LiFePO4/Nano-LLZTO Composite Cathodes for Enhanced Performance of Solid-State Lithium Batteries
Jaturon Kumchompoo, Bo-Huei Yang, Jintara Padchasri, Pinit Kidkhunthod, Jyh-Tsung Lee, Chia-Chen Li
TL;DR
This paper shows that using nano-sized LLZTO particles in LiFePO4 cathodes improves the performance of solid-state lithium batteries by enhancing ion transport and stability.
Contribution
The novelty lies in demonstrating that reducing LLZTO particle size enhances cathode performance in solid-state lithium batteries.
Findings
Nano-LLZTO increases ionic conductivity to 6.48 × 10–5 S cm–1 compared to 1.03 × 10–5 S cm–1 for micro-LLZTO.
The composite cathode achieves 99.6% Coulombic efficiency and 144 mAh g–1 at 1C.
The cathode retains 95% of its initial capacity after 200 cycles at 0.2C.
Abstract
Solid-state lithium batteries (SSLBs) offer improved safety and stability over conventional liquid-electrolyte systems but often suffer from sluggish ion transport and poor interfacial contact within the cathode. To address these limitations, we investigate the incorporation of nanosized Li6.75La3Zr1.75Ta0.25O12 (nano-LLZTO) particles into a LiFePO4 cathode to enhance ionic conductivity and electrochemical performance. Finite element method simulations and experiments reveal that downsizing LLZTO from the microscale to the nanoscale substantially enhances Li+ flux uniformity and ionic conductivity (6.48 × 10–5 S cm–1 vs 1.03 × 10–5 S cm–1), forming more continuous ion-transport networks. The LiFePO4/nano-LLZTO cathode exhibits reduced polarization, higher Coulombic efficiency (99.6%), and superior high-rate capability compared with the microsized LLZTO counterpart, achieving 144 mAh g–1…
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Taxonomy
TopicsAdvancements in Battery Materials · Advanced Battery Technologies Research · Advanced Battery Materials and Technologies