Copper-substituted Na0.67Ni0.3−xCuxMn0.7O2 cathode materials for sodium-ion batteries with suppressed P2–O2 phase transition

2017 ◽  
Vol 5 (18) ◽  
pp. 8752-8761 ◽  
Author(s):  
Lei Wang ◽  
Yong-Gang Sun ◽  
Lin-Lin Hu ◽  
Jun-Yu Piao ◽  
Jing Guo ◽  
...  
Keyword(s):  
Phase Transition ◽  
Phase Transitions ◽  
Transition Metal ◽  
Cathode Materials ◽  
Structural Evolution ◽  
Sodium Ion ◽  
Sodium Ion Batteries ◽  
Metal Lattice

In situ XRD resolves the structural evolution of the Na–Cu/Ni/Mn–O system during the Na intercalation/deintercalation processes. The introduction of Cu2+ into the transition metal lattice is an strategy to prevent P2–O2 phase transitions.

scholarly journals Tuning local chemistry of P2 layered-oxide cathode for high energy and long cycles of sodium-ion battery

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Chenchen Wang ◽  
Luojia Liu ◽  
Shuo Zhao ◽  
Yanchen Liu ◽  
Yubo Yang ◽  
...  
Keyword(s):  
Phase Transition ◽  
Transition Metal ◽  
Metal Oxides ◽  
Transition Metal Oxides ◽  
Cathode Materials ◽  
Specific Capacity ◽  
High Energy ◽  
Sodium Ion ◽  
Sodium Ion Batteries ◽  
Two Phase

AbstractLayered transition-metal oxides have attracted intensive interest for cathode materials of sodium-ion batteries. However, they are hindered by the limited capacity and inferior phase transition due to the gliding of transition-metal layers upon Na+ extraction and insertion in the cathode materials. Here, we report that the large-sized K+ is riveted in the prismatic Na+ sites of P2-Na0.612K0.056MnO2 to enable more thermodynamically favorable Na+ vacancies. The Mn-O bonds are reinforced to reduce phase transition during charge and discharge. 0.901 Na+ per formula are reversibly extracted and inserted, in which only the two-phase transition of P2 ↔ P’2 occurs at low voltages. It exhibits the highest specific capacity of 240.5 mAh g−1 and energy density of 654 Wh kg−1 based on the redox of Mn3+/Mn4+, and a capacity retention of 98.2% after 100 cycles. This investigation will shed lights on the tuneable chemical environments of transition-metal oxides for advanced cathode materials and promote the development of sodium-ion batteries.

In situ TEM and half cell investigation of sodium storage in hexagonal FeSe nanoparticles

2019 ◽  
Vol 55 (39) ◽  
pp. 5611-5614 ◽  
Author(s):  
Kai Wu ◽  
Fei Chen ◽  
Zhongtao Ma ◽  
Bingkun Guo ◽  
Yingchun Lyu ◽  
...  
Keyword(s):  
Phase Transition ◽  
Electrochemical Performance ◽  
Tetragonal Phase ◽  
Sodium Ion ◽  
In Situ Tem ◽  
Sodium Ion Batteries ◽  
Half Cell ◽  
Sodium Storage

A hexagonal FeSe anode for sodium-ion batteries shows desirable electrochemical performance with an irreversible phase transition from the hexagonal to tetragonal phase.

Na2.3Cu1.1Mn2O7−δ nanoflakes as enhanced cathode materials for high-energy sodium-ion batteries achieved by a rapid pyrosynthesis approach

2020 ◽  
Vol 8 (2) ◽  
pp. 770-778 ◽  
Author(s):  
Vaiyapuri Soundharrajan ◽  
Balaji Sambandam ◽  
Muhammad H. Alfaruqi ◽  
Sungjin Kim ◽  
Jeonggeun Jo ◽  
...  
Keyword(s):  
Cathode Materials ◽  
Single Phase ◽  
High Energy ◽  
Positive Electrode ◽  
Sodium Ion ◽  
Sodium Ion Batteries ◽  
Phase Reaction

Na2.3Cu1.1Mn2O7−δ nanoflakes prepared by an ultrafast pyrosynthesis approach are used as the positive electrode for SIBs. In situ GITT and XRD results support the occurrence of a single-phase reaction in the Na2.3Cu1.1Mn2O7−δ nanoflakes cathode during Na+ (de)intercalation.

Contribution of titanium substitution on improving the electrochemical properties of P2-Na0.67Ni0.33Mn0.67O2 cathode material for sodium-ion storage

2020 ◽  
Vol 13 (03) ◽  
pp. 2051010
Author(s):  
Zhijie Cao ◽  
Lijiang Li ◽  
Chaojin Zhou ◽  
Xiaobo Ma ◽  
Hailong Wang
Keyword(s):  
Electrochemical Properties ◽  
Structural Evolution ◽  
Extraction Process ◽  
Sodium Ion ◽  
Electrochemical Performances ◽  
Sodium Ion Batteries ◽  
X Ray Diffraction ◽  
Vacancy Ordering ◽  
Ti Substitution

P2-type Na[Formula: see text]Ni[Formula: see text]Mn[Formula: see text]TixO2[Formula: see text] have been synthesized as cathode materials for sodium-ion batteries, and the effect of Ti substitution on the structural evolution and electrochemical properties of Na[Formula: see text]Ni[Formula: see text]Mn[Formula: see text]O2 are investigated in detail. Analysis results indicate that an appropriate substituted amount of Mn with Ti in the MO2 layers effectively stabilize the crystal lattice of these layered electrodes during the Na[Formula: see text] insertion/extraction process, which significantly improves their electrochemical performances between 2.5 and 4.4[Formula: see text]V. The discharge/charge patterns and in situ X-ray diffraction measurements expound the successful suppression of Na[Formula: see text]/vacancy ordering and multiphase transition during the de-sodiation/sodiation process to resist the structure-induced degradation, which provide possible guidelines for exploring high performances sodium-ion batteries.

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