scholarly journals CeO2-modified P2–Na–Co–Mn–O cathode with enhanced sodium storage characteristics

RSC Advances ◽  
2018 ◽  
Vol 8 (43) ◽  
pp. 24143-24153 ◽  
Author(s):  
Yanzhi Wang ◽  
Jiantao Tang
Keyword(s):  
Discharge Capacity ◽  
Cycling Stability ◽  
Maximum Discharge ◽  
Storage Characteristics ◽  
Sodium Storage

The CeO2 modification significantly enhances the maximum discharge capacity and cycling stability of a P2–Na0.67Co0.25Mn0.75O2 cathode.

Effect of sulfur doping on structural reversibility and cycling stability of a Li2MnSiO4 cathode material

2018 ◽  
Vol 47 (35) ◽  
pp. 12337-12344 ◽  
Author(s):  
Xia Wu ◽  
Shi-Xi Zhao ◽  
Lü-Qiang Yu ◽  
Jin-Lin Yang ◽  
Ce-Wen Nan
Keyword(s):  
Cathode Material ◽  
Discharge Capacity ◽  
Cycling Stability ◽  
Initial Discharge Capacity ◽  
Sulfur Doping ◽  
Initial Discharge ◽  
Excellent Cycling Stability

Sulfur has been successfully employed into Li2MnSiO4 and results in a high initial discharge capacity and excellent cycling stability.

Effect of Content of Mg on the Electrochemical Performance of La1-xMgxNi2.8Co0.7 (x=0.1, 0.3, 0.5) Hydrogen Storage Alloy

2010 ◽  
Vol 113-116 ◽  
pp. 2129-2133
Author(s):  
Jing Wang ◽  
Dao Bin Mu ◽  
Feng Wu ◽  
Shi Chen
Keyword(s):  
Hydrogen Storage ◽  
Electrochemical Performance ◽  
Discharge Capacity ◽  
Hydrogen Storage Alloy ◽  
Diffusion Method ◽  
Capacity Retention ◽  
Solid Diffusion ◽  
Maximum Discharge

La1-xMgxNi2.8Co0.7 (x=0.1, 0.3, 0.5) hydrogen storage alloy was synthesized by solid diffusion method. The microstructure of the alloy was analyzed by XRD when the content of Mg was changed. When x equaled to 0.3, there was relative much La2Ni7 phase in the alloy and the alloy exhibited better integrated electrochemical performance. Its maximum discharge capacity reached 355.4mAh/g and capacity retention after 50 cycles（S50）was 77.80%. The results showed the existence of La2Ni7 phase would be conductive to the integrated electrochemical performance of the alloy.

Facile synthesis of Fe2O3/MWCNT composites with improved cycling stability

RSC Advances ◽  
2015 ◽  
Vol 5 (2) ◽  
pp. 1447-1451 ◽  
Author(s):  
Yanhong Yin ◽  
Xiaoting Zhang ◽  
Yujie Jia ◽  
Zhaoxia Cao ◽  
Shuting Yang
Keyword(s):  
Discharge Capacity ◽  
Cycling Stability ◽  
Void Space ◽  
Facile Synthesis ◽  
Capacity Retention ◽  
A Current

Fe2O3 nanoparticles were fabricated via a facile method and loaded into the void space in the intertwined MWCNT matrix or on the MWCNTs homogeneously. The as-prepared Fe2O3/MWCNTs composites deliver a discharge capacity of 1026 mA h g−1 at a current rate of 0.2 C after 50 cycles, which has a 81.2% capacity retention.

On Improving the Cycling Stability of P2-Type Na0.67Ni0.33Mn0.67O2 Cathode Material By Ti-Substitution for Na-Ion Batteries

2019 ◽  
Author(s):  
Debanjana Pahari ◽  
Sreeraj Puravankara
Keyword(s):  
Solid State ◽  
Cathode Material ◽  
Discharge Capacity ◽  
Synthesis Method ◽  
Cycling Stability ◽  
Solid State Synthesis ◽  
Initial Discharge Capacity ◽  
Initial Discharge ◽  
Ti Substitution ◽  
Solid State Synthesis Method

A novel cathode material with Ti-substitution on Ni site, P2-type Na0.67Ni0.25Ti0.08Mn0.67O2 has been synthesized via solid-state synthesis method and characterized electrochemically. Na0.67Ni0.25Ti0.08Mn0.67O2 electrodes have been observed tobe highly reversible at higher voltage ranges. The electrodes have an initial discharge capacity of 125 mAhg-1and can retain around 84% of this capacity (105 mAhg-1) even after 50 cycles at 0.1C when cycled at an uppercut-off voltage of 4.3 V. Na0.67Ni0.25Ti0.08Mn0.67O2 electrodes are believed to suppress the irreversible P2-O2 transformation by diverting the charging reaction through a more reversible P2-OP4transition.

Ultrathin carbon-coated FeS2 nanooctahedra for sodium storage with long cycling stability

2019 ◽  
Vol 6 (2) ◽  
pp. 459-464 ◽  
Author(s):  
Shiwen Wang ◽  
Yaping Jing ◽  
Lifeng Han ◽  
Heng Wang ◽  
Shide Wu ◽  
...  
Keyword(s):  
Carbon Coating ◽  
Cycling Stability ◽  
Sodium Ion ◽  
Superior Performance ◽  
Ion Storage ◽  
Carbon Coated ◽  
Sodium Ion Storage ◽  
Sodium Storage

Porous ultrathin carbon-encapsulated FeS2@C nanooctahedra synthesized by a facile solvothermal and carbon-coating-annealing-pickling strategy exhibit a superior performance for sodium-ion storage.

Ultra-high performance of Li/Na ion batteries using N/O dual dopant porous hollow carbon nanocapsules as an anode

2019 ◽  
Vol 7 (18) ◽  
pp. 11117-11126 ◽  
Author(s):  
Linlin Wang ◽  
Bo Lu ◽  
Saisai Wang ◽  
Wei Cheng ◽  
Yufeng Zhao ◽  
...  
Keyword(s):  
Porous Carbon ◽  
High Performance ◽  
High Capacity ◽  
Cycling Stability ◽  
Carbon Nanocapsules ◽  
Hollow Carbon ◽  
Sodium Storage ◽  
Hollow Carbon Nanocapsules

N/O dual dopant porous carbon nanocapsules simultaneously attain ultrafast lithium and sodium storage with both a high capacity and an ultralong cycling stability.

Electrochemical Hydrogen Storage Characteristics of (Mg1-XZrX)2Ni (x = 0 - 0.3) Alloys Prepared by Mechanical Alloying

2011 ◽  
Vol 291-294 ◽  
pp. 29-33 ◽  
Author(s):  
Yang Huan Zhang ◽  
Zhong Hui Hou ◽  
Shi Hai Guo ◽  
Guo Fang Zhang ◽  
Xia Li ◽  
...  
Keyword(s):  
Hydrogen Storage ◽  
Mechanical Alloying ◽  
Discharge Capacity ◽  
Electrochemical Measurement ◽  
Discharge Voltage ◽  
Electrochemical Performances ◽  
Cycle Stability ◽  
Electrochemical Hydrogen Storage ◽  
Milling Duration ◽  
Storage Characteristics

The electrode alloys (Mg1-xZrx)2Ni (x = 0, 0.3) were prepared by mechanical alloying (MA). Mg in the alloy was partially substituted by Zr in order to improve the electrochemical hydrogen storage characteristics of the Mg2Ni-type alloy. The effects of substituting Mg with Zr as well as milling duration on the microstructures and electrochemical performances of the alloys were investigated in detail. The results showed that the substitution of Zr facilitates the formation of amorphous Mg2Ni-type phase. The electrochemical measurement indicated that the substitution of Zr significantly enhances the discharge capacity and cycle stability of the alloys, and it markedly improved the discharge potential characteristic of the alloys. For a fixed alloy, the electrochemical performances, including the cycle stability and the discharge voltage characteristic as well as discharge capacity, of the alloys were markedly improved with prolonging of the ball-milling duration.

Microstructures and Electrochemical Properties of La0.7Ce0.3Ni3.7Co0.7-xAl0.2Mn0.4(Fe0.43B0.57)x (x = 0-0.4) Hydrogen Storage Alloys

2012 ◽  
Vol 608-609 ◽  
pp. 917-920
Author(s):  
Yu Zhou ◽  
Yan Ping Fan ◽  
Xian Yun Peng ◽  
Bao Zhong Liu
Keyword(s):  
Hydrogen Storage ◽  
Electrochemical Properties ◽  
Discharge Capacity ◽  
Secondary Phase ◽  
Cycling Stability ◽  
High Rate ◽  
X Ray Diffraction ◽  
Hydrogen Storage Alloys ◽  
X Ray ◽  
The Matrix

X-ray diffraction results indicate that pristine alloy has a single LaNi5 phase and the alloys containing Fe0.43B0.57 consist of the matrix LaNi5 phase and the La3Ni13B2 secondary phase. The abundance of La3Ni13B2 phase increases with increasing x value. Maximum discharge capacity of the alloy electrodes monotonically decreases from 336.1 mAh/g (x = 0) to 281.2 mAh/g (x = 0.4). High-rate dischargeability of the alloy electrodes first increases with increasing x from 0 to 0.20, and then decreases when x increases to 0.4. Cycling stability decreases with increasing x from 0 to 0.4.

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