Journal of The Electrochemical Society, A139 （《电化学社会,A139）.pdf

Journal of The Electrochemical Society, 158 2 A139-A145 2011 A139 0013-4651/2010/1582/A139/7/$28.00 © The Electrochemical Society Hydrothermal Synthesis of a Nanosized LiNi0.5Mn1.5O4 Cathode Material for High Power Lithium-Ion Batteries Xingkang Huang,a,b,z Qingshun Zhang,a Jianlong Gan,a Haitao Chang,a and Yong Yangb,*,z aFujian Nanping Nanfu Battery Company, Limited, Nanping 353000, China b State Key Laboratory for Physical Chemistry of Solid Surfaces and Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China A LiNi0.5Mn1.5O4 material for use as a 5 V spinel cathode for lithium-ion batteries was synthesized for the first time using a hydrothermal approach. The effects of the LiOH concentration and hydrothermal temperature on the hydrothermal products were investigated systematically, where the LiOH concentration e.g., 1.1 M was proven critical to successfully synthesize the 5 V spinel. At low LiOH concentrations e.g., 0.8–1.0 M, the obtained products may be MnOOH, -MnO2, and 4 V spinel, while high concentrations e.g., 1.8 M favor the Li2MnO3 phase. The particle size of the as-prepared 5 V spinel is ca. 30 nm, and its formation is associated with the dissolution-recrystallization mechanism from an amorphous precursor. Cell tests show that the as-prepared LiNi0.5Mn1.5O4 material obtained at 180°C exhibits a capacity of ca. 100 mAh g−1 at a cur