Titanium Carbonate Precursors for Homogeneous Battery Cathodes
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Solution Overview
Problem
Current methods for preparing secondary battery electrode materials, particularly those involving titanium, often result in non-homogeneous distribution of titanium, leading to suboptimal material properties such as cycling stability and energy storage efficiency.
Innovation Solution
A method involving the co-precipitation of titanium and other metal ions from an aqueous solution using titanyl sulfate (TiOSO4) with a carbonate solution, ensuring homogeneous distribution of titanium within the metal carbonate structure, eliminating the need for chelating agents and achieving improved material properties without particle enlargement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional mixing methods (wet or dry mixing, co-precipitation) are used to prepare multi-element electrode materials, then the elements can be mixed together, but titanium cannot be homogeneously distributed in the solid material
Solution Approach 1:
The invention changes the chemical form of titanium from conventional salts to titanyl sulfate (TiOSO4), which enables homogeneous distribution during carbonate precipitation. This parameter change in the chemical state of titanium allows it to be uniformly incorporated into the solid material structure without requiring complex mixing machinery or extensive optimization of mixing parameters.
Solution Approach 2:
The invention uses carbonate precipitation as an intermediary process that facilitates homogeneous mixing of titanium with other metal elements. The carbonate solution acts as a mediator that simultaneously precipitates multiple metal ions including titanium from TiOSO4, achieving atomic-level mixing that is difficult to obtain through direct mechanical mixing of raw materials.
2Manufacturing precision
If chelating agents are used to achieve homogeneous mixing of metal elements, then mixing homogeneity improves, but process complexity and safety hazards increase
Solution Approach 1:
The invention extracts and removes chelating agents from the co-precipitation process while maintaining homogeneous mixing capability. By using TiOSO4 as the titanium source, the process achieves effective homogeneous distribution of all metal elements without requiring any chelating agents, thereby simplifying the process and eliminating associated safety and environmental concerns.
Solution Approach 2:
The invention replaces expensive and potentially hazardous chelating agents with a simple, inexpensive, and safe alternative approach using TiOSO4 and carbonate precipitation. This substitution eliminates the need for complex chelating agent handling, recycling, and disposal systems, making the process more economically viable and environmentally friendly.
3Ease of manufacture
If solid state synthesis is used to prepare electrode materials, then the process is simple, but homogeneous distribution of titanium is difficult to achieve
Solution Approach 1:
The invention performs preliminary chemical preparation by dissolving all metal elements including titanium (from TiOSO4) in aqueous solution before precipitation. This preliminary action ensures that titanium is already in a uniformly distributed state in the solution phase before the solid material forms, overcoming the mixing limitations of solid state synthesis while maintaining process simplicity.
Solution Approach 2:
The invention replaces mechanical mixing methods with chemical solution-based mixing. Instead of using mechanical energy to mix solid powders, the process uses chemical dissolution and precipitation to achieve homogeneous distribution of titanium and other metals at the molecular level, resulting in superior mixing homogeneity.
4Reliability
If titanium is introduced into positive electrode materials to improve cycling stability, then long term stability improves, but homogeneous distribution becomes non-trivial
Solution Approach 1:
The invention changes the chemical parameter of titanium source from conventional salts to TiOSO4, which fundamentally alters the precipitation behavior and enables homogeneous distribution. This parameter change directly addresses the challenge of achieving uniform titanium distribution, thereby ensuring consistent cycling stability without requiring complex process controls or additional processing steps.
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 approach ensures titanium is evenly distributed on a nanoscale within the solid material, enhancing the material's long-term cycling stability and energy storage capabilities, while avoiding the complexities and hazards associated with chelating agents, and producing spherical particles suitable for battery applications.
Implementation Method 1
The co-precipitation of Mn, Ni and Co is well-known. The addition of small amounts of other transition metals, such as e.g. Fe, Cu, V, Ti, has been described to a lesser degree.
Implementation Method 2
it has turned out that a precipitation route where the metal constituents of battery material are precipitated as carbonate precursor has been considerably more advantageous than other preparation routes
Data Source
AI summary
The invention relates to a method for the precipitation of a solid material, where the method comprises: providing an aqueous metal ion solution, said metal ion solution comprising TiOSO4 and metal ions of a metal M, where M is one or more of the elements: Mg, Co, Cu, Ni, Mn, Fe; providing an aqueous carbonate solution; and mixing said aqueous metal ion solution and said aqueous carbonate solution thereby providing a solid material comprising titanium and a metal carbonate comprising said metal(s) M, where the titanium is homogeneously distributed within the solid material. The invention also relates to a solid material, a method of preparing a positive electrode material for a secondary battery from the solid material and the use of the solid material as a precursor for the preparation of a positive electrode material for a secondary battery.