Design and Comparative Study of O3/P2 Hybrid Structures for Room Temperature Sodium-Ion Batteries

Qi, Xiangdong; Liu, Lilu; Song, Ningning; Gao, Fei; Yang, Kai; Lu, Yaxiang; Yang, Haitao; Hu, Yong‐Sheng; Cheng, Ziqiang; Chen, Liquan

doi:10.1021/acsami.7b11282

Cited by 118 publications

(85 citation statements)

References 39 publications

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“…These phase transitions and stacking faults result in an increased disorder and strain within the material as indicated by the increasing full width at half maximum (FWHM) of the ( 0 0 l ) reflections—especially at voltages around 4.2 V. However, the FWHM and intensity of these reflections are similar at OCV and at the end of discharge (2.5 V), suggesting very reversible phase transitions overall. These findings for P2/P3/O3‐Na x Mn 0.5 Ni 0.3 Fe 0.1 Mg 0.1 O 2 are in good agreement with the phase transitions reported previously for P2/O3‐type Na 0.78 Ni 0.2 Fe 0.38 Mn 0.42 O 2 , which has a very similar structural and chemical composition. Differently, the P2/O3‐type intergrowth Na 0.7 Li 0.3 Ni 0.5 Mn 0.5 O 2 , studied by Lee et al, showed less phase transitions, which is attributed to the incorporated lithium that prevents extensive structural changes upon electrochemical cycling.…”

Section: Resultssupporting

confidence: 92%

In Situ Investigation of Layered Oxides with Mixed Structures for Sodium‐Ion Batteries

et al. 2019

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Experimentalists and theoreticians commonly prefer single‐phase materials for their studies, since this allows for a direct correlation of the findings obtained and the compound studied. For the design of high‐performance materials for energy applications, however, mixtures of different phases frequently reveal an advanced set of desired properties. Recently, it has been shown that a combination of different phases, that is, P2/P3/O3‐ NaxMn0.5Ni0.3Fe0.1Mg0.1O2, allows for higher capacities and enhanced cycling stability when employed as sodium‐on cathode compared to pure P2‐NaxMn0.7Ni0.1Fe0.1Mg0.1O2 or O3‐type NaxMn0.5Ni0.3Fe0.1Mg0.1O2. Herein, the in‐depth comparative investigation of these three materials is presented via in situ X‐ray diffraction and X‐ray absorption spectroscopy coupled with electrochemical techniques to fully elucidate the origin of this superior performance. In fact, it appears that the redox activity or inactivity of the manganese cation plays a decisive role for the reversibility of the sodium‐ion uptake and release.

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Section: Resultssupporting

confidence: 92%

In Situ Investigation of Layered Oxides with Mixed Structures for Sodium‐Ion Batteries

et al. 2019

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“…The rate capacity is also increased, as the capacity at 1200 mA g −1 is raised from 15 to 65 mAh g −1 . A step further, Qi et al reported a series of P2–O3 Na x Ni 0.2 Fe x −0.4 Mn 1.2− x O 2 composites, and tuned the Fe/Mn ratio to balance the P2–O3 composition for optimal capacity, cyclic stability, and rate capability . In situ XRD analyses of the initial charge and discharge confirm reversible phase transformation of O3–P3–O3′ between 2.5 and 4.0 V (Figure d).…”

Section: Sibsmentioning

confidence: 91%

“…d) XRD patterns and corresponding crystal phases of Na x Ni 0.2 Fe x −0.4 Mn 1.2− x O 2 (NNFM) with various Na contents (0.7–1.0) and the resulting phase evolution; e) cyclic stability and f) rate capability of Na 0.78 Ni 0.2 Fe 0.38 Mn 0.42 O 2 (NNFM–0.78). Reproduced with permission . Copyright 2017, American Chemical Society.…”

Section: Sibsmentioning

confidence: 99%

Layer‐Based Heterostructured Cathodes for Lithium‐Ion and Sodium‐Ion Batteries

Deng

Liang

et al. 2019

Adv Funct Materials

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A critical bottleneck that hinders major performance improvement in lithium-ion and sodium-ion batteries is the inferior electrochemical activity of their cathode materials. While significant research progresses have been made, conventional single-phase cathodes are still limited by intrinsic deficiencies such as low reversible capacity, enormous initial capacity loss, rapid capacity decay, and poor rate capability. In the past decade, layer-based heterostructured cathodes acquired by combining multiple crystalline phases have emerged as candidates with a huge potential to realize performance breakthrough. Herein, recent studies on the structural properties, electrochemical behaviors, and synthesis route optimizations of these heterostructured cathodes are summarized for in-depth discussions. Particular attention is paid to the latest mechanism discoveries and performance achievements. This review thus aims to promote a deeper understanding of the correlation between the crystal structure of cathodes and their electrochemical behavior, and offers guidance to design advance cathode materials from the aspect of crystal structure engineering.

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“…The electrochemical performance of this CSM shows the advantages of this material. Recently, another CSM of Na x Ni 0.2 Fe x −0.4 Mn 1.2− x O 2 (0.7 < x < 1.0) with a P2‐type and O3‐type hybrid structure was designed with different Na contents . The Rietveld refinement results and TEM images showed that the fraction of the P2‐type structure gradually decreased, while the fraction of the O3‐type structure increased (Figure b) as the Na content increased for the same heating process (950 °C).…”

Section: Structure Design and Adjustment Of Csmsmentioning

confidence: 99%

Composite‐Structure Materials for Na‐Ion Batteries

2018

Small Methods

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structure materials, [25][26][27][28][29][30][31][32][33] polyanion-based materials, [34][35][36][37][38][39][40][41][42][43][44][45][46][47][48][49][50] alloying materials, [9,[51][52][53][54][55][56] and Prussian blue analogs. [57][58][59][60][61] However, most of these developed materials are classified as single crystalline structures and exhibit limited electrochemical performances. Thus, scientists have started to think about developing a new material system that possesses the advantages of multiple materials in one material. An attractive strategy to accomplish this goal is the composite-structure material system, which has received much attention recently. [62][63][64] Compared with single-structure materials, compositestructure materials (CSMs) always exhibit better comprehensive electrochemical performance, e.g., larger reversible capacities and better cycling or rate performance. [65,66] The best example of a CSM has been studied in LIBs for many years, i.e., lithium-manganese-rich layered oxides (LLOs), [67][68][69][70] which possess both layered rhombohedral structures and mono clinic Li 2 MnO 3 -like structures. These CSMs deliver a high discharge capacity of ≈300 mAh g −1 and a high energy density of ≈1000 Wh kg −1 , which are almost two times larger than those of conventional cathode materials for LIBs.Electrode materials for NIBs are mostly derived from LIBs. Recently, some CSMs have been proposed to create NIBs with high electrochemical performance, exhibiting great potential in high-energy-density devices. However, most published CSMs are identified after the synthesis process, and few studies have been conducted on designing CSMs because of the complexity of their crystalline structure. In addition, characterizing all the structures in CSMs is more difficult than characterizing singlestructure materials. Currently, adjusting structural proportions and further balancing the electrochemical performance of CSMs still remain major challenges. Examining the literature, a detailed review of CSMs used in NIBs is lacking. In this work, research development of CSMs for NIBs is conducted based on the crystalline structure, including structure design, identification, and adjustment. Some important work and recent achievements on CSMs with a future outlook based on a mechanism analysis are also reviewed. By reviewing previous important studies on CSMs, a new electrode-material structure system for NIBs is established in this work. Structures in CSMsMost NIB electrode materials are developed based on LIB materials because the batteries have similar mechanisms. [1,3,4] Due to the growing concern of aggravated environmental problems (air pollution, global warming, etc.) and Li resources, Na-ion batteries have received significant attention as a promising alternative. Many electrode materials for Na-ion batteries have been reported in the past, especially over the past five years. However, most of these materials have a single crystalline structure and exhibit a limited electrochemical performance. Recently,...

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Design and Comparative Study of O3/P2 Hybrid Structures for Room Temperature Sodium-Ion Batteries

Cited by 118 publications

References 39 publications

In Situ Investigation of Layered Oxides with Mixed Structures for Sodium‐Ion Batteries

In Situ Investigation of Layered Oxides with Mixed Structures for Sodium‐Ion Batteries

Layer‐Based Heterostructured Cathodes for Lithium‐Ion and Sodium‐Ion Batteries

Composite‐Structure Materials for Na‐Ion Batteries

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