AI Article Synopsis
- Lithium-rich layered oxide materials, such as xLi2MnO3·(1 - x)LiMO2, show great potential as cathode materials in electric vehicle batteries due to their high energy density of approximately 900 W h kg-1.
- The research investigates how different cycling rates impact the structural stability and electrochemical properties of a 0.5Li2MnO3·0.5LiCoO2 composite, highlighting that higher cycling rates slow down the activation of Li2MnO3.
- Findings indicate that a slower activation of Li2MnO3 results in less phase transition to spinel form and enhances overall cycling stability, which is crucial for efficient battery performance.
Article Abstract
Lithium-rich layered oxide materials, xLi2MnO3·(1 - x)LiMO2 (M = Mn, Fe, Co, Ni, etc.), are a promising candidate for use as cathode materials in the batteries of electric vehicles (EVs). This is due to their high energy density (∼900 W h kg-1), which is larger than those of the currently used commercial cathode materials. Moreover, EV technologies require lithium ion batteries with a high rate performance to achieve short charging times. The high rate property largely depends on the electrochemical properties of the electrodes in these batteries. However, the correlation between the cycling rate, structural stability and electrochemical properties of cathode materials is not clearly understood. In this work, the influence of cycling rate on structural transition behaviors and cycling stability of a 0.5Li2MnO3·0.5LiCoO2 composite-based material was investigated. The experimental results reveal that cycling rates significantly affect the activation of the Li2MnO3 component. A high cycling rate retards Li2MnO3 activation, leading to a smaller spinel phase transition and a higher cycling stability.
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| http://dx.doi.org/10.1039/c9cp04283k | DOI Listing |
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