Bio-inspired Nanoscaled Electronic/Ionic Conduction Networks for Room-Temperature All-Solid-State Sodium-Sulfur Battery
Bio-inspired Nanoscaled Electronic/Ionic Conduction Networks for Room-Temperature All-Solid-State Sodium-Sulfur Battery
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DOI：
10.1016/j.nantod.2020.100860
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发表时间：
2020-08
期刊：
影响因子：
17.4
通讯作者：
Hongli Wan;Wei Weng;Fudong Han;Liangting Cai;Chunsheng Wang;X. Yao
中科院分区：
文献类型：
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作者：
Hongli Wan;Wei Weng;Fudong Han;Liangting Cai;Chunsheng Wang;X. Yao
具有纳米级电子/离子网络的硫磺正极是实现高能量密度和长循环寿命的全固态Na/S电池的关键。然而，无论是用机械球磨还是用液相反应的方法来制备这样的结构都是一个巨大的挑战。本文采用液相反应和机械球磨相结合的方法制备了一次电子/离子通道和纳米级二次局部通道的S-Na_3SbS_4-C阴极。系统地研究了S-Na3SbS4-C中纳米级局部道路的形成机理。具有三维分布的一次和二次离子/电子传导网络的S-Na3SbS4-C纳米复合正极在50 mA g-1下具有高的初始放电容量1504.3 mAhg-1，室温库仑效率为98.5%。同时，S-Na3SbS4-C/Na电池也表现出优异的倍率性能，在50、100、200、300、500、1000和2000 mAg-1的电流密度下，容量分别为1386.3、1324.1、1150.8、893.4、825.6、771.2和662.3 mAHg-1。即使在6.34mgcm-2和12.74mgcm-2的超高负极负荷下，S-Na3SbS4-C/Na电池在100mAg-1下的可逆放电比容量分别达到742.9和465.6 mAHg-1。S-Na3SbS4-C/Na电池是迄今为止报道的室温全固态钠硫电池最好的倍率性能之一。本工作为高性能室温全固态钠硫电池混合导电复合正极的设计提供了一种简单的策略。
Sulfur cathode with nano-scaled electronic/ionic network is essential for all-solid-state Na/S batteries to achieve high energy density and long cycle life. However, it is great challenged to fabricate such a structure using either mechanical milling or liquid-phase reaction method. Here, a S-Na3SbS4-C cathode with distributed micro-scaled primary electronic/ionic highways along with nano-scaled secondary local-roads is fabricated by combining the liquid-phase reaction and mechanical milling. The formation mechanism for nano-scaled local-roads in S-Na3SbS4-C is systematically investigated. The S-Na3SbS4-C nanocomposite cathode with 3D distributed primary and secondary ionic/electronic conduction network provides a high initial discharge capacity of 1504.3 mAh g-1at 50 mA g-1with Coulombic efficiency of 98.5% at room temperature. Meanwhile, S-Na3SbS4-C/Na cells also demonstrate excellent rate capability with capacities of 1386.3, 1324.1, 1150.8, 893.4, 825.6, 771.2 and 662.3 mAh g-1at current densities of 50, 100, 200, 300, 500, 1000 and 2000 mA g-1, respectively. Even at ultrahigh cathode loading of 6.34 and 12.74 mg cm-2, the S-Na3SbS4-C/Na cells can deliver reversible discharge specific capacities of 742.9 and 465.6 mAh g-1at 100 mA g-1, respectively. S-Na3SbS4-C/Na cell represents one of the best rate performances for room-temperature all-solid-state sodium-sulfur batteries reported to date. This work provides a simple strategy to design mixed conductive composite cathode for high-performance room-temperature all-solid-state sodium-sulfur batteries.