Leading silicon-based anode material for lithium batteries, SiO material
-
The commercial graphite anode capacity is around 360mAh/g, which is very close to its theoretical specific capacity of 372mAh/g. In comparison, the theoretical specific capacity of silicon materials is very high (Li22Si5 formed at high temperature, corresponding to a capacity of 4200 mAh/g; Li15Si4 formed at room temperature, corresponding to a capacity of 3579 mAh/g; for comparison of volumetric energy density, graphite is 837mAh/cm3, Li15Si4 is 9786mAh/cm3). Compared with other anode materials, the delithiation voltage is also low (~0.5V), only slightly higher than graphite, so silicon-based materials are expected to become the supporting anode materials for high-energy density lithium batteries, with high nickel NCM811/NCA positive electrode for best results.
SiOx belongs to an amorphous structure, and there are amorphous Si, amorphous SiO2 clusters and a boundary layer between SiO phases at the same time. It is generally believed that the following reactions occur during the first electrochemical cycle of silicon oxide:
SiO + Li → 1/4 Li4SiO4+ 3/4 Si (irreversible) (1) Si + Li ↔ Li3.75Si (reversible) (2)
More detailed research shows that the first lithium insertion of silicon oxide will undergo successive SiO2 component continuous lithiation, Si component continuous alloying, Li4SiO4 decomposition and further lithiation, and final lithium deposition. As the degree of lithiation increases, the capacity and first effect of silicon oxide gradually increase.AFT-SiO Unit SiO400 SiO420 SiO450 SiO500 SiO550 SiO600 SiOX064 SiOX265 SiOX125 SiOX131 Particle Size D10 μm 7.5±1.0 7.0±1.0 7.0±1.0 5.0±1.5 4.7±1.5 4.5±1.5 2.2 4.1 4.2 4.1 D50 16±2.0 16±2.0 15±2.0 12.4±2.0 12.0±2.0 11.7±2.0 5.7 6.5 6.5 6.5 D90 29.0±4.0 29.0±4.0 28.0±4.0 23.5±4.0 23.5±4.0 23.5±4.0 8.7 9.3 9.3 9.3 Surface Area m2/g 1.5 1.5 1.5 1.5 2 2 5.1 3.3 3.4 3.5 Tap Density g/cm3 0.9 0.9 0.9 0.9 0.95 0.95 1.11 1.11 1.12 1.13 Moisture Content ppm ≤5000 ≤5000 ≤5000 ≤5000 ≤5000 ≤5000 ≤5000 ≤5000 ≤5000 ≤5000 Ferrum content ppm <50 <50 <50 <50 <50 <50 <50 <50 <50 <50 0.1C Discharge Capacity mAh/g 400 420 450 500 550 600 1502 1539 1358 1359 0.1C First Discharge Efficiency % 91 90.5 88.5 87 85.5 84 70 70 85 90 Note: The above data is AFT measured data, different test equipment and methods will cause the test data to fluctuate
Scanning electron micrograph
SiO and Graphite Composite
Charge and discharge curves
Storage Condition
1、Suggest storage temperature and humidity controlled below 40 ℃ and 60 %RH, respectively, for brandnew; After opening, please use it up as soon as possible.
2、After opening for 1 hour, it is a natural phenomenon for moisture regain, implying that moisture content of powder could be increased to 3000 ppm. Suggest drying it again before use.
Delivery Time:In Stock
