Lightweight and highly conductive flexible films are attractive for a wide range of devices, especially replacing heavy metal-based current collectors, which can greatly reduce the weight of inactive materials in batteries and further enhance the energy density of energy storage devices. In this study, we first report a graphite film (GF) with ultralight weight (3.44 mg cm⁻²), high electrical conductivity (up to 1.07*10⁶ S m⁻¹), fast heat transport and excellent anti-wrinkle (300 times folding) properties. When used as current collector of half-cells, GF can enhance the rate property and long cycle durability of Li-ion batteries (LIBs) by reducing the contact resistance between active materials and current collector and buffering the stress during charge/discharge. By further employing GF current collectors to completely replace the Al and Cu foils at both sides of full cells, the electrode energy density of LiCoO₂‖Csi cell (4 mAh cm⁻²) is greatly boosted from 260 Wh kg⁻¹ to 332 Wh kg⁻¹. Moreover, such a GF film with excellent wrinkle resistance enables it to be used in flexible pouch cells with stable power output during various bending and distorting.

轻质，高导电性的柔性薄膜对于各种设备都很有吸引力，尤其是代替重金属基集电器，这可以大大减少电池中惰性材料的重量，并进一步提高能量存储设备的能量密度。在这项研究中，我们首先报道了具有超轻重量（3.44 mg cm ^-2），高电导率（高达1.07 * 10 ⁶  S m ^-1）的石墨膜（GF）），快速的热传递和出色的抗皱（折叠300倍）性能。当用作半电池的集电器时，GF可以通过降低活性物质与集电器之间的接触电阻并缓冲充电/放电过程中的应力来提高锂离子电池（LIB）的倍率性能和长周期耐久性。通过进一步用人GF集电体完全取代在全电池的两侧的Al和Cu箔的LiCoO的电极的能量密度₂ ‖Csi细胞（4毫安厘米^-2）大大从260瓦时千克升压^-1至332瓦时千克^-1。此外，具有优异的抗皱性的这种GF膜使得其可以用于在各种弯曲和变形期间具有稳定的功率输出的柔性袋式电池中。