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Journal of Electrochemistry ›› 2016, Vol. 22 ›› Issue (5): 528-534.

• Articles •

### Continuous Synthesis and Condition Exploration of Precursor Ni1/3Co1/3Mn1/3(OH)2 Ternary Cathode Material

JIANG Zhi-jun 1,2, ZHANG Ya-li 3*, WANG Qian 1,2, ZHANG Hui 1,2

1. 1. Zibo Guoli New Power Source technology Co., Ltd., Zibo, Shandong 255086, China; 2. Zibo Engineering Technology Research Center of Asymmetric Large Power Capacitor Battery, Zibo, Shandong 255086, China; 3. College of Chemical Engineering，Shandong University Of Technology , Zibo, Shandong 255086, China
• Received:2015-11-29 Revised:2015-12-30 Online:2016-10-28 Published:2016-01-06
• Contact: ZHANG Ya-li E-mail:zhangyl0419@163.com

Abstract:

Commercial LiNi1/3Co1/3Mn1/3(OH)2 ternary material is generally prepared by a combination of co-precipitation and solid state reaction method. The particle size distribution and morphology of Ni1/3Co1/3Mn1/3(OH)2 precursor have a great impact on the electrochemical performance of LiNi1/3Co1/3Mn1/3O2. In this work, the precursor Ni1/3Co1/3Mn1/3(OH)2 ternary cathode material was prepared by co-precipitation method with MnSO4, NiSO4, and CoSO4 as raw materials, NaOH as a precipitating agent and NH3•H2O as a complexing agent through continuous stirred-tank reactor series (CSTRs). The effects of stirring speed on the morphology of the nuclear particles, flow quantities of crystal nuclei and ammonia, slurry regurgitation, agitator blade structure on the morphology, crystalline structure, particle size and particle size distribution of the precursor were explored. Physical characterization results showed that the primary particles of the crystal nucleus agglomerate formed secondary particles with the particle size of 4 ~ 5 μm, and the well distributed particles were near spherical at the stirring rate of 300 r·min-1. When the pusher type agitator was used, the flow quantities of crystal nucleation and crystal growth metal liquids were 0.4  L•h-1 and 1.72  L•h-1, respectively, the product exhibited a single phase of β-Ni(OH)2 with a layered structure. The particle size (D50) of 6 ~ 7 μm, the tap density of ≥ 2.0 g•cm-3, and the BET surface area of 6 ~ 10 m2•g-1,were also obtained. The electrochemical test results revealed that the initial discharge capacity of LiNi1/3Co1/3Mn1/3O2 reached 149.7 mAh•g-1 and the capacity retention was 94.09% after 100 cycles in the voltage range of 3.0 ~ 4.25 V at 0.2 C. The product could meet demands of high-end ternary cathode material manufacturers. The CSTRs method is simple, effective and applicable. Therefore, it can be potentially used for a large scale preparation of ternary material precursors.

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