We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Uniform Mesoporous CoCO<sub>3</sub> Nanospindles on Graphite Nanosheets for Highly Efficient Lithium Storage.
- Authors
Su, Liwei; Zhao, Yizhe; Li, Zhemin; Hei, Jinpei; Chen, Huan; Wang, Lianbang; Wang, Yuanhao; Ren, Manman
- Abstract
As anodes for lithium‐ion batteries, CoCO3 has a much higher specific capacity than graphite and can meet the urgent demands of electric vehicles and portable electronics. However, reported CoCO3 anodes are of micrometer‐sized morphology (0.4–10 µm) that severely limits long‐term and rate performances (in particular >2.0 A g−1) due to intrinsically low conductivity and high volume expansion. Mesoporous materials have uniform open mesopores to offer sufficient solid/electrolyte contact, rapid Li+ transport, and large pore volume. However, it is still challenging to prepare uniform mesoporous CoCO3 nanostructures. This work reports a urea–NH4HCO3–ethylene glycol (EG) solvothermal system to fabricate uniform mesoporous CoCO3 nanospindles and concurrently composite with multilayered graphite nanosheets. The obtained mesoporous CoCO3 has a specific surface area of 143.7 m2 g−1, 12.4 times that of commercial CoCO3. The preparation mechanism is studied in‐depth, where urea, NH4HCO3, EG, and crystal water play essential and respective roles. The synergistic effect of the mesopore and graphite nanosheets facilitates long‐term cycling stability (1465 mAh g−1 after 450 cycles at 200 mA g−1 with 101.1% capacity retention) and high‐rate performance (1033 mAh g−1 at 2.0 A g−1). The essential roles of mesopores and graphite nanosheets in boosting the kinetic change are investigated.
- Subjects
GRAPHITE; MESOPOROUS materials; SURFACE area; ELECTRIC vehicles; LITHIUM-ion batteries; ETHYLENE glycol; PYROLYTIC graphite
- Publication
Particle & Particle Systems Characterization, 2020, Vol 37, Issue 7, p1
- ISSN
0934-0866
- Publication type
Article
- DOI
10.1002/ppsc.202000113