Description
Application Expansion Beyond Lithium-ion Batteries
Metal / Alloy
Powders
Powders
- Particle strength directly affects sintering density and mechanical properties of the finished product.
- Strength testing of metal particles optimizes powder fluidity and compactibility.
Ceramic
Powders
Powders
- Particle strength before sintering affects the final densification.
- Capable of capturing the fracture threshold of brittle materials.
Composite
Materials
Materials
- Capable of capturing the fracture threshold of brittle materials.
- Comprehensive mechanical property characterization of materials.
Excipients /
Catalysts
Catalysts
- Particle strength affects the hardness and disintegration characteristics of drugs/catalysts.
- Regulates solubility/fluidity, and aids in forming sustained or controlled-release systems.
1. Product Introduction
1.1 Background
Testing the crushing strength of battery material particles can be used to evaluate the pressure resistance of the material and guide the rolling process. Materials with high mechanical strength will have better subsequent cycle stability.
1.2 Testing Object
Lithium battery cathode and anode electrode materials(Cathode: polycrystalline ternary; lithium-rich material; Anode: silicon-based, hard carbon, etc.; solid electrolyte)
1.3 Test Particle Size
Single particle size: 5~50 μm
1.4 Equipment Composition
-
Core Function: Particle compression with force-displacement curve recording — identifying the failure point: the force at which the particle is crushed (fails).
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Functional Modules: Integrated control of displacement and pressure via software; real-time particle imaging and video recording.
2. Equipment Features
3. IEST Innovative Solutions
3.1 Testing Method
The powder is dispersed into liquid and dropped onto a glass slide. A single particle is located under an optical microscope, and the indenter is controlled to descend at a constant speed. Force-displacement curves are acquired during particle compression to calculate single particle mechanical properties.
3.2 Single Particles of Different Material Systems Exhibit Distinct Compression Behaviors
- Particle Crushing Point, Compression Displacement, Curve Steps & Plateaus, Collapse Process, Disintegration/Fragmentation State, Overall Curve Distribution Profile…
3.3 Test Parameters
- Magnification: up to 1200 times;
- Pressure test range: 0-100 mN;
- Pressure test accuracy: ±0.1 mN;
- Minimum displacement unit: 10 nm;
- Data collection frequency: 1000HZ;
- Comply with national standard GB/T 43091-2023″Powder Compressive strength Test Method”
Applications
1. Cathode: Lithium-rich Manganese-based Layered Oxides (LLOs)
- The coated LLOs exhibits superior pressure resistance, which corresponds to better structural stability and higher capacity retention after cell cycling.
- Single-particle crush measurements reveal the intrinsic relationship between mechanical properties and electrochemical stability in cathode materials at the microscale. This approach not only provides direct assessment criteria for evaluating and screening high-performance materials, but also drives optimization of surface modification strategies and construction of battery lifetime prediction models through quantitative, high-precision testing methodologies. It serves as a critical bridge connecting material design with practical applications.
2. Anode Material-SiC
- Two silicon-carbon materials with different electrode compaction.
- Comparison of crushing force distribution: A>B.
- Analysis of stress-displacement curves: Sample A exhibits initialmicro-crackingfollowed by complete collapse, while sample B expe-riences direct structural collapse and fragmentation.
- Comparison of Disintegration States: after fracturing, all three groups disintegrate into fine granular states.
2.1 Two Different Pure Carbons
The compressive resistance of particle level C1 is stronger. Corresponding to the powder end, C1 has a higher compression modulus than C2, with both maximum deformation and irreversible deformation smaller than C2.
2.2 Three Different Carbon-Silicon Materials
SC-3 has weaker compressive strength of its particles, resulting in significantly larger maximum deformation and irreversible deformation when the powder is compressed compared to theother two materials.
3. Ternary Cathode Material-NCM811
Case 1：
- Ternary cathode materials A1 and A2 are sintered from the same precursor but undergo different sintering processes, with both exhibiting a particle size D50 of 18 μm.
- A2 demonstrates superior compressive strength compared to A1, indicating that modifying the sintering process can enhance material hardness. The single-particle mechanical characterization method provides valuable guidance for optimizing sintering parameters.
Case 2：
- B1 and B2 are sintered from different precursors, both with a particle size D50 of 9.5 μm.
- They exhibit differences in: particle fracture mechanisms; powder compaction behavior; and coin cell cycling performance.
4. Sulfide Solid Electrolytes
- Samples ①, ②, and ③ represent sulfide samples synthesized through different preparation routes.
- Different preparation processes result in varying compressive resistance (compressive strength) of the prepared sulfide particles.
5. Non-battery Application: Polystyrene Microspheres
Polystyrene microspheres of different types exhibit significant variations in compressive properties, deformation mechanisms, and fracture behaviors. These distinct characteristics determine their respective application scenarios.
Video
Specifications
| Model | SPFT1000 | SPFT2000 |
|---|---|---|
| Test Parameters | Displacement, Force | |
| Test Range | Displacement: 0-75 μm; Force: 0-100 mN / 500 mN | |
| Test Resolution | Displacement Resolution: 1 nm; Force Resolution: 0.01 mN / 0.05 mN | |
| Stress-Displacement Curve | ● | ● |
| Particle Image Observation | ● | ● |
| Automatic Pressing Control | ● | ● |
| Fully Automated Software | ● | ● |
| Automated Translation Stage | / | ● |
| Automatic Indenter Cleaning | / | / |
| Glovebox | / | / |
| Specifications | Equipment Dimensions (W×D×H): 750 mm × 550 mm × 600 mm Equipment Weight: 80 kg Equipment Power: 400 W |
Equipment Dimensions (W×D×H): 750 mm × 550 mm × 600 mm Equipment Weight: 80 kg Equipment Power: 500 W |
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IEST Single Particle Property Testing System
