Abstract The efficient manufacture of electrodes with high volumetric capacity is crucial for the rechargeable batteries for application in limited space. Hot isostatic pressing (HIP) of LiFePO4 (LFP) cathodes using a pressure of 240 MPa at 90 C is very effective for enhancing volumetric capacity. After HIP treatment, LFP cathodes can reach a density of 2.62 g cm−3, and achieve a volumetric capacity of 362 mAh cm−3, which is about twice as high as that of the conventional LFP cathodes. Especially, under the drive of isostatic pressure, the electrolyte readily infiltrate the voids among LFP particles, facilitating Li ion diffusion. LFP cathodes with the pre-infiltrated electrolyte exhibit superior rate capability and cycle performance, which maintain a volumetric capacity of 188 mAh cm−3 after 200 cycles at 10 C.

中文翻译：

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通过热等静压提高 LiFePO4 正极的体积容量

摘要 高容量电极的高效制造对于在有限空间内应用的可充电电池至关重要。在 90 C 下使用 240 MPa 的压力对 LiFePO4 (LFP) 正极进行热等静压 (HIP) 对提高体积容量非常有效。经过HIP处理后，LFP正极的密度可以达到2.62 g cm-3，体积容量达到362 mAh cm-3，约为传统LFP正极的两倍。特别是在等静压驱动下，电解液容易渗入 LFP 颗粒之间的空隙，促进锂离子扩散。具有预渗透电解质的 LFP 正极表现出优异的倍率性能和循环性能，在 10 C 下循环 200 次后仍保持 188 mAh cm-3 的体积容量。