화염분무열분해법을 이용한 구형의 고결정성 리튬 과잉 양극재 제조
Synthesis of Li-rich Cathode Material with Spherical Shape and High Crystallinity by Using Flame Spray Pyrolysis
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초록
A Li-rich cathode material, Li1.167Mn0.548Ni0.18Co0.105O , with a spherical shape and high crystallinity, is prepared using2flame spray pyrolysis. The post-heat treatment condition influences the properties of the prepared material, such as its structure,morphology, and chemical composition, and optimum performance is achieved at 900°C. Various excess Li contents (0-12 wt.%) areintroduced in the precursor solution to compensate for volatilized Li during synthesis, bringing it close to the target composition. Compensation for volatilized Li enhances the electrochemical performance, i.e., the Li-compensated sample shows a good dischargecapacity of 247 mAh g at a current density of 20 mA g-1-1 in a potential window of 4.6-2.5 V. In addition, the prepared Li-rich cathodematerial supplemented with 9 wt.% of the Li source shows increased discharge capacity of 175 and 148 mAh g-1 at 200 and 400mA g , respectively, compared with those of a bare sample (164 and 127 mAh g-1-1 , respectively).
Abstract
A Li-rich cathode material, Li1.167Mn0.548Ni0.18Co0.105O , with a spherical shape and high crystallinity, is prepared using2flame spray pyrolysis. The post-heat treatment condition influences the properties of the prepared material, such as its structure,morphology, and chemical composition, and optimum performance is achieved at 900°C. Various excess Li contents (0-12 wt.%) areintroduced in the precursor solution to compensate for volatilized Li during synthesis, bringing it close to the target composition. Compensation for volatilized Li enhances the electrochemical performance, i.e., the Li-compensated sample shows a good dischargecapacity of 247 mAh g at a current density of 20 mA g-1-1 in a potential window of 4.6-2.5 V. In addition, the prepared Li-rich cathodematerial supplemented with 9 wt.% of the Li source shows increased discharge capacity of 175 and 148 mAh g-1 at 200 and 400mA g , respectively, compared with those of a bare sample (164 and 127 mAh g-1-1 , respectively).
참고문헌 (18)
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