Overlithiation of LiNi0.8Co0.2O2 for Increased Performance in Li-Ion Batteries

2014 ◽  
Vol 938 ◽  
pp. 253-256
Author(s):  
Hashlina Rusdi ◽  
Norlida Kamarulzaman ◽  
Rusdi Roshidah ◽  
Kelimah Elong ◽  
Abd Rahman Azilah
Keyword(s):  
Cathode Materials ◽  
Structural Instability ◽  
Cation Ordering ◽  
Capacity Fading ◽  
Capacity Retention ◽  
Battery Capacity ◽  
Li Ion ◽  
Battery Application ◽  
Charge Discharge ◽  
Better Than

Layered LiNi1-xCoxO2 is one of the promising cathode materials for Li-ion battery application. However, the Ni rich cathode materials exhibit low capacity and bad capacity retention. This is due to factors such as disorder and structural instability when Li is removed during charge-discharge. Overlithiation of cathode materials is expected to improve the cation ordering and structural stability. Good cation ordering will increase the battery capacity. During charge-discharge, the irreversible Li+ loss can be replaced to a certain extent by the interstitial Li+ ions in the lattice of the LixNi0.8Co0.2O2 material. This helps reduce capacity fading of the cathode materials. In this work the overlithiation of LiNi0.8Co0.2O2 is done by interstitially doping Li+ in the LiNi0.8Co0.2O2 materials producing Li1.05Ni0.8Co0.2O2 and Li1.1Ni0.8Co0.2O2. Results showthat the performance of the overlithiated LiNi0.8Co0.2O2 materials is better than pure LiNi0.8Co0.2O2.

Combined Ag and Cu-doping of MnO improves Li-ion battery capacity retention on cycling

2021 ◽  
pp. 130659
Author(s):  
Liang He ◽  
Jimmy Wu ◽  
Derwin Lau ◽  
Charles Hall ◽  
Yu Jiang ◽  
...  
Keyword(s):  
Li Ion Battery ◽  
Capacity Retention ◽  
Cu Doping ◽  
Battery Capacity ◽  
Li Ion

scholarly journals Solid Solutions of LiCo1−xNixO2 (x=0,0.1,…,0.9) Obtained via a Combustion Synthesis Route and Their Electrochemical Characteristics

2013 ◽  
Vol 2013 ◽  
pp. 1-8 ◽  
Author(s):  
Kelimah Elong ◽  
Norlida Kamarulzaman ◽  
Roshidah Rusdi ◽  
Nurhanna Badar ◽  
Mohd Hilmi Jaafar
Keyword(s):  
Solid Solutions ◽  
Single Phase ◽  
Cation Ordering ◽  
Electrochemical Characteristics ◽  
Hexagonal Crystal ◽  
Voltage Range ◽  
Voltage Plateau ◽  
Combustion Route ◽  
Charge Discharge ◽  
Better Than

Pure, single-phase and layered LiCo1−xNixO2 materials with good cation ordering are not easy to synthesize. In this work, solid solutions of LiCo1−xNixO2 (x = 0, 0.1, …, 0.9) are synthesized using a self-propagating combustion route and characterized. All the materials are observed to be phase pure giving materials of hexagonal crystal system with R-3m space group. The RIR and R factor values of stoichiometries of LiCo1−xNixO2 (x = 0.1, 0.2, 0.3, 0.4, and 0.5) show good cation ordering. Their electrochemical properties are investigated by a series of charge-discharge cycling in the voltage range of 3.0 to 4.3 V. It is found that some of the stoichiometries exhibit specific capacities comparable or better than those of LiCoO2, but the voltage plateau is slightly more slopping than that for the LiCoO2 reference material.

scholarly journals Fe–Si networks and charge/discharge-induced phase transitions in Li2FeSiO4 cathode materials

2018 ◽  
Vol 20 (21) ◽  
pp. 14557-14563 ◽  
Author(s):  
Xiaobao Lv ◽  
Xin Zhao ◽  
Shunqing Wu ◽  
Manh Cuong Nguyen ◽  
Zizhong Zhu ◽  
...  
Keyword(s):  
Phase Transitions ◽  
Cathode Materials ◽  
Electrode Materials ◽  
Structural Phase ◽  
Li Ion Batteries ◽  
Structural Phase Transitions ◽  
Li Ion ◽  
Charge Discharge

Structural phase transitions of electrode materials are responsible for poor reversibility during charge/discharge cycling in Li-ion batteries.

scholarly journals Boron-doped sodium layered oxide for reversible oxygen redox reaction in Na-ion battery cathodes

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Yu-Jie Guo ◽  
Peng-Fei Wang ◽  
Yu-Bin Niu ◽  
Xu-Dong Zhang ◽  
Qinghao Li ◽  
...  
Keyword(s):  
Cathode Material ◽  
High Voltage ◽  
Cathode Materials ◽  
Redox Reaction ◽  
Structural Changes ◽  
Active Material ◽  
Charge Compensation ◽  
High Energy ◽  
Structural Instability ◽  
Capacity Retention

AbstractNa-ion cathode materials operating at high voltage with a stable cycling behavior are needed to develop future high-energy Na-ion cells. However, the irreversible oxygen redox reaction at the high-voltage region in sodium layered cathode materials generates structural instability and poor capacity retention upon cycling. Here, we report a doping strategy by incorporating light-weight boron into the cathode active material lattice to decrease the irreversible oxygen oxidation at high voltages (i.e., >4.0 V vs. Na+/Na). The presence of covalent B–O bonds and the negative charges of the oxygen atoms ensures a robust ligand framework for the NaLi1/9Ni2/9Fe2/9Mn4/9O2 cathode material while mitigating the excessive oxidation of oxygen for charge compensation and avoiding irreversible structural changes during cell operation. The B-doped cathode material promotes reversible transition metal redox reaction enabling a room-temperature capacity of 160.5 mAh g−1 at 25 mA g−1 and capacity retention of 82.8% after 200 cycles at 250 mA g−1. A 71.28 mAh single-coated lab-scale Na-ion pouch cell comprising a pre-sodiated hard carbon-based anode and B-doped cathode material is also reported as proof of concept.

Effects of Li-doped NiO on the charge–discharge properties of LiF–NiO composites used as cathode materials for Li-ion batteries

2017 ◽  
Vol 47 (9) ◽  
pp. 1057-1063 ◽  
Author(s):  
Yasumasa Tomita ◽  
Noritaka Kimura ◽  
Hiromasa Nasu ◽  
Yusuke Izumi ◽  
Juichi Arai ◽  
...  
Keyword(s):  
Cathode Materials ◽  
Li Ion Batteries ◽  
Li Ion ◽  
Charge Discharge

Li-rich layer-structured cathode materials for high energy Li-ion batteries

2014 ◽  
Vol 07 (04) ◽  
pp. 1430002 ◽  
Author(s):  
Liu Li ◽  
Kim Seng Lee ◽  
Li Lu
Keyword(s):  
Cathode Materials ◽  
High Capacity ◽  
Rate Capability ◽  
Reversible Capacity ◽  
High Energy ◽  
Li Ion Batteries ◽  
Practical Applications ◽  
Depth Study ◽  
Li Ion ◽  
Charge Discharge

Li -rich layer-structured x Li 2 MnO 3 ⋅ (1 - x) LiMO 2 ( M = Mn , Ni , Co , etc.) materials have attracted much attention due to their extraordinarily high reversible capacity as the cathode material in Li -ion batteries. To better understand the nature of this type of materials, this paper reviews history of development of the Li -rich cathode materials, and provides in-depth study on complicated crystal structures and reaction mechanisms during electrochemical charge/discharge cycling. Despite the fabulous capability at low rate, several drawbacks still gap this type of high-capacity cathode materials from practical applications, for instance the large irreversible capacity loss at first cycle, poor rate capability, severe voltage decay and capacity fade during electrochemical charge/discharge cycling. This review will also address mechanisms for these inferior properties and propose various possible solutions to solve above issues for future utilization of these cathode materials in commercial Li -ion batteries.

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