纳米片
材料科学
催化作用
分离器(采油)
化学工程
硫黄
吸附
热解
纳米技术
碳纤维
复合材料
有机化学
复合数
化学
冶金
物理
工程类
热力学
作者
Rui Wang,Jinlei Qin,Fei Pei,Zhizhan Li,Pei Xiao,Yunhui Huang,Lixia Yuan,Deli Wang
标识
DOI:10.1002/adfm.202305991
摘要
Abstract The sluggish conversion kinetics and shuttling behavior of lithium polysulfides (LiPSs) seriously deteriorate the practical application of lithium–sulfur (Li–S) batteries. Herein, Ni single atoms on hollow carbon nanosheet‐assembled flowers (Ni‐NC) are synthesized via a facile pyrolysis‐adsorption process to address these challenges. The as‐designed Ni‐NC with enhanced mesoporosity and accessible surface area can expose more catalytic sites and facilitate electron/ion transfer. These advantages enable the Ni‐NC‐modified separator to exhibit both enhanced confinement‐catalysis ability and suppressed shuttling of LiPSs. Consequently, the Li−S battery with Ni‐NC‐modified separator shows an initial capacity of 1167 mAh g −1 with a low capacity decay ratio (0.033% per cycle) over 700 cycles at 1 C. Even at the sulfur loading of 6.17 mg cm −2 , a high areal capacity of 5.17 mAh cm −2 is realized at 0.1 C, together with superior cycling stability over 300 cycles. This work provides a facile catalyst design strategy for the development of high‐performance Li−S batteries.
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