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An Ultrahigh-Power Mesocarbon Microbeads|Na+-Diglyme|Na3V2(PO4)3 Sodium-Ion Battery
Advanced Materials ( IF 27.4 ) Pub Date : 2021-11-23 , DOI: 10.1002/adma.202108304 Qiulong Wei 1 , Xiaoqing Chang 1 , Jian Wang 1 , Tingyi Huang 1 , Xiaojuan Huang 1 , Jiayu Yu 1 , Hongfei Zheng 1 , Jin-Hui Chen 2 , Dong-Liang Peng 1
Advanced Materials ( IF 27.4 ) Pub Date : 2021-11-23 , DOI: 10.1002/adma.202108304 Qiulong Wei 1 , Xiaoqing Chang 1 , Jian Wang 1 , Tingyi Huang 1 , Xiaojuan Huang 1 , Jiayu Yu 1 , Hongfei Zheng 1 , Jin-Hui Chen 2 , Dong-Liang Peng 1
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Sodium-ion batteries (SIBs) show practical applications in large-scale energy storage systems. But, their power density is limited by the sluggish Na+ diffusion into the cathode and anode materials. Herein, the authors demonstrate a prototype of ultrahigh power SIB, consisting of the high-rate Na3V2(PO4)3 (NVP) cathode, graphite-type mesocarbon microbeads (MCMB) anode, and Na+-diglyme electrolyte. It is found that the overpotential of the NVP cathode obeys the Ohmic rule. Thus, the as-synthesized NVP@C@carbon nanotubes (CNTs) cathode with the high conductive CNTs networks displays high electronic conductivity, reducing the overpotential and charge transfer resistances and leading to the remarkable rate capability over 1000C. For the MCMB anode, the initial [Na-diglyme]+ co-intercalation step is pseudocapacitive dominated, and then the expanded graphite's layers ensure the subsequent fast ions diffusion. The rapid (de)intercalation kinetics in between the cathode and anode are well-matched. Thus, the assembled MCMB|1 m NaPF6 in diglyme|NVP@C@CNTs full-cell SIB delivers the energy density of 88 Wh kg−1 at the high power density of ≈10 kW kg−1. Even at the ultrahigh power density of 23 kW kg−1, an energy density of 58 Wh kg−1 is obtained. The encouraging results of the full cell will promote the development of high-power SIB for large-scale applications in the future.
中文翻译：
一种超高功率中碳微珠|Na+-二甘醇二甲醚|Na3V2(PO4)3钠离子电池
钠离子电池 (SIB) 在大规模储能系统中显示出实际应用。但是，它们的功率密度受到缓慢的 Na +扩散到正极和负极材料中的限制。在此，作者展示了一种超高功率 SIB 原型，由高速 Na 3 V 2 (PO 4 ) 3 (NVP) 阴极、石墨型中间碳微珠 (MCMB) 阳极和 Na +-二甘醇二甲醚电解质。发现NVP阴极的过电位服从欧姆定律。因此，具有高导电性 CNTs 网络的合成后的 NVP@C@碳纳米管 (CNTs) 阴极显示出高电子导电性，降低了过电位和电荷转移电阻，并导致超过 1000C 的显着倍率性能。对于 MCMB 阳极，最初的 [Na-二甘醇二甲醚] +共插层步骤是赝电容为主，然后膨胀石墨层确保随后的快速离子扩散。阴极和阳极之间的快速（脱）嵌入动力学非常匹配。因此，在 diglyme |NVP@C@CNTs 全电池 SIB中组装的 MCMB|1 m NaPF 6可提供 88 Wh kg -1的能量密度在≈10 kW kg -1的高功率密度下。即使在23 kW kg -1的超高功率密度下，也可以获得58 Wh kg -1的能量密度。全电池的令人鼓舞的成果将推动未来大规模应用的高功率SIB的发展。
更新日期：2021-11-23
中文翻译：
一种超高功率中碳微珠|Na+-二甘醇二甲醚|Na3V2(PO4)3钠离子电池
钠离子电池 (SIB) 在大规模储能系统中显示出实际应用。但是，它们的功率密度受到缓慢的 Na +扩散到正极和负极材料中的限制。在此，作者展示了一种超高功率 SIB 原型，由高速 Na 3 V 2 (PO 4 ) 3 (NVP) 阴极、石墨型中间碳微珠 (MCMB) 阳极和 Na +-二甘醇二甲醚电解质。发现NVP阴极的过电位服从欧姆定律。因此，具有高导电性 CNTs 网络的合成后的 NVP@C@碳纳米管 (CNTs) 阴极显示出高电子导电性，降低了过电位和电荷转移电阻，并导致超过 1000C 的显着倍率性能。对于 MCMB 阳极，最初的 [Na-二甘醇二甲醚] +共插层步骤是赝电容为主，然后膨胀石墨层确保随后的快速离子扩散。阴极和阳极之间的快速（脱）嵌入动力学非常匹配。因此，在 diglyme |NVP@C@CNTs 全电池 SIB中组装的 MCMB|1 m NaPF 6可提供 88 Wh kg -1的能量密度在≈10 kW kg -1的高功率密度下。即使在23 kW kg -1的超高功率密度下，也可以获得58 Wh kg -1的能量密度。全电池的令人鼓舞的成果将推动未来大规模应用的高功率SIB的发展。
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