Complex permittivity-dependent plasma confinement-assisted growth of asymmetric vertical graphene nanofiber membrane for high-performance Li-S full cells,InfoMat

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Complex permittivity-dependent plasma confinement-assisted growth of asymmetric vertical graphene nanofiber membrane for high-performance Li-S full cells
InfoMat ( IF 22.7 ) Pub Date : 2022-02-17 , DOI: 10.1002/inf2.12294
Yongshang Zhang _{1,

2} , Zhiheng Wu _{1,

2} , Shaobin Wang ₃ , Neng Li ₄ , S. Ravi P. Silva _{1,

2,

5} , Guosheng Shao _{1,

2} , Peng Zhang _{1,

2}

Affiliation

Vertical graphene (VG), possessing superior chemical, physical, and structural peculiarities, holds great promise as a building block for constructing a high-energy density lithium-sulfur (Li-S) battery. Therefore, it is desirable to develop a new VG growth technique with a novel structure to enable wide applications. Herein, we devise a novel complex permittivity-dependent plasma confinement-assisted VG growth technique, via asymmetric growing a VG layer on one side of N-doped carbon nanofibers for the first time, using a unique lab-built high flux plasma-enhanced chemical vapor deposition system, as a bifunctional nanofiber membrane to construct Li-S batteries with low negative/positive (N/P) and electrolyte/sulfur (E/S) ratios. The unique nanofiber membrane could simultaneously protect the cathode and anode, enabling an excellent electrochemical performance with low N/P and E/S ratios in Li-S batteries. Such a full cell delivers high gravimetric energy density and volumetric energy density of 340 Wh kg⁻¹ and 547 Wh L⁻¹, respectively, at low N/P (2:1) and E/S (4:1) ratios. Furthermore, a pouch cell achieves a high areal capacity of 7.1 mAh cm⁻² at a sulfur loading of 6 mg cm⁻². This work put forward a novel pathway for the design of high-energy density Li-S batteries.

中文翻译：

用于高性能Li-S全电池的非对称垂直石墨烯纳米纤维膜的复杂介电常数依赖等离子体限制辅助生长

垂直石墨烯 (VG) 具有优异的化学、物理和结构特性，有望成为构建高能量密度锂硫 (Li-S) 电池的基石。因此，需要开发一种具有新颖结构的新型VG生长技术以实现广泛应用。在此，我们设计了一种新的复杂介电常数依赖等离子体约束辅助 VG 生长技术，通过使用独特的实验室构建的高通量等离子体增强化学物质，首次在 N 掺杂碳纳米纤维的一侧不对称生长 VG 层。气相沉积系统，作为双功能纳米纤维膜构建具有低负/正（N/P）和电解质/硫（E/S）比的Li-S电池。独特的纳米纤维膜可以同时保护阴极和阳极，在锂硫电池中以低 N/P 和 E/S 比实现优异的电化学性能。这种全电池可提供 340 Wh kg 的高重量能量密度和体积能量密度^-1和 547 Wh L ^-1分别在低 N/P (2:1) 和 E/S (4:1) 比率下。此外，软包电池在 6 mg cm ^-2的硫负载下实现了 7.1 mAh cm ^-2的高面积容量。这项工作为设计高能量密度锂硫电池提供了一条新途径。

更新日期：2022-02-17

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