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标题: The synergistic adsorption-electrocatalysis research of Mn2P interlayer for durable large-capacity and high-energy-efficiency Li-S batteries

作者: Yang, HQ (Yang, Hangqi); Geng, MZ (Geng, Mengzi); Tang, WP (Tang, Weiping); Shang, CQ (Shang, Chaoqun)

来源出版物: CHEMICAL ENGINEERING JOURNAL 卷: 450 文献号: 137925 DOI: 10.1016/j.cej.2022.137925 子辑: 1 出版年: DEC 15 2022

摘要: The commercialization of Li-S batteries (LSBs) as next-generation high-energy-density energy storage devices is hindered by the remarkable shuttle effect of soluble lithium polysulfides (LiPSs). In this study, Mn2P-based materials (Mn2P@C) were investigated as an interlayer between S-contained cathode and separator to confine S species in the cathode region. Specifically, the porous structure of amorphous carbon layer has a physical adsorption effect on LiPSs, while Mn2P not only exhibits a strong chemical bonding force with LiPSs but also helps enhance the solid-liquid phase conversion and Li2S nucleation growth kinetics. Benefiting from the desirable modulation of Mn2P@C, the LSBs have good cycling stability (0.04% capacity decay per cycle), favorable rate capability (659.7 mAh g-1 at 5C), and high energy efficiency (81.4% at 5C). The LSBs still show a specific capacity of 490 mAh g-1 even with a high S loading (8.6 mg cm-2) and lean electrolyte (E/S = 6.2 mu L mg-1). Furthermore, the LSBs with Mn2P@C exhibited high resistance to self-discharge. This study shows Mn2P@C's great potential in the field of LSBs with high energy density and efficiency and provides some insights into commercial design and other relevant fields.

作者关键词: Shuttle effect; Mn2P@C interlayer; Electrochemical kinetics; Li-S batteries; Energy efficiency

地址: [Yang, Hangqi; Geng, Mengzi; Tang, Weiping; Shang, Chaoqun] Wuhan Univ, Sch Resource & Environm Sci, Wuhan 430072, Peoples R China.

[Shang, Chaoqun] Wuhan Inst Technol, Sch Mat Sci & Engn, Wuhan 430205, Peoples R China.

[Shang, Chaoqun] Wuhan Inst Technol, Hubei Key Lab Plasma Chem & Adv Mat, Wuhan 430205, Peoples R China.

通讯作者地址: Shang, CQ (通讯作者)，Wuhan Univ, Sch Resource & Environm Sci, Wuhan 430072, Peoples R China.

电子邮件地址: chaoqun.shang@foxmail.com

影响因子：16.744