Modified ABOz Oxide Electrodes for Battery Cycling Stability
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Solution Overview
Problem
Manganese dioxide (MnO2) exhibits poor cycling and storage capabilities in rechargeable electrochemical batteries, limiting its use in these applications.
Innovation Solution
Development of modified oxide compositions with the formula ABOz, where A includes cations like Mg, Ca, Sr, Y, and B includes cations like V, Cr, Mn, Fe, and Ni, with specific mole fractions and a crystalline structure, and a method involving acidic treatment to produce a modified composition with improved properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If MnO2 is used as electrode material, then high charge capacity is achieved, but poor cycling and storage capabilities occur
Solution Approach 1:
The patent applies composite materials by combining MnO2 with metal hydroxides or metal oxides (such as Ni(OH)2, Co(OH)2, Fe(OH)3, Mn2O3, Mn3O4) to form a composite electrode structure. This composite approach allows the MnO2 component to provide high charge capacity while the metal hydroxide/oxide component enhances cycling stability and storage capabilities, thereby resolving the contradiction between achieving high charge capacity and maintaining reliability.
2Reliability
If modified oxide compositions are developed, then cycling stability is improved, but manufacturing complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-forming the metal hydroxide or metal oxide component before combining it with MnO2 to create the composite electrode. This preliminary preparation of stable metal hydroxide/oxide structures provides a ready-made framework that enhances cycling stability, while allowing the subsequent combination with MnO2 to be performed through relatively simple mixing and processing steps, thus improving reliability without excessive manufacturing complexity.
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 modified oxide compositions demonstrate enhanced cycling stability and capacity retention in rechargeable batteries, making them suitable for electrochemical applications such as electrodes in batteries and supercapacitors.
Implementation Method 1
contacting the starting ABOz composition and the acidic component at a first time and temperature in order to remove at least some of the A and/or B component from the starting ABOz composition
Implementation Method 2
heating the modified ABOz composition to a temperature which is below the phase transition temperature of the modified ABOz composition
Data Source
AI summary
Oxide compositions comprising a modified structure which includes the formula ABOz. The A component may comprise at a cation of least one element selected from the group consisting of Mg, Ca, Sr, Ba, Sc, Y, La, Ce, Pr, Nd, Gd, and Zn, and the B component may comprise a cation of at least one element selected from the group consisting of V, Cr, Mn, Fe, Co, and Ni. Batteries and supercapacitors comprising the oxide compositions of the present disclosure and methods of making the oxide compositions of the present disclosure are also provided.