Impact of Binder Choice on the Performance of α-Fe[sub 2]O[sub 3] as a Negative Electrode

Li, Jing; Dahn, Hannah; Krause, L. J.; Le, Dinh-Ba; Dahn, J. R.

doi:10.1149/1.2969433

Cited by 158 publications

(121 citation statements)

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“…9,[11][12][13][14] Furthermore, a selected binder, sodium carboxymethyl cellulose (CMC), can also improve cycling performance of a-Fe 2 O 3 at a low current density of 100 mA g À1 . 10 It is noticed that almost all the previous reports focused on very low rate charge/discharge current densities (about 0.1 C ¼ 100 mA g À1 ). It is still a great challenge to improve the high rate capability of iron oxide-base materials.…”

Section: Introductionmentioning

confidence: 99%

“…[4][5][6] As one of the promising anode materials, hematite (a-Fe 2 O 3 ) has been investigated intensively due to its great advantages such as high theoretical capacity (1007 mAh g À1 ), low cost, good stability, environmental friendliness, and high resistance to corrosion. [7][8][9][10][11][12][13][14][15] Recently, the capacity retention of iron oxide can be improved via fabricating active materials into hollow/nano-structures which could accommodate volume changes and shorten the lithium diffusion length. 9,[11][12][13][14] Furthermore, a selected binder, sodium carboxymethyl cellulose (CMC), can also improve cycling performance of a-Fe 2 O 3 at a low current density of 100 mA g À1 .…”

Section: Introductionmentioning

confidence: 99%

“…The HIOC electrode with 5.3% carbon demonstrates a stable capacity as high as 1210 mAh g À1 after 50 cycles which is much better than the other a-Fe 2 O 3 materials reported previously, 7-15 such as aFe 2 O 3 nanospheres (414 mAh g À1 for 60 cycles), 12 a-Fe 2 O 3 nanotubes (800 mAh g À1 for 20 cycles) 9 and microsize a-Fe 2 O 3 using CMC as binder (800 mAh g À1 for 100 cycles). 10 The performance is even comparable to the silicon-based composite materials, 27,28 which makes the materials more promising for further lithium battery applications. The HIO sample with 0% carbon shows the high capacity of around 1200 mAh g À1 for the first 5 cycles, but the capacity starts to drop from the 6th cycle.…”

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confidence: 98%

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High-surface-area α-Fe2O3/carbon nanocomposite: one-step synthesis and its highly reversible and enhanced high-rate lithium storage properties

et al. 2010

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Hollow-structured a-Fe 2 O 3 /carbon (HIOC) nanocomposite with a high surface area of around 260 m 2 g À1 was synthesized by a one-step, in situ, and industrially-oriented spray pyrolysis method using iron lactate and sucrose solution as the precursors. The small a-Fe 2 O 3 nanocrystals were highly dispersed inside amorphous carbon to form a carbon nanocomposite. Electrochemical measurements showed that the carbon played an important role in affecting both the cycle life and the rate capability of the electrode. The HIOC composites showed the best electrochemical performance in terms of high capacity (1210 mAh g À1 at a current density of 0.1 C), enhanced rate capability and excellent cycle stability (720 mAh g À1 at a current density of 2 C up to 220 cycles). HIOC nanocomposite can also be used in other potential applications, such as in gas sensors, catalysts, and biomedical applications because it is easily dispersed in water and has a high surface area.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 98%

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High-surface-area α-Fe2O3/carbon nanocomposite: one-step synthesis and its highly reversible and enhanced high-rate lithium storage properties

et al. 2010

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“…Li et al demonstrated that binder choice and electrode pre-heat treatment could stabilize m-sized particles of aFe 2 O 3 with an active material loading of 80 % but required cycling at a lower rate of C/5 (five hours each for charge and discharge). [13] In order to accommodate for the high volume expansion of silicon, Kang et al coated Si particles with Co-Co 3 O 4 by solgel. [14] The coating improved the 12th cycle efficiency from 55 % to 88 % for micron-sized particles.…”

Section: Introductionmentioning

confidence: 99%

Conformal Surface Coatings to Enable High Volume Expansion Li‐Ion Anode Materials

et al. 2010

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An alumina surface coating is demonstrated to improve electrochemical performance of MoO(3) nanoparticles as high capacity/high-volume expansion anodes for Li-ion batteries. Thin, conformal surface coatings were grown using atomic layer deposition (ALD) that relies on self-limiting surface reactions. ALD coatings were tested on both individual nanoparticles and prefabricated electrodes containing conductive additive and binder. The coated and non-coated materials were characterized using transmission electron microscopy, energy-dispersive X-ray spectroscopy, electrochemical impedance spectroscopy, and galvanostatic charge/discharge cycling. Importantly, increased stability and capacity retention was only observed when the fully fabricated electrode was coated. The alumina layer both improves the adhesion of the entire electrode, during volume expansion/contraction and protects the nanoparticle surfaces. Coating the entire electrode also allows for an important carbothermal reduction process that occurs during electrode pre-heat treatment. ALD is thus demonstrated as a novel and necessary method that may be employed to coat the tortuous network of a battery electrode.

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confidence: 99%

Fabrication of Cobalt and Cobalt Oxide/Graphene Composites: Towards High‐Performance Anode Materials for Lithium Ion Batteries

et al. 2010

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Recently, electrochemically active metals and metal oxides, such as Sn, [1] Si, [2] Co 3 O 4 , [3,4] and Fe 2 O 3 , [5] have attracted much attention as anode materials for lithium ion batteries due to their high theoretical capacities and promising potential. However, a large specific volume change commonly occurs in the host matrix of these metals and metal oxides during the cycling process. The resulting partial pulverization of the electrodes leads to a decrease in electrical conductivity and reversible capacity. [1,6] To circumvent these problems, graphitic carbons with high electrical conductivity have been widely used as matrices for metals and metal oxides to improve their cycle performances. [7,8] Although remarkable progress has been made, the metals and metal oxides unavoidably aggregate after long cycles since they are mainly located on the surface of the graphitic carbon. [7] Graphene, an integral part of graphite, is a 2D aromatic monolayer of carbon atoms not only exhibiting superior electrical conductivity and high surface area, [3,9] but also possessing structural flexibility, chemical tolerance, and reassembly properties.[10-13] Such merits suggest that graphene sheets hold promise as matrices for metals and metal oxides to improve their electrochemical performance. Graphene can generally be produced by the chemical reduction of readily available exfoliated graphite oxide with reducing agents, such as hydrazine or dimethylhydrazine. [14][15][16][17] Recently, SnO 2 /graphene, [11] carbon nanotube/graphene, and fullerene/graphene [10] composites were fabricated by the assembly of graphene sheets in the presence of inorganic precursors. Highly reversible capacities and good cycle performances were achieved when using these as anode materials for lithium ion batteries. Nevertheless, these inorganic precursors are still prone to strong aggregation and thus preclude a homogenous dispersion in graphenebased composites.In this Communication, we describe a new strategy by choosing planar metallo-organic molecules, such as cobalt phthalocyanine (CoPc), for the purpose of fabricating organic metal/graphene composites. Due to their pronounced p-interactions with graphene sheets, [18] they enable a homogenous dispersion of cobalt and cobalt oxide into/onto the graphene sheets by a simple pyrolysis and oxidation process. As a consequence, the graphene sheets (GS) in composites can not only efficiently buffer the volume change of cobalt oxide during charging and discharging processes but also preserve the high electrical conductivity of the overall electrode. One thus expects highly reversible capacity, good cycle performance, and good rate capability of the cobalt oxide/graphene composite as anode materials for lithium ion batteries.As illustrated in Scheme 1, graphite oxide was suspended in a solution of ultrapure water and ammonia (25 wt % in water) to create a brown dispersion with a concentration of 0.05 wt %. The dispersion was then homogeneously mixed with CoPc molecules by ultrasonication, in which th...

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Impact of Binder Choice on the Performance of α-Fe[sub 2]O[sub 3] as a Negative Electrode

Cited by 158 publications

References 27 publications

High-surface-area α-Fe2O3/carbon nanocomposite: one-step synthesis and its highly reversible and enhanced high-rate lithium storage properties

High-surface-area α-Fe2O3/carbon nanocomposite: one-step synthesis and its highly reversible and enhanced high-rate lithium storage properties

Conformal Surface Coatings to Enable High Volume Expansion Li‐Ion Anode Materials

Fabrication of Cobalt and Cobalt Oxide/Graphene Composites: Towards High‐Performance Anode Materials for Lithium Ion Batteries

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