A near dimensionally invariable high-capacity positive electrode material
A near dimensionally invariable high-capacity positive electrode material
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一种几乎尺寸不变的高容量正极材料
DOI：
10.1038/s41563-022-01421-z
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发表时间：
2022
期刊：
影响因子：
41.2
通讯作者：
N. Yabuuchi
中科院分区：
文献类型：
--
作者：
Itsuki Konuma;Damian Goonetilleke;N. Sharma;T. Miyuki;S. Hiroi;K. Ohara;Yukio Yamakawa;Y. Morino;H. B. Rajendra;T. Ishigaki;N. Yabuuchi
提供固有稳定的锂离子电池是一个关键挑战。电化学锂的插入和提取往往会严重改变电极的晶体化学，从而导致电化学循环降解。此外，电极并不是孤立的，这可能很难管理，特别是在全固态电池中。因此，寻找在电化学循环过程中能够可逆地插入和提取大量电荷载体(Li+)的材料，即具有高容量、具有固有稳定性的材料是必要的。本文研究了具有无序岩盐结构的锂过量钒氧化物作为高容量、长寿命的正极材料。纳米Li8/7Ti2/7V4/7O2 In优化的液体电解液提供了超过300 mAh g−1的大可逆容量，具有两个电子的V3+/V5+阳离子氧化还原，与金属锂相比，达到750 WH kg−1。最重要的是，在使用硫化物固体电解液的全固态电池中，观察到高度可逆的锂存储和400 循环没有容量衰减。操纵面同步X射线衍射仪与高精度膨胀法相结合，在电化学循环过程中表现出良好的可逆性和几乎不变的维不变性，这与钒在锂和脱硫化过程中的可逆迁移有关。这项工作展示了一个电极/电解液耦合的例子，它通过多电子过渡金属氧化还原实现高容量和长寿命电池，其结构在循环中几乎不变。
Delivering inherently stable lithium-ion batteries is a key challenge. Electrochemical lithium insertion and extraction often severely alters the electrode crystal chemistry, and this contributes to degradation with electrochemical cycling. Moreover, electrodes do not act in isolation, and this can be difficult to manage, especially in all-solid-state batteries. Therefore, discovering materials that can reversibly insert and extract large quantities of the charge carrier (Li+), that is, high capacity, with inherent stability during electrochemical cycles is necessary. Here lithium-excess vanadium oxides with a disordered rocksalt structure are examined as high-capacity and long-life positive electrode materials. Nanosized Li8/7Ti2/7V4/7O2in optimized liquid electrolytes deliver a large reversible capacity of over 300 mAh g−1with two-electron V3+/V5+cationic redox, reaching 750 Wh kg−1versus metallic lithium. Critically, highly reversible Li storage and no capacity fading for 400 cycles were observed in all-solid-state batteries with a sulfide-based solid electrolyte. Operando synchrotron X-ray diffraction combined with high-precision dilatometry reveals excellent reversibility and a near dimensionally invariable character during electrochemical cycling, which is associated with reversible vanadium migration on lithiation and delithiation. This work demonstrates an example of an electrode/electrolyte couple that produces high-capacity and long-life batteries enabled by multi-electron transition metal redox with a structure that is near invariant during cycling.
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影响因子：
4.9
作者：
Tachikawa, Naoki;Yamauchi, Kento;Watanabe, Masayoshi
通讯作者：
Watanabe, Masayoshi
影响因子：
56.7
作者：
Lee, Yong-Gun;Fujiki, Satoshi;Han, In Taek
通讯作者：
Han, In Taek
过量锂岩盐型高容量锂离子电池正极材料
DOI：
--
发表时间：
2021
期刊：
影响因子：
--
作者：
Naoaki Yabuuchi
通讯作者：
Naoaki Yabuuchi
影响因子：
32.5
作者：
T. Sudayama;K. Uehara;T. Mukai;D. Asakura;Xiang-Mei Shi;Akihisa Tsuchimoto;Benoit Mortemard de Boisse;T. Shimada;Eriko Watanabe;Y. Harada;M. Nakayama;M. Okubo;A. Yamada
通讯作者：
T. Sudayama;K. Uehara;T. Mukai;D. Asakura;Xiang-Mei Shi;Akihisa Tsuchimoto;Benoit Mortemard de Boisse;T. Shimada;Eriko Watanabe;Y. Harada;M. Nakayama;M. Okubo;A. Yamada
富锂Li<sub>2</sub>VO<sub>2</sub>F正极材料中脱锂非晶相的结构表征
影响因子：
8.6
作者：
Hiroi Satoshi;Ohara Koji;Sakata Osami
通讯作者：
Sakata Osami