Abstract
Boron-doped Ni-rich LiNi0.84Co0.10Mn0.06O2 (B-NCM) cathode material is prepared and its electrochemical performances are investigated. The structural properties indicate that the incorporation of boron leads to highly-ordered layered structure and low cation disordering. All samples have high areal loadings of active materials (approximately 14.6 mg/cm2) that meets the requirement for commercialization. Among them, the 1.0 wt% boron-doped NCM (1.0B-NCM) shows the best electrochemical performances. The 1.0B-NCM delivers a discharge capacity of 205. 3 mAh g−1, cyclability of 93.1% after 50 cycles at 0.5 C and rate capability of 87.5% at 2 C. As a result, we can conclude that the 1.0B-NCM cathode can be regarded as a promising candidate for the next-generation lithium ion batteries.
Highlights
Lithium-ion batteries (LIBs) are most commonly used in electric vehicles (EVs) and hybrid electric vehicles (HEVs) and portable devices due to superior energy density they have suffered from inferior cycle life and rate capability
The results indicate that appropriate boron content can significantly enhance the electrochemical performances
The smallest in full-width at half maximum (FWHM) value of 1.0B-doped NCM indicates that it has the highest crystallinity compared to others, as shown in Fig. (b)[16]
Summary
Lithium-ion batteries (LIBs) are most commonly used in electric vehicles (EVs) and hybrid electric vehicles (HEVs) and portable devices due to superior energy density they have suffered from inferior cycle life and rate capability. Many approaches, such as coatings[7], substitution[7,8], electrolyte additives and single crystal[9,10], have been designed to improve the electrochemical performance of Ni-rich NCM cathode. The excellent electrochemical performances of lithium-rich manganese-based oxide could be obtained based on structure stability, resulting from polyanion doping of (BO3)3− and (BO4)[5− 11,12].
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