Hu Jing, Yue Meng, Zhang Huamin, Yuan Zhizhang, Li Xianfeng
Division of Energy Storage, Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian, 116023, P. R. China.
University of Chinese Academy of Sciences, Beijing, 100049, P. R. China.
Angew Chem Int Ed Engl. 2020 Apr 20;59(17):6715-6719. doi: 10.1002/anie.201914819. Epub 2020 Mar 5.
The capability to maintain a constant system temperature is vital in nature, since it endows the system with enhanced lifetime. This trait also works for zinc-based batteries, because their cycle-life is limited by notorious zinc dendrite/accumulation, which are highly affected by the inhomogeneous distribution of temperature on electrode and relatively low mechanical strength of membrane. Herein, boron nitride nanosheets (BNNSs) with high mechanical strength serving as heat-porter are introduced onto a porous substrate to enable uniform deposition of zinc and further a zinc-based flow battery with long-cycle life. The results indicate that BNNSs can effectively adjust the deposited zinc from needle-like to French fries-like morphology, thus affording the battery with a stable performance for nearly 500 cycles at 80 mA cm . Most importantly, an energy efficiency of above 80 % can be obtained even at 200 mA cm , which is by far the highest value ever reported among zinc-based flow batteries.
在自然界中，维持系统温度恒定的能力至关重要，因为它能延长系统的使用寿命。这一特性对锌基电池同样适用，因为其循环寿命受到臭名昭著的锌枝晶/堆积的限制，而电极上温度的不均匀分布和隔膜相对较低的机械强度对锌枝晶/堆积有很大影响。在此，将具有高机械强度的氮化硼纳米片（BNNSs）作为热载体引入多孔基底上，以实现锌的均匀沉积，并进一步制备出具有长循环寿命的锌基液流电池。结果表明，BNNSs能有效地将沉积的锌从针状形态调整为薯条状形态，从而使电池在80 mA cm 下能稳定运行近500次循环。最重要的是，即使在200 mA cm 时也能获得高于80%的能量效率，这是迄今为止锌基液流电池中报道的最高值。
