Mesoporous TiO2 Anode Powder for High First-Cycle Efficiency
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Solution Overview
Problem
Existing methods for manufacturing TiO2 particles for batteries face challenges in achieving high capacity and rate performance with minimal losses in the first few cycles, particularly due to the anatase phase's limitations.
Innovation Solution
The method involves forming primary TiO2 nanoparticles, neutralizing the dispersion, spray drying, and calcining to create secondary particles with controlled mesopores and high tap density, resulting in a calcined powder with specific properties for improved battery performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional TiO2 particles are used for battery anodes, then manufacturing is simple, but capacity and first cycle efficiency are limited
Solution Approach 1:
The TiO2 particles are segmented into primary nanoparticles (5-20 nm) that aggregate into secondary particles with controlled mesoporous structures. This segmentation increases the surface area and provides more active sites for lithium insertion, improving capacity and first cycle efficiency while maintaining manageable manufacturing through the spray drying process.
Solution Approach 2:
The invention creates secondary particles with controlled mesopores (2-15 nm) formed by aggregation of primary nanoparticles. The porosity (0.15-0.40 cm³/g) enhances ion transport and electrolyte penetration, improving battery capacity and rate performance while the spray drying method keeps the manufacturing process relatively simple.
2Speed
If high porosity is achieved to improve ion transport, then rate performance increases, but tap density decreases
Solution Approach 1:
The invention applies local quality by creating mesopores specifically within the secondary particles (local porosity) while maintaining high tap density at the bulk level. The mesopores (2-15 nm) are localized channels for fast ion transport, while the overall particle packing achieves high tap density (1.55-1.85 g/cm³) through controlled aggregation of primary nanoparticles.
Solution Approach 2:
The secondary particles are composite structures consisting of aggregated primary TiO2 nanoparticles (5-20 nm) forming a mesoporous network. This composite architecture provides both high porosity for ion transport (0.15-0.40 cm³/g) and high tap density (1.55-1.85 g/cm³) through optimized particle packing, resolving the contradiction between rate performance and quantity.
3Reliability
If primary particle size is reduced to increase surface area, then capacity improves, but manufacturing precision requirements increase
Solution Approach 1:
The spray drying process enables self-service by allowing primary nanoparticles (5-20 nm) to automatically aggregate into secondary particles with controlled mesoporous structures during the drying process itself. This self-organization occurs without requiring precise external control, achieving both high capacity through small primary particle size and manageable manufacturing precision through the self-assembling nature of the process.
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 solution achieves high capacity and good first cycle efficiency with enhanced ion and electron transport, suitable for fast charging and discharging, and reduces manufacturing complexity.
Implementation Method 1
The present invention relates to the manufacture of particles comprising TiO2 using spray drying
Implementation Method 2
drying, and then calcining the powder
Data Source
AI summary
There is disclosed a powder for a Li-ion battery anode and its manufacture, comprising manufacturing a dispersion comprising titanium dioxide primary particles. Thereafter the dispersion comprising primary particles is spray dried or jet milled to obtain spherical secondary particles comprising the primary particles. Thereafter the powder are calcined so that the primary particles are fused together to form the secondary particles. In addition to the method the particles, a battery anode comprising the particles, a battery cell comprising the anode, a battery pack comprising the battery cells, a battery pack including a control system are provided. Advantages include high capacities and performance with very low losses in the first few cycles for the batteries. Improved control of the particle properties is possible.