Pulse-assisted fluidization was developed for the fluidization of nanoparticles at high-temperature processes (eg, above 600°C, depending on the material of interest). The technique was employed for carbon coating of lithium iron phosphate (LFP) nanoparticles with a gas-phase carbon precursor (ie, propylene) through chemical vapour deposition (PAFB-CVD). LFP has been extensively investigated as an environmentally friendly and cost-effective cathode material of rechargeable lithium-ion batteries. LFP nanoparticles of this research were, in fact, cohesive secondary particles of Geldart's group C. The CVD tests were carried out at temperatures between 600°C-750°C. Uniform layers of carbon were deposited on the surface of LFP nanoparticles with a thickness less than 10 nm while particles were not sintered under high temperature operations. Also, the generated C-LFP material held a superior electrical conductivity of 10¹⁰ times more than the conductivity of uncoated raw LFP; it also featured a significant enhancement of discharge capacity despite the considerable delay between the production of raw LFP nanoparticles and the CVD process.

中文翻译：

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纳米粒子的脉冲辅助流化：磷酸铁锂材料案例

脉冲辅助流化是为在高温过程（例如，高于 600°C，取决于感兴趣的材料）下流化纳米颗粒而开发的。该技术用于通过化学气相沉积（PAFB-CVD）用气相碳前体（即丙烯）对磷酸铁锂（LFP）纳米颗粒进行碳涂层。LFP 作为一种环保且具有成本效益的可充电锂离子电池正极材料已被广泛研究。本研究的 LFP 纳米粒子实际上是 Geldart 的 C 组粘性二次粒子。 CVD 测试在 600°C-750°C 之间的温度下进行。均匀的碳层沉积在厚度小于 10 nm 的 LFP 纳米颗粒表面，而颗粒在高温操作下未烧结。还，电导率是未包覆的原始 LFP 的¹⁰倍以上；尽管原始 LFP 纳米粒子的生产和 CVD 工艺之间存在相当大的延迟，但它的放电容量也显着提高。