Controllable preparation of ultra-high rate LiNi1/3Co1/3mn1/3o2cathode through carbonate co-precipitation method for li-ion batteries
RIS ID
117703
Abstract
The ultra-high rate nanostructured LiNi 1/3 Co 1/3 Mn 1/3 O 2 cathode is controllably prepared by the carbonate co-precipitation method through tailoring the amount of the NH 3 ·H 2 O.The NH 3 ·H 2 O has a great effect on morphology, particle size, crystal structure and electrochemical performance.Powder X-ray diffraction (XRD) and scanning electron microscopy (SEM) results indicate that the morphology of primary particle is changed from nano-plate to nano-sphere with the decreasing of the NH 3 ·H 2 O, and the sample with ratio n NH3·H2O :(n Ni +n Co +n Mn )=1:2 has the well-ordered-NaFeO 2 structure and the lowest cation mixing (Li + /Ni 2+ ).Electrochemical results also confirm that the sample with ratio n NH3·H2O :(n Ni +n Co +n Mn )=1:2 has the best cycling stability and ultra-high rate capability.Specifically, it delivers a discharge capacity of 119 mAh·g -1 between 2.7 and 4.3 V at 1C after 300 cycles with outstanding capacity retention of 81%, and the mid-point potential retention is 97%.This sample can still deliver a high discharge capacity of 56 mAh·g -1 even at the ultra-high rate 100C (18 mAh·g -1 ), which has the prospect to be applied in high power lithium ion battery.This nğ ratio could provide some valuable reference for synthesizing other high-rate and high-capacity anode/cathode oxides.
Publication Details
Zheng, Z., Hua, W., Wu, Z., Xiang, W., Zhong, B. & Guo, X. (2017). Controllable preparation of ultra-high rate LiNi1/3Co1/3mn1/3o2cathode through carbonate co-precipitation method for li-ion batteries. Chinese Journal of Inorganic Chemistry (English), 33 (2), 1-8.