Nano-Micro Letters

Highly Reversible Li–Se Batteries with Ultra-Lightweight N,S-Codoped Graphene Blocking Layer

Xingxing Gu1,*, Lingbao Xin2, Yang Li3, Fan Dong1, Min Fu1, Yanglong Hou4,*

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Nano-Micro Lett. (2018) 10: 59

First Online: 13 June 2018 (Article)


*Corresponding author. E-mail: x.gu@ctbu.edu.cn ; hou@pku.edu.cn





The desire for practical utilization of rechargeable lithium batteries with high energy density has motivated attempts to develop new electrode materials and battery systems. Here, without additional binders we present a simple vacuum filtration method to synthesize nitrogen and sulfur codoped graphene (N,S-G) blocking layer, which is ultra-lightweight, conductive, and free-standing. When the N,S-G membrane was inserted between the catholyte and separator, the lithium–selenium (Li–Se) batteries exhibited a high reversible discharge capacity of 330.7 mAh g−1 at 1 C (1 C = 675 mA g−1) after 500 cycles, and high rate performance (over 310 mAh g−1 at 4 C) even at an active material loading as high as ~5 mg cm−2. This excellent performance can be ascribed to homogenous dispersion of the liquid active material in the electrode, good Li+-ion conductivity, fast electronic transport in the conductive graphene framework, and strong chemical confinement of polyselenides by nitrogen and sulfur atoms. More importantly, it is a promising strategy for enhancing the energy density of Li–Se batteries by using the catholyte with a lightweight heteroatom doping carbon matrix.



Li–Se batteries; N,S-codoped; Graphene; Ultra-lightweight; Free-standing; Vacuum filtration

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