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Unravelling the Role of Electrochemically Active FePO 4 Coating by Atomic Layer Deposition for Increased High-Voltage Stability of LiNi 0.5 Mn 1.5 O 4 Cathode Material

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LiNi 0.5 Mn 1.5 O 4 (LNMO) is a derivative of the commercialized spinel LiMn 2 O 4 with Ni 2+ and Mn 4+ occupying two octahedral sites of 4a and 16d, respectively aimed at suppressing the intrinsic defi ciencies such as the Jahn–Teller distortion of Mn 3+with the same theoretical capacity as LiMn 2 O 4 (148 mAh g –1 ). [ 1 ]
In addition, since the working mechanism of LiNi 0.5 Mn 1.5 O 4 is mainly the redox couple of Ni 2+ /Ni 4+ , the theoretical operating voltage reaches 4.7 V (vs Li + /Li) compared with 4.0 V for LiMn 2 O 4 (vs Li + /Li). [ 1,2 ] Such a high voltage inevitably involves the aggressive oxidation of the electrolyte and the dissolution
of transitional metals, which cause the capacity fading. [ 3 ] In order to overcome these drawbacks, various strategies such as surface modifi cations using metal oxides and phosphates like Al 2 O 3 , [ 4 ] ZnO, [ 5 ] MgO, [ 6 ] ZrO 2 , [ 7 ] Li 3 PO 4 , [ 8 ] and AlPO 4 [ 9 ] have been studied. Most of these coatings are, however, still restricted to the poor conductivity and/or nonuniformity.

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Ketersediaan

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Informasi Detail

Judul Seri

Adv. Sci.

No. Panggil

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Penerbit

: The Authors., 2015

Deskripsi Fisik

Adv. Sci. 2015, 2, 1500022

Bahasa

English

ISBN/ISSN

DOI: 10.1002/advs.20

Klasifikasi

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Tipe Isi

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Tipe Media

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Tipe Pembawa

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Edisi

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Subjek

KESEHATAN

Info Detail Spesifik

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Pernyataan Tanggungjawab

Wati/Agus

Versi lain/terkait

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