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首页> 外文期刊>Journal of power sources >Electrochemical properties of doped lithium titanate compounds and their performance in lithium rechargeable batteries
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Electrochemical properties of doped lithium titanate compounds and their performance in lithium rechargeable batteries

机译：掺杂钛酸锂化合物的电化学性质及其在可充电锂电池中的性能

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Several substituted titanates of formula Li_(4-x)Mg_xTi_(5-x)V_xO_(12) (0 ≤ x ≤ 1) were synthesized (and investigated) as anode materials in rechargeable lithium batteries. Five samples labeled as S1-S5 were calcined (fired) at 900 ℃ for 10 h in air, and slowly cooled to room temperature in a tube furnace. The structural properties of the synthesized products have been investigated by X-ray diffraction (XRD), scanning electron microscope (SEM) and Fourier transmission infrared (FTIR). XRD explained that the crystal structures of all samples were monoclinic while S1 and S3 were hexagonal. The morphology of the crystal of S1 was spherical while the other samples were prismatic in shape. SEM investigations explained that S4 had larger grain size diameter of 15-16 μm in comparison with the other samples. S4 sample had the highest conductivity 2.452 × 10~(-4) S cm~(-1). At a voltage plateau located at about 1.55 V (vs. Li~+), S4 cell exhibited an initial specific discharge capacity of 198 mAh g~(-1). The results of cyclic voltammetry for Li_(4-x)Mg_xTi_(5-x)V_xO_(12)showed that the electrochemical reaction was based on Ti~(4+)/Ti~(3+) redox couple at potential range from 1.5 to 1.7 V. There is a pair of reversible redox peaks corresponding to the process of Li+ intercalation and de-intercalation in the Li-Ti-O oxides.
机译：合成（研究了）式Li_（4-x）Mg_xTi_（5-x）V_xO_（12）（0≤x≤1）的几种取代钛酸酯作为可充电锂电池的负极材料。将五个标记为S1-S5的样品在900℃的空气中煅烧（煅烧）10 h，然后在管式炉中缓慢冷却至室温。通过X射线衍射（XRD），扫描电子显微镜（SEM）和傅立叶透射红外光谱（FTIR）研究了合成产物的结构性能。 XRD解释说，所有样品的晶体结构均为单斜晶，而S1和S3为六方晶。 S1晶体的形态为球形，而其他样品为棱柱形。 SEM研究表明，与其他样品相比，S4的晶粒直径更大，为15-16μm。 S4样品的电导率最高为2.452×10〜（-4）S cm〜（-1）。在约1.55 V（vs. Li〜+）的电压平稳状态下，S4电池的初始比放电容量为198 mAh g〜（-1）。 Li_（4-x）Mg_xTi_（5-x）V_xO_（12）的循环伏安法结果表明，电化学反应基于Ti〜（4 +）/ Ti〜（3+）氧化还原对，且电势范围为1.5至1.7V。存在一对可逆的氧化还原峰，分别对应于Li-Ti-O氧化物中Li +嵌入和去嵌入的过程。

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