P2 – Type Na0.67Mn0.8Cu0.1Mg0.1O2 as a new cathode material for sodium-ion batteries: Insights of the synergetic effects of multi-metal substitution and electrolyte optimization

Li, Jie; Wang, Jun; He, Xin; Zhang, Li; Senyshyn, Anatoliy; Yan, Bo; Muehlbauer, M.; Cao, Xia; Vortmann-Westhoven, Britta; Kraft, Vadim; Liu, Haidong; Luerenbaum, Constantin; Schumacher, G.; Paillard, Elie; Winter, Martin; Li, Jie

doi:10.1016/j.jpowsour.2019.01.086

Cited by 52 publications

(34 citation statements)

References 76 publications

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“…In the EXAFS spectra, an additional peak around 0.98 Å was observed for the pristine sample, while there was no additional peak for the Zn‐doped sample, indicating that the Jahn‐Teller distortion was suppressed to a certain degree (Figure a–c). Multiple element doping can also reduce the Jahn‐Teller effect . Ma's group employed operando transmission X‐ray microscopy (TXM) techniques and ex‐situ XANES spectra to investigate a proposed nonequilibrium solid solution of Na 1–δ Ni 1/3 Fe 1/3 Mn 1/3 O 2 .…”

Section: Xas Techniques For Sodium Layered Transition Metal Oxidessupporting

confidence: 93%

Understanding Challenges of Cathode Materials for Sodium‐Ion Batteries using Synchrotron‐Based X‐Ray Absorption Spectroscopy

Chen

Chou

Dou

2019

Batteries & Supercaps

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An in-depth understanding of the electrochemical behavior of cathode materials in a complex chemical environment is critical for the development of state-of-the-art sodium-ion batteries. Advanced synchrotron-based characterization is a powerful tool for collecting valuable information on complicated reaction mechanisms. X-ray absorption spectroscopy can be used to precisely monitor the valence state and corresponding changes during cycling of various elements. Information on the local structure, such as coordination number and bond information can also be extracted from the fitting data in Fourier transform extended X-ray absorption fine structure. In this review, we summarize findings on state-of-the-art cathode materials using ex-situ/in-situ X-ray absorption spectroscopy to probe fundamental discoveries on sodium-ion battery systems and what important and valuable results have been obtained. Further possible improvements and practical operating advice are also discussed in detail. . (a) Crystal structure of Na 3 V 2 (PO 4 ) 2 F 3 with space group Amam. (b) V K-edge XANES spectra at C/10. Reprinted with permission from (a) to (b). [51] Copyright 2017American Chemical Society. (c) Crystal structure of ɛ-VOPO 4 and corresponding charge/discharge curve. V K-edge in-situ XAS spectra of Mo 0.05 V 0.95 OPO 4 for (d) high-voltage discharge and (e) low-voltage discharge.

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Section: Xas Techniques For Sodium Layered Transition Metal Oxidessupporting

confidence: 93%

Understanding Challenges of Cathode Materials for Sodium‐Ion Batteries using Synchrotron‐Based X‐Ray Absorption Spectroscopy

Chen

Chou

Dou

2019

Batteries & Supercaps

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“…Furthermore, the use of suitable additives remarkably enhanced the electrode passivation behavior, leading to promising cell performances. Indeed, literature works have shown that vinylene carbonate (VC), fluoroethylene carbonate (FEC), and lithium nitrate (LiNO 3 ) may improve the SEI between anode and electrolyte. In particular, it is widely demonstrated that LiNO 3 ‐containing electrolytes may form a uniform and stable anode passivation layer containing both organic ( e.g ., ROLi and ROCO 2 Li) and inorganic ( e.g ., Li x NO y , Li 3 N, and Li 2 O) species, which can mitigate the parasitic reactions in the cell and limit the lithium dendrite growth .…”

Section: Introductionmentioning

confidence: 99%

Towards a High‐Performance Lithium‐Metal Battery with Glyme Solution and an Olivine Cathode

et al. 2020

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High‐performance lithium‐metal batteries are achieved by using a glyme‐based electrolyte enhanced with a LiNO3 additive and a LiFePO4 cathode. An optimal electrolyte formulation is selected upon detailed analysis of the electrochemical properties of various solutions formed by dissolving respectively lithium bis(fluorosulfonyl)imide (LiFSI), lithium bis(trifluoromethanesulfonyl)imide (LiTFSI), and lithium bis(pentafluoroethanesulfonyl)imide (LiBETI) either in diethylene glycol dimethyl ether or in triethylene glycol dimethyl ether and by adding LiNO3. A thorough investigation shows evidence of efficient ionic transport, a wide stability window, low reactivity with lithium metal, and cathode/electrolyte interphase characteristics that are strongly dependent on the glyme chain length. The best Li/LiFePO4 battery delivers 154 mAh g−1 at C/3 (1 C=170 mA g−1) without any decay after 200 cycles. Tests at 1 C and 5 C show initial capacities of about 150 and 140 mAh g−1, a retention exceeding 70 % after 500 cycles, and suitable electrode/electrolyte interphases evolution.

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“…This feature demonstrates the higher discharge contribution of Mg‐NMFO in the range of 4.2–2.75 V compared with NMFO. Generally, Mg‐NMFO exhibited broader and lower‐intensity d Q /d V features compared with NMFO, indicating less structural strain during electrochemical reactions [34,35] …”

Section: Resultsmentioning

confidence: 98%

“…Generally, Mg-NMFO exhibited broader and lower-intensity dQ/dV features compared with NMFO, indicating less structural strain during electrochemical reactions. [34,35] A long-term cycling test at 0.1 C was performed to evaluate the effect of Mg substitution on cycling stability as shown in Figure 3d-f. Mg-NMFO exhibits 144 mAh g À 1 of discharge capacity after 100 cycles corresponding to 78 % of its initial capacity. These values are much higher than those of NMFO, only 88 mAh g À 1 of capacity after 100 cycles and 47 % capacity retention.…”

Section: Electrochemistrymentioning

confidence: 99%

Structural Stabilization of P2‐type Sodium Iron Manganese Oxides by Electrochemically Inactive Mg Substitution: Insights of Redox Behavior and Voltage Decay

et al. 2020

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Layered P2-type Na 0.8 Mn 0.5 Fe 0.5 O 2 cathode material is a promising candidate for next-generation sodium-ion batteries due to the economical and environmentally benign characteristics of Mn and Fe. The poor cycling stability of the material, however, is still a problem that must be solved. To address the problem, electrochemically inactive Mg 2 + was introduced into the structure by substituting some of the Fe ions. It was shown that Mg substitution led to a smoother voltage profile with improved cycling performance and rate capability. These observations were attributed to the suppressed structural changes during electrochemical processes. Detailed redox mechanisms, associated local structural changes, and phase transitions were investigated by X-ray absorption spectroscopy and X-ray diffraction. From the detailed analysis of electrochemical behaviors, it was also identified how the redox reactions and structural disordering occurred in the high-and low-voltage regions and how Mg substitution stabilized the structure.

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P2 – Type Na0.67Mn0.8Cu0.1Mg0.1O2 as a new cathode material for sodium-ion batteries: Insights of the synergetic effects of multi-metal substitution and electrolyte optimization

Cited by 52 publications

References 76 publications

Understanding Challenges of Cathode Materials for Sodium‐Ion Batteries using Synchrotron‐Based X‐Ray Absorption Spectroscopy

Understanding Challenges of Cathode Materials for Sodium‐Ion Batteries using Synchrotron‐Based X‐Ray Absorption Spectroscopy

Towards a High‐Performance Lithium‐Metal Battery with Glyme Solution and an Olivine Cathode

Structural Stabilization of P2‐type Sodium Iron Manganese Oxides by Electrochemically Inactive Mg Substitution: Insights of Redox Behavior and Voltage Decay

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