A novel co-precipitation method for one-pot fabrication of a Co–Ni multiphase composite electrode and its application in high energy-density pseudocapacitors

2013 ◽  
Vol 49 (63) ◽  
pp. 7067 ◽  
Author(s):  
Joah Han ◽  
Kwang Chul Roh ◽  
Mi Ru Jo ◽  
Yong-Mook Kang
Keyword(s):  
Energy Density ◽  
Composite Electrode ◽  
High Energy ◽  
High Energy Density ◽  
Precipitation Method ◽  
One Pot ◽  
Co Precipitation ◽  
Multiphase Composite

Core–Shell Structured NiCo2O4@ZnCo2O4 Nanomaterials with High Energy Density for Hybrid Capacitors

2021 ◽  
Vol 16 (7) ◽  
pp. 1134-1142
Author(s):  
Wenduo Yang ◽  
Jun Xiang ◽  
Sroeurb Loy ◽  
Nan Bu ◽  
Duo Cui ◽  
...  
Keyword(s):  
Energy Density ◽  
Electrode Material ◽  
Composite Electrode ◽  
Electrode Materials ◽  
Structural Characteristics ◽  
High Energy ◽  
High Energy Density ◽  
Core Shell ◽  
Shell Composite ◽  
Hybrid Capacitors

NiCo2O4 as an electrode material for supercapacitors (SCs) has been studied by a host of researchers due to its unique structural characteristics and high capacitance. However, its performance has not yet reached the level of practical applications.it is an effective strategy to synthesize composite electrode materials for tackling the problem. Herein, NiCo2O4@ZnCo2O4 as a novel core–shell composite electrode material has been fabricated through a two-step simple hydrothermal method. The as-prepared sample can be directly used as cathode material of a supercapacitor, and its specific capacitance is 463.1 C/g at 1 A/g. An assembled capacitor has an energy density of 77 Wh·kg−1 at 2700 W·kg−1, and after 8000 cycles, 88% of the initial capacity remains.

One-pot pyro-synthesis of a high energy density LiFePO 4 -Li 3 V 2 (PO 4 ) 3 nanocomposite cathode for lithium-ion battery applications

2017 ◽  
Vol 43 (5) ◽  
pp. 4288-4294 ◽  
Author(s):  
Jeonggeun Jo ◽  
Jihyeon Gim ◽  
Jinju Song ◽  
Yeoun Kim ◽  
Vinod Mathew ◽  
...  
Keyword(s):  
Energy Density ◽  
Lithium Ion Battery ◽  
Lithium Ion ◽  
High Energy ◽  
High Energy Density ◽  
One Pot

scholarly journals High-Performance Lithium-Rich Layered Oxide Material: Effects of Preparation Methods on Microstructure and Electrochemical Properties

Materials ◽  
2020 ◽  
Vol 13 (2) ◽  
pp. 334 ◽  
Author(s):  
Qiming Liu ◽  
Huali Zhu ◽  
Jun Liu ◽  
Xiongwei Liao ◽  
Zhuolin Tang ◽  
...  
Keyword(s):  
Energy Density ◽  
Lithium Ion Batteries ◽  
Layered Structure ◽  
Specific Capacity ◽  
Lithium Ion ◽  
High Energy ◽  
High Energy Density ◽  
Voltage Decay ◽  
Rate Capacity ◽  
Co Precipitation

Lithium-rich layered oxide is one of the most promising candidates for the next-generation cathode materials of high-energy-density lithium ion batteries because of its high discharge capacity. However, it has the disadvantages of uneven composition, voltage decay, and poor rate capacity, which are closely related to the preparation method. Here, 0.5Li2MnO3·0.5LiMn0.8Ni0.1Co0.1O2 was successfully prepared by sol–gel and oxalate co-precipitation methods. A systematic analysis of the materials shows that the 0.5Li2MnO3·0.5LiMn0.8Ni0.1Co0.1O2 prepared by the oxalic acid co-precipitation method had the most stable layered structure and the best electrochemical performance. The initial discharge specific capacity was 261.6 mAh·g−1 at 0.05 C, and the discharge specific capacity was 138 mAh·g−1 at 5 C. The voltage decay was only 210 mV, and the capacity retention was 94.2% after 100 cycles at 1 C. The suppression of voltage decay can be attributed to the high nickel content and uniform element distribution. In addition, tightly packed porous spheres help to reduce lithium ion diffusion energy and improve the stability of the layered structure, thereby improving cycle stability and rate capacity. This conclusion provides a reference for designing high-energy-density lithium-ion batteries.

scholarly journals Preparation of spherical LiNi0.5Mn1.5O4 with core-multilayer shells structure by co-precipitation method and long cycle performance

2020 ◽  
Vol 213 ◽  
pp. 01011
Author(s):  
Guo-Jiang Zhou ◽  
Tao Yu ◽  
Yang Zhou ◽  
Li-Guo Wei
Keyword(s):  
Specific Capacity ◽  
Lithium Ion ◽  
High Energy ◽  
Solid Particles ◽  
High Energy Density ◽  
Cycle Performance ◽  
Precipitation Method ◽  
Xps Spectra ◽  
Long Cycle ◽  
Co Precipitation

As a promising cathode material for lithium ion battemensionalry of high voltage, spinel LiNi0.5Mn1.5O4 has attracted interest due to its high discharging voltage at 4.7 V and high energy density of 610 Wh kg-1. In this work, LiNi0.5Mn1.5O4 with a new core-multilayer shells structure (LNMO-900) is synthesized successfully by co-precipitation method and shows a better electrochemical performance. The formation of the core-multilayer shells structure is related to the kirkendall effect, the shell maintains structural stability, and improves long cycle performance. Core-multilayer shells structure is also beneficial for transmission of lithium ion, increasing rate performance. The effects of sintering temperature on the performance of LNMO were further investigated. Core-multilayer shells LiNi0.5Mn1.5O4 is synthesized successfully at 900 °C for 12 h uniquely. From the integral calculation of XPS spectra, a higher content of Mn4+ is observed in the outer shell of LNMO-900 compared with other homogeneous solid particles. The discharge specific capacity of LNMO-900 is 129.3 mAh g-1 at 1 C which is superior to others, and after 1000 cycles, LNMO-900 shows capacity retention of 87.9%. The initial capacity of LNMO-900 is 104.9 mAh g-1 at 5 C.

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