All-solid-state lithium secondary batteries using LiCoO2 particles with pulsed laser deposition coatings of Li2S–P2S5 solid electrolytes
All-solid-state lithium secondary batteries using LiCoO2 particles with pulsed laser deposition coatings of Li2S–P2S5 solid electrolytes
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DOI：
10.1016/j.jpowsour.2010.10.103
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发表时间：
2011-08
影响因子：
9.2
通讯作者：
A. Sakuda;A. Hayashi;T. Ohtomo;Shigenori Hama;M. Tatsumisago
中科院分区：
文献类型：
--
作者：
A. Sakuda;A. Hayashi;T. Ohtomo;Shigenori Hama;M. Tatsumisago
采用脉冲激光沉积(PLD)技术在LiCoO2电极颗粒表面涂覆高导电性的Li2S-P2S5固体电解质，制备了电极-电解液复合材料。用透射电子显微镜观察了全固态电池复合电极层的横截面，研究了复合电极中LiCoO2颗粒的堆积形态和固体电解质的分布。制备了全固体电解质包覆LiCoO2复合电极的全固态电池，并对其性能进行了研究。控制Li2S-P2S5固体电解质在LiCoO2颗粒上的包覆量和包覆材料的电导率，以提高所得到的全固态电池的容量。采用LiCoO2和厚固体电解质涂层的全固态电池，经过120min的生长，容量为65mAhg−1，没有向复合电极中添加任何Li_2S-P_2S_5固体电解质颗粒。通过200℃热处理提高了Li_2S-P_2S_5固体电解质涂层的电导率后，全固态电池的容量进一步提高。此外，还制作了基于固体电解质涂层和添加固体电解质颗粒的复合电极的全固态电池，容量增加到95mAhg−1。
Electrode–electrolyte composite materials were prepared by coating a highly conductive Li2S–P2S5solid electrolyte onto LiCoO2electrode particles using pulsed laser deposition (PLD). Cross-sections of the composite electrode layers of the all-solid-state cells were observed using a transmission electron microscope to investigate the packing morphology of the LiCoO2particles and the distribution of solid electrolyte in the composite electrode. All-solid-state cells based on a composite electrode composed entirely of solid-electrolyte-coated LiCoO2were fabricated, and their performance was investigated. The coating amounts of Li2S–P2S5solid electrolytes on LiCoO2particles and the conductivity of the coating material were controlled to increase the capacity of the resulting all-solid-state cells. All-solid-state cells using LiCoO2with thick solid electrolyte coatings, grown over 120min, had a capacity of 65mAhg−1, without any addition of Li2S–P2S5solid electrolyte particles to the composite electrode. The capacity of the all-solid-state cell increased further after increasing the conductivity of the Li2S–P2S5solid electrolyte coating by heat treatment at 200°C. Furthermore, an all-solid-state cell based on a composite electrode using both a solid electrolyte coating and added solid electrolyte particles was fabricated, and the capacity of the resulting all-solid-state cell increased to 95mAhg−1.