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Preparation of Li4Ti5O12 Microspheres with a Pure Cr2O3 Coating Layer and its Effect for Lithium Storage
Hai-lin Zou1, Xin Liang1, Zhong-hui Wang1, Sheng Cheng2, Hong-fa Xiang1
1.School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, China;2.Instrumental Analysis Center, Hefei University of Technology, Hefei 230009, China
Abstract:
The pure Cr2O3 coated Li4Ti5O12 microspheres were prepared by a facile and cheap solutionbased method with basic chromium(III) nitrate solution (pH=11.9). And their Li-storage properties were investigated as anode materials for lithium rechargeable batteries. The pure Cr2O3 works as an adhesive interface to strengthen the connections between Li4Ti5O12 particles, providing more electric conduction channels, and reduce the inter-particle resistance. Moreover, LixCr2O3, formed by the lithiation of Cr2O3, can further stabilize Li7Ti5O12 with high electric conductivity on the surface of particles. While in the acid chromium solution (pH=3.2) modification, besides Cr2O3, Li2CrO4 and TiO2 phases were also found in the final product. Li2CrO4 is toxic and the presence of TiO2 is not welcome to improve the electrochemical performance of Li4Ti5O12 microspheres. The reversible capacity of 1% Cr2O3-coated sample with the basic chromium solution modification was 180 mAh/g at 0.1 C, and 134 mAh/g at 10 C. Moreover, it was even as high as 127 mAh/g at 5 C after 600 cycles. At-20℃, its reversible specific capacity was still as high as 118 mAh/g.
Key words:  Li4Ti5O12  Cr2O3  Lithium-ion battery  Solution-based method
FundProject:This work was supported by the National Natural Science Foundation of China (No.51372060 and No.31501576).
纯Cr2O3包覆Li4Ti5O12微球的制备及其储锂性能研究
邹海林1, 梁鑫1, 王中会1, 程盛2, 项宏发1
1.合肥工业大学材料科学与工程学院, 合肥 230009;2.合肥工业大学分析测试中心, 合肥 230009
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DOI:10.1063/1674-0068/30/cjcp1607152
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