IHEP OpenIR
Li-Substituted Co-Free Layered P2/O3 Biphasic Na0.67Mn0.55Ni0.25Ti0.2-xLixO2 as High-Rate-Capability Cathode Materials for Sodium Ion Batteries
Li, ZY; Zhang, JC; Gao, R; Zhang, H; Zheng, LR; Hu, ZB; Liu, XF; Zheng LR(郑黎荣)
2016
Source PublicationJOURNAL OF PHYSICAL CHEMISTRY C
ISSN1932-7447
EISSN1932-7455
Volume120Issue:17Pages:9007-9016
SubtypeArticle
AbstractThe effects of Li substitution for Ti on the structure and electrochemical performances of Co-free Na-0.67-Mn0.55Ni0.25Ti0.2-xLixO2 (x = 0, 0.1, 0.2) layered cathode materials for sodium ion batteries have been comprehensively investigated. X-ray diffraction and Rietveld refinement results demonstrate that Li mainly occupies TM (TM = transition metal) sites in the crystal structure to maintain the P2 structure majority and a small amount of Li atoms enter Na sites to generate some O-3 phase. The discharge voltage, reversible capacity, rate capability, cycling performance, and Coulombic efficiency all have been improved by Li substitution, which can be largely attributed to the integration of P2 and O3. Li substitution also raises the average discharge voltage from 2.6 to 3.1 V. Na0.67Mn0.55Ni0.25Li0.2O2 (L02) can deliver an initial capacity of about 158 mA h g(-1) at 0.05C (12 mA g(-1)) in comparison with the Li-free sample (147 mA h g(-1)). Even at the high rates of 480 (2C), 1200 (5C), and 1920 (8C) mA g(-1), L02 can also display ca. 93, 65, and 38 mA h g(-1) discharge capacities, respectively. The rate capability is higher than what is reported in the previous Li-substituted cathode materials. In addition, Li substitution in transition-metal sites generates more defects to maintain the charge neutrality, which enhances the electronic conductivity and also has a positive effect on the Na ion diffusion coefficient. The electronic conductivity and Na ion diffusion coefficient have been enhanced by 122% and 29%, respectively, with the substitution of Li for Ti. Our results also show that the oxidation peaks become sharper with increasing Li content, which indicates the feasibility of Na ion intercalation/deintercalation in the integrated P2/O3 phase. This study also offers some new insights into designing high-performance cathode materials for sodium ion batteries.
DOI10.1021/acs.jpcc.5b11983
Indexed BySCI
Language英语
WOS IDWOS:000375631100001
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ihep.ac.cn/handle/311005/248103
Collection中国科学院高能物理研究所
Recommended Citation
GB/T 7714
Li, ZY,Zhang, JC,Gao, R,et al. Li-Substituted Co-Free Layered P2/O3 Biphasic Na0.67Mn0.55Ni0.25Ti0.2-xLixO2 as High-Rate-Capability Cathode Materials for Sodium Ion Batteries[J]. JOURNAL OF PHYSICAL CHEMISTRY C,2016,120(17):9007-9016.
APA Li, ZY.,Zhang, JC.,Gao, R.,Zhang, H.,Zheng, LR.,...&郑黎荣.(2016).Li-Substituted Co-Free Layered P2/O3 Biphasic Na0.67Mn0.55Ni0.25Ti0.2-xLixO2 as High-Rate-Capability Cathode Materials for Sodium Ion Batteries.JOURNAL OF PHYSICAL CHEMISTRY C,120(17),9007-9016.
MLA Li, ZY,et al."Li-Substituted Co-Free Layered P2/O3 Biphasic Na0.67Mn0.55Ni0.25Ti0.2-xLixO2 as High-Rate-Capability Cathode Materials for Sodium Ion Batteries".JOURNAL OF PHYSICAL CHEMISTRY C 120.17(2016):9007-9016.
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