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Li1.4Al0.4Ti1.6(PO4)3 coated Li1.2Ni0.13Co0.13Mn0.54O2 for enhancing electrochemical performance of lithium-ion batteries

Li1.4Al0.4Ti1.6(PO4)3修饰富锂锰基Li1.2Ni0.13Co0.13Mn0.54O2锂离子电池正极材料

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Abstract

Lithium (Li)-rich manganese (Mn)-based cathode Li1.2Ni0.13Co0.13Mn0.54O2 (LRNCM) has attracted considerable attention owing to its high specific discharge capacity and low cost. However, unsatisfactory cycle performance and poor rate property hinder its large-scale application. The fast ionic conductor has been widely used as the cathode coating material because of its superior stability and excellent lithium-ion conductivity rate. In this study, Li1.2Ni0.13Co0.13Mn0.54O2 is modified by using Li1.4Al0.4Ti1.6(PO4)3 (LATP) ionic conductor The electrochemical test results show that the discharge capacity of the resulting LRNCM@LATP1 sample is 198 mA·h/g after 100 cycles at 0.2C, with a capacity retention of 81%. Compared with the uncoated pristine LRNCM (188.4 mA·h/g and 76%), LRNCM after the LATP modification shows superior cycle performance. Moreover, the lithium-ion diffusion coefficient DLi+ is a crucial factor affecting the rate performance, and the DLi+ of the LRNCM material is improved from 4.94×10−13 to 5.68×10−12 cm2/s after modification. The specific capacity of LRNCM@LATP1 reaches 102.5 mA·h/g at 5C, with an improved rate performance. Thus, the modification layer can considerably enhance the electrochemical performance of LRNCM.

摘要

富锂锰基材料Li1.2Ni0.13Co0.13Mn0.54O2(LRNCM)以其优异的放电比容量和低廉的成本成为锂离子电 池正极材料的研究热点。然而,富锂锰基材料存在循环性能和倍率性能差的不足,限制了其商业化的 应用。快离子导体因其具有较好的稳定性和较高的锂离子传导速率等特点,被广泛用于正极材料的包 覆研究。本研究采用溶胶凝胶法合成了Li1.4Al0.4Ti1.6(PO4)3(LATP)快离子导体,并对Li1.2Ni0.13Co0.13Mn0.54O2 正极材料颗粒表面进行包覆改性。电化学测试结果表明,LRNCM@LATP1 样品在0.2C 条件下 循环100 次仍有198 mA·h/g 的放电比容量, 容量保持率达到81%, 相较未包覆的P-LRNCM (放电比容量188.4 mA·h/g,容量保持率76%)表现出更优异的循环性能。离子扩散速率(DLi+)是影响材 料倍率性能的重要因素,包覆1%LATP的LRNCM材料(LRNCM@LATP1)在100 次循环后,DLi+从包覆 前的4.94×10−13 cm2/s 提高到包覆后的5.68×10−12 cm2/s, 材料界面的离子传输能力得到了改善, LRNCM@LATP1 在5C 放电条件下的比容量可以达到102.5 mA·h/g,高倍率性能得到提升。因而, LATP的包覆改性可有效提高Li1.2Ni0.13Co0.13Mn0.54O2的电化学性能,对锂离子正极材料的研究具有重要的 意义。

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Authors and Affiliations

  1. School of Metallurgy and Environment, Central South University, Changsha, 410083, China

    Xiang-wan Lai  (来湘皖), Guo-rong Hu  (胡国荣), Zhong-dong Peng  (彭忠东), Yan-bing Cao  (曹雁冰), Ke Du  (杜柯) & Ye-xiang Liu  (刘业翔)

  2. Central South University, Engineering Research Center of the Ministry of Education for Advanced Battery Materials, Changsha, 410083, China

    Guo-rong Hu  (胡国荣), Zhong-dong Peng  (彭忠东), Yan-bing Cao  (曹雁冰) & Ke Du  (杜柯)

  3. Hunan Provincial Key Laboratory of Nonferrous Value-Added Metallurgy, Central South University, Changsha, 410083, China

    Guo-rong Hu  (胡国荣), Zhong-dong Peng  (彭忠东), Yan-bing Cao  (曹雁冰) & Ke Du  (杜柯)

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  1. Xiang-wan Lai  (来湘皖)
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Contributions

The overarching research goals were developed by LAI Xiang-wan, HU Guo-rong and LIU Ye-xiang. LAI Xiang-wan and CAO Yan-bing conducted the experiments and analyzed the measured results. The initial draft of the manuscript was written by LAI Xiang-wan. LAI Xiang-wan and DU Ke revised the initial draft. LAI Xiang-wan and PENG Zhong-dong replied to reviewers’ comments and revised the final version.

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Correspondence to Guo-rong Hu  (胡国荣).

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The authors declare that they have no conflict of interest.

Foundation item: Project(51772333) supported by the National Natural Science Foundation of China

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Lai, Xw., Hu, Gr., Peng, Zd. et al. Li1.4Al0.4Ti1.6(PO4)3 coated Li1.2Ni0.13Co0.13Mn0.54O2 for enhancing electrochemical performance of lithium-ion batteries. J. Cent. South Univ. 29, 1463–1478 (2022). https://doi.org/10.1007/s11771-022-5037-2

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