Stabilizing the high-voltage cycle performance of LiNi0.8Co0.1Mn0.1O2 cathode material by Mg doping

2019 ◽  
Vol 438 ◽  
pp. 227017 ◽  
Author(s):  
Xiaolan Liu ◽  
Shuo Wang ◽  
Li Wang ◽  
Ke Wang ◽  
Xiaozhong Wu ◽  
...  
2020 ◽  
Vol 310 ◽  
pp. 58-64
Author(s):  
Dan Wu ◽  
Wei Li ◽  
O. Tegus ◽  
Si Qin Bater

Solid electrolyte Li1.4Al0.4Ti1.6 (PO4)3 was used to coat high voltage (5V) spinel lithium manganate. The modified high voltage spinel lithium manganate was used as positive electrode and the lithium titanate as negative electrode. A type of 10Ah energy storage battery was assembled. Charge-discharge and cycle life tests of these batteries were carried out at different temperatures and rates. The results show that coating high voltage spinel lithium manganate improves the high temperature cycle performance of the lithium titanate batteries. The capacity retention ratio of the lithium titanate batteries with the coated high voltage lithium manganate as cathode material increases from 74.8% to 86.5% at 60°Cafter 2000 cycles compared to the lithium titanate batteries with the uncoated high voltage lithium manganite as cathode material. However, the cycle performance is not affected at-30 °C. The low temperature rate performance of lithium titanate batteries is improved by coating high voltage lithium manganate. When the discharge rate is 20 C at-30°C, 90.6% of the 1 C charge capacity at room temperature of the lithium titanate battery with the coated high voltage lithium manganate as cathode materialcan be delivered, while the lithium titanate battery with the un-coated high voltage lithium manganate as cathode material can only deliver 80.2% of the 1 C charge capacity at room temperature.


RSC Advances ◽  
2020 ◽  
Vol 10 (58) ◽  
pp. 35206-35213
Author(s):  
Abdelaziz M. Aboraia ◽  
Viktor V. Shapovalov ◽  
Alexnader A. Guda ◽  
Vera V. Butova ◽  
Alexander Soldatov

LiCoPO4 (LCP) is a promising high voltage cathode material but suffers from low conductivity and poor electrochemical properties.


Author(s):  
Xiaoyu Zhang ◽  
Yuegang Qiu ◽  
Fangyuan Cheng ◽  
Peng Wei ◽  
Yuyu Li ◽  
...  

Author(s):  
Kuan-Ching Wu ◽  
Chieh-Ming Hsieh ◽  
Bor Kae Chang

The olivine phosphate LiCoPO4 is a prospective cathode material in high voltage lithium ion batteries. During lithium diffusion, the ions must overcome diffusion energy barrier near the surface and in...


2021 ◽  
Vol 130 (1B) ◽  
pp. 59-67
Author(s):  
Thien Lan Tran ◽  
Huu Duc Luong ◽  
Trong Lam Pham ◽  
Viet Bac Phung ◽  
Van An Dinh

Based on the density functional theory, we propose a promising cathode material, Na2Fe3(SO4)4, applicable for sodium-ion batteries. The crystal structure, stability, average voltage, and diffusion mechanism are carefully investigated to evaluate the electrochemical properties. The proposed material exhibits a high voltage of 4.0 V during the Na extraction. A small polaron is proved to be formed preferably at the first nearest Fe sites to Na vacancy and simultaneously accompanies the Na vacancy during its migration. Four elementary diffusion processes of the polaron–Na vacancy complexes, namely two parallel and two crossing processes, have been explored. The significant difference of activation energies between parallel and crossing processes suggests the substantial effect of the small polaron migration on the Na vacancy diffusion. We found that the parallel process along the [001] direction has the lowest activation energy of 808 meV, implying that the Na vacancy preferably diffuses in a zigzag pathway along the [001] direction.


Ionics ◽  
2018 ◽  
Vol 25 (5) ◽  
pp. 2007-2016 ◽  
Author(s):  
Gang Sun ◽  
Chenxiao Jia ◽  
Jianning Zhang ◽  
Wu Yang ◽  
Zhipeng Ma ◽  
...  

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