Synthesis of V-MoS2 Layered Alloys as Stable Li-Ion Battery Anodes

Yu Lei, Kazunori Fujisawa, Fu Zhang, Natalie Briggs, Amir Reza Aref, Yin Ting Yeh, Zhong Lin, Joshua A. Robinson, Ramakrishnan Rajagopalan, Mauricio Terrones

Research output: Contribution to journalArticle

Abstract

Layered MoS2 nanostructures are attractive candidates as high-capacity anodes for lithium-ion batteries (LIB). However, the low intrinsic electrical conductivity of MoS2 limits its rate performance. Herein, we demonstrate that the electrical conductivity of MoS2 can be significantly improved by adding V atoms substitutionally via a two-step approach that includes the electrodeposition of amorphous MoS2 followed by a solid-state reaction that is able to crystallize the layered material and introduce V atoms into the MoS2 lattice. This approach also has the following advantages: (i) electrodeposition is a scalable process for synthesizing MoS2 films directly on the current collectors and (ii) amorphous electrodeposited MoS2 is prone to be doped with heteroatoms, thus allowing extensive V solubility ranging from 3.8 to 17.6 atom % in MoS2. This incorporation of vanadium (V 17.6 atom %) significantly reduces the band gap of MoS2 from 1.56 to 0.90 eV. The improvement in the electrical conductivity and Li-ion diffusion of V-MoS2 alloys also increases the retention capacity at high current densities (1000 mA g-1) by more than 4 times that of MoS2, with stable cyclability at both 200 and 1000 mAh g-1. The improved rate performance and capacity retention of V-MoS2 indicate that transition-metal alloying offers a viable alternative strategy when designing high-performance LIB anodes.

Original languageEnglish (US)
JournalACS Applied Energy Materials
DOIs
StateAccepted/In press - Jan 1 2019

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Anodes
Atoms
Electrodeposition
Vanadium
Solid state reactions
Alloying
Transition metals
Nanostructures
Energy gap
Current density
Solubility
Ions
Lithium-ion batteries
Electric Conductivity

All Science Journal Classification (ASJC) codes

  • Chemical Engineering (miscellaneous)
  • Energy Engineering and Power Technology
  • Electrochemistry
  • Materials Chemistry
  • Electrical and Electronic Engineering

Cite this

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title = "Synthesis of V-MoS2 Layered Alloys as Stable Li-Ion Battery Anodes",
abstract = "Layered MoS2 nanostructures are attractive candidates as high-capacity anodes for lithium-ion batteries (LIB). However, the low intrinsic electrical conductivity of MoS2 limits its rate performance. Herein, we demonstrate that the electrical conductivity of MoS2 can be significantly improved by adding V atoms substitutionally via a two-step approach that includes the electrodeposition of amorphous MoS2 followed by a solid-state reaction that is able to crystallize the layered material and introduce V atoms into the MoS2 lattice. This approach also has the following advantages: (i) electrodeposition is a scalable process for synthesizing MoS2 films directly on the current collectors and (ii) amorphous electrodeposited MoS2 is prone to be doped with heteroatoms, thus allowing extensive V solubility ranging from 3.8 to 17.6 atom {\%} in MoS2. This incorporation of vanadium (V 17.6 atom {\%}) significantly reduces the band gap of MoS2 from 1.56 to 0.90 eV. The improvement in the electrical conductivity and Li-ion diffusion of V-MoS2 alloys also increases the retention capacity at high current densities (1000 mA g-1) by more than 4 times that of MoS2, with stable cyclability at both 200 and 1000 mAh g-1. The improved rate performance and capacity retention of V-MoS2 indicate that transition-metal alloying offers a viable alternative strategy when designing high-performance LIB anodes.",
author = "Yu Lei and Kazunori Fujisawa and Fu Zhang and Natalie Briggs and Aref, {Amir Reza} and Yeh, {Yin Ting} and Zhong Lin and Robinson, {Joshua A.} and Ramakrishnan Rajagopalan and Mauricio Terrones",
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Synthesis of V-MoS2 Layered Alloys as Stable Li-Ion Battery Anodes. / Lei, Yu; Fujisawa, Kazunori; Zhang, Fu; Briggs, Natalie; Aref, Amir Reza; Yeh, Yin Ting; Lin, Zhong; Robinson, Joshua A.; Rajagopalan, Ramakrishnan; Terrones, Mauricio.

In: ACS Applied Energy Materials, 01.01.2019.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Synthesis of V-MoS2 Layered Alloys as Stable Li-Ion Battery Anodes

AU - Lei, Yu

AU - Fujisawa, Kazunori

AU - Zhang, Fu

AU - Briggs, Natalie

AU - Aref, Amir Reza

AU - Yeh, Yin Ting

AU - Lin, Zhong

AU - Robinson, Joshua A.

AU - Rajagopalan, Ramakrishnan

AU - Terrones, Mauricio

PY - 2019/1/1

Y1 - 2019/1/1

N2 - Layered MoS2 nanostructures are attractive candidates as high-capacity anodes for lithium-ion batteries (LIB). However, the low intrinsic electrical conductivity of MoS2 limits its rate performance. Herein, we demonstrate that the electrical conductivity of MoS2 can be significantly improved by adding V atoms substitutionally via a two-step approach that includes the electrodeposition of amorphous MoS2 followed by a solid-state reaction that is able to crystallize the layered material and introduce V atoms into the MoS2 lattice. This approach also has the following advantages: (i) electrodeposition is a scalable process for synthesizing MoS2 films directly on the current collectors and (ii) amorphous electrodeposited MoS2 is prone to be doped with heteroatoms, thus allowing extensive V solubility ranging from 3.8 to 17.6 atom % in MoS2. This incorporation of vanadium (V 17.6 atom %) significantly reduces the band gap of MoS2 from 1.56 to 0.90 eV. The improvement in the electrical conductivity and Li-ion diffusion of V-MoS2 alloys also increases the retention capacity at high current densities (1000 mA g-1) by more than 4 times that of MoS2, with stable cyclability at both 200 and 1000 mAh g-1. The improved rate performance and capacity retention of V-MoS2 indicate that transition-metal alloying offers a viable alternative strategy when designing high-performance LIB anodes.

AB - Layered MoS2 nanostructures are attractive candidates as high-capacity anodes for lithium-ion batteries (LIB). However, the low intrinsic electrical conductivity of MoS2 limits its rate performance. Herein, we demonstrate that the electrical conductivity of MoS2 can be significantly improved by adding V atoms substitutionally via a two-step approach that includes the electrodeposition of amorphous MoS2 followed by a solid-state reaction that is able to crystallize the layered material and introduce V atoms into the MoS2 lattice. This approach also has the following advantages: (i) electrodeposition is a scalable process for synthesizing MoS2 films directly on the current collectors and (ii) amorphous electrodeposited MoS2 is prone to be doped with heteroatoms, thus allowing extensive V solubility ranging from 3.8 to 17.6 atom % in MoS2. This incorporation of vanadium (V 17.6 atom %) significantly reduces the band gap of MoS2 from 1.56 to 0.90 eV. The improvement in the electrical conductivity and Li-ion diffusion of V-MoS2 alloys also increases the retention capacity at high current densities (1000 mA g-1) by more than 4 times that of MoS2, with stable cyclability at both 200 and 1000 mAh g-1. The improved rate performance and capacity retention of V-MoS2 indicate that transition-metal alloying offers a viable alternative strategy when designing high-performance LIB anodes.

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