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Constructing porous TiO2 crystals by an etching process for long-life lithium ion batteries.
Nanoscale ( IF 5.8 ) Pub Date : 2020-08-20 , DOI: 10.1039/d0nr04861e Shuying Nong 1 , Chenlong Dong , Yexin Wang , Fuqiang Huang
Nanoscale ( IF 5.8 ) Pub Date : 2020-08-20 , DOI: 10.1039/d0nr04861e Shuying Nong 1 , Chenlong Dong , Yexin Wang , Fuqiang Huang
Affiliation
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“Zero strain” materials, which have no volume change when charging and discharging, show ultra-long cycling stabilities when used as lithium-ion battery anodes, making them an area of extreme interest in this decade. For a typical anatase TiO2 crystal, the volume change is 3–4% during Li insertion/extraction, which is not “zero strain”. As the Ti/O packing in the TiO2 lattice is too tight, there is insufficient void space for Li insertion, leading to volume expansion and structural collapse. Herein, pseudo-“zero-strain” TiO2 is achieved via designing TiO2 crystals with abundant inner mesopores, making Ti/O loose-packed via the acid-etching of K2Ti8O17, providing sufficient space for Li intercalation. Instead of the traditional cut-off potential of 1 V used for Ti-/Nb-based anodes, we choose 0.01 V as the cut-off to make the best of the extra capacity contributed by the mesopores. As expected, plenty of mesopores could serve as “Li+-reservoirs” for fast lithium storage, demonstrating exceptional high-rate performance with an average capacity of 109.6 mA h g−1 after 30 000 cycles at 60 C and 100 mA h g−1 at 120 C. Such a strategy of combining a mesoporous structure and cut-off potential regulation may pave a solid pathway for constructing novel high-power anodes.
中文翻译：
通过蚀刻工艺构造长寿命的锂离子电池多孔TiO2晶体。
“零应变”材料在充电和放电时没有体积变化，当用作锂离子电池阳极时表现出超长的循环稳定性，这使它们成为近十年来极为关注的领域。对于典型的锐钛矿型TiO 2晶体，在锂的插入/萃取过程中体积变化为3-4％，这不是“零应变”。由于TiO 2晶格中的Ti / O堆积太紧密，因此没有足够的空隙空间可插入Li，导致体积膨胀和结构崩溃。在本文中，通过设计具有丰富的内部中孔的TiO 2晶体，通过对K 2 Ti进行酸刻蚀使Ti / O松散堆积，从而获得了伪“零应变”的TiO 2。8 O 17，为锂插入提供了足够的空间。代替用于Ti- / Nb基阳极的传统1 V截止电位，我们选择0.01 V作为截止电位，以充分利用中孔所贡献的额外容量。正如预期的那样，大量的中孔的可作为“李+ -reservoirs”用于快速锂存储，证明与109.6毫安汞柱的平均容量特殊的高倍率性能-1在60℃和100mA的汞30 000次循环之后-1在120 C.这种结合中孔结构和截止电位调节的策略可以为构建新型高功率阳极铺平坚实的道路。
更新日期：2020-09-18
中文翻译：
通过蚀刻工艺构造长寿命的锂离子电池多孔TiO2晶体。
“零应变”材料在充电和放电时没有体积变化，当用作锂离子电池阳极时表现出超长的循环稳定性，这使它们成为近十年来极为关注的领域。对于典型的锐钛矿型TiO 2晶体，在锂的插入/萃取过程中体积变化为3-4％，这不是“零应变”。由于TiO 2晶格中的Ti / O堆积太紧密，因此没有足够的空隙空间可插入Li，导致体积膨胀和结构崩溃。在本文中，通过设计具有丰富的内部中孔的TiO 2晶体，通过对K 2 Ti进行酸刻蚀使Ti / O松散堆积，从而获得了伪“零应变”的TiO 2。8 O 17，为锂插入提供了足够的空间。代替用于Ti- / Nb基阳极的传统1 V截止电位，我们选择0.01 V作为截止电位，以充分利用中孔所贡献的额外容量。正如预期的那样，大量的中孔的可作为“李+ -reservoirs”用于快速锂存储，证明与109.6毫安汞柱的平均容量特殊的高倍率性能-1在60℃和100mA的汞30 000次循环之后-1在120 C.这种结合中孔结构和截止电位调节的策略可以为构建新型高功率阳极铺平坚实的道路。
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