Lithium Superionic Conducting Oxysulfide Solid Electrolyte with Excellent Stability against Lithium Metal for All-Solid-State Cells
Lithium Superionic Conducting Oxysulfide Solid Electrolyte with Excellent Stability against Lithium Metal for All-Solid-State Cells
复制标题
用于全固态电池的锂超离子导电硫氧化物固体电解质，对金属锂具有优异的稳定性
DOI：
10.1149/2.0311602jes
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发表时间：
2016-01-01
影响因子：
3.9
通讯作者：
Xu, Xiaoxiong
中科院分区：
文献类型：
--
作者：
Tao, Yicheng;Chen, Shaojie;Xu, Xiaoxiong
对于以金属锂为负极的高能电池，电解液是影响电池性能的最关键因素之一。本文采用优化的机械球磨工艺和热处理工艺制备了75 Li（2）S中心点（25-x）P2 S5中心点xP（2）O（5）（mol%）固体电解质。用1mol%P_2O_5取代的电解质在室温下表现出最高的电导率，为8 × 10 ~（-4）S cm ~（-1），与原始样品相比提高了56%。提高的电导率可以归因于Li+-离子扩散的活化能的降低。制备的75 Li（2）S中心点24 P（2）S（5）中心点1 P（2）O（5）电解质具有良好的电化学稳定性和与金属锂电极的相容性。具有LiCoO 2/75 Li（2）S中心点24 P（2）S（5）中心点1 P（2）O（5）/Li结构的全固态电池在0.1C下显示出109 mAh g（-1）的放电容量，并且在25 ℃下30次循环后显示出85.2%的高容量保持率，其性能优于以75 Li（2）S中心点25 P（2）S（5）为电解质的电池。(C)2015年电化学学会。
For the high-energy battery using Li metal as a negative electrode, the electrolyte is one of the most critical factors that significantly affects the cell performance. Herein, new 75Li(2)S center dot (25-x) P2S5 center dot xP(2)O(5) (mol%) solid state electrolytes are prepared by optimized mechanical milling technique and subsequent heat-treatment process. The electrolyte substituted with 1 mol% P2O5 presents the highest conductivity of 8 x 10(-4) S cm(-1) at room temperature, which increases up to 56% compared to that of the pristine sample. The enhanced conductivity could be attributed to the decrease of the activation energy for Li+-ion diffusion. The as-prepared 75Li(2)S center dot 24P(2)S(5) center dot 1P(2)O(5) electrolyte exhibits good electrochemical stability and compatibility with the metallic lithium electrode. The all-solid-state cell with a structure of LiCoO2/75Li(2)S center dot 24P(2)S(5) center dot 1P(2)O(5)/Li shows a discharge capacity of 109 mAh g(-1) at 0.1 C and high capacity retention 85.2% after 30 cycles at 25 degrees C, which are better than these of the cell use the 75Li(2)S center dot 25P(2)S(5) as electrolyte. (C) 2015 The Electrochemical Society.