Metal Salt Composite Cathodes for High-Energy Sustainable Batteries
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Solution Overview
Problem
Conventional metal and metal ion batteries face limitations in energy density and sustainability, particularly with cathodes like lithium nickel manganese cobalt oxide, which have high production costs and environmental concerns.
Innovation Solution
Development of metal salt composite cathodes comprising alkali or alkaline earth metal salts, transition metal sulfides or carbonates, and carbon additives, such as Li3PO4·3/4Cu2S or LiOH·1/4Cu2S, which undergo reversible multi-electron redox conversion reactions, enhancing energy density and coulombic efficiency while being more sustainable.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional cathodes like lithium nickel manganese cobalt oxide are used, then high energy density is achieved, but production costs increase and environmental concerns arise
Solution Approach 1:
The patent employs composite cathode materials combining metal salts (alkali or alkaline earth metals) with transition metal sulfides or carbonates. This composite approach achieves high energy density while using more sustainable and potentially lower-cost materials compared to conventional lithium nickel manganese cobalt oxide cathodes.
Solution Approach 2:
The invention utilizes reversible multi-electron redox conversion reactions that change the oxidation states of transition metals (Fe, Mn, Ni, Co, Cu, Zn). This parameter change in electron transfer enables high energy density while using alternative material compositions.
2Use of energy by moving object
If conventional cathodes like lithium nickel manganese cobalt oxide are used, then high energy density is achieved, but environmental impact increases
Solution Approach 1:
The composite structure of metal salts combined with transition metal sulfides or carbonates provides high energy density while reducing environmental impact through more sustainable material selection, avoiding the toxic and environmentally problematic elements in conventional cathodes.
Solution Approach 2:
The patent employs metal salts and transition metal compounds that are generally more abundant and less environmentally harmful than the rare and toxic metals used in conventional cathodes, aligning with sustainable development goals.
3Ease of manufacture
If metal salt composite cathodes are used, then sustainability is improved, but energy density may be reduced
Solution Approach 1:
The composite cathode structure combines metal salts with transition metal sulfides or carbonates in specific ratios and configurations, enabling the material to achieve both sustainability and high energy density through synergistic effects of the composite components.
Solution Approach 2:
The reversible multi-electron redox conversion reactions enable the composite materials to achieve high energy density by maximizing electron transfer per unit mass, compensating for the use of alternative materials.
4Productivity
If metal salt composite cathodes are used, then coulombic efficiency is enhanced, but cycling stability may be compromised
Solution Approach 1:
The composite structure provides both high coulombic efficiency through reversible redox reactions and cycling stability through the robust framework of metal salts combined with transition metal sulfides or carbonates, which maintain structural integrity during repeated charge-discharge cycles.
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 composite cathodes demonstrate high energy densities, stable cycling performance, and improved sustainability, offering capacities up to 368 mAh/g and specific energies exceeding 940 Wh/kg, with potential for longer cycle life and reduced environmental impact.
Implementation Method 1
which undergo reversible multi-electron redox conversion reactions, enhancing energy density and coulombic efficiency
Data Source
AI summary
An metal composite cathode includes a composite of (i) a first component comprising one or more metal salts, wherein each metal salt is an alkali metal salt or an alkaline earth metal salt comprising M where M is Li, Na, K, Mg, Ca, or any combination thereof, (ii) a second component comprising a transition metal, a transition metal sulfide, a transition metal carbonate, a transition metal halide, or any combination thereof, and (iii) a carbon additive. The composite cathode may be used in a metal battery or metal ion battery.