Inverse Gas Chromatography

Milczewska, Kasylda; Voelkel, Adam

doi:10.1002/9783527645602.ch10

Cited by 1 publication

(1 citation statement)

References 80 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…14 In this paper, nickel was introduced into LVO to investigate its effects on the structure and electrochemical performance of LVO. An inverse gas chromatography method 15,16 was first used to identify the effects of nickel doping on the surface energy, and it was found that the resultant nickel-doped LVO (Ni-LVO) exhibited high surface energy and capability of 650 mA g − 1 at 50 mA g − 1 . At 2 and 4 A g − 1 , it maintained a reversible capability of 267 and 191 mAh g − 1 , respectively.…”

Section: Introductionmentioning

confidence: 99%

Effects of high surface energy on lithium-ion intercalation properties of Ni-doped Li3VO4

et al. 2016

View full text Add to dashboard Cite

Nickel was doped into Li 3 VO 4 (Ni-LVO) successfully via a facile room temperature reaction, and the resulting Ni-LVO nanocrystallites showed excellent lithium-ion storage properties with a capacity of 650 mAh g − 1 at 50 mAh g − 1 and excellent capacity stability as an anode in lithium-ion batteries, maintaining nearly 100% of the initial reversible capacity after 800 cycles at 1 A g − 1 . The superior electrochemical properties arose largely from the nickel doping in the Ni-LVO. The surface energy of the electrode material was analyzed by an inverse gas chromatography method, and the Ni-LVO surface energy, 43.91 mJ m − 2 , was much higher than the 30.74 mJ m − 2 of Li 3 VO 4 . X-ray photoelectron spectra results demonstrated that nickel doping promoted the formation of tetravalent vanadium ions, V 4+ , as well as a more amorphous surface of Li 3 VO 4 , thus probably resulting in more nucleation sites for the phase transformation and reduced activation energy of the redox reactions and phase transition during the lithium-ion intercalation/extraction processes. NPG Asia Materials (2016) 8, e287; doi:10.1038/am.2016.95; published online 22 July 2016 INTRODUCTION Li 3 VO 4 (LVO), whose structure consists of corner-sharing VO 4 and LiO 4 tetrahedra, has been studied as a promising anode material for lithium-ion batteries. 1,2 It possesses several advantages over other anode materials. First, LVO has a small structural and volume change during lithiation/delithiation processes, thus resulting in good cyclic durability. 3 Second, it has high ionic conductivity (~10 − 4 S cm − 1 ), which facilitates the effective diffusion of lithium ions in bulk. 4 Third, compared with Li 4 Ti 5 O 12 , LVO can intercalate lithium ions in a low-voltage region (between 0.5 and 1.0 V vs Li/Li + ), thus eventually offering a high full cell energy density and maintaining good safety. 3,5 Finally, the hollow, lantern-like, three-dimensional structure of LVO crystal provides many empty sites to accommodate lithium ions and serves as lithium ion insertion channels. Theoretical calculations indicate that the inserted lithium ions have two different Wyckoff sites, which are stably occupied by three external lithium ions corresponding to a theoretical capacity of 591 mAh g − 1 when discharged to 0.01 V vs Li/Li + . 6 Despite these advantages, LVO suffers from low electrical conductivity, which may cause large polarization and poor rate capability. Hybridization with carbon materials such as graphite, 7,8 carbon nanotubes 9 and graphene 10,11 and reduction of the LVO particle size have been proven to be effective ways to enhance electrical conductivity and abate polarization. For example, carbon-encapsulated LVO nanoparticles synthesized by a simple solid-state method exhibit excellent rate capability and long cycling performance. 1 In addition, defects introduced by doping, thermal treatment at an inert or

show abstract

Section: Introductionmentioning

confidence: 99%