Recompressed Graphite Worm Cathode for Multivalent Battery
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Solution Overview
Problem
Current rechargeable batteries, such as lithium-ion and alkaline Zn/MnO2, face limitations in energy density, power density, cycle life, and voltage stability due to issues like low specific capacity, long recharge times, and the formation of irreversible phases, which hinder their widespread industrial application.
Innovation Solution
A multivalent metal-ion battery design featuring an anode with a multivalent metal alloy and a cathode made of exfoliated graphite or carbon materials with inter-flake pores, allowing for reversible metal deposition and dissolution, and optimized electrolytes to achieve high specific capacity and stable discharge voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If graphite-based anodes are used in Li-ion batteries, then safety is improved, but specific capacity decreases significantly
Solution Approach 1:
The patent segments the cathode material into worm-like structures with internal porosity, creating multiple pathways for ion transport and increasing effective surface area. This segmentation allows the cathode to achieve high capacity while maintaining safety through controlled ion diffusion pathways
Solution Approach 2:
The patent employs porous worm-like cathode structures with controlled porosity to enhance ion transport and increase effective surface area. The porous structure allows electrolyte penetration throughout the material, enabling high capacity utilization while maintaining structural integrity and safety
2Ease of manufacture
If conventional cathode materials are used, then manufacturing simplicity is maintained, but energy density is limited
Solution Approach 1:
The patent changes the morphological parameters of the cathode material from conventional particulate forms to worm-like structures with controlled porosity and surface area. This parameter change enables higher energy density through increased ion transport efficiency and active material utilization, while the synthesis method remains compatible with existing manufacturing processes
3Stability of the object's composition
If standard graphite structures are used, then structural stability is maintained, but ion diffusion speed decreases
Solution Approach 1:
The patent transitions from two-dimensional surface interactions to three-dimensional worm-like structures with internal porosity. This dimensional change creates multiple diffusion pathways and reduces ion transport distances, significantly increasing ion diffusion speed while maintaining structural stability through the interconnected worm morphology
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 exhibits a discharge voltage plateau at 1.0 volts or higher, providing a constant voltage output, improved cycle life, and energy densities comparable to lithium-ion batteries, while maintaining the high power density characteristics of supercapacitors.
Implementation Method 1
The EDLC mechanism is based on surface ion adsorption. The required ions are pre-existing in a liquid electrolyte and do not come from the opposite electrode.
Implementation Method 2
reversible deposition and dissolution of a multivalent metal (selected from Ni, Zn, Be, Mg, Ca, Ba, La, Ti, Ta, Zr, Nb, Mn, V, Co, Fe, Cd, Cr, Ga, In, or a combination thereof) at the anode
Data Source
AI summary
Provided is a multivalent metal-ion battery comprising an anode, a cathode, a porous separator electronically separating the anode and the cathode, and an electrolyte in ionic contact with the anode and the cathode to support reversible deposition and dissolution of a multivalent metal, selected from Ni, Zn, Be, Mg, Ca, Ba, La, Ti, Ta, Zr, Nb, Mn, V, Co, Fe, Cd, Cr, Ga, In, or a combination thereof, at the anode, wherein the anode contains the multivalent metal or its alloy as an anode active material and the cathode comprises a cathode layer of an exfoliated graphite or carbon material recompressed to form an active layer that is oriented in such a manner that the active layer has a graphite edge plane in direct contact with the electrolyte and facing or contacting the separator.