Structurally tailored graphene nanosheets as lithium ion battery anodes: an insight to yield exceptionally high lithium storage performance

Li, Xifei; Hu, Yuhai; Liu, Jian; Li, Ruying; Sun, Xueliang

doi:10.1039/c3nr04823c

Cited by 108 publications

(71 citation statements)

References 59 publications

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“…[ 48 ] In a typical synthesis of the composites, 60 mg SnCl 2 ·2H 2 O (Tianjin Fengchuan Chemical Reagent Science And Technology Co., Ltd. ≥ 98.0%) was fi rst dispersed in 60 mL ethylene glycol (Tianjin Jiangtian Chemical Technology Co., Ltd.) under vigorous magnetic stirring for 1 h. Meanwhile, 39 mg GO was dispersed in 60 mL ethylene glycol by ultrasonication. After 25 min of ultrasonic treatment, the GO suspension in ethylene glycol was added slowly into the above solution using a peristaltic pump to form a homogeneous mixture.…”

Section: Methodsmentioning

confidence: 99%

Controlled SnO₂ Crystallinity Effectively Dominating Sodium Storage Performance

Fan

Yan

et al. 2016

Advanced Energy Materials

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183

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The exploration of sodium ion batteries (SIBs) is a profound challenge due to the rich sodium abundance and limited supply of lithium on earth. Here, amorphous SnO2/graphene aerogel (a‐SnO2/GA) nanocomposites have been successfully synthesized via a hydrothermal method for use as anode materials in SIBs. The designed annealing process produces crystalline SnO2/graphene aerogel (c‐SnO2/GA) nanocomposites. For the first time, the significant effects of SnO2 crystallinity on sodium storage performance are studied in detail. Notably, a‐SnO2/GA is more effective than c‐SnO2/GA in overcoming electrode degradation from large volume changes associated with charge–discharge processes. Surprisingly, the amorphous SnO2 delivers a high specific capacity of 380.2 mAh g−1 after 100 cycles at a current density of 50 mA g−1, which is almost three times as much as for crystalline SnO2 (138.6 mAh g−1). The impressive electrochemical performance of amorphous SnO2 can be attributed to the intrinsic isotropic nature, the enhanced Na+ diffusion coefficient, and the strong interaction between amorphous SnO2 and GA. In addition, amorphous SnO2 particles with the smaller size better function to relieve the volume expansion/shrinkage. This study provides a significant research direction aiming to increase the electrochemical performance of the anode materials used in SIBs.

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Section: Methodsmentioning

confidence: 99%

Controlled SnO₂ Crystallinity Effectively Dominating Sodium Storage Performance

Fan

Yan

et al. 2016

Advanced Energy Materials

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183

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“…(3) Morphology manipulation. In addition to chemical engineering and microstructure control, morphology is another factor to influence binding between lithium ions and the electrode material [18,29].…”

Section: Introductionmentioning

confidence: 99%

Grain boundary and curvature enhanced lithium adsorption on carbon

Pang

Shi

Wei

et al. 2016

Carbon

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a b s t r a c tWhile the speculation that graphene may owe double or even higher capacity of lithium adsorption than graphite does remains speculative, there is growing evidence that defects and edges may promote lithium adsorption on graphene and other nanostructured carbon. Here we report a first-principles study on how grain boundary defects in graphene may influence the adsorption of lithium. The adsorption energy for Li atoms trapping in 5-, 7-, and 8-rings is much lower than the counter-part of Li atoms and pristine graphene. Such defective graphene could adsorb more Li atoms, and may reach the speculated ratio of 1:1 for C-Li adsorption. In a contrast study of lithium on fullerenes of different size, we find that the adsorption energy decreases with increasing size of fullerenes, but does not approach the energy when Li atoms adsorb on flat graphene. The energy in carbon nanotubes, however, converges to the adsorption energy between Li atoms and flat graphene if the radius of carbon nanotubes is sufficiently large. It hence indicates that while curvature plays a role in the enhanced adsorption in fullerenes, the twelve 5 rings in a fullerene ball is the primary factor accounting for the enhanced lithium adsorption.

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“…In the G/Au‐NP/Au‐NS electrode, graphene participates in the catalytic reactions by providing the conducting channels,65, 66 although its catalytic activity is weak as mentioned above. The poor catalytic activity of Au NSs for Li 2 O 2 growth may be due to the insufficient electron transfer since the Au NPs that bridge graphene with Au NSs are covered with insulating Li 2 O 2 .…”

Section: Resultsmentioning

confidence: 99%

High‐Performance Li–O₂ Batteries with Controlled Li₂O₂ Growth in Graphene/Au‐Nanoparticles/Au‐Nanosheets Sandwich

Wang

Xie

et al. 2016

Advanced Science

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The working of nonaqueous Li–O2 batteries relies on the reversible formation/decomposition of Li2O2 which is electrically insulating and reactive with carbon and electrolyte. Realizing controlled growth of Li2O2 is a prerequisite for high performance of Li–O2 batteries. In this work, a sandwich‐structured catalytic cathode is designed: graphene/Au‐nanoparticles/Au‐nanosheets (G/Au‐NP/Au‐NS) that enables controlled growth of Li2O2 spatially and structurally. It is found that thin‐layer Li2O2 (below 10 nm) can grow conformally on the surface of Au NPs confined in between graphene and Au NSs. This unique crystalline behavior of Li2O2 effectively relieves or defers the electrode deactivation with Li2O2 accumulation and largely reduces the contact of Li2O2 with graphene and electrolyte. As a result, Li–O2 batteries with the G/Au‐NP/Au‐NS cathode exhibit superior electrochemical performance. A stable cycling of battery can last 300 times at 400 mA g−1 when the capacity is limited at 500 mAh g−1. This work provides a practical design of catalytic cathodes capable of controlling Li2O2 growth.

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Structurally tailored graphene nanosheets as lithium ion battery anodes: an insight to yield exceptionally high lithium storage performance

Cited by 108 publications

References 59 publications

Controlled SnO₂ Crystallinity Effectively Dominating Sodium Storage Performance

Controlled SnO₂ Crystallinity Effectively Dominating Sodium Storage Performance

Grain boundary and curvature enhanced lithium adsorption on carbon

High‐Performance Li–O₂ Batteries with Controlled Li₂O₂ Growth in Graphene/Au‐Nanoparticles/Au‐Nanosheets Sandwich

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Structurally tailored graphene nanosheets as lithium ion battery anodes: an insight to yield exceptionally high lithium storage performance

Cited by 108 publications

References 59 publications

Controlled SnO2 Crystallinity Effectively Dominating Sodium Storage Performance

Controlled SnO2 Crystallinity Effectively Dominating Sodium Storage Performance

Grain boundary and curvature enhanced lithium adsorption on carbon

High‐Performance Li–O2 Batteries with Controlled Li2O2 Growth in Graphene/Au‐Nanoparticles/Au‐Nanosheets Sandwich

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Controlled SnO₂ Crystallinity Effectively Dominating Sodium Storage Performance

Controlled SnO₂ Crystallinity Effectively Dominating Sodium Storage Performance

High‐Performance Li–O₂ Batteries with Controlled Li₂O₂ Growth in Graphene/Au‐Nanoparticles/Au‐Nanosheets Sandwich