Preparation of Novel Electrode Materials Based on Lithium Niobium Sulfides

Sakuda, Atsushi; Takeuchi, Tomonari; Kobayashi, Hironori; Sakaebe, Hikarí; Tatsumi, Kuniaki; Ogumi, Zempachi

doi:10.5796/electrochemistry.82.880

Cited by 11 publications

(14 citation statements)

References 17 publications

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“…Therefore, it is difficult to determine the degree of volume change of the material by XRD measurements in charged and discharged electrodes. Thus, we estimated the volume change by measuring the molar volume of the mechanochemically prepared lithium niobium sulfides with the composition of LixNbS4 (x = 0, 1, 2, and 3) (Sakuda et al, 2014d) by measuring the powder true density using a gas pycnometer. Table 1 summarizes the results of the powder true density measurements.…”

Section: Discussionmentioning

confidence: 99%

High Reversibility of “Soft” Electrode Materials in All-Solid-State Batteries

Sakuda¹,

Takeuchi²,

Shikano³

et al. 2016

Front. Energy Res.

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All-solid-state batteries using inorganic solid electrolytes (SEs) are considered to be ideal batteries for electric vehicles and plug-in hybrid electric vehicles because they are potentially safer than conventional lithium-ion batteries (LIBs). In addition, all-solid-state batteries are expected to have long battery life owing to the inhibition of chemical side reactions because only lithium ions move through the typically used inorganic SEs. The development of high-energy density (more than 300 Wh kg −1 ) secondary batteries has been eagerly anticipated for years. The application of high-capacity electrode active materials is essential for fabricating such batteries. Recently, we proposed metal polysulfides as new electrode materials. These materials show higher conductivity and density than sulfur, which is advantageous for fabricating batteries with relatively higher energy density. Lithium niobium sulfides, such as Li3NbS4, have relatively high density, conductivity, and rate capability among metal polysulfide materials, and batteries with these materials have capacities high enough to potentially exceed the gravimetric-energy density of conventional LIBs. Favorable solid-solid contact between the electrode and electrolyte particles is a key factor for fabricating high performance all-solid-state batteries. Conventional oxide-based positive electrode materials tend to give rise to cracks during fabrication and/or charge-discharge processes. Here, we report all-solid-state cells using lithium niobium sulfide as a positive electrode material, where favorable solid-solid contact was established by using lithium sulfide electrode materials because of their high processability. Cracks were barely observed in the electrode particles in the all-solid-state cells before or after charging and discharging with a high capacity of approximately 400 mAh g −1 suggesting that the lithium niobium sulfide electrode charged and discharged without experiencing substantial mechanical damage. As a result, the all-solid-state cells retained more than 90% of their initial capacity after 200 cycles of charging and discharging at 0.5 mA cm −2 .

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Section: Discussionmentioning

confidence: 99%

High Reversibility of “Soft” Electrode Materials in All-Solid-State Batteries

Sakuda¹,

Takeuchi²,

Shikano³

et al. 2016

Front. Energy Res.

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“…These results are in agreement with our previous reports. [14][15][16][17] The prepared samples containing tin also charged and discharged, although their charge-discharge capacities gradually decreased as the tin ratio increased. Notably, the capacity was not proportional to the niobium content.…”

Section: ¹1mentioning

confidence: 99%

“…[1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17] Recently, lithium tin sulfides have attracted substantial attention because of their great potential applications as highly lithium-ion-conducting solid electrolytes. [7][8][9][10][11] For example, LiSnS 2 , 7 Li 2 SnS 3 , [8][9][10] and Li 4 SnS 4 11-13 have been reported.…”

Section: Introductionmentioning

confidence: 99%

“…[8][9][10] We recently obtained lithium titanium sulfide, Li 2 TiS 3 , and lithium niobium sulfide, Li 3 NbS 4 , which had a cubic rocksalt structure, and their solid solutions, which were prepared by mechanochemical synthesis. [14][15][16][17] The lithium transition metal sulfides of cubic Li 2 TiS 3 and Li 3 NbS 4 can be used as electrode active materials for secondary batteries and exhibit high reversible capacities of 400 mAh g ¹1 . Mechanochemical synthesis has an attractive advantage that it is possible to obtain the product in a metastable state, such as materials with amorphous or highly symmetrical crystal structures.…”

Section: Introductionmentioning

confidence: 99%

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Cubic Rocksalt Li2SnS3 and a Solid Solution with Li3NbS4 Prepared by Mechanochemical Synthesis

et al. 2017

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“…Moreover, amorphous metal sulfide electrode such as amorphous TiS 3 [22,23], amorphous TiS 4 [24,25], amorphous NbS x [26,27] showed high capacity in all-solid-state lithium batteries. However, the batteries using the combination of LLZ electrolytes and amorphous transition metal sulfide electrodes have not been reported yet.…”

Section: Introductionmentioning

confidence: 98%