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首页> 外文期刊>Hyperfine Interactions: Journal Devoted to Research in the Border Regions of Solid State, Atomic and Nuclear Physics >M?ssbauer study of new vanadate glass with large charge-discharge capacity
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M?ssbauer study of new vanadate glass with large charge-discharge capacity

机译：M？ssbauer研究具有高充放电容量的新型钒酸盐玻璃

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Charge-discharge capacity and cyclicity of lithium ion battery (LIB) was evaluated in which 15Li_2O·10Fe_2O_3·xSnO_2·5P_2O_5·(70-x)V_2O_5 glass (x = 0 and 20 in mol%, abbreviated as xLFSPV) was used as a cathode. A local structure of xLFSPV glass before and after charging was investigated by ~(57)Fe- and 119Sn-M?ssbauer spectroscopies. ~(57)Fe-M?ssbauer spectrum of xLFSPV glass with 'x' of 20 was composed of a doublet with isomer shift (δ) of 0.35_(±0.02) mm s~(-1) and quadrupole splitting (δ) of 0.88±0.03 mm s~(-1) due to distorted Fe~(III)O_4 tetrahedra. 119Sn-M?ssbauer spectrum of this glass consisted of a doublet with δ of 0.08±0.01 and δ of 0.52±0.01 mms~(-1) due to distorted Sn~(VI)O_6 octahedra. After discharging the battery from 4.5 to 1.0 V, larger δ of 0.40±0.03 mm s~(-1) and δ of 0.94±0.04 mm s~(-1) were obtained, indicating that both iconicity of Fe-O bonds and local distortion of Fe~(III)O_4 tetrahedra were increased. On the contrary, identical δ of 0.09±0.01 mm s~(-1) and δ of 0.50±0.01 mm s~(-1) were observed in the 119Sn-M?ssbauer spectrum of 20LFSPV glass after the discharge, indicating that chemical environment of Sn~(IV)O_6 octahedra was not affected after the discharge. Charge-discharge curve of LIB containing 20LFSPV glass as a cathode active material recorded under the current density of 8.3 mA g~(-1) (0.011 mA cm~(-2)) between 1.0 and 4.5 V showed a large initial charge capacity of 431.1 mAh g~(-1) and discharge capacity of 382.3 mAh g~(-1), respectively. These results indicate that 20LFSPV glass could be a new cathode active material for LIB.
机译：以15Li_2O·10Fe_2O_3·xSnO_2·5P_2O_5·（70-x）V_2O_5玻璃（x = 0和20，以mol％为单位，缩写为xLFSPV）作为锂离子电池（LIB）的充放电容量和循环性。阴极。用〜（57）Fe-和119Sn-Msssbauer光谱学研究了xLFSPV玻璃在充电前后的局部结构。 “ x”为20的xLFSPV玻璃的〜（57）Fe-M？ssbauer光谱由异构体位移（δ）为0.35_（±0.02）mm s〜（-1）的双峰和四极分裂（δ）组成由于Fe〜（III）O_4四面体变形而导致的0.88±0.03 mm s〜（-1）该玻璃的119Sn-M？ssbauer光谱由一个双峰组成，由于Sn〜（VI）O_6八面体畸变，其δ为0.08±0.01，δ为0.52±0.01 mms〜（-1）。将电池从4.5 V放电至1.0 V后，获得较大的δ0.40±0.03 mm s〜（-1）和δ0.94±0.04 mm s〜（-1），表明Fe-O键的图标性和局部Fe〜（III）O_4四面体的形变增加。相反，在放电后20LFSPV玻璃的119Sn-M？ssbauer光谱中观察到相同的δ，为0.09±0.01 mm s〜（-1）和δ为0.50±0.01 mm s〜（-1），表明化学放电后，Sn〜（IV）O_6八面体的环境不受影响。在8.3 mA g〜（-1）（0.011 mA cm〜（-2））的电流密度下（1.0-4.5 V）记录的以20LFSPV玻璃为正极活性物质的LIB的充放电曲线显示出较大的初始充电容量放电容量分别为431.1 mAh g〜（-1）和382.3 mAh g〜（-1）。这些结果表明20LFSPV玻璃可能是LIB的新型阴极活性材料。

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