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NASICON-type Li0.5M0.5Ti1.5Fe0.5(PO4)3 (M = Mn, Co, Mg) phosphates as electrode materials for lithium-ion batteries
Electrochimica Acta ( IF 5.5 ) Pub Date : 2021-10-18 , DOI: 10.1016/j.electacta.2021.139438
Kenza ELBOUAZZAOUI 1, 2 , Mohammed SROUT 1, 3 , Ismael SAADOUNE 1, 4 , Lahcen BIH 5 , Hicham BEN YOUCEF 6 , Mouad DAHBI 7 , Mohammed MANSORI 1
Affiliation  

A correlation between the crystal structure, the ionic conductivity and the electrochemical performance in Lithium-ion batteries was established for a series of NASICON-type phosphates Li0.5M0.5Ti1.5Fe0.5(PO4)3 (M = Mn, Co, Mg). These electrode materials, where the M1 site contains both lithium and the divalent cation M, were prepared using a simple sol-gel process while controlling the pH and the final synthesis temperature. The three phosphates crystallize in the rhombohedral system (S.G. R-3c) with comparable unit cell parameters but with slight difference in the local distortion of the PO4 tetrahedra as confirmed by the Raman study. The ionic conductivities of the Li0.5M0.5Ti1.5Fe0.5(PO4)3 materials were measured at different temperatures using a wide range of frequencies. Mn-based phosphate shows the best features for application as electrode material for Li-ion batteries in term of the conductivity at room temperature and the activation energy of Li+ conduction process. The initial discharge capacity of 100 mAh.g  1 was obtained for the Mg-based phosphate, 104.3 mAh.g  1 for the Co-based material while the Mn-based material delivers the best first discharge capacity of 125.3 mAh.g  1 with the lowest polarization in relation with its better conduction properties. This result was also confirmed by the rate capability tests where Mn-based phosphate shows enhanced electrochemical performance even at fast rate of 5C.



中文翻译:

NASICON 型 Li0.5M0.5Ti1.5Fe0.5(PO4)3 (M = Mn, Co, Mg) 磷酸盐作为锂离子电池的电极材料

建立了一系列 NASICON 型磷酸盐 Li 0.5 M 0.5 Ti 1.5 Fe 0.5 (PO 4 ) 3 ( M  = Mn, Co, Mg )。这些电极材料,其中 M1 位点包含锂和二价阳离子 M,使用简单的溶胶-凝胶工艺制备,同时控制 pH 值和最终合成温度。三种磷酸盐在菱面体系统 (SG R-3c ) 中结晶,晶胞参数相当,但 PO 4的局部变形略有不同拉曼研究证实了四面体。Li 0.5 M 0.5 Ti 1.5 Fe 0.5 (PO 4 ) 3材料的离子电导率在不同温度下使用宽范围的频率进行测量。就室温下的电导率和 Li +传导过程的活化能而言,锰基磷酸盐显示出作为锂离子电池电极材料的最佳应用特性。初始放电容量为100 mAh。镁基磷酸盐的g  -  1为 104.3 mAh。 -  1对于 Co 基材料,而 Mn 基材料提供了 125.3 mAh 的最佳首次放电容量。g  -  1具有与其更好的传导特性相关的最低极化。倍率性能测试也证实了这一结果,其中锰基磷酸盐即使在 5C 的快速倍率下也显示出增强的电化学性能。

更新日期:2021-10-26
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