Synthesis of nickel-cobalt hydroxide composites as supercapacitor materials by micro-impinging stream reactors and their performance study

doi:10.11949/0438-1157.20220593

Abstract

Abstract:

Nickel-cobalt composite supercapacitor electrode materials such as nickel-cobalt hydroxide composites have attracted extensive attention in the field of electrochemistry due to their advantages of large specific capacitance and excellent cycle performance. The electrochemical properties of nickel-cobalt composites are generally better than those of single transition metal compounds due to the synergic interaction between the transition metal elements. However, the performance of metal composites is closely related to the component element distribution within the particles, which depends strongly on the micromixing efficiency of the precipitation reaction environment. In this work, a micro-impinging stream reactor (MISR) with excellent micromixing performance was applied to the preparation of nickel-cobalt hydroxide composites. The results showed that MISR could significantly reduce the particle scale and improve the size distribution, agglomeration degree as well as the electrochemical performance of the prepared nickel-cobalt hydroxide composites. In the three-electrode testing system, the initial specific capacitance of the MISR-prepared material was 1548.0 F/g, and the capacitance retention was 106.0% after 1000 charge-discharge cycles. In the two-electrode system, the initial specific capacitance of the device was 30.6 F/g, and the capacitance retention was 75.6% after 1000 cycles.

Key words: microreactor, precipitation, composites, supercapacitor, size distribution

摘要：

镍基复合超级电容器电极材料如镍钴复合氢氧化物，由于其比电容大、循环性能好等优点受到了电化学界的广泛关注。相比于纯Ni(OH)₂，镍钴复合氢氧化物材料由于过渡金属元素之间的协同作用，其电化学性能一般会更佳。但是镍钴复合氢氧化物材料的性能与其颗粒内部的组分分布均匀性有很大关联，而组分分布又依赖于沉淀反应时反应器内的微观混合均匀程度。将微观混合性能优良的微撞击流反应器（MISR）应用于镍钴复合氢氧化物材料的共沉淀制备，结果表明MISR能够显著改善镍钴复合氢氧化物材料的颗粒粒径、尺寸分布、团聚程度以及电化学性能：三电极体系测试下，所制备材料的初始比电容为1548.0 F/g，1000圈充放电循环后电容保持率为106.0%；二电极体系测试下，器件的初始比电容为30.6 F/g，1000圈循环后电容保持率为75.6%。

关键词: 微反应器, 沉淀, 复合材料, 超级电容器, 粒度分布

CLC Number:

Renjie GU, Jiawei ZHANG, Xueyang JIN, Lixiong WEN. Synthesis of nickel-cobalt hydroxide composites as supercapacitor materials by micro-impinging stream reactors and their performance study[J]. CIESC Journal, 2022, 73(8): 3749-3757.

顾仁杰, 张加威, 靳雪阳, 文利雄. 微撞击流反应器制备镍钴复合氢氧化物超级电容器材料及其性能研究[J]. 化工学报, 2022, 73(8): 3749-3757.

Figures/Tables 13

Fig.1 Experimental device

Fig.2 Two-electrode test system

Fig.3 XRD patterns of nickel-cobalt hydroxide composites

Fig.4 SEM images of nickel-cobalt hydroxide composites

Fig.5 XPS spectra of materials prepared in MISR

Fig.6 Global element distribution of materials prepared in MISR

Fig.7 Local element distribution of materials prepared in MISR

Table 1 Element distributions of materials prepared in MISR

元素	原子百分比/%
元素	整体	Line 1	Line 2	Line 3	Line 4	Line 5
Ni	25.96	24.70	31.88	33.10	24.06	24.22
Co	8.87	8.32	10.26	10.76	7.71	7.99
O	65.17	66.98	57.86	56.14	68.22	67.79

Fig.8 TEM and EDS images of materials prepared in MISR

Fig.9 N2 absorption/desorption isotherms of materials prepared in MISR(insert is pore size distributions)

Fig.10 Electrochemical properties of nickel-cobalt hydroxide composites

Fig.11 Two-electrode test results

Fig.12 Ragone plot of the device

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