High-Performance Lithium-Rich Layered Oxide Material: Effects of Preparation Methods on Microstructure and Electrochemical Properties.

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ID: 82727
2020
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Abstract
Lithium-rich layered oxide is one of the most promising candidates for the next-generation cathode materials of high-energy-density lithium ion batteries because of its high discharge capacity. However, it has the disadvantages of uneven composition, voltage decay, and poor rate capacity, which are closely related to the preparation method. Here, 0.5LiMnO·0.5LiMnNiCoO was successfully prepared by sol-gel and oxalate co-precipitation methods. A systematic analysis of the materials shows that the 0.5LiMnO·0.5LiMnNiCoO prepared by the oxalic acid co-precipitation method had the most stable layered structure and the best electrochemical performance. The initial discharge specific capacity was 261.6 mAh·g at 0.05 C, and the discharge specific capacity was 138 mAh·g at 5 C. The voltage decay was only 210 mV, and the capacity retention was 94.2% after 100 cycles at 1 C. The suppression of voltage decay can be attributed to the high nickel content and uniform element distribution. In addition, tightly packed porous spheres help to reduce lithium ion diffusion energy and improve the stability of the layered structure, thereby improving cycle stability and rate capacity. This conclusion provides a reference for designing high-energy-density lithium-ion batteries.
Oksida berlapis kaya litium merupakan salah satu kandidat paling menjanjikan untuk material katoda generasi berikutnya pada baterai ion litium berdensitas energi tinggi karena kapasitas pengosongannya yang tinggi. Namun, material ini memiliki kelemahan berupa komposisi yang tidak merata, peluruhan tegangan, dan kapasitas laju yang buruk, yang berkaitan erat dengan metode preparasinya. Pada penelitian ini, 0.5LiMnO·0.5LiMnNiCoO berhasil dipreparasi melalui metode sol-gel dan kopresipitasi oksalat. Analisis sistematis terhadap material tersebut menunjukkan bahwa 0.5LiMnO·0.5LiMnNiCoO yang dipreparasi menggunakan metode kopresipitasi asam oksalat memiliki struktur berlapis yang paling stabil dan kinerja elektrokimia yang paling baik. Kapasitas spesifik pengosongan awal mencapai 261,6 mAh·g pada 0,05 C, dan kapasitas spesifik pengosongannya adalah 138 mAh·g pada 5 C. Peluruhan tegangan hanya sebesar 210 mV, dan retensi kapasitas mencapai 94,2% setelah 100 siklus pada 1 C. Penekanan peluruhan tegangan ini dapat diatribusikan pada kandungan nikel yang tinggi dan distribusi unsur yang seragam. Selain itu, bola-bola berpori yang tersusun rapat membantu menurunkan energi difusi ion litium dan meningkatkan stabilitas struktur berlapis, sehingga meningkatkan stabilitas siklus dan kapasitas laju. Kesimpulan ini memberikan acuan untuk merancang baterai ion litium berdensitas energi tinggi.
Reference Key
liu2020highperformancematerials Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Liu, Qiming;Zhu, Huali;Liu, Jun;Liao, Xiongwei;Tang, Zhuolin;Zhou, Cankai;Yuan, Mengming;Duan, Junfei;Li, Lingjun;Chen, Zhaoyong;
Journal Materials (Basel, Switzerland)
Year 2020
DOI
E334
URL
Keywords
sol–gel method 0.5li2mno3·0.5limn0.8ni0.1co0.1o2 cathode material co-precipitation method lithium-rich layered oxide voltage decay

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