Nanosized materials are widely applied in lithium-ion battery to improving power/energy performances. However, the low packing density of nanoparticles limits the volumetric capacity of electrodes. Calendering nanoparticle electrodes leads to pore destruction, electrolyte blocking and poor ion transport. This work reports unimpeded ion transport in ultracompact nanoparticle electrodes by nanofluidic additives that provide rapid ion pathways without loss of electrode density. Sub-micron commercial LiFePO₄ particles, as a model cathode material, are deployed to fabricate the nanofluidic-enhanced dense electrodes that show excellent volumetric capacities in liquid and gel polymer electrolytes, which surpass state-of-the-art LiFePO₄ electrodes. This extraordinary performance (303.6 mAh cm⁻³ and 1026.2 Wh L^–1 at 0.06 C) correlates with the conductive nanofluidic network through which lithium ions can move around swiftly. This nanofluidic strategy can be extended to other electroactive nanoparticles in the design of high-capacity compact batteries.

纳米材料广泛应用于锂离子电池，以提高功率/能量性能。然而，纳米颗粒的低堆积密度限制了电极的体积容量。压延纳米粒子电极会导致孔隙破坏、电解质阻塞和离子传输不良。这项工作报告了通过纳米流体添加剂在超紧凑纳米粒子电极中不受阻碍的离子传输，纳米流体添加剂提供了快速的离子通道而不会损失电极密度。亚微米商用 LiFePO ₄颗粒作为模型阴极材料，用于制造纳米流体增强的致密电极，该电极在液体和凝胶聚合物电解质中显示出优异的体积容量，超过了最先进的 LiFePO ₄电极。这种非凡的性能（303.6 mAh cm⁻³和 1026.2 Wh L ^–1 at 0.06 C) 与导电纳米流体网络相关，锂离子可以通过该网络快速移动。这种纳米流体策略可以扩展到高容量紧凑型电池设计中的其他电活性纳米粒子。