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A formation process to improve the cycling stability of carbon-coated Li 2 MnSiO 4 Lithium-ion cathode materials

Solid State Ionics, ISSN: 0167-2738, Vol: 370, Page: 115749
2021
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Article Description

Nitrogen-doped Li 2 MnSiO 4 /C (LMS/CN) was synthesized by an acetic acid-assisted sol-gel route. To improve the cycling stability of the LMS/CN cathodes, five formation cycles were employed, by charging cells to 4.5 V and 4.6 V vs. Li + /Li prior to operation cycles, where the cells were charged to a higher potential of 4.8 V. The LMS/CN cells charged to 4.5 V and 4.6 V had 30-cycle capacity retention values of 72.5 and 74.5%, respectively, compared to 60.3% for cells that had not undergone reduced-potential formation cycles. The formation cycles improved the structure and stability of the cathode electrolyte interphase (CEI). Reduced charge transfer and Li + migration resistance and improved retention of octahedral Mn O coordination were shown by ex situ XANES, XPS and electrochemical impedance spectroscopy.

Bibliographic Details

Thanya Phraewphiphat; Adisak Promwicha; Phontip Tammawat; Pimpa Limthongkul; Prae Chirawatkul; Worawarit Kobsiriphat

Elsevier BV

Chemistry; Materials Science; Physics and Astronomy

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