Premium
High‐Performance Carbon‐LiMnPO 4 Nanocomposite Cathode for Lithium Batteries
Author(s) -
Oh SeungMin,
Oh SungWoo,
Yoon ChongSeung,
Scrosati Bruno,
Amine Khalil,
Sun YangKook
Publication year - 2010
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201000469
Subject(s) - materials science , electrochemistry , nanocomposite , electrode , cathode , carbon black , carbon fibers , dissolution , lithium (medication) , dielectric spectroscopy , chemical engineering , composite material , composite number , medicine , chemistry , natural rubber , engineering , endocrinology
A cathode material of an electrically conducting carbon‐LiMnPO 4 nanocomposite is synthesized by ultrasonic spray pyrolysis followed by ball milling. The effect of the carbon content on the physicochemical and electrochemical properties of this material is extensively studied. A LiMnPO 4 electrode with 30 wt% acetylene black (AB) carbon exhibits an excellent rate capability and good cycle life in cell tests at 55 and 25 °C. This electrode delivers a discharge capacity of 158 mAh g −1 at 1/20 C, 126 mAh g −1 at 1 C, and 107 mAh g −1 at 2 C rate, which are the highest capacities reported so far for this type of electrode. Transmission electron microscopy and Mn dissolution results confirm that the carbon particles surrounding the LiMnPO 4 protect the electrode from HF attack, and thus lead to a reduction of the Mn dissolution that usually occurs with this electrode. The improved electrochemical properties of the C‐LiMnPO 4 electrode are also verified by electrochemical impedance spectroscopy.