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Parker一班

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[交流] 大牛Gerbrand Ceder最新超级无敌锂电力作（EES，2015年10月05日）已有7人参与

题目：A new class of high capacity cation-disordered oxides for rechargeable lithium batteries: Li–Ni–Ti–Mo oxides

作者：Jinhyuk Lee,a Dong-Hwa Seo,a Mahalingam Balasubramanian,b Nancy Twu,a Xin Li,ac Gerbrand Ceder*de
         （虽然被Goodenough骂了一顿，但送你一句汪峰老师的歌：“哦别哭亲爱的人我们要坚强我们要微笑...”）
      * Corresponding authors
      a Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, USA
      b X-ray Science Division, Advanced Photon Source, Argonne National Laboratory, Argonne, USA
      c John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, USA
      d Department of Materials Science and Engineering, UC Berkeley, Berkeley, USA  E-mail: gceder@berkeley.edu
      e Materials Science Division, Lawrence Berkeley National Laboratory, Berkeley, USA

摘要：Recent successes with disordered Li-excess materials and applications of percolation theory have highlighted cation-disordered oxides as high capacity and energy density cathode materials. In this work, we present a new class of high capacity cation-disordered oxides, lithium-excess nickel titanium molybdenum oxides, which deliver capacities up to 250 mA h g−1. These materials were designed from percolation theory which predicts lithium diffusion to become facile in cation-disordered oxides as the lithium-excess level increases (x > 1.09 in LixTM2−xO2). The reversible capacity and rate capability in these compounds are shown to considerably improve with lithium excess. In particular, Li1.2Ni1/3Ti1/3Mo2/15O2 delivers up to 250 mA h g−1 and 750 W h kg−1 (～3080 W h l−1) at 10 mA g−1. Combining in situ X-ray diffraction, X-ray absorption near edge spectroscopy, electron energy loss spectroscopy, and electrochemistry, we propose that first charging Li1.2Ni1/3Ti1/3Mo2/15O2 to 4.8 V occurs with Ni2+/Ni～3+ oxidation, oxygen loss, and oxygen oxidation in this sequence, after which Mo6+ and Ti4+ can be reduced upon discharge. Furthermore, we discuss how oxygen loss with lattice densification can affect lithium diffusion in the material by decreasing the Li-excess level. From this understanding, strategies for further improvements are proposed, setting new guidelines for the design of high performance cation-disordered oxides for rechargeable lithium batteries.

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