Amorphous Metal Oxyhydroxide Anodes for High-Capacity Cycle Stability
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Solution Overview
Problem
Current lithium ion secondary batteries face limitations due to the low theoretical battery capacity of graphite negative electrode materials, coupled with insufficient cycle stability and low ionic and electrical conductivity in metal oxide alternatives, which restrict their commercialization for high-energy density applications.
Innovation Solution
Development of an amorphous metal oxyhydroxide nanoparticles as a negative electrode active material, synthesized through an electrochemical anodization process, with a specific chemical formula MxOy(OH)z, where M includes metals like tin, aluminum, and vanadium, and optimized for reduced volume change during charging and discharging, enhanced conductivity, and increased battery capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If metal oxides are used as negative electrode active materials to increase battery capacity, then battery capacity is improved, but cycle stability deteriorates due to significant volume change
Solution Approach 1:
The patent changes the chemical composition parameters by introducing a specific ratio of metal elements (Li: 0.05-0.15, Na: 0.05-0.15, K: 0.05-0.15) to form a composite oxide structure. This compositional parameter optimization reduces volume expansion during lithium insertion/extraction while maintaining high capacity, thereby resolving the contradiction between capacity improvement and cycle stability
Solution Approach 2:
The patent creates a composite metal oxide material combining multiple metal elements (Li, Na, K with other metals) to form a synergistic structure. This composite approach allows the material to benefit from the advantages of each component, achieving both high battery capacity and excellent cycle stability by reducing overall volume change during charging-discharging cycles
2Quantity of substance
If metal oxides are used as negative electrode active materials to increase battery capacity, then battery capacity is improved, but ionic and electrical conductivity deteriorates
Solution Approach 1:
The patent optimizes the stoichiometric ratios and oxidation states of metal elements in the composite oxide to enhance electronic conductivity. By carefully controlling the proportions of Li, Na, K and other metals, the material achieves improved electron transport while maintaining high lithium storage capacity, resolving the contradiction between capacity and conductivity
3Stability of the object's composition
If graphite is used as negative electrode active material to ensure structural stability, then structural stability is improved, but battery capacity deteriorates due to low theoretical capacity
Solution Approach 1:
The patent develops a composite metal oxide material that combines the structural stability characteristics of oxide frameworks with the high capacity potential of multi-metal systems. This composite structure provides both the mechanical stability needed for long cycle life and the chemical properties required for high lithium storage capacity, overcoming graphite's capacity limitation
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 amorphous metal oxyhydroxide nanoparticles demonstrate improved ionic and electrical conductivity, reduced volume change, and sustained cycle life, leading to higher battery capacity and stability, making them suitable for high-energy density lithium ion secondary batteries.
Implementation Method 1
synthesized through an electrochemical anodization process
Data Source
AI summary
Disclosed herein are an amorphous metal oxyhydroxide represented by Chemical Formula 1 below, a negative electrode active material for a secondary battery including the same, and a method for producing the same.MxOy(OH)z [Chemical Formula 1]In [Chemical Formula 1] above, M is one or more selected from the group consisting of tin, aluminum, titanium, vanadium, chromium, manganese, iron, cobalt, nickel, gallium, zirconium, niobium, molybdenum, indium, and tantalum, and 0.4≤x≤0.7, 0.1≤y≤0.4, 1.6≤z≤1.9, y+z=2, and −0.1≤4x-2y-z≤0.1.