Improving the Electrochemical Activity of LiMnPO4 Via Mn-Site Substitution

被引：114
作者：
Wang, Deyu [1 ]
Ouyang, Chuying [2 ,4 ]
Drezen, Thierry [3 ]
Exnar, Ivan [3 ]
Kay, Andreas [1 ]
Kwon, Nam-Hee [3 ]
Gouerec, Pascal [3 ]
Miners, James H. [3 ]
Wang, Mingkui [1 ]
Graetzel, Michael [1 ]
机构：
[1] Ecole Polytech Fed Lausanne, Lab Photon & Interfaces, CH-1015 Lausanne, Switzerland
[2] Ecole Polytech Fed Lausanne, Chaire Phys Numer Mat Condensee, CH-1015 Lausanne, Switzerland
[3] Ecole Polytech Fed Lausanne, High Power Lithium HPL SA, PSA B, CH-1015 Lausanne, Switzerland
[4] Jiangxi Normal Univ, Dept Phys, Nanchang 330022, Peoples R China
来源：
JOURNAL OF THE ELECTROCHEMICAL SOCIETY | 2010年 / 157卷 / 02期
关键词：
density functional theory; electrical conductivity; electrochemistry; electronic structure; lithium compounds; manganese compounds; secondary cells; solid solutions; stoichiometry; LIFEPO4 SYNTHESIS ROUTES; PHOSPHO-OLIVINES; CATHODE MATERIALS; 1ST PRINCIPLES; LIXMPO4; M; LITHIUM; PERFORMANCE; IRON; CONDUCTIVITY; FE;
D O I：
10.1149/1.3271112
中图分类号：
O646 [电化学、电解、磁化学];
学科分类号：
081704 ;
摘要：
HPL SA report the modification of the electrochemical performance of lithium manganese phosphate (LiMnPO4) via Mn-site bivalent substitution. Manganese (10%) is substituted with iron, nickel, magnesium, or zinc. These substituents are shown via an X-ray to form solid solutions. The choice of substituent is demonstrated to have a strong influence on the electrochemical performance. The optimum performance improvement was achieved when 10% of Fe is substituted. This is ascribed to a smaller crystallite and a higher electronic conductivity observed in this material: Presumably Fe plays a role in hindering the crystallite growth and in increasing the carrier's transportation. Electronic structures were calculated by density function theory to understand the different influences of substitute cations.
引用
收藏
页码：A225 / A229
页数：5
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