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Asynchronous stoichiometric response in lithium iron phosphate batteries

机译：磷酸铁锂电池的异步化学计量响应

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摘要

Operando energy-dispersive x-ray diffraction (EDXRD) was carried out on a newly formed 8 Ah lithium iron phosphate (LiFePO_4) battery with the goal of elucidating the origin of asynchronous phase transformation commonly seen with in situ x-ray diffraction studies. The high-energy photons at the NSLS X17B1 beamline allow for penetration into a fully assembled battery and therefore negate any need for a specially designed in situ cell which often uses modified current collectors to minimize x-ray attenuation. Spatially-and-temporally resolved phase-mapping was conducted with a semiquantitative reference intensity ratio (RIR) analysis to estimate the relative abundance of the delithiated phase. The data show an asynchronous response in the stoichiometry versus the electrochemical profile and suggest limited diffusion in the electrode toward the end of discharge. Our results confirm that the asynchronous electrode response is not just limited to specially designed cells but occurs in fully assembled cells alike. We attribute this behavior to be a conseauence of Derformins a local measurement over a wide-area heterogeneous reaction.
机译：在新形成的8 Ah磷酸铁锂（LiFePO_4）电池上进行Operando能量色散X射线衍射（EDXRD），目的是阐明通常在原位X射线衍射研究中看到的异步相变的起源。 NSLS X17B1光束线处的高能光子可以穿透到完全组装的电池中，因此不需要任何特别设计的原位电池，该电池通常使用改进的集电器以最小化X射线衰减。使用半定量参考强度比（RIR）分析进行时空分辨的相位映射，以估算去锂相的相对丰度。数据显示化学计量相对于电化学分布的异步响应，并表明在电极中向放电末期扩散受限。我们的结果证实，异步电极响应不仅限于专门设计的电池，而且在完全组装的电池中同样会发生。我们将此行为归因于Derformins在广域异质反应中的局部测量。

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  • 来源
    《Journal of Materials Research》 |2015年第3期|417-423|共7页
  • 作者

    William A. Paxton; E. Koray Akdogan; Ilyas Savkliyildiz; Ankur U. Choksi; Scott X. Silver; Thomas Tsakalakos; Zhong Zhong;

  • 作者单位

    Materials Science and Engineering, Rutgers, The State University of New Jersey, Piscataway, New Jersey 08854, USA;

    Materials Science and Engineering, Rutgers, The State University of New Jersey, Piscataway, New Jersey 08854, USA;

    Materials Science and Engineering, Rutgers, The State University of New Jersey, Piscataway, New Jersey 08854, USA;

    Materials Science and Engineering, Rutgers, The State University of New Jersey, Piscataway, New Jersey 08854, USA;

    Materials Science and Engineering, Rutgers, The State University of New Jersey, Piscataway, New Jersey 08854, USA;

    Materials Science and Engineering, Rutgers, The State University of New Jersey, Piscataway, New Jersey 08854, USA;

    Photon Sciences, Brookhaven National Laboratory, Upton, New York 11973, USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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  • 正文语种 eng
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