A Simple Aqueous Battery with Potential for Scalable Energy Storage Based on MnO2 Deposition at the Cathode and a Quinoid‐Modified Activated Carbon Anode,ChemElectroChem

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A Simple Aqueous Battery with Potential for Scalable Energy Storage Based on MnO2 Deposition at the Cathode and a Quinoid‐Modified Activated Carbon Anode
ChemElectroChem ( IF 3.5 ) Pub Date : 2020-06-15 , DOI: 10.1002/celc.202000481
Yongchuan Liu _{1,

2} , Junhong Lin ₁ , Xiaofei Miao ₂ , Yuanqiang Chen ₁ , Xiangxin Zhang ₁ , Sujing Chen ₁ , Chengwei Chen ₁ , Wei Wang _{1,

2} , Yining Zhang _{1,

2}

Affiliation

Searching for new materials and battery architecture is highly essential for developing scalable energy storage systems with good reliability, low cost, long cycle life, and high power density. Here, we report the fabrication of a simple and cheap aqueous battery with potential for low‐cost energy storage. In this battery, a quinoid‐modified activated carbon (AC‐AQS) electrode is adopted as the anode and a porous carbon felt is exploited as the current collector in the cathode for reversible MnO₂ deposition (MnO₂‐C) from Mn²⁺ in the electrolyte. This MnO₂‐C/AC‐AQS battery delivers an outstanding power density (4.4 kW kg⁻¹), excellent cycling stability (99.9 % of the maximum discharge capacity is maintained after 10 000 cycles), and limited self‐discharging. A maximum energy density of 102.5 Wh kg⁻¹ under the charging capacity of 1.2 mAh cm⁻² is achieved. Moreover, owing to the ultrafast redox kinetics of cathode and anode, it can be charged to 0.8 mAh cm⁻² within 57.6 s, demonstrating excellent rate capability.

中文翻译：

一个简单的水电池，具有潜在的可扩展能量存储能力，基于阴极处的MnO2沉积和醌型改性的活性炭阳极

对于开发具有良好可靠性，低成本，长循环寿命和高功率密度的可扩展储能系统，寻找新材料和电池架构至关重要。在这里，我们报告了一种简单且廉价的水性电池的制造，该电池具有低成本的能量存储潜力。在此电池中，采用了醌型活性炭（AC-AQS）电极作为阳极，并利用多孔碳毡作为阴极中的集电器，以从Mn ²⁺进行可逆MnO ₂沉积（MnO ₂ -C）。在电解质中。这款MnO ₂ ‐C / AC‐AQS电池具有出色的功率密度（4.4 kW kg ^-1），出色的循环稳定性（10000次循环后可维持最大放电容量的99.9％）和有限的自放电。在1.2mAh cm ^-2的充电容量下实现了102.5Wh kg ^-1的最大能量密度。此外，由于阴极和阳极的超快氧化还原动力学，可以在57.6 s内将其充电至0.8 mAh cm ^-2，显示出出色的速率能力。

更新日期：2020-07-06

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