Ultrafast Sodium Intercalation Pseudocapacitance in MoS2 Facilitated by Phase Transition Suppression

被引：13

作者：

Cook, John B. ^{[1
,2
]}

Ko, Jesse S. ^{[3
,4
]}

Lin, Terri C. ^{[1
]}

Robertson, Daniel D. ^{[1
]}

Kim, Hyung-Seok ^{[3
]}

Yan, Yan ^{[1
]}

Yao, Yiyi ^{[1
]}

Dunn, Bruce S. ^{[3
,5
]}

Tolbert, Sarah H. ^{[1
,3
,5
]}

机构：

[1] Univ Calif Los Angeles, Dept Chem & Biochem, Los Angeles, CA 90095 USA

[2] Xer Adv Battery Corp, 3100 Res Blvd Suite 320, Kettering, OH 45420 USA

[3] Univ Calif Los Angeles, Dept Mat Sci & Engn, Los Angeles, CA 90095 USA

[4] Johns Hopkins Univ, Appl Phys Lab, 11100 Johns Hopkins Rd, Laurel, MD 20723 USA

[5] Univ Calif Los Angeles, Calif Nanosyst Inst, Los Angeles, CA 90095 USA

来源：

ACS APPLIED ENERGY MATERIALS | 2022年 / 6卷 / 01期

基金：

美国国家科学基金会;

关键词：

MoS2; phase transition suppression; pseudocapacitance; Na-ion; fast-charging; nanocrystals; X-RAY-DIFFRACTION; LITHIUM INTERCALATION; LI-INTERCALATION; ENERGY-STORAGE; CHARGE STORAGE; ION; VOLTAMMETRY; ELECTRODES; CHEMISTRY; INSERTION;

D O I：

10.1021/acsaem.2c02368

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Sodium-ion intercalation pseudocapacitance promises fast energy storage that is cheaper than lithium-ion-based systems. MoS2 is an attractive sodium-ion host due to its large van der Waals gaps, high Na+ mobility, and high electronic conductivity in the 1T phase. In this paper, we have quantified high levels (>90%) of pseudocapacitive charge storage in 30 mu m thick MoS2 nanocrystal-based composite electrodes, which can be charged to almost 50% of their 1C capacity in just under 40 s. In addition, very little decay is observed in the delivered capacity (retention of 97%) after 1800 cycles at a rate of 20C. Synchrotron-based operando X-ray diffraction shows that the pseudocapacitive performance is enabled through suppression of the trigonal 1T-MoS2 to triclinic NaxMoS2 phase transition in MoS2 nanocrystals during charge-discharge.

引用

页码：99 / 108

页数：10

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