Large Polarization of Li4Ti5O12 Lithiated to 0 V at Large Charge/Discharge Rates

详细信息    查看全文

• 作者：Cuiping Han ; Yan-Bing He ; Shuan Wang ; Chao Wang ; Hongda Du ; Xianying Qin ; Zhiqun Lin ; Baohua Li ; Feiyu Kang
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2016
• 出版时间：July 27, 2016
• 年：2016
• 卷：8
• 期：29
• 页码：18788-18796
• 全文大小：667K
• 年卷期：0
• ISSN：1944-8252

文摘

The ability to enhance the specific capacity of Li₄Ti₅O₁₂ (LTO) is of practical significance and offers the opportunity to increase the energy density of a full LTO-based battery. Widening the discharge cutoff voltage to 0 V is an effective way to increase the capacity of LTO at low current density. However, whether the specific capacity of LTO at large current rates can be enhanced remains largely unknown. Herein, intriguingly, we found that, when cycled down to 0 V (i.e., from 1.0−2.5 to 0−25 V), LTO exhibited greatly enhanced specific capacity at low rates (<5 C), while it showed a rapid capacity fading and a greatly increased charge/discharge potential gap at high rates (>10 C). The decreased lithium-ion diffusion caused by extra lithium-ion intercalation together with increased internal impedance significantly enhances the polarization and reduces the electrochemical reaction kinetics, which, in turn, hinders the lithiation reaction from LTO to Li₇Ti₅O₁₂ and further to Li₉Ti₅O₁₂.