Ilmenite-Derived Electrode Materials for Cost-Effective Battery Storage
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Solution Overview
Problem
Current battery technologies for grid-level energy storage are either too expensive or lack the durability needed to be cost-effective, with lead-acid batteries posing environmental concerns and having low cycle life, while existing alternatives like lithium iron phosphate and aqueous sodium/potassium batteries face challenges in cost-effective manufacturing processes.
Innovation Solution
A method is developed to produce low-cost electrode active materials from ilmenite, involving the processing of titanium and iron to create materials like AaFexM(1-x)(XO4)c, AaTib(XO4)c, AaTibOc, and AaMbFe(CN)6 through steps such as determining elemental content, preparing intermediate mixtures, ball-milling, and sintering, which allows for the production of electrode active materials suitable for sodium/lithium/potassium aqueous batteries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If lead-acid battery is used for energy storage, then cost is reduced, but environmental impact increases and cycle life decreases
Solution Approach 1:
The invention changes the chemical composition parameters of the electrode materials by incorporating specific ratios of iron, titanium, and manganese oxides to achieve both cost-effectiveness and improved cycle life, resolving the contradiction between low cost and reliability
Solution Approach 2:
The invention uses composite electrode materials combining multiple metal oxides (Fe3O4, TiO2, Mn3O4) in specific ratios to create a material that simultaneously achieves low cost, high cycle life, and good electrochemical performance, addressing both cost and reliability requirements
2Reliability
If lithium iron phosphate battery is used, then cycle life is improved, but manufacturing cost increases
Solution Approach 1:
The invention replaces expensive lithium-based materials with cheaper iron, titanium, and manganese oxides that can be sourced from industrial byproducts, achieving similar cycle life performance at significantly lower manufacturing cost
Solution Approach 2:
The invention changes the electrochemical system parameters by using aqueous electrolytes and different electrode material compositions to achieve high cycle life without the high manufacturing costs associated with lithium iron phosphate batteries
3Object-affected harmful factors
If aqueous sodium/potassium battery is used, then environmental friendliness is improved, but manufacturing complexity increases
Solution Approach 1:
The invention uses homogeneous aqueous electrolyte systems with simple salt solutions (Na2SO4, K2SO4) and straightforward electrode processing methods, achieving environmental friendliness while maintaining simple manufacturing processes without complex equipment or procedures
4Ease of manufacture
If ilmenite is used as raw material, then manufacturing cost is reduced, but material purity decreases
Solution Approach 1:
The invention converts the impurity problem of ilmenite into a benefit by using a multi-step purification process that transforms impure raw material into high-purity electrode materials, achieving both low cost and high purity simultaneously
Solution Approach 2:
The invention changes the purity parameters through controlled chemical reactions including dissolution, precipitation, and calcination at specific temperatures to achieve the desired purity level from impure ilmenite while maintaining cost-effectiveness
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
This method enables the production of cost-effective electrode active materials with improved cycle life and reduced environmental impact, addressing the limitations of existing battery technologies by utilizing abundant elements and simpler manufacturing processes.
Implementation Method 1
dissolving the ilmenite in sulfuric acid to form a first mixture
Implementation Method 2
reducing the first mixture using a reducing agent to form a second mixture
Implementation Method 3
crystallizing the first filtrate, and filtering to form a second filtrate and a second retained material, wherein the second retained material is the source material of Fe comprising FeSO4.7H2O crystals
Implementation Method 4
hydrolyzing the second filtrate to form a third mixture
Implementation Method 5
calcinating at least a portion of the third retained material to form titanium dioxide (TiO2)
Implementation Method 6
ball-milling and drying the first intermediate mixture
Implementation Method 7
sintering the first intermediate mixture to form at least one of the electrode active materials
Data Source
AI summary
A method of producing electrode active materials includes generating a source material of titanium (Ti) and a source material of iron (Fe) from an ilmenite, and performing a operation to the source material of Fe and the source material of Ti. The operation includes determining a content of Fe or Ti in the source material of Fe or Ti, preparing an intermediate mixture having the source material of Fe or Ti and other required source materials, ball-milling and drying the intermediate mixture, and sintering the intermediate mixture to form the electrode active materials.