The utilization of renewable energies has become increasingly urgent for the sustainable development of our society. Energy storage systems are essential in order to efficiently use these energies. Sodium-ion batteries (SIBs) show bright prospect in the application for energy storage markets due to the potential low cost originating from unlimited sources and wide distribution of Na. However, the anode remains a great challenge in the industrialization of SIBs. Hard carbon holds the most promising future among all reported anodes; however, there are still two main shortcomings such as high cost and low initial coulombic efficiency, which limit its application. Here, we report a hard carbon material derived from an abundant and abandoned biomass of corn cobs (HCC) using a simple carbonization method. The HCC shows excellent sodium storage performance with a reversible capacity of ca. 300mA h g(-1), a high initial coulombic efficiency of 86% and good cycling stability. A prototype sodium-ion battery was prepared to prove the application prospect using HCC1300 as the anode and Na-0.9[Cu0.22Fe0.30Mn0.48]O-2 as the cathode, exhibiting a high energy density of 207 W h kg(-1) and a long cycle life. These excellent properties demonstrate that HCC is a potential candidate as an anode material for sodium-ion battery application.
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机译:为了社会的可持续发展,利用可再生能源变得越来越紧迫。能量存储系统对于有效利用这些能量至关重要。钠离子电池(SIB)在储能市场的应用中显示出广阔的前景,这归因于无限来源和广泛分布的Na带来的潜在低成本。然而,阳极在SIB的工业化中仍然是巨大的挑战。在所有报道的阳极中,硬碳拥有最有希望的未来。然而,仍然存在两个主要缺点,例如成本高和初始库仑效率低,这限制了其应用。在这里,我们报告了一种使用简单的碳化方法从丰富而废弃的玉米芯(HCC)生物质中衍生出的硬碳材料。 HCC显示出极好的钠储存性能,可逆容量约为。 300mA h g(-1),86%的高初始库仑效率和良好的循环稳定性。制备了钠离子电池原型,以HCC1300为阳极,Na-0.9 [Cu0.22Fe0.30Mn0.48] O-2作为阴极,证明了其应用前景,其高能量密度为207 W h kg(- 1)循环寿命长。这些优异的性能表明,HCC可以作为钠离子电池应用的负极材料。
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