Rational Design of Hierarchically Open-Porous Spherical Hybrid Architectures for Lithium Ion Batteries
[2];
- Sungkyunkwan Univ. (SKKU), Jangangu, Suwon (Korea). School of Chemical Engineering
- Sungkyunkwan Univ. (SKKU), Jangangu, Suwon (Korea). School of Chemical Engineering; Brookhaven National Lab. (BNL), Upton, NY (United States). Chemistry Division
- Univ. of Illinois, Urbana-Champaign, IL (United States). Frederick Seitz Materials Research Lab., Beckman Inst. for Advanced Science and Technology, Dept. of Materials Science and Engineering
- Pohang Accelerator Lab., Pohang (Republic of Korea). Beamline Research Division
- Brookhaven National Lab. (BNL), Upton, NY (United States). Chemistry Division
- Univ. of Illinois, Urbana-Champaign, IL (United States). Frederick Seitz Materials Research Lab., Beckman Inst. for Advanced Science and Technology, Dept. of Materials Science and Engineering
Abstract Controlling the internal microstructure and overall morphology of building blocks used to form hybrid materials is crucial for the realization of deterministically designed architectures with desirable properties. Here, integrative spray‐frozen (SF) assembly is demonstrated for forming hierarchically structured open‐porous microspheres (hpMSs) composed of Fe 3 O 4 and reduced graphene oxide (rGO). The SF process drives the formation of a radially aligned microstructure within the sprayed colloidal droplets and also controls the overall microsphere morphology. The spherical Fe 3 O 4 /rGO hpMSs contain interconnected open pores, which, when used as a lithium‐ion battery anode, enables them to provide gravimetric and volumetric capacities of 1069.7 mAh g −1 and 686.7 mAh cm −3 , much greater than those of samples with similar composition and different morphologies. The hpMSs have good rate and cycling performance, retaining 78.5% capacity from 100 to 1000 mA g −1 and 74.6% capacity over 300 cycles. Using in situ synchrotron X‐ray absorption spectroscopy, the reaction pathway and phase evolution of the hpMSs are monitored enabling observation of the very small domain size and highly disordered nature of Fe x O y . The reduced capacity fade relative to other conversion systems is due to the good electrical contact between the pulverized Fe x O y particles and rGO, the overall structural integrity of the hpMSs, and the interconnected open porosity.
- Research Organization:
- Brookhaven National Laboratory (BNL), Upton, NY (United States)
- Sponsoring Organization:
- USDOE Office of Energy Efficiency and Renewable Energy (EERE), Vehicle Technologies Office (EE-3V); USDOE
- Grant/Contract Number:
- SC0012704; DE‐SC0012704
- OSTI ID:
- 1485779
- Alternate ID(s):
- OSTI ID: 1488623
- Report Number(s):
- BNL-209738-2018-JAAM
- Journal Information:
- Advanced Energy Materials, Vol. 9, Issue 6; ISSN 1614-6832
- Publisher:
- WileyCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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