Abstract
The Li 2Mn 0.5Fe 0.5SiO 4 silicate was prepared by blending of Li 2MnSiO 4 and Li 2FeSiO 4 precursors with same molar ratio. The one of the silicates of Li 2MnSiO 4 is known as high capacitive up to ∼330 mAh/g due to 2 mole electron exchange, and the other of Li 2FeSiO 4 has identical structure with Li 2MnSiO 4 and shows stable cycle with less capacity of ∼170 mAh/g. The major drawback of silicate family is low electronic conductivity (3 orders of magnitude lower than LiFePO 4). To overcome this disadvantage, carbon composite of the silicate compound was prepared by sucrose mixing with silicate precursors and heat-treated in reducing atmosphere. The crystal structure and physical morphology of Li 2Mn 0.5Fe 0.5SiO 4 was investigated by X-ray diffraction, scanning electron microscopy, and high resolution transmission electron microscopy. The Li 2Mn 0.5Fe 0.5SiO 4/C nanocomposite has a maximum discharge capacity of 200 mAh/g, and 63% of its discharge capacity is retained after the tenth cycles. We have realized that more than 1 mole of electrons are exchanged in Li 2Mn 0.5Fe 0.5SiO 4. We have observed that Li 2Mn 0.5Fe 0.5SiO 4 is unstable structure upon first delithiation with structural collapse. High temperature cell performance result shows high capacity of discharge capacity (244 mAh/g) but it had poor capacity retention (50%) due to the accelerated structural degradation and related reaction.
| Original language | English |
|---|---|
| Pages (from-to) | 4205-4209 |
| Number of pages | 5 |
| Journal | Bulletin of the Korean Chemical Society |
| Volume | 32 |
| Issue number | 12 |
| DOIs | |
| Publication status | Published - 2011 Dec 20 |
| Externally published | Yes |
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Keywords
- Cathode
- Lithium manganese iron silicate
- Lithium-ion battery
- Physical blending
- Polyanion system
ASJC Scopus subject areas
- Chemistry(all)
Cite this
Structural and electrochemical properties of Li 2Mn 0.5Fe 0.5SiO 4/C cathode nanocomposite. / Chung, Youngmin; Yu, Seung-Ho; Song, Min Seob; Kim, Sung Soo; Cho, Won Il.
In: Bulletin of the Korean Chemical Society, Vol. 32, No. 12, 20.12.2011, p. 4205-4209.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Structural and electrochemical properties of Li 2Mn 0.5Fe 0.5SiO 4/C cathode nanocomposite
AU - Chung, Youngmin
AU - Yu, Seung-Ho
AU - Song, Min Seob
AU - Kim, Sung Soo
AU - Cho, Won Il
PY - 2011/12/20
Y1 - 2011/12/20
N2 - The Li 2Mn 0.5Fe 0.5SiO 4 silicate was prepared by blending of Li 2MnSiO 4 and Li 2FeSiO 4 precursors with same molar ratio. The one of the silicates of Li 2MnSiO 4 is known as high capacitive up to ∼330 mAh/g due to 2 mole electron exchange, and the other of Li 2FeSiO 4 has identical structure with Li 2MnSiO 4 and shows stable cycle with less capacity of ∼170 mAh/g. The major drawback of silicate family is low electronic conductivity (3 orders of magnitude lower than LiFePO 4). To overcome this disadvantage, carbon composite of the silicate compound was prepared by sucrose mixing with silicate precursors and heat-treated in reducing atmosphere. The crystal structure and physical morphology of Li 2Mn 0.5Fe 0.5SiO 4 was investigated by X-ray diffraction, scanning electron microscopy, and high resolution transmission electron microscopy. The Li 2Mn 0.5Fe 0.5SiO 4/C nanocomposite has a maximum discharge capacity of 200 mAh/g, and 63% of its discharge capacity is retained after the tenth cycles. We have realized that more than 1 mole of electrons are exchanged in Li 2Mn 0.5Fe 0.5SiO 4. We have observed that Li 2Mn 0.5Fe 0.5SiO 4 is unstable structure upon first delithiation with structural collapse. High temperature cell performance result shows high capacity of discharge capacity (244 mAh/g) but it had poor capacity retention (50%) due to the accelerated structural degradation and related reaction.
AB - The Li 2Mn 0.5Fe 0.5SiO 4 silicate was prepared by blending of Li 2MnSiO 4 and Li 2FeSiO 4 precursors with same molar ratio. The one of the silicates of Li 2MnSiO 4 is known as high capacitive up to ∼330 mAh/g due to 2 mole electron exchange, and the other of Li 2FeSiO 4 has identical structure with Li 2MnSiO 4 and shows stable cycle with less capacity of ∼170 mAh/g. The major drawback of silicate family is low electronic conductivity (3 orders of magnitude lower than LiFePO 4). To overcome this disadvantage, carbon composite of the silicate compound was prepared by sucrose mixing with silicate precursors and heat-treated in reducing atmosphere. The crystal structure and physical morphology of Li 2Mn 0.5Fe 0.5SiO 4 was investigated by X-ray diffraction, scanning electron microscopy, and high resolution transmission electron microscopy. The Li 2Mn 0.5Fe 0.5SiO 4/C nanocomposite has a maximum discharge capacity of 200 mAh/g, and 63% of its discharge capacity is retained after the tenth cycles. We have realized that more than 1 mole of electrons are exchanged in Li 2Mn 0.5Fe 0.5SiO 4. We have observed that Li 2Mn 0.5Fe 0.5SiO 4 is unstable structure upon first delithiation with structural collapse. High temperature cell performance result shows high capacity of discharge capacity (244 mAh/g) but it had poor capacity retention (50%) due to the accelerated structural degradation and related reaction.
KW - Cathode
KW - Lithium manganese iron silicate
KW - Lithium-ion battery
KW - Physical blending
KW - Polyanion system
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UR - http://www.scopus.com/inward/citedby.url?scp=84255184102&partnerID=8YFLogxK
U2 - 10.5012/bkcs.2011.32.12.4205
DO - 10.5012/bkcs.2011.32.12.4205
M3 - Article
VL - 32
SP - 4205
EP - 4209
JO - Bulletin of the Korean Chemical Society
JF - Bulletin of the Korean Chemical Society
SN - 0253-2964
IS - 12
ER -