Study on (100-x)(70Li 2 S-30P 2 S 5 )-xLi 2 ZrO 3 glass-ceramic electrolyte for all-solid-state lithium-ion batteries
Study on (100-x)(70Li 2 S-30P 2 S 5 )-xLi 2 ZrO 3 glass-ceramic electrolyte for all-solid-state lithium-ion batteries
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DOI：
10.1016/j.jpowsour.2017.04.083
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发表时间：
2017-07
影响因子：
9.2
通讯作者：
Lu Penghao;F. Ding;Xuan Zhibin;Jiaquan Liu;Xingjiang Liu;Qiang Xu
中科院分区：
文献类型：
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作者：
Lu Penghao;F. Ding;Xuan Zhibin;Jiaquan Liu;Xingjiang Liu;Qiang Xu
采用振动球磨法制备了（100-x）（70 Li 2S-30 P2 S5）-xLi 2 ZrO 3（x = 0，1，2，5）微晶玻璃。通过物理表征和电化学测试，优化了三元硫化物电解液的组成和热处理工艺。结果表明，Li 2 ZrO 3在Li 2S-P2 S5电解质基体中的最佳取代量为1mol%。99（70 Li 2S-30 P2 S5）-1 Li 2 ZrO 3玻璃陶瓷电解质的适宜热处理温度为285 °C。在所制备的三元电解质样品中，99（70 Li 2S-30 P2 S5）-1 Li 2 ZrO 3玻璃陶瓷电解质在室温下可以表现出最高的电导率，为2.85 × 10 - 3S cm-1，这远高于70 Li 2S-30 P2 S5玻璃陶瓷电解质的电导率。与LiCoO 2/70 Li 2S-30 P2 S5/In-Li全固态锂离子电池相比，LiCoO 2/99（70 Li 2S-30 P2 S5）-1Li2ZrO3/In-Li全固态锂离子电池在第10次充放电循环和第50次充放电循环的放电容量分别提高了41.0%和21.9%。此外，全固态锂离子电池的电化学阻抗谱（EIS）分析表明，在Li 2S-P2 S5电解质基体中添加Li 2 ZrO 3可以降低电极与固体电解质之间的界面电阻。99（70 Li 2S-30 P2 S5）-1 Li 2 ZrO 3玻璃陶瓷电解质的电化学性能的提高归因于Li 2 ZrO 3稳定的晶体结构和较高的锂离子扩散系数。
A novel glass-ceramic electrolyte of (100-x)(70Li2S-30P2S5)-xLi2ZrO3(x = 0, 1, 2, 5) is successfully prepared by a vibratory ball-milling method and followed by a heat-treatment process. Composition of the ternary sulfide electrolyte and the heat-treatment process are optimized by physical characterizations and electrochemical measurements. The testing results show that the optimal substitution quantity of Li2ZrO3into the Li2S-P2S5electrolyte substrate is 1 mol %. An appropriate heat-treatment temperature of 99(70Li2S-30P2S5)-1Li2ZrO3glass-ceramic electrolyte is 285 °C. Among the as-prepared ternary electrolyte samples, 99(70Li2S-30P2S5)-1Li2ZrO3glass-ceramic electrolyte may exhibit the highest conductivity of 2.85 × 10−3S cm−1at room temperature, which is much higher than that of the 70Li2S-30P2S5glass-ceramic electrolyte. Compared to that of the all-solid-state lithium-ion battery of LiCoO2/70Li2S-30P2S5/In-Li, discharge capacities of all-solid-state lithium-ion battery of LiCoO2/99(70Li2S-30P2S5)-1Li2ZrO3/In-Li may increase 41.0% at the 10th charge-discharge cycle and 21.9% at the 50th charge-discharge cycle, respectively. Furthermore, electrochemical impedance spectroscopy (EIS) analyses of all-solid-state lithium-ion batteries reveal that addition of Li2ZrO3into the Li2S-P2S5electrolyte substrate may decrease the interfacial resistance between the electrodes and solid electrolyte. The improvement of electrochemical performances of 99(70Li2S-30P2S5)-1Li2ZrO3glass-ceramic electrolyte is ascribed to both the stable crystal structure and a high lithium-ion diffusion coefficient of Li2ZrO3.