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説明:

LiCoO2 has been used as the cathode material employed in lithium-ion batteries since their birth, and efforts to improve its performance are still in progress. For example, complete use of lithium provides the theoretical capacity as high as 274 mAh g−1; however, charge-discharge cycling with such a high capacity leads to rapid degradation. The degradation mechanism has been intensively studied in order to increase the practical capacity. Although phase transitions taking place in high-voltage charging have been considered to affect the cycling performance, side reactions induced by the high-voltage charging always overlap to blur the effects of phase transitions on the electrode properties. This study has unveiled the relation between the phase transition and electrode properties by employing a solid electrolyte that suppresses the side reactions efficiently. Electrochemical impedance spectroscopy combined with in-situ X-ray diffraction shows clear correlation between phase transition from O3 to H1-3 and drastic increase in the electrode resistance. The increasing resistance is attributable to formation of narrow interlayers with gallery height of 4.2 Å that impede lithium-ion diffusion.

権利情報:

• Creative Commons BY Attribution 4.0 International
  

キーワード: Battery

刊行年月日: 2021-12-27

出版者: American Chemical Society (ACS)

掲載誌:

• ACS Applied Energy Materials (ISSN: 25740962) vol. 4 issue. 12 p. 14372-14379

研究助成金:

• Ministry of Education, Culture, Sports, Science and Technology Materials Processing Science project (Matereali
• Japan Society for the Promotion of Science JP19H05813
• Japan Science and Technology Agency JPMJPF2016
• Advanced Low Carbon Technology Research and Development Program

原稿種別: 出版者版 (Version of record)

MDR DOI:

公開URL: https://doi.org/10.1021/acsaem.1c03046

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更新時刻: 2024-09-11 08:30:23 +0900

MDRでの公開時刻: 2024-09-11 08:30:23 +0900