Reduction of charge transfer resistance at the lithium phosphorus oxynitride/lithium cobalt oxide interface by thermal treatment
Reduction of charge transfer resistance at the lithium phosphorus oxynitride/lithium cobalt oxide interface by thermal treatment
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DOI：
10.1016/j.jpowsour.2005.03.073
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发表时间：
2005-08
影响因子：
9.2
通讯作者：
Y. Iriyama;Tomonori Kako;C. Yada;T. Abe;Z. Ogumi
中科院分区：
文献类型：
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作者：
Y. Iriyama;Tomonori Kako;C. Yada;T. Abe;Z. Ogumi
制备了一种由c轴取向licoo2薄膜和氮化磷锂（LiPON）玻璃电解质组成的全固态薄膜电池。制备好LiPON/ licoo2界面后，473K温度下的热处理降低了界面处的电荷转移电阻，延长热处理时间可进一步降低界面处的电荷转移电阻。薄膜电池经过60min热处理后，单位电极面积的电荷转移电阻（界面电阻率）降至125Ωcm2，约为有机电解质（1moldm−3liclo4溶解在碳酸丙烯酯中）/ licoo2界面（25Ωcm2）的5倍。由于降低了LiPON/ licoo2界面处的电荷转移电阻，热处理使薄膜电池的反应电流大大增加。此外，与使用传统有机电解质的电池相比，经过热处理的薄膜电池表现出稳定的电化学锂插入/提取性能。在超过100次循环中，薄膜电池的伏安图和阻抗谱都保持了初始形状，计算出每次循环的容量保持率为99.9%。
An all-solid-state thin-film battery consisting of a c-axis-oriented LiCoO2thin-film and a lithium phosphorus oxynitride (LiPON) glass electrolyte was fabricated. Thermal treatment at 473K after fabrication of the LiPON/LiCoO2interface decreased the charge transfer resistance at the interface, and the resistance was further reduced by prolonging the thermal treatment time. The charge transfer resistance per unit electrode area (interfacial resistivity) of a film battery thermal-treated for 60min decreased down to 125Ωcm2, which is ca. five times larger than that in the case of an organic electrolyte (1moldm−3LiClO4dissolved in propylene carbonate)/LiCoO2interface (25Ωcm2). Due to the reduction of the charge transfer resistance at the LiPON/LiCoO2interface, the reaction current of the film battery was greatly increased by the thermal treatment. Also, thermally treated film batteries showed stable electrochemical lithium insertion/extraction properties compared with the batteries using conventional organic electrolytes. Both the voltammograms and the impedance spectra of the film battery maintained their initial shape for over 100 cycles, and the capacity retention ratio per cycle was calculated to be 99.9%.