To improve the energy density of the batteries, constructing electrode structure should also be considered besides developing high specific capacity electrode materials. As the active material loading increases, the electrode rate performance worsens due to the long distance of electron transport and ion diffusion. This study proposes a simple and effective strategy to construct a high-load LiFePO₄ electrode with excellent rate performance by using a double-layer structure. The bottom layer with more conductive additives forms a rich conductive network to improve the ability of electronic collection, the top layer with fewer conductive additives increases the porosity to facilitate ion diffusion. The capacity of the double-layer electrode (active material loading 11.4 mg cm⁻²) with imparity distribution of conductive additives achieves 98 mAh g⁻¹ at 425 mA g⁻¹ (2.5C). However, the capacity of the single-layer electrode is zero even at a lower loading (7.1 mg cm⁻²). The vertical imparity distribution of conductive additives in the double-layer structure can reduce the polarization and maintain the excellent rate performance of the high-load electrode. This strategy can be used not only in lithium-ion batteries but also for other energy storage systems possibly.

为了提高电池的能量密度，除了开发高比容量的电极材料外，还应考虑构建电极结构。随着活性材料负载量的增加，由于电子传输和离子扩散距离长，电极倍率性能恶化。本研究提出了一种简单有效的策略，通过双层结构构建具有优异倍率性能的高负载 LiFePO _4电极。底层导电添加剂较多，形成丰富的导电网络，提高电子收集能力，顶层导电添加剂较少，增加孔隙率，有利于离子扩散。双层电极的容量（活性材料负载量 11.4 mg cm ^-2) 具有不均匀分布的导电添加剂在 425 mA g ^-1 (2.5C)时达到 98 mAh g ^{-1 。然而，即使在较低负载（7.1 mg cm -2}）下，单层电极的容量也为零。双层结构中导电添加剂的垂直杂质分布可以减少极化并保持高负载电极的优异倍率性能。这种策略不仅可以用于锂离子电池，还可以用于其他储能系统。