Abstract
The P2-Na2/3MnO2 compound is one of the attractive cathodes for sodium-ion batteries due to its high initial capacity and abundance of Na and Mn elements in nature. The existence of Mn3+ Jahn-Teller ion, however, impedes electrode performance for long term. Here, we challenge to minimize the effect of the Jahn-Teller distortion caused by Mn3+ in the structure, via substitution of Mn3+ by Co3+ in P2-Na2/3[Mn1-xCox]O2 (x = 0-0.3). The P2-Na2/3[Mn0.8Co0.2]O2 compound substantializes the electrochemical performance with a capacity of about 175 mAh g-1 (26 mA g-1) and retained over 90% of its initial capacity for 300 cycles at 0.1 C (26 mA g-1) and 10 C (2.6 A g-1). The operando X-ray diffraction study indicates that a single-phase reaction is associated with the insertion of sodium ions into the structure, accompanied by a small volume change of approximately 3%. Furthermore, ex situ X-ray diffraction and high-resolution transmission electron microscopy results show that the crystal structure remained after 300 continuous cycles. It is believed that such good electrode performances attribute to the structural stabilization assisted by the presence of Co3+ in the crystal structure. Our finding provides a way to take advantage of low-cost Mn-rich cathode materials for sodium-ion batteries.
| Original language | English |
|---|---|
| Pages (from-to) | 28928-28933 |
| Number of pages | 6 |
| Journal | ACS Applied Materials and Interfaces |
| Volume | 11 |
| Issue number | 32 |
| DOIs | |
| Publication status | Published - Aug 14 2019 |
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Keywords
- battery
- cathode
- layer structure
- P2-type
- sodium
- structural stability
ASJC Scopus subject areas
- Materials Science(all)
Cite this
P2-Na2/3MnO2 by Co Incorporation : As a Cathode Material of High Capacity and Long Cycle Life for Sodium-Ion Batteries. / Konarov, Aishuak; Kim, Hee Jae; Voronina, Natalia; Bakenov, Zhumabay; Myung, Seung Taek.
In: ACS Applied Materials and Interfaces, Vol. 11, No. 32, 14.08.2019, p. 28928-28933.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - P2-Na2/3MnO2 by Co Incorporation
T2 - As a Cathode Material of High Capacity and Long Cycle Life for Sodium-Ion Batteries
AU - Konarov, Aishuak
AU - Kim, Hee Jae
AU - Voronina, Natalia
AU - Bakenov, Zhumabay
AU - Myung, Seung Taek
PY - 2019/8/14
Y1 - 2019/8/14
N2 - The P2-Na2/3MnO2 compound is one of the attractive cathodes for sodium-ion batteries due to its high initial capacity and abundance of Na and Mn elements in nature. The existence of Mn3+ Jahn-Teller ion, however, impedes electrode performance for long term. Here, we challenge to minimize the effect of the Jahn-Teller distortion caused by Mn3+ in the structure, via substitution of Mn3+ by Co3+ in P2-Na2/3[Mn1-xCox]O2 (x = 0-0.3). The P2-Na2/3[Mn0.8Co0.2]O2 compound substantializes the electrochemical performance with a capacity of about 175 mAh g-1 (26 mA g-1) and retained over 90% of its initial capacity for 300 cycles at 0.1 C (26 mA g-1) and 10 C (2.6 A g-1). The operando X-ray diffraction study indicates that a single-phase reaction is associated with the insertion of sodium ions into the structure, accompanied by a small volume change of approximately 3%. Furthermore, ex situ X-ray diffraction and high-resolution transmission electron microscopy results show that the crystal structure remained after 300 continuous cycles. It is believed that such good electrode performances attribute to the structural stabilization assisted by the presence of Co3+ in the crystal structure. Our finding provides a way to take advantage of low-cost Mn-rich cathode materials for sodium-ion batteries.
AB - The P2-Na2/3MnO2 compound is one of the attractive cathodes for sodium-ion batteries due to its high initial capacity and abundance of Na and Mn elements in nature. The existence of Mn3+ Jahn-Teller ion, however, impedes electrode performance for long term. Here, we challenge to minimize the effect of the Jahn-Teller distortion caused by Mn3+ in the structure, via substitution of Mn3+ by Co3+ in P2-Na2/3[Mn1-xCox]O2 (x = 0-0.3). The P2-Na2/3[Mn0.8Co0.2]O2 compound substantializes the electrochemical performance with a capacity of about 175 mAh g-1 (26 mA g-1) and retained over 90% of its initial capacity for 300 cycles at 0.1 C (26 mA g-1) and 10 C (2.6 A g-1). The operando X-ray diffraction study indicates that a single-phase reaction is associated with the insertion of sodium ions into the structure, accompanied by a small volume change of approximately 3%. Furthermore, ex situ X-ray diffraction and high-resolution transmission electron microscopy results show that the crystal structure remained after 300 continuous cycles. It is believed that such good electrode performances attribute to the structural stabilization assisted by the presence of Co3+ in the crystal structure. Our finding provides a way to take advantage of low-cost Mn-rich cathode materials for sodium-ion batteries.
KW - battery
KW - cathode
KW - layer structure
KW - P2-type
KW - sodium
KW - structural stability
UR - http://www.scopus.com/inward/record.url?scp=85070714822&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85070714822&partnerID=8YFLogxK
U2 - 10.1021/acsami.9b09317
DO - 10.1021/acsami.9b09317
M3 - Article
VL - 11
SP - 28928
EP - 28933
JO - ACS applied materials & interfaces
JF - ACS applied materials & interfaces
SN - 1944-8244
IS - 32
ER -