Citation: XIONG Li-Long, XU You-Long, TAO Tao. Synthesis and Electrochemical Characterization of Ge⁴⁺, Sn⁴⁺ Doped Spinel LiMn₂O₄[J]. Acta Physico-Chimica Sinica doi: 10.3866/PKU.WHXB201302211 shu

Synthesis and Electrochemical Characterization of Ge⁴⁺, Sn⁴⁺ Doped Spinel LiMn₂O₄

1.
Electronic Materials Research Laboratory, Key Laboratory of the Ministry of Education, Xi’an Jiaotong University, Xi’an 710049, P. R. China;International Center for Dielectric Research, Xi’an Jiaotong University, Xi’an 710049, P. R. China

Received Date: 3 December 2012
Available Online: 21 February 2013
Fund Project: 国家自然科学基金(21203145)资助项目 (21203145)

Spinel LiMn₂O₄ materials doped with tetravalent cations Ge⁴⁺ and Sn⁴⁺ were synthesized through solid-state reaction. Analysis of the materials by X-ray diffraction (XRD) and scanning electron microscopy (SEM) suggested that Ge⁴⁺ ions occupied octahedral sites by substituting Mn⁴⁺ ions in the spinel structure to form the solid solution LiMn_2-xGe_xO₄ (x=0.02, 0.04, 0.06), while Sn⁴⁺ ions were present at the surface of the spinel LiMn₂O₄ as SnO₂. The substitution of Mn⁴⁺ with Ge⁴⁺ could suppress the long-range ordering of the Li⁺ ions in the spinel LiMn₂O₄, enhancing its stability. SnO₂ on the surface of LiMn₂O₄ could reduce the acidity of the liquid electrolyte, suppressing acid etching of the LiMn₂O₄ active material. Galvanostatic charge/ discharge tests showed that both Ge⁴⁺ and Sn⁴⁺-modified spinel LiMn₂O₄ materials exhibited significantly higher capacity retention than LiMn₂O₄. The increased capacity retention should benefit the application of spinel LiMn₂O₄ as a cathode material for lithium-ion batteries.
- Spinel LiMn₂O₄,
- Ge⁴⁺ doping,
- Sn⁴⁺ doping,
- Solid-state reaction,
- Cycleability
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沈阳化工大学材料科学与工程学院沈阳 110142

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Synthesis and Electrochemical Characterization of Ge⁴⁺, Sn⁴⁺ Doped Spinel LiMn₂O₄