Abstract
We decorated nano-crystalline LiNbO3 (LN) particles, which played the role of artificial solid electrolyte interfaces (SEIs) on an active material, namely LiCoO2 (LC). Conventional one-step synthesis using metal organic decomposition (MOD) was used initially, but resulted in the presence of an undesired Li-rich compound, Li3NbO4 (L3N), along with a counterpart phase, Co3O4. Hence, we incorporated crystalline LN into the LC matrix via a two-step synthesis method. Treatment at 500–700 °C resulted in single-phase LN-decorated LCs with improved high rate capabilities. The improvement in the rate capability is related to the temperature dependencies of the two most important parameters: 1) the degree of LN crystallinity, which corresponds to the improvement in the polarization, and 2) the density of the triple phase junctions, which act as active Li ion pathways. The optimized capacity, 78 mAh/g at 20 C, of the specimen annealed at 600 °C was 20 C, which is approximately 1.7-fold larger than that of amorphous LN-decorated LC and is 2.6 times higher than that of bare LC. This implied the introduction of a dielectric polarization architecture had a greater impact on the improvement to the rate capability than Li transportation through the amorphous LN.
| Original language | English |
|---|---|
| Pages (from-to) | 57-60 |
| Number of pages | 4 |
| Journal | Solid State Ionics |
| Volume | 314 |
| DOIs | |
| Publication status | Published - Jan 1 2018 |
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ASJC Scopus subject areas
- Chemistry(all)
- Materials Science(all)
- Condensed Matter Physics
Cite this
Synthesis of nano-crystalline LiNbO3-decorated LiCoO2 and resulting high-rate capabilities. / Teranisi, Takasi; Inohara, Masahiro; Kano, Jun; Hayashi, Hidetaka; Kishimoto, Akira; Yoda, Koji; Motobayashi, Hidefumi; Tasaki, Yuzo.
In: Solid State Ionics, Vol. 314, 01.01.2018, p. 57-60.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Synthesis of nano-crystalline LiNbO3-decorated LiCoO2 and resulting high-rate capabilities
AU - Teranisi, Takasi
AU - Inohara, Masahiro
AU - Kano, Jun
AU - Hayashi, Hidetaka
AU - Kishimoto, Akira
AU - Yoda, Koji
AU - Motobayashi, Hidefumi
AU - Tasaki, Yuzo
PY - 2018/1/1
Y1 - 2018/1/1
N2 - We decorated nano-crystalline LiNbO3 (LN) particles, which played the role of artificial solid electrolyte interfaces (SEIs) on an active material, namely LiCoO2 (LC). Conventional one-step synthesis using metal organic decomposition (MOD) was used initially, but resulted in the presence of an undesired Li-rich compound, Li3NbO4 (L3N), along with a counterpart phase, Co3O4. Hence, we incorporated crystalline LN into the LC matrix via a two-step synthesis method. Treatment at 500–700 °C resulted in single-phase LN-decorated LCs with improved high rate capabilities. The improvement in the rate capability is related to the temperature dependencies of the two most important parameters: 1) the degree of LN crystallinity, which corresponds to the improvement in the polarization, and 2) the density of the triple phase junctions, which act as active Li ion pathways. The optimized capacity, 78 mAh/g at 20 C, of the specimen annealed at 600 °C was 20 C, which is approximately 1.7-fold larger than that of amorphous LN-decorated LC and is 2.6 times higher than that of bare LC. This implied the introduction of a dielectric polarization architecture had a greater impact on the improvement to the rate capability than Li transportation through the amorphous LN.
AB - We decorated nano-crystalline LiNbO3 (LN) particles, which played the role of artificial solid electrolyte interfaces (SEIs) on an active material, namely LiCoO2 (LC). Conventional one-step synthesis using metal organic decomposition (MOD) was used initially, but resulted in the presence of an undesired Li-rich compound, Li3NbO4 (L3N), along with a counterpart phase, Co3O4. Hence, we incorporated crystalline LN into the LC matrix via a two-step synthesis method. Treatment at 500–700 °C resulted in single-phase LN-decorated LCs with improved high rate capabilities. The improvement in the rate capability is related to the temperature dependencies of the two most important parameters: 1) the degree of LN crystallinity, which corresponds to the improvement in the polarization, and 2) the density of the triple phase junctions, which act as active Li ion pathways. The optimized capacity, 78 mAh/g at 20 C, of the specimen annealed at 600 °C was 20 C, which is approximately 1.7-fold larger than that of amorphous LN-decorated LC and is 2.6 times higher than that of bare LC. This implied the introduction of a dielectric polarization architecture had a greater impact on the improvement to the rate capability than Li transportation through the amorphous LN.
UR - http://www.scopus.com/inward/record.url?scp=85035076354&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85035076354&partnerID=8YFLogxK
U2 - 10.1016/j.ssi.2017.11.020
DO - 10.1016/j.ssi.2017.11.020
M3 - Article
AN - SCOPUS:85035076354
VL - 314
SP - 57
EP - 60
JO - Solid State Ionics
JF - Solid State Ionics
SN - 0167-2738
ER -