Li-Rich Mn-Mg Layered Oxide as a Novel Ni-/Co-Free Cathode

被引：27

作者：

Lee, Yongseok ^{[1
,2
]}

Park, Hyunyoung ^{[1
,2
]}

Cho, Min-kyung ^{[3
]}

Ahn, Jinho ^{[1
,2
]}

Ko, Wonseok ^{[1
,2
]}

Kang, Jungmin ^{[1
,2
]}

Choi, Yoo Jung ^{[4
]}

Kim, Hyungsub ^{[5
]}

Park, Inchul ^{[6
]}

Ryu, Won-Hee ^{[4
]}

Hong, Jihyun ^{[7
]}

Kim, Jongsoon ^{[1
,2
]}

机构：

[1] Sungkyunkwan Univ, Dept Energy Sci, Suwon 16419, South Korea

[2] Sungkyunkwan Univ, SKKU Inst Energy Sci & Technol SIEST, Suwon 16419, South Korea

[3] Korea Inst Sci & Technol KIST, Adv Anal Ctr, Seoul 02792, South Korea

[4] Sookmyung Womens Univ, Dept Chem & Biol Engn, Seoul 04310, South Korea

[5] Korea Atom Energy Res Inst KAERI, Daejeon 34057, South Korea

[6] Res Inst Ind Sci & Technol RIST, Battery Mat Res Ctr, Incheon 21985, South Korea

[7] Korea Inst Sci & Technol KIST, Energy Mat Res Ctr, Seoul 02792, South Korea

来源：

ADVANCED FUNCTIONAL MATERIALS | 2022年 / 32卷 / 36期

基金：

新加坡国家研究基金会;

关键词：

cathodes; high energy; Li-ion batteries; Li-rich layered oxides; low costs; LI2MNO3; CATHODE; ELECTRONIC-STRUCTURE; REDOX CHEMISTRY; ANIONIC REDOX; ION; DEGRADATION; ACTIVATION; MECHANISM; CAPACITY; VOLTAGE;

D O I：

10.1002/adfm.202204354

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Although Li2MnO3 exhibits high capacity via anionic oxygen redox, it suffers from rapid capacity decay owing to structural disordering accompanying irreversible Mn migration and O-2 release. To promote the reversibility of the anionic redox reaction, Li1.8Mg0.3Mn0.9O3 as a novel cathode material, prepared by partially substituting Li+ and Mn4+ of Li2MnO3 with the redox-inactive Mg2+ as a structural stabilizer is proposed. Li1.8Mg0.3Mn0.9O3 delivers a high specific capacity and energy density of approximate to 310 mAh g(-1) and approximate to 915 Wh kg(-1), respectively. In particular, the power-capability and cycle performance of Li1.8Mg0.3Mn0.9O3 greatly surpass those of Li2MnO3. Through first-principles calculations and various experiments, it is revealed that Mg substitution effectively suppresses the Mn migration by stabilizing Mn cations in the original sites at the charged state. The energetically stabilized layered structure disfavors the distortion of the MnO6 octahedra, which induces the oxygen dimer (O-O) formation through the metal-oxygen decoordination, thus mitigating oxygen release.

引用

页数：13

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