allows ionic transport while blocking the dissolution of quinone into the liquid electrolyte, thereby preventing cell failure while maintaining high specific capacity.
Solution Approach 2:
The patent employs a thin solid electrolyte film that acts as a protective shell around the quinone cathode material. This thin film structure provides effective dissolution prevention while maintaining ion transport efficiency and preserving the high specific capacity of small-molecular-weight quinones.
3Reliability
If quinones are bound to polymers or synthesized as larger molecules, then dissolution is prevented, but volumetric and specific capacity decrease
Solution Approach 1:
Instead of modifying the quinone molecules themselves, the patent introduces a solid electrolyte as an external intermediary barrier. This approach prevents dissolution by blocking the interface between quinone and liquid electrolyte, rather than increasing molecular weight, thereby preserving the high volumetric and specific capacity of small-molecular-weight quinones.
4Reliability
If a solid electrolyte is used to block dissolved organic molecules, then cathode utilization and cycle life are enhanced, but device complexity increases
Solution Approach 1:
The solid electrolyte performs multiple functions simultaneously: it acts as an ionic conductor, a physical barrier against quinone dissolution, and a separator preventing polysulfide shuttle. This multi-functionality reduces the need for additional components, thereby limiting the increase in device complexity while achieving enhanced cycle life and cathode utilization.
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 LLZO hybrid cell configuration achieves superior cycling performance, higher cathode utilization, and extended cycle life by preventing polysulfide shuttle and side reactions, while maintaining high ionic conductivity and stability.
Implementation Method 1
a lithium garnet ceramic solid electrolyte (LLZO) as a substantially impermeable membrane to block dissolved organic molecules
Implementation Method 2
block the transport of dissolved polysulfides to the anode where they can react with the lithium and reduce capacity
Data Source
AI summary
This disclosure provides systems, methods, and apparatus related to batteries with an organic cathode and a solid electrolyte. In one aspect, a device includes an anode, a cathode, and a separator disposed between the anode and the cathode. The anode comprises lithium. The cathode comprises a catholyte and an organic active material disposed therein. The separator comprises a solid-state electrolyte.