It is a great challenge to engineer thick or bulk electrodes with well-maintained rate performance, since their charge-transport kinetics are severely worsened at large current densities. Here, high-power thick cathode of Li-ion batteries has been built based on mesoporous lithium vanadium phosphate interweaved with carbon nanotube nest. A facile yet effective synthesis method based on aerosol-assisted spray process followed with high-temperature calcination has been developed to synthesize such nanocomposite. During spraying process, high-aspect-ratio carbon nanotubes are interweaved into lithium vanadium phosphate and form long-range conductive nest. This structure provides efficient charge transport for the active material, even in their thick electrodes. To verify this, 30 and 160 μm binder-free electrodes have been fabricated. The results show that the 160 μm electrode can reach comparable rate performance to that of 30 μm from the rate of 0.2–10 C. The discharge capacities at 10 C for 30 and 160 μm electrodes are 130 and 122 mAh g^–1, respectively, which are 98% and 92% of theoretical capacity of lithium vanadium phosphate. Also, a capacity retention over 96% is still retained after 1000 cycles at 20 C, exhibiting good cycling stability. Hence, the designed nanocomposite is promising for fast charging/discharging of batteries. The synthetic method is scalable, and can be used for synthesis of other electrochemical active materials.

中文翻译：

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高充放电速率下厚磷酸锂钒锂电极中的理论容量接近

设计具有良好速率性能的厚电极或块状电极是一个巨大的挑战，因为它们的电荷传输动力学在大电流密度下会严重恶化。在此，锂离子电池的高功率厚阴极是基于中孔磷酸锂钒与碳纳米管巢隙交织而成的。已经开发了一种基于气溶胶辅助喷雾工艺并随后高温煅烧的简便而有效的合成方法来合成这种纳米复合材料。在喷涂过程中，高纵横比的碳纳米管交织到磷酸钒锂中并形成长距离导电巢。这种结构即使在其厚电极中也为活性材料提供了有效的电荷传输。为了验证这一点，已经制造了30和160μm的无粘合剂电极。分别为^–1，分别是磷酸锂钒理论容量的98％和92％。而且，在20℃下1000次循环后仍保持超过96％的容量保持率，表现出良好的循环稳定性。因此，设计的纳米复合材料有望用于电池的快速充电/放电。该合成方法是可扩展的，并且可以用于合成其他电化学活性材料。