Preparation of Li7La3Zr2O12 solid electrolyte via a sol-gel method
Preparation of Li7La3Zr2O12 solid electrolyte via a sol-gel method
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DOI：
10.1016/j.ceramint.2013.09.009
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发表时间：
2014-04-01
影响因子：
5.2
通讯作者：
Koishi, Masaki
中科院分区：
文献类型：
--
作者：
Kotobuki, Masashi;Koishi, Masaki
在本研究中，Li 7 La 3 Zr 2 O 12（LLZ），这已被认为是一个有前途的固体电解质为下一代锂离子电池，通过溶胶凝胶法制备，以降低煅烧温度。前驱体溶胶由乙酸锂、乙酸镧和四丁氧基锆制备。凝胶化后，在700 ℃下加热凝胶，得到主要由La 2 Zr 2 O 7组成的白色粉末。通过在1000摄氏度或1100摄氏度下煅烧来制备烧结球团。在1000 ℃下煅烧的颗粒中含有具有低Li离子传导率的四方相LLZ。在1100摄氏度下煅烧后，四氢LLZ转变成具有高Li离子导电性的立方相。采用溶胶-凝胶法，在1100 ℃下煅烧后可以获得α-相LLZ，这比常规固相反应中的温度低130 ℃。所制备的立方LLZ的锂离子电导率为1.5 × 10（-4）S cm（-1），这与先前报道的值相当。结果表明，采用溶胶-凝胶法可以在低温下成功制备出具有高锂离子电导率的立方结构锂离子电池。(C)2013 Elsevier Ltd和Techna Group S.r.l. All rights reserved.
In this research, Li7La3Zr2O12 (LLZ), which has been recognized as a promising solid electrolyte for next-generation Li-ion batteries, is prepared by a sol gel method to lower the calcination temperature. A precursor sol is prepared from lithium acetate, lanthanum acetate and zirconium tetrabutoxide. After gelation, the gel is heated at 700 degrees C, and a white powder, which consisted mainly of La2Zr2O7, is obtained. Sintered pellets are prepared by calcination at 1000 degrees C or 1100 degrees C. The tetragonal-phase LLZ with low Li-ion conductivity is contained in the pellet calcined at 1000 degrees C. After the calcination at 1100 degrees C, the tetragonal LLZ transforms into a cubic phase which possesses high Li-ion conductivity. With the sol gel method, the cubic-phase LLZ can be obtained after calcination at 1100 degrees C, which is 130 degrees C lower than the temperature in conventional solid-state reaction. The Li-ion conductivity of the prepared cubic LLZ is 1.5 x 10(-4) S cm(-1), which is comparable with the previously reported values. It is concluded that the cubic LLZ with high Li-ion conductivity can be successfully prepared at low temperature using the sol gel method. (C) 2013 Elsevier Ltd and Techna Group S.r.l. All rights reserved.