A facile in-situ coating strategy for Ni-rich cathode materials with improved electrochemical performance

2021 ◽  
pp. 138297
Author(s):  
Xiang Zhang ◽  
Guorong Hu ◽  
Yanbing Cao ◽  
Zhongdong Peng ◽  
Weigang Wang ◽  
...  
Keyword(s):  
Electrochemical Performance ◽  
Cathode Materials ◽  
In Situ Coating

scholarly journals Rapid mechanochemical synthesis of polyanionic cathode with improved electrochemical performance for Na-ion batteries

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Xing Shen ◽  
Quan Zhou ◽  
Miao Han ◽  
Xingguo Qi ◽  
Bo Li ◽  
...  
Keyword(s):  
Energy Storage ◽  
Electrochemical Performance ◽  
Mechanochemical Synthesis ◽  
Cathode Materials ◽  
Industrial Application ◽  
Synthesis Process ◽  
In Situ Fabrication ◽  
Stationary Energy ◽  
Carbon Coated

AbstractNa-ion batteries have been considered promising candidates for stationary energy storage. However, their wide application is hindered by issues such as high cost and insufficient electrochemical performance, particularly for cathode materials. Here, we report a solvent-free mechanochemical protocol for the in-situ fabrication of sodium vanadium fluorophosphates. Benefiting from the nano-crystallization features and extra Na-storage sites achieved in the synthesis process, the as-prepared carbon-coated Na3(VOPO4)2F nanocomposite exhibits capacity of 142 mAh g−1 at 0.1C, higher than its theoretical capacity (130 mAh g−1). Moreover, a scaled synthesis with 2 kg of product was conducted and 26650-prototype cells were demonstrated to proof the electrochemical performance. We expect our findings to mark an important step in the industrial application of sodium vanadium fluorophosphates for Na-ion batteries.

Improving the electrochemical properties of LiNi0.5Co0.2Mn0.3O2 at 4.6 V cutoff potential by surface coating with Li2TiO3 for lithium-ion batteries

2015 ◽  
Vol 17 (47) ◽  
pp. 32033-32043 ◽  
Author(s):  
Jing Wang ◽  
Yangyang Yu ◽  
Bing Li ◽  
Tao Fu ◽  
Dongquan Xie ◽  
...  
Keyword(s):  
Electrochemical Performance ◽  
Electrochemical Properties ◽  
Lithium Ion Batteries ◽  
Cathode Materials ◽  
Surface Coating ◽  
Lithium Ion ◽  
Coprecipitation Method

The Li2TiO3-coated LiNi0.5Co0.2Mn0.3O2 (LTO@NCM) cathode materials are synthesized via an in situ coprecipitation method to improve the electrochemical performance of NCM.

scholarly journals Effects of the LiFePO4 content and the preparation method on the properties of (LiFePO4+AC)/Li4Ti5O12 hybrid batterycapacitors

2010 ◽  
Vol 75 (9) ◽  
pp. 1259-1269 ◽  
Author(s):  
Xue Hu ◽  
Zi Lin ◽  
Li Liu ◽  
Jian Huai ◽  
Hua Deng
Keyword(s):  
Electrochemical Performance ◽  
Cathode Materials ◽  
Preparation Method ◽  
Composite Cathode ◽  
Cycle Performance ◽  
Cyclic Voltammograms ◽  
Capacity Loss ◽  
In Situ Method ◽  
Composite Cathodes

Two composite cathode materials containing LiFePO4 and activated carbon (AC) were synthesized by an in-situ method and a direct mixing technique, which are abbreviated as LAC and DMLAC, respectively. Hybrid battery-capacitors LAC/Li4Ti5O12 and DMLAC/Li4Ti5O12 were then assembled. The effects of the content of LiFePO4 and the preparation method on the cyclic voltammograms, the rate of charge-discharge and the cycle performance of the hybrid batterycapacitors were investigated. The results showed the overall electrochemical performance of the hybrid battery-capacitors was the best when the content of LiFePO4 in the composite cathode materials was in the range from 11.8 to 28.5 wt. %, while the preparation method had almost no impact on the electrochemical performance of the composite cathodes and hybrid battery-capacitors. Moreover, the hybrid batterycapacitor devices had a good cycle life performance at high rates. After 1000 cycles, the capacity loss of the DMLAC/Li4Ti5O12 hybrid batterycapacitor device at 4 C was no more than 4.8 %. Moreover, the capacity loss would be no more than 9.6 % after 2000 cycles at 8?C.

scholarly journals Enhanced Structural Stability and Electrochemical Performance of LiNi0.6Co0.2Mn0.2O2 Cathode Materials by Ga Doping

Materials ◽  
2021 ◽  
Vol 14 (8) ◽  
pp. 1816
Author(s):  
Zhibei Liu ◽  
Jiangang Li ◽  
Meijie Zhu ◽  
Li Wang ◽  
Yuqiong Kang ◽  
...  
Keyword(s):  
Electrochemical Performance ◽  
Structural Stability ◽  
Cathode Materials ◽  
Xrd Analysis ◽  
Structural Instability ◽  
In Situ Xrd ◽  
Li Ion ◽  
The Stability ◽  
Ga Doping

Structural instability during cycling is an important factor affecting the electrochemical performance of nickel-rich ternary cathode materials for Li-ion batteries. In this work, enhanced structural stability and electrochemical performance of LiNi0.6Co0.2Mn0.2O2 cathode materials are achieved by Ga doping. Compared with the pristine electrode, Li[Ni0.6Co0.2Mn0.2]0.98Ga0.02O2 electrode exhibits remarkably improved electrochemical performance and thermal safety. At 0.5C rate, the discharge capacity increases from 169.3 mAh g−1 to 177 mAh g−1, and the capacity retention also rises from 82.8% to 89.8% after 50 cycles. In the charged state of 4.3 V, its exothermic temperature increases from 245.13 °C to more than 271.24 °C, and the total exothermic heat decreases from 561.7 to 225.6 J·g−1. Both AC impedance spectroscopy and in situ XRD analysis confirmed that Ga doping can improve the stability of the electrode/electrolyte interface structure and bulk structure during cycling, which helps to improve the electrochemical performance of LiNi0.6Co0.2Mn0.2O2 cathode material.

Sign in / Sign up

Export Citation Format

Share Document