Engineering Fast Ion Conduction and Selective Cation Channels for a High‐Rate and High‐Voltage Hybrid Aqueous Battery |
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| Authors: | Chunyi Liu Xusheng Wang Wenjun Deng Chang Li Prof Jitao Chen Prof Mianqi Xue Prof Rui Li Prof Feng Pan |
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| Institution: | 1. School of Advanced Materials, Peking University Shenzhen Graduate School, Shenzhen, China;2. Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing, China;3. Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Peking University, Beijing, China;4. Institute of Physics, Chinese Academy of Sciences, Beijing, China |
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| Abstract: | The rechargeable aqueous metal‐ion battery (RAMB) has attracted considerable attention due to its safety, low costs, and environmental friendliness. Yet the poor‐performance electrode materials lead to a low feasibility of practical application. A hybrid aqueous battery (HAB) built from electrode materials with selective cation channels could increase the electrode applicability and thus enlarge the application of RAMB. Herein, we construct a high‐voltage K–Na HAB based on K2FeFe(CN)6 cathode and carbon‐coated NaTi2(PO4)3 (NTP/C) anode. Due to the unique cation selectivity of both materials and ultrafast ion conduction of NTP/C, the hybrid battery delivers a high capacity of 160 mAh g?1 at a 0.5 C rate. Considerable capacity retention of 94.3 % is also obtained after 1000 cycles at even 60 C rate. Meanwhile, high energy density of 69.6 Wh kg?1 based on the total mass of active electrode materials is obtained, which is comparable and even superior to that of the lead acid, Ni/Cd, and Ni/MH batteries. |
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| Keywords: | batteries energy-storage materials fast ion conduction ion selectivity selective cation channels |
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