Realizing the Single-Phase Spinel-Type Sodium Titanium Oxide with the Li4Ti5O12-like Structure for Building Stable Sodium-Ion Batteries.,ACS Applied Materials & Interfaces

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Realizing the Single-Phase Spinel-Type Sodium Titanium Oxide with the Li4Ti5O12-like Structure for Building Stable Sodium-Ion Batteries.
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2020-02-06 , DOI: 10.1021/acsami.9b21925
Mitsunori Kitta ₁ , Toshikatsu Kojima ₁ , Riki Kataoka ₁ , Koji Yazawa ₂ , Kohei Tada ₁

Affiliation

Sodium titanium oxide with a spinel-type structure is suitable for the stable sodium-intercalation host for the negative electrode of sodium-ion batteries, such as the spinel-type lithium titanium oxide (Li4Ti5O12, LTO) material for lithium-ion batteries. Recently, this has been partly discovered as the Na3LiTi5O12 (NTO) phase in the LTO particle. However, the single-phase NTO material has never been obtained, preventing accurate material characterizations and applications. Here, we successfully realized the NTO material with the single-phase by the chemical sodium insertion-extraction process. The chemical sodium-inserted LTO material is well converted to the pure NTO phase in the single particle level, via following chemical oxidation by water. The purified material was about 97 mol % of NTO as the single-phase spinel structure with a = 8.746 Å. The basic lattice framework of the prepared NTO was confirmed to be the same as that of the LTO. The single-phase NTO electrode shows 0.8 V versus Na+/Na of the Na-insertion and extraction potential, and 99.4% of Na-insertion capacity with 99.7% of Coulombic efficiency during 200 cycles of the Na-ion half-cell experiment. Further, the Na2Fe2(SO4)3/NTO full-cell shows 3 V-class stable charge-discharge character during 100 cycles. This excellent stability of Na-insertion and extraction properties of single-phase NTO extends the range of constructing safe and stable high-voltage oxide-based sodium-ion battery cells for practical use.

中文翻译：

实现具有类似Li4Ti5O12的结构的单相尖晶石型氧化钛钛，以制造稳定的钠离子电池。

具有尖晶石型结构的钠钛氧化物适合作为钠离子电池的负极的稳定的钠嵌入主体，例如锂离子电池的尖晶石型锂钛氧化物（Li4Ti5O12，LTO）材料。最近，已在LTO颗粒中部分发现为Na3LiTi5O12（NTO）相。但是，从未获得过单相NTO材料，这妨碍了准确的材料表征和应用。在这里，我们通过化学钠插拔工艺成功实现了单相NTO材料。经过水的化学氧化作用后，插入钠的LTO化学材料可以在单个颗粒水平上很好地转化为纯NTO相。纯化的材料为约97摩尔％的NTO，为单相尖晶石结构，a = 8.746Å。确认所制备的NTO的基本晶格框架与LTO相同。在Na离子半电池实验的200个循环中，单相NTO电极相对于Na + / Na的插入和提取电位为0.8 V，Na插入容量为99.4％，库仑效率为99.7％。此外，Na2Fe2（SO4）3 / NTO全电池在100个循环中显示3 V级稳定充放电特性。单相NTO的优异的Na插入稳定性和萃取性能扩展了构建安全，稳定的实用高压氧化物基钠离子电池的范围。在200次Na-离子半电池实验中，Na插入量的4％和库仑效率的99.7％。此外，Na2Fe2（SO4）3 / NTO全电池在100个循环中显示3 V级稳定充放电特性。单相NTO的优异的Na插入稳定性和萃取性能扩展了构建安全，稳定的实用高压氧化物基钠离子电池的范围。在200次Na-离子半电池实验中，Na插入量的4％和库仑效率的99.7％。此外，Na2Fe2（SO4）3 / NTO全电池在100个循环中显示3 V级稳定充放电特性。单相NTO的优异的Na插入稳定性和萃取性能扩展了构建安全，稳定的实用高压氧化物基钠离子电池的范围。

更新日期：2020-02-17

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