High-Voltage LiCoO2 Material Encapsulated in a Li4Ti5O12Ultrathin Layer by High-Speed Solid-Phase Coating Process
High-Voltage LiCoO2 Material Encapsulated in a Li4Ti5O12Ultrathin Layer by High-Speed Solid-Phase Coating Process
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采用高速固相涂层工艺将高压 LiCoO2 材料封装在 Li4Ti5O12 超薄层中
DOI：
10.1021/acsaem.9b02291
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发表时间：
2020-02
影响因子：
6.4
通讯作者：
Sun Shi-Gang
中科院分区：
文献类型：
--
作者：
Wang Chuan-Wei;Zhou Yao;You Jin-Hai;Chen Jian-De;Zhang Zheng;Zhang Shao-Jian;Shi Chen-Guang;Zhang Wei-Dong;Zou Ming-Hua;Yu Yang;Li Jun-Tao;Zeng Lei-Ying;Huang Ling;Sun Shi-Gang
LiCoO2（LCO）阴极由于其稳定的电化学性能在材料市场，特别是在传统锂离子电池中得到了广泛的应用。提高工作截止电位是提高LCO电池容量的有效途径；然而，高工作电位通常会导致Co3+的严重溶解和固体电解质间相（SEI）层的广泛生长，导致电化学性能的快速退化。本文采用高速固相镀膜的方法，将铝（Al）掺杂的licoo2封装在连续Li4Ti5O12（LTO）层中，制备了高压阴极。通过原位XRD、XPS和XAS分析，表征和评价了涂层在循环过程中的化学成分演变。在初始充放电循环中，在LTO涂层缺陷部位析出的氟化铝（AlF3）可以有效地增强涂层的结构完整性，防止LCO与液体电解质发生不良副反应而被腐蚀。在0.2℃下循环100次后，改性LCO的容量保持率高达89.9%。本研究建立的高速固相涂层方法可以直接扩大规模，为大规模生产稳定的高压LCO正极材料提供了高度商业化的途径。
The LiCoO2(LCO) cathode has been widely used in material markets, especially in conventional lithium ion batteries, due to its stable electrochemical performance. Increasing the working cutoff potential represents an efficient pathway to boost the capacity of LCO batteries; however, high working potentials usually induce severe Co3+dissolution and extensive growth of solid electrolyte interphase (SEI) layer, leading to rapid degradation of the electrochemical performance. In this work, a high voltage cathode is prepared by the encapsulation of aluminum (Al)-doped LiCoO2in a continuous Li4Ti5O12(LTO) layer using a high-speed solid-phase coating method. The chemical composition evolution of the coating layer during the cycling process was characterized and evaluated through in situ XRD, XPS, and XAS analyses. The precipitation of aluminum fluoride (AlF3) at the defective sites of the LTO coating layer in the initial charge–discharge cycles effectively was found to fortify the structural integrity of the coating layer and prevent the etching of the LCO from undesirable side reactions with the liquid electrolyte. The modified LCO demonstrated an excellent capacity retention of 89.9% after 100 cycles at 0.2 C. The high-speed solid-phase coating method established in this study could be scaled up straightforwardly, providing a highly commercializable approach for large-scale production of stable high-voltage LCO cathode materials.
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