| Improving cycling performance and electrochemical properties of Ni-rich LiNi0.8Co0.1Mn0.1O2 cathode materials by co-modified strategy with V2O5 |
| کد مقاله : 1079-CNF |
| نویسندگان |
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علی کریمی1، مهران جوانبخت *2، فاطمه پورصالحی3 1دانشگاه صنعتی امیرکبیر تهران 2دانشگاه صنعتی امیرکبیر- دانشکده شیمی 3دانشگاه صنعتی امیرکبیر |
| چکیده مقاله |
| Simultaneously surface and bulk modification strategy was applied to improve the cycling stability and electrochemical properties of the layered Ni-rich LiNi0.8Co0.1Mn0.1O2 cathode materials. Co-modified cathode material was successfully synthesized by a simple solid state method with different amounts of V2O5 as a coating and doping agent (1, 2, 5 mol%). The morphologies, structures and chemical compositions of the samples were characterized by scanning electron microscope, X-ray diffraction and energy dispersive spectrometer. Electrochemical measurements proved that the 5 mol% V2O5 co-modified sample exhibited excellent rate capability and cycling stability with the first discharge capacity of 205.6 mAh/g at 0.1 C with 94% capacity retention after 50 cycles when cycled between 2.7 and 4.3 V at 25 ℃, while that the first discharge capacity is only 179.2 mAh/g at 0.1 C with capacity retention of 78% for bare LiNi0.8Co0.1Mn0.1O2. This improvement is attributed to the co-modified strategy of vanadium bulk doping and V2O5 surface coating, not only can removal of lithium impurities on the cathode material and prevent the cathode materials from direct contact with the electrolyte and decomposition or oxidation of electrolyte but also can suppress the irreversible phase transformation and play a role in structural stabilities and reduce the degree of cation mixing layer, which facilitate the lithium ion transport and enhance the electrochemical properties of the layered LiNi0.8Co0.1Mn0.1O2 cathode materials. |
| کلیدواژه ها |
| Ni-rich cathode material, Coating, Doping, Cycling stability, Solid state method |
| وضعیت: چکیده برای ارائه به صورت پوستر پذیرفته شده است |