Synthesis and lithium insertion properties of ramsdellite LixTiO2 anode materials
Synthesis and lithium insertion properties of ramsdellite LixTiO2 anode materials
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DOI：
10.1016/j.materresbull.2015.06.014
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发表时间：
2015-10
影响因子：
5.4
通讯作者：
I. Tsuyumoto;T. Moriguchi
中科院分区：
文献类型：
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作者：
I. Tsuyumoto;T. Moriguchi
在4.8%H_2中，1100 °C下加热0- 1h，成功地制备了还原型Ramsdellite Li_xTiO_2（x= 0.47）。XRD数据得到很好的修正，空间群为Pnma，a = 0.96076 nm，B= 0.29514 nm，c = 0.50276 nm。当加热时间延长到1.25 ~ 4 h时，斜方晶系LixTiO 2转变为金红石-斜方晶系共生相。斜方晶系LixTiO 2在1.0-2.5 V（相对于Li）范围内的容量在0.8 C速率（0.13 mA mg-1）下为208 mAh g-1，显著大于氧化形式的斜方晶系Li 2 Ti 3 O 7的容量。锂的嵌入和脱嵌分两个阶段进行：在较高电位（1.4-2.3 V）下的斜坡区和在较低电位（1.3-1.4 V）下的平台区。
Ramsdellite LixTiO2(x= 0.47) with reduced form is successfully prepared as a single phase by heating an amorphous lithium peroxo-polytitanate in 4.8% H2at 1100 °C for 0–1 h. The XRD data are well refined with the space groupPnmawitha= 0.96076 nm,b= 0.29514 nm andc= 0.50276 nm. The ramsdellite LixTiO2transforms into a rutile–ramsdellite intergrowth phase by extending the heating time to 1.25–4 h. The capacity of the ramsdellite LixTiO2in the region of 1.0–2.5 V (vs Li) is 208 mAh g−1at 0.8 C rate (0.13 mA mg−1), substantially larger than that of the ramsdellite Li2Ti3O7with oxidized form. The lithium insertion and deinsertion proceeds in two stages: a sloping region at higher potential (1.4–2.3 V) and a plateau region at lower potential (1.3–1.4 V).