Structural evolution of nickel-rich layered cathode material LiNi 0.8 Co 0.1 Mn 0.1 O 2 at different current rates
- PDF / 1,993,907 Bytes
- 10 Pages / 595.276 x 790.866 pts Page_size
- 43 Downloads / 188 Views
ORIGINAL PAPER
Structural evolution of nickel-rich layered cathode material LiNi0.8Co0.1Mn0.1O2 at different current rates Yaohua Feng 1,2 & Hui Xu 1 & Bo Wang 1,2 & Kuanyou Tuo 1,2 & Peng Wang 1 & Shimin Wang 1 & Wenbiao Liang 1 & Hongli Lu 1 & Shiyou Li 1,2,3 Received: 30 July 2020 / Revised: 7 November 2020 / Accepted: 17 November 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Ni-rich layered oxide LiNi0.8Co0.1Mn0.1O2 has received considerable attention in the research field. However, the structural transformation of Ni-rich material is different at different cycling rates, and investigating the evolution of its structures to further enhance the electrochemical properties of the material seems of great significance. Therefore, the structural evolution of LiNi0.8Co0.1Mn0.1O2 materials is analyzed at different cycling rates. Results display that LiNi0.8Co0.1Mn0.1O2 materials will produce diverse phases at different cycling rates. At low cycling rates, there are enough Li vacancies in the materials to facilitate the complete mixing of transition metals and Li+, which leads the LiNi0.8Co0.1Mn0.1O2 materials to evolve from a layered structure to a rock salt phase structure. At high rates, the lack of vacancies caused by the sluggish dynamics will lead to the evolution of Ni-rich materials from a layered structure to a spinel structure. The electrochemical performances further show that about 78.23% of the capacity is maintained after 300 cycles at low rate of 1 C, which is much higher than that of 65.76% at high rate of 2 C. The results show that, compared to high-rate charge and discharge, the excellent electrochemical performance of lowrate charge and discharge is because it is easier to form a stable rock salt phase layer on the surface of the material at low rates, which effectively maintains the integrity of particles and better maintain the lithium-ion transmission rate of LiNi0.8Co0.1Mn0.1O2. Keywords LiNi0.8Co0.1Mn0.1O2 . Structural evolution . Spinel structure . Rock salt phase structure . Layered structure
Introduction With the increase of carbon dioxide emissions and the deterioration of the environment, lithium-ion batteries (LIBs), a kind of clean energy, have been used extensively in mobile electronics, electric vehicles (EV), hybrid electric vehicles, and energy storage systems with largescale [1, 2]. However, for achieving large-scale
* Shiyou Li [email protected] 1
College of Petrochemical Technology, Lanzhou University of Technology, 36 Pengjiaping Road, Lanzhou 730050, Gansu Province, People’s Republic of China
2
Gansu Engineering Laboratory of Cathode Material for Lithium-Ion Battery, Lanzhou 730050, People’s Republic of China
3
Qinghai Research Center of Low-Temperature Lithium-Ion Battery Technology Engineering, Qinghai Green Grass New Energy Technology Co. Ltd., Xining 810000, People’s Republic of China
commercialization of LIBs in the field of transportation, it is necessary to overcome the challenges of lower cost, higher energy density, and longer cycli
Data Loading...
