Graphene-decorated carbon-coated LiFePO4 nanospheres as a high-performance cathode material for lithium-ion batteries

Wang, Xufeng; Feng, Zhijun; Huang, Juntong; Deng, Wen; Li, Xibao; Zhang, Huasen; Wen, Zhenhai

doi:10.1016/j.carbon.2017.10.101

Cited by 214 publications

(76 citation statements)

References 55 publications

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“…In this case, the weight fraction of graphene was 8.63 wt %. Recently, graphene-decorated carbon-coated LiFePO 4 nanospheres, with approximately 3 wt % graphene, delivered capacities of 164 and 147 mAh g −1 at 0.1 C and 1 C, respectively, and the capacity was retained at 81 mAh g −1 at 20 C. The composites revealed 8% capacity decay at 10 C after 500 cycles [66]. At 0.1 C, 1 C, and 10 C, well-dispersed LFP nanoparticles anchored on a 3D graphene aerogel displayed specific discharge capacities of 167, 153, and 120 mAh g −1 , respectively [67], higher than 3D porous LFP/graphite composite (134 and 48 mAh g −1 ) [68], graphene nanoribbon-wrapped LFP (152 and 103 mAh g −1 ) [69], and 3D amorphous carbon and graphene co-modified LFP (163 and 90 mAh g −1 ) [70].…”

Section: Lfp/graphene Compositesmentioning

confidence: 99%

Olivine Positive Electrodes for Li-Ion Batteries: Status and Perspectives

Mauger

Julien

2018

Batteries

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Among the compounds of the olivine family, LiMPO 4 with M = Fe, Mn, Ni, or Co, only LiFePO 4 is currently used as the active element of positive electrodes in lithium-ion batteries. However, intensive research devoted to other elements of the family has recently been successful in significantly improving their electrochemical performance, so that some of them are now promising for application in the battery industry and outperform LiFePO 4 in terms of energy density, a key parameter for use in electric vehicles in particular. The purpose of this review is to acknowledge the current state of the art and the progress that has been made recently on all the elements of the family and their solid solutions. We also discuss the results from the perspective of their potential application in the industry of Li-ion batteries.The main disadvantage of olivines with respect to other cathode chemistries for lithium batteries is the lower energy density. This is evidenced in Table 1 where we have reported the gravimetric and volumetric energy densities of LFP and two other cathode materials which have also found a market place in commercial batteries for electric vehicles: the manganese spinel LiMn 2 O 4 , and "LiNiCoAl" (NCA). In terms of energy density, the winner is clearly NCA, the cathode material used by Panasonic to manufacture the batteries of Tesla cars. However, the low energy density of LFP was not an obstacle for its success for EV applications. The top-selling EV manufacturer in the world today is BYD, which makes its own batteries. Its success comes from its choice of the LFP cathode chemistry. As an example, BYD's LFP battery used by e6 taxis in Shenzen has a driving range of 200 km and can be charged to 80% in just 20 min, or 100% in only 40 min using a BYD DC fast charger. The town has 12,000 taxis which will be electric by the end of this year, and all of the 7,000,000 buses are already electric buses, 80% being BYD buses.

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Section: Lfp/graphene Compositesmentioning

confidence: 99%

Olivine Positive Electrodes for Li-Ion Batteries: Status and Perspectives

Mauger

Julien

2018

Batteries

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“…The main peak at 283.9 eV originated from the sp 2 -hybridized graphite single peak, and the peak at 284.9 eV was attributed to disordered sp 3 carbon. [50,51] This was attributed to the large contact area between the electrode, electrolyte and the sucrose-derived carbon,w hich could improvet he Li-ion transfer and electronic conductivity of the electrode. Therefore, the concentrationo fs p 2 carbon on the surfaceo fL iFePO 4 was high.…”

Section: Resultsmentioning

confidence: 99%

“…Moreover,t he high peak current value confirmed the good electrochemical properties of this material. [50,51] This was attributed to the large contact area between the electrode, electrolyte and the sucrose-derived carbon,w hich could improvet he Li-ion transfer and electronic conductivity of the electrode. The charge/discharge curves for the Li/LiFePO 4 cells at rates of 0.1 to 10 Ca re shown in Figure 4b.T he discharge capacityd rops if the C-rate is increased owing to the limitation on speed of lithium-ion diffusion at ah igh current density.T he crater-type LiFePO 4 exhibited much higherc apacity than the commercial porous LiFePO 4 prepared by the sol-gel method ( Figure S5), with ah igh discharge capacity of 165.7 mAh g À1 at 0.1 C( 159.5, 151.7, and 140.6 mAh g À1 at 0.5, 1, and 5C,r espectively).I tc ould maintain ac apacity of 127.5 mAh g À1 at ah igh current density of 10 C, whereas the commercial porous LiFePO 4 only managed 97.2 mAh g À1 .A fter 51 cycles, the charging rate was returned to 0.1 C, and the dischargec apacity of the crater-typeL iFePO 4 recovered to 163.5 mAh g À1 ,w hich was approximately9 9% of the initial capacity (Figure 4c).…”

Section: Resultsmentioning

confidence: 99%

Electrode Materials with a Crater‐Type Morphology Prepared by Electrospraying for High‐Performance Lithium‐Ion Batteries

Kim

2019

ChemSusChem

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Rechargeable lithium‐ion batteries with good electrochemical properties require nanostructured electrode materials, which are usually prepared through complex synthesis processes. Herein, a new facile method is reported for the synthesis of high‐performance electrode materials with a crater‐like morphology through repulsion between positive charges. The produced electrode material does not possess a nanostructure. However, it is capable of rapidly transferring lithium ions and electrons owing to the large contact area with electrolyte and the high concentration sp2‐hybridized carbon coating. LiFePO4 and LiNi1/3Co1/3Mn1/3O2 electrodes prepared by this process achieved high discharge capacities of 165.7 and 199.9 mAh g−1 at 0.1 C, with excellent rate capability of 127.5 and 162.6 mAh g−1 at 10 C, respectively. Although the crater‐type materials might decrease the electrode tap density, they facilitate better electrochemical properties such as high capacity, high power, and fast charging. Furthermore, this new method can be applied trough a sol–gel process for the synthesis of electrode materials to improve their electrochemical characteristics.

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“…Raman spectroscopy can indicate the presence and level of impurities in carbon hybridization; 43 the D-band is associated with the disorders or defects in graphitic structures and the Gband is attributed to the presence of graphitic carbon. 44,45 As shown in Fig. 7, the relative intensity I D /I G ratios (where I D and I G are the D-band and G-band Raman intensities 46 ) of the D band ($1329 cm À1 ) and G band ($1584 cm À1 ) for GO and RGO are 1.37 and 0.96, implying that the proportion of defects in RGO is less than that in GO.…”

Section: Characterization Of Graphene Oxidementioning

confidence: 90%