Zhang Weicai, Lan Chaowen, Xie Xiuhong, Cao Qiaoying, Zheng Mingtao, Dong Hanwu, Hu Hang, Xiao Yong, Liu Yingliang, Liang Yeru
College of Materials and Energy, South China Agricultural University, Guangzhou 510642, PR China.
Guangdong BioMax Si&F New Material Co., Ltd., Guangzhou 511340, PR China.
J Colloid Interface Sci. 2019 Jun 15;546:53-59. doi: 10.1016/j.jcis.2019.03.043. Epub 2019 Mar 14.
Sodium-ion batteries are promising next-generation electrical-energy-storage devices due to the relative low cost, and the natural abundance of sodium resources. Yet developmental anodes in sodium-ion batteries such as carbonaceous materials have adagio sodium ion diffusion kinetics, huge volume expansion, poor rate performance and cycle stability. Herein, we report a high-performance sodium ion storage anode material, i.e., a unique nanonetwork-structured carbon (NNSC) with a valuable hollow nanosphere as network unit by developing a facile, efficient and post-treatment-free strategy. The as-constructed NNSC exhibits a three-dimensional interconnected hierarchical porous network and a luxuriant accessible surface area, which greatly enhance sodium ion transport and storage. Thus, the obtained NNSC demonstrates excellent sodium ion storage performance, including a high capacity of 250 mA h g, good rate capability, and ultra-long-term cycle life up to 9000 cycles. Such attractive capabilities could accelerate the application of sodium-ion batteries in large-scale energy storage.
钠离子电池因其相对较低的成本以及钠资源的天然丰富性，成为很有前景的下一代电能存储设备。然而，钠离子电池中的负极材料，如碳质材料，存在钠离子扩散动力学缓慢、体积膨胀大、倍率性能和循环稳定性差等问题。在此，我们报道了一种高性能的钠离子存储负极材料，即一种独特的纳米网络结构碳（NNSC），它通过开发一种简便、高效且无需后处理的策略，以有价值的空心纳米球作为网络单元。所构建的NNSC呈现出三维相互连接的分级多孔网络以及丰富的可及表面积，这极大地增强了钠离子的传输和存储。因此，所获得的NNSC展现出优异的钠离子存储性能，包括250 mA h g的高容量、良好的倍率性能以及高达9000次循环的超长期循环寿命。这些吸引人的性能能够加速钠离子电池在大规模储能中的应用。
