Preparation and Electrochemical Performance of High Rate Spherical Layered LiNi0.5Co0.2Mn0.3O2 Cathode Material for Lithium-Ion Batteries

doi:10.6023/A16110594

Acta Chim. Sinica ›› 2017, Vol. 75 ›› Issue (5): 501-507.DOI: 10.6023/A16110594 Previous Articles Next Articles

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高倍率球形锂离子电池正极材料LiNi_0.5Co_0.2Mn_0.3O₂的制备及其电化学性能研究

郑卓^a, 吴振国^b, 向伟^c, 郭孝东^b

a. 四川大学高分子研究所成都 610065;
b. 四川大学化学工程学院成都 610065;
c. 成都理工大学材料与化学化工学院成都 610065

投稿日期:2016-11-10 发布日期:2017-04-25
通讯作者: 郭孝东 E-mail:xiaodong2009@scu.edu.cn
基金资助:
项目受国家自然科学基金（No.21506133）资助.

Preparation and Electrochemical Performance of High Rate Spherical Layered LiNi_0.5Co_0.2Mn_0.3O₂ Cathode Material for Lithium-Ion Batteries

Zheng Zhuo^a, Wu Zhenguo^b, Xiang Wei^c, Guo Xiaodong^b

a. Polymer Research Institute, Sichuan University, Chengdu 610065;
b. School of Chemical Engineering, Sichuan University, Chengdu 610065;
c. College of Materials and Chemistry & Chemical Engineering, Chengdu University of Technology, Chengdu 610065

Received:2016-11-10 Published:2017-04-25
Contact: 10.6023/A16110594 E-mail:xiaodong2009@scu.edu.cn
Supported by:
Project supported by the National Natural Science Foundation of China (No. 21506133).

Layered Ni-rich compound LiNi_0.5Co_0.2Mn_0.3O₂ has drawn considerable attention recently because high Ni content contributes to the improvement of specific capacity and the reduction of cost. However, it is a challenge to obtain the Ni-rich LiNi_0.5Co_0.2Mn_0.3O₂ cathode with both high rate performance and high tap density because the rate capability is often improved at the expense of volumetric energy density, which is mostly dependent on the tap density. In our work, an uniform Ni-rich LiNi_0.5Co_0.2Mn_0.3O₂ microsphere with an average diameter of ca. 5 μm and tap density of 2.1 g·cm^-3 was successfully prepared using carbonate co-precipitation method, which can meet the commercial requirement for lithium-ion batteries (tap density≥2.1 g·cm^-3, Lithium Nickel Cobalt Manganese Oxides from CETC International Co., Ltd). In this synthetic route, the 2 mol·L^-1 mixture of NiSO₄·6H₂O, MnSO₄·H₂O and CoSO₄·7H₂O (Ni:Co:Mn=5:2:3, molar ratio) are the starting materials, 2 mol·L^-1 Na₂CO₃ and 4 mol·L^-1 NH₃·H₂O are the precipitant and chelating agent, respectively. In order to achieve high tap density, the stirring speed of continuous stirred tank reactor (CSTR) is as high as 1500 r/min, and the powder was preheated at 550 ℃ for 6 h and then calcined at 850 ℃ for 14 h in flowing oxygen. Powder X-ray diffraction (XRD) and transmission electron microscopy (TEM) results indicate that the microsphere LiNi_0.5Co_0.2Mn_0.3O₂ material has a well-ordered α-NaFeO₂ structure with stable in-plane [√3×√3]R30° ordering in the transition-metal layers. Electrochemical results also confirm that this cathode has excellent cycling stability and high rate capability. Specifically, it exhibits a discharge capacity of 150 mAh·g^-1 between 2.7 and 4.3 V at 1C after 100 cycles, with outstanding capacity retention of 94.6%. At 30C rate, it can still deliver a high discharge capacity of 96 mAh·g^-1. Meanwhile, the energy storage capacity for this cathode is also encouraging. At 0.1C rate, the specific energy (E_s) is 687.83 Wh·kg^-1 (volumetric energy density is 1444.45 Wh·L^-1); at 30C rate, the specific energy (E_s) is 335.27 Wh·kg^-1 (volumetric energy density is 704.07 Wh·L^-1). These excellent features will make this microsphere LiNi_0.5Co_0.2Mn_0.3O₂ material as a potential positive electrode material for commercial high energy density lithium-ion batteries.

Key words: lithium-ion battery, cathode material, carbonate co-precipitation method, LiNi_0.5Co_0.2Mn_0.3O₂, high rate performance

Cite this article

Zheng Zhuo, Wu Zhenguo, Xiang Wei, Guo Xiaodong. Preparation and Electrochemical Performance of High Rate Spherical Layered LiNi_0.5Co_0.2Mn_0.3O₂ Cathode Material for Lithium-Ion Batteries[J]. Acta Chim. Sinica, 2017, 75(5): 501-507.

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高倍率球形锂离子电池正极材料LiNi_0.5Co_0.2Mn_0.3O₂的制备及其电化学性能研究

Preparation and Electrochemical Performance of High Rate Spherical Layered LiNi_0.5Co_0.2Mn_0.3O₂ Cathode Material for Lithium-Ion Batteries

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高倍率球形锂离子电池正极材料LiNi0.5Co0.2Mn0.3O2的制备及其电化学性能研究