Preparation of a carbon nanofiber/natural graphite composite and an evaluation of its electrochemical properties as an anode material for a Li-ion battery

Jang, Sang Min; Miyawaki, Jin; Tsuji, Masaharu; Mochida, Isao; Yoon, Seong Ho; Kang, Feiyu

doi:10.1016/s1872-5805(09)60018-4

Cited by 15 publications

(10 citation statements)

References 12 publications

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“…CNF is also used as a carbonaceous additive to enhance the electrochemical performance of the FG anode due to its high electronic conductivity of about 10 5 S cm –1 . Yoon et al [ 29 ] proved that growing CNFs on the surface edges of FG was an efficient way to improve the rate capability. The ivy‐like CNFs can mitigate the volumetric change of the anode and provide interspace for stress releasing caused by the expansion of graphite particles during the lithiation process (Figure 7b,c).…”

Section: Natural Graphite As An Anode Materialsmentioning

confidence: 99%

“…[ 22–24 ] To improve its electrochemical performance, surface modification such as carbon coating is essential for NG to form a stable solid electrolyte interface (SEI) layer, which can reduce the initial irreversible capacity, enhance the cyclability, and improve the low‐temperature as well as thermal stability. [ 25 ] Besides, the NG can be hybridized with other carbon materials, including carbon nanotube (CNT), [ 26–28 ] carbon nanofiber (CNF), [ 29,30 ] and hard carbon [ 31 ] to further enhance the transport of electrons and Li + , leading to obvious improvements of cyclic stability and rate performance.…”

Section: Introductionmentioning

confidence: 99%

“…[4,5] Nowadays, graphite is still the most applied anode material in LIBs, which has low lithiation/de-lithiation potential and a theoretical capacity of 372 mA h g −1 when forming graphite intercalation compound of LiC 6 . [6][7][8] Graphite is divided into two types, carbon nanofiber (CNF), [29,30] and hard carbon [31] to further enhance the transport of electrons and Li + , leading to obvious improvements of cyclic stability and rate performance.…”

Section: Introductionmentioning

confidence: 99%

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Revisiting the Roles of Natural Graphite in Ongoing Lithium‐Ion Batteries

et al. 2022

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namely natural graphite (NG) and artificial graphite. NG originates from organics rich in carbon under long-term hightemperature and high-pressure geological environments, while artificial graphite is obtained by artificial carbonization and graphitization of organics under high temperature. The main types of NG include flake graphite (FG) and microcrystalline graphite (MG). NG, such as flake FG, delivers high capacity owing to its larger anisotropic crystalline domains, while the artificial graphite with higher purity and larger fraction of edge planes caused by smaller crystalline size presents excellent electrochemical kinetics, long cycle life, but low initial Coulombic efficiency (ICE). [9,10] NG has drawn great attention as anode material in LIBs due to the outstanding features such as high energy density, excellent processability, and low cost. [11,12] By 2020, NG accounted for 39% of the anode material market compared with 58% of artificial graphite. [13] It should be noted that the market share of NG will continue to grow due to the requirements for reducing CO 2 emission and environmental footprint since the production of artificial graphite is energy-intensive, high cost, and time consuming. [14] China is rich in resources of NG and is the world's largest exporter of NG. [15] FG shows a typical layered and anisotropic structure in which large graphite crystals stack together within orientation. [16] When used as an anode material, FG presents high specific capacity and ICE, but poor cyclic stability due to the structure destruction caused by volume expansion. [17,18] MG presents isotropic structure, consisting of graphitic microcrystals randomly stacked together. The MG anode presents better cyclic stability and outstanding rate performance due to the small volume expansion and shortened lithium ion (Li + ) diffusion distance, but low ICE owing to the large surface area. [16] It should be noted that our group invented NG-based materials as early as 1992, [19][20][21] and introduced such low-cost materials in many aspects of applications, and finally into LIBs as commercial anodes in 1997. [22][23][24] To improve its electrochemical performance, surface modification such as carbon coating is essential for NG to form a stable solid electrolyte interface (SEI) layer, which can reduce the initial irreversible capacity, enhance the cyclability, and improve the low-temperature as well as thermal stability. [25] Besides, the NG can be hybridized with other carbon materials, including carbon nanotube (CNT), [26][27][28] Graphite, commonly including artificial graphite and natural graphite (NG), possesses a relatively high theoretical capacity of 372 mA h g -1 and appropriate lithiation/de-lithiation potential, and has been extensively used as the anode of lithium-ion batteries (LIBs). With the requirements of reducing CO 2 emission to achieve carbon neutral, the market share of NG anode will continue to grow due to its excellent processability and low production energy consumption. NG, which is abundant in Chi...

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Section: Natural Graphite As An Anode Materialsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Revisiting the Roles of Natural Graphite in Ongoing Lithium‐Ion Batteries

et al. 2022

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“…[1][2][3][4][5] Carbon-based matter as anode materials for LIBs have attracted considerable attention because of their availability, thermal and chemical stability, high electronic conductivity, low Li + reaction potential, little volume change during cycling, low cost and ecofriendliness. 1,[5][6][7][8][9][10][11][12] However, the already commercial graphite as anode material for the next generation LIBs applied to EVs and HEVs is still quite challenging by poor rate capability and low storage capacity. [11][12][13] Thus, it is urgent to develop advanced electrode materials with high capacity, excellent rate capability and long cycling stability to meet the fast-growing demands for EVs and HEVs.…”

mentioning

confidence: 99%

“…Yoon et al 10 proposed that the carbon nanober/natural graphite composite as anode material in a lithium ion battery exhibits the remarkable rate capability at 1C rate with initial discharge capacity of 359 mA h g À1 , retaining over 90% of an initial discharge capacity aer 300 cycles. Guo et al 9 found that the reversible capacities for carbon nanosprings are 420 and 160 mA h g À1 at 0.05 and 3 A g À1 , respectively.…”

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confidence: 99%