Xu Dandan, Huang Qianqian, Xu Xinxin, Sang Xiaoguang
Department of Chemistry, College of Science, Northeastern University, Shenyang, 110819, P.R. China.
Dalton Trans. 2020 Sep 15;49(35):12441-12449. doi: 10.1039/d0dt01153c.
An Ni-Zn battery is a distinguished member in the family of closed Zn-based batteries due to its ideal power density and voltage. However, when it is employed as a power supply for electric vehicles, its defects in terms of specific capacitance and energy density become obvious. Herein, to resolve this problem, a hybrid battery system was created through a combination of Ni-Zn and Zn-air batteries at the cell level. In a hybrid battery system, oxygen vacancy rich NiO with S,N co-modified mesoporous carbon as a matrix was used as the cathode material. This cathode material showed a high specific capacitance of 202.1 mA h g-1 at 1.0 A g-1. When the current density reduces to 20 A g-1, this value decreases to 130.2 mA h g-1, which implies that 64.4% of specific capacitance was retained. It also exhibits excellent OER and ORR activities. For the hybrid battery system, when the discharge process was carried out at 1 mA cm-2, there were two voltage plateaus at 1.72 and 1.12 V, which originated from Ni-Zn and Zn-air, respectively. In this case, its specific capacitance and energy density reaches 800.3 mA h g-1 and 961 W h kg-1, respectively. The hybrid battery also possesses perfect stability during multi-cycle charge-discharge tests. The construction of this hybrid battery system develops a new road to prepare a power supply device with high performance.
镍锌电池因其理想的功率密度和电压，是封闭式锌基电池家族中的杰出成员。然而，当它用作电动汽车的电源时，其在比电容和能量密度方面的缺陷就变得明显。在此，为了解决这个问题，通过在电池单元层面将镍锌电池和锌空气电池组合，创建了一种混合电池系统。在混合电池系统中，以硫、氮共修饰的介孔碳为基质的富氧空位氧化镍被用作阴极材料。这种阴极材料在1.0 A g-1时显示出202.1 mA h g-1的高比电容。当电流密度降至20 A g-1时，该值降至130.2 mA h g-1，这意味着保留了64.4%的比电容。它还表现出优异的析氧反应和氧还原反应活性。对于混合电池系统，当在1 mA cm-2下进行放电过程时，在1.72 V和1.12 V处有两个电压平台，分别源自镍锌电池和锌空气电池。在这种情况下，其比电容和能量密度分别达到800.3 mA h g-1和961 W h kg-1。该混合电池在多循环充放电测试中也具有完美的稳定性。这种混合电池系统的构建为制备高性能电源装置开辟了一条新道路。
