Pyrrolic‐Type Nitrogen‐Doped Hierarchical Macro/Mesoporous Carbon as a Bifunctional Host for High‐Performance Thick Cathodes for Lithium‐Sulfur Batteries

Small - Tập 15 Số 16 - 2019
Pauline Han1, Sheng‐Heng Chung1, Arumugam Manthiram1
1Materials Science and Engineering Program and Texas Materials Institute, The University of Texas at Austin, Austin, TX, 78712 USA

Tóm tắt

AbstractLithium‐sulfur (Li‐S) batteries are highly considered as a next‐generation energy storage device due to their high theoretical energy density. For practical viability, reasonable active‐material loading of >4.0 mg cm−2 must be employed, at a cost to the intrinsic instability of sulfur cathodes. The incursion of lithium polysulfides (LiPS) at higher sulfur loadings results in low active material utilization and poor cell cycling capability. The use of high‐surface‐area hierarchical macro/mesoporous inverse opal (IOP) carbons to investigate the effects of pore volume and surface area on the electrochemical stability of high‐loading, high‐thickness cathodes for Li‐S batteries is presented here. The IOP carbons are additionally doped with pyrrolic‐type nitrogen groups (N‐IOP) to act as a polar polysulfide mediator and enhance the active‐material reutilization. With a high sulfur loading of 6.0 mg cm−2, the Li‐S cells assembled with IOP and N‐IOP carbons are able to attain a high specific capacity of, respectively, 1242 and 1162 mA h g−1. The N‐IOP enables the Li‐S cells to demonstrate good electrochemical performance over 300 cycles.

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Tài liệu tham khảo

10.1021/ar300179v

10.1021/cr500062v

10.1002/adma.201405115

10.1002/adfm.201801188

10.1038/nenergy.2016.132

10.1038/nmat3191

10.1021/nn203436j

10.1038/ncomms8760

10.1039/C6NR04923K

10.1149/2.0181801jes

10.1039/c3cc46131a

10.1016/j.mtener.2018.01.002

10.1007/s41918-018-0010-3

10.1002/aenm.201500738

10.1039/c1ee02256c

10.1002/chem.201803153

10.1007/s41918-018-0016-x

10.1038/s41467-018-06877-9

10.1021/ja2062659

10.1039/c2cc17925c

10.1016/j.nanoen.2018.12.001

10.1021/jz5006913

10.1039/C5TA05053G

10.1016/j.jelechem.2016.02.037

10.1002/adma.201302877

10.1039/C6MH00426A

10.1016/S0009-2614(02)00600-0

10.1002/adfm.201303296

10.1021/nl2027684

10.1002/ange.201506972

10.1039/C6TA01060A

10.1016/j.nanoen.2016.12.002

10.1016/j.carbon.2016.07.008

10.1002/anie.201407103

10.1002/adfm.201707592

10.1039/c1jm12979a

10.1002/chem.201600040

10.1016/j.electacta.2011.03.005

10.1021/cm403740r

10.1039/C5EE02616D

10.1016/j.ensm.2017.07.015

10.1016/j.ensm.2015.09.007

10.1021/ar3001348

10.1002/aenm.201502459

10.1002/aenm.201402290

10.1002/adma.201103392

10.1039/C5TA10307J

10.1021/acsnano.6b06369

10.1002/adma.201502467

10.1149/2.020211jes

10.1038/ncomms6682

10.1016/j.electacta.2013.02.101

10.1039/C4TA00742E

10.1016/j.ensm.2018.11.002

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Small

Tập 15 Số 16

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