Improved electrochemical activity of LiMnPO4 by high-energy ball-milling |
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Authors: | Jiangfeng Ni Yoshiteru KawabeMasanori Morishita Masaharu WatadaTetsuo Sakai |
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Affiliation: | a National Institute of Advanced Industrial Science and Technology, 1-8-31 Midorigaoka, Ikeda, Osaka 563-8577, Japan b GS Yuasa International Ltd, Nishinosho, Kisshoin, Minami-ku, Kyoto 601-8520, Japan |
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Abstract: | Olivine lithium manganese phosphate (LiMnPO4) becomes research focus because of its high energy density and improved thermal stability. However, its application in lithium ion batteries suffers severely from poor electrochemical activity due to low conductivity and structural instability upon the charge and discharge process. By applying a high-energy ball-milling method we succeed in improving the capacity delivery and rate capability. LiMnPO4 materials ball-milled without or with acetylene black are able to deliver a high capacity of 135 and 127 mAh g−1, respectively, more than 50% greater than the pristine one. Particularly, the latter also shows an improved discharge plateau and stable cyclability. High-energy synchrotron radiation X-ray diffraction (XRD), scanning electron microscopy (SEM), Raman spectroscopy, laser particle analysis, and galvanostatic charge and discharge are employed to understand the effect of ball-milling on the LiMnPO4 material. |
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Keywords: | Lithium ion battery Lithium manganese phosphate High-energy ball-milling Electrochemical activity Synchrotron radiation |
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