Carbon-Coated Supraballs of Randomly Packed LiFePO4 Nanoplates for High Rate and Stable Cycling of Li-Ion Batteries

Virendra Patil, Woong Oh, Jong Won Yoo, Lyongsun Pu, Jong Hyeok Park, Won Sub Yoon, Gi Ra Yi

Research output: Contribution to journalArticle

Abstract

One of the key strategies used to obtain high-rate Li-ion battery is the reduction of the Li-ion path length inside the active materials and the enhancement of the ionic diffusion outside the active materials. It is demonstrated that electrochemical performance can be improved significantly at high C-rates using carbon-coated spherical aggregates or “supraballs” of randomly packed olivine LiFePO4 (LFP) nanoplates as cathode active materials. 258 nm LFP nanoplates with 30 nm thickness are synthesized through a high-temperature solvothermal method, in which short lithium-ion channels are formed perpendicular to the top or bottom planes. These thin nanoplates are formed into carbon-coated “supraballs” through a spray-drying and thermal annealing process, in which nanoplates are not stacked but randomly packed due to relatively fast drying. Internal and external nanoplate ion diffusion is therefore enhanced simultaneously due to the optimal molecular crystalline structure and interparticle pore structures of the nanoplates. Indeed, the initial capacity of the carbon-coated supraballs is 162 mAh g−1 (173.34 mAh cm−3) at 0.1 C and more than 80% is retained (≈130.91 mAh g−1) at 50 C. Furthermore, they offer durable cycling stability (>500 cycles) at 1 C without compromising their capacity.

Original languageEnglish
Article number1900149
JournalParticle and Particle Systems Characterization
Volume36
Issue number7
DOIs
Publication statusPublished - 2019 Jul

Fingerprint

electric batteries
Carbon
drying
cycles
carbon
Ions
ionic diffusion
Olivine
Spray drying
ions
Pore structure
Ion Channels
Lithium
olivine
sprayers
Drying
Cathodes
lithium
cathodes
Annealing

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

Cite this

Patil, Virendra ; Oh, Woong ; Yoo, Jong Won ; Pu, Lyongsun ; Park, Jong Hyeok ; Yoon, Won Sub ; Yi, Gi Ra. / Carbon-Coated Supraballs of Randomly Packed LiFePO4 Nanoplates for High Rate and Stable Cycling of Li-Ion Batteries. In: Particle and Particle Systems Characterization. 2019 ; Vol. 36, No. 7.
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Carbon-Coated Supraballs of Randomly Packed LiFePO4 Nanoplates for High Rate and Stable Cycling of Li-Ion Batteries. / Patil, Virendra; Oh, Woong; Yoo, Jong Won; Pu, Lyongsun; Park, Jong Hyeok; Yoon, Won Sub; Yi, Gi Ra.

In: Particle and Particle Systems Characterization, Vol. 36, No. 7, 1900149, 07.2019.

Research output: Contribution to journalArticle

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