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High density of active nickel hydroxide


Not structured, the integrity of the crystal variation, lattice defects,[link widoczny dla zalogowanych], the crystal thus obtained a large surface area, high discharge capacity. Test that the optimum temperature should be controlled in 30 ~ 80 ~ C in a fixed value, usually set by the value of ± 2 ~ C range. Stirring intensity 4.3 on the Ni (OH) of Ni (OH) particle size and stirring intensity, when the mixing device is fixed, with the mixing intensity increased, the resulting Ni (OH) particles smaller. Reaction concentration of 4.4 Table 3 and Table 4, sample A compared with C sample shows the time when other conditions are the same, C the sample concentration is low,[link widoczny dla zalogowanych], and the bulk of their products were lower than the A sample real shake , specific surface area smaller than the effective capacity of Xinjiang Nonferrous Metals 2003, 27 low. 4.5 Influence of ammonia complexing agent ammonia alkaline solution without the time or does not exist NH4, Ni and OH a direct response: N +20 H eleven Ni (OH) (1) When the alkaline solution by adding ammonia, Ni and NH before the formation of ammonium ion: Ni + nNH3 + (b A 13) H20 a [Ni (NH) (H: 0) I] (2) and then reacts with the nickel hydroxide NaOH. [Ni (NH3) (H20) 6 a] ¨ +20 H eleven Ni (OH) 2 + nNH3 + (6 A n) H20 (3) the addition of ammonia to produce Ni (OH) of the reaction is (3) and compared to the situation without ammonia, Ni (OH): the formation of slow crystal growth rate slows down, the column density and thus the discharge of the crystal, the neat. Ni (OH): larger bulk density, morphology intact. Reaction, the rate of 25% ammonia added to the reaction by some synthesizer, in a certain range, with the addition of ammonia increases, the product packing density increased, but improved reaction system pH, the Ni (OH ): the activity decreased, Ni (OH) particles larger. At the same time adverse impact on the working environment. Should choose the amount of ammonia was added 15% to 25% (volume ratio). 4.6 feed speed of the feed rate also affects the fast and slow Ni (OH): The physical properties, the most obvious is the impact on density. 510152025t (h) Figure 3 Relationship between residence time and density of which: A density curve is shaking; B curve for the bulk density. It can be seen from Figure 3, retention time 10 ~ 24h, the density higher than shake 2.00g/cm. Reaction Synthesis specific surface area in the drainage tube is also affected. From Table 1 and Table 3 can be seen, A and B samples of the other conditions the same, but no drainage tube B, the specific surface area less than the A samples. 5 Conclusion 5.1 The use of chemical crystallization method used to meet the cell materials of spherical nickel hydroxide, as long as the strict control of reaction conditions, it is entirely possible. 5.2 Process conditions: pH value should be controlled at 9 ~ 13.5; reaction temperature of 30 ~ 80 ℃; ammonia addition of 15% to 25%, retention time 10 ~ 24h, a certain degree of mixing intensity. 5.3 The pilot experiment, to obtain large quantities of quality and stability of the system of qualified products, the need to further expand the test to verify the process conditions. References [1] Fanxiang Qing, et al. High performance Ni (OH) Preparation and electrode properties. Battery. 1995.25 (2) [2] He Wanning, et al. High-density spherical Ni (OH) in the process development studies. Power. 1995. (5) [3] Sun Yang, et al. High-capacity high-density nickel hydroxide preparation. Chemical Metallurgy. 1997.18 (4) [4] JIANG Chang-yin, et al. High density spherical nickel hydroxide active preparation and performance control. Power. 1997.21 (6) [5] and then the house of the king. High activity of high density nickel hydroxide production technology. Battery. 1998.28 (2) [6] Li Rong. Nickel hydroxide physical and electrochemical properties. Battery. 1998.28 (2) [7] Liu Changshou,[link widoczny dla zalogowanych], et al. High density and high activity of nickel hydroxide. Chemical Science. 1994.11. [8] Ren Xiaohua, et al. Some impurities in the form of spherical nickel hydroxide and electrical properties. Power. 1998.22 (1) 【9] Zhang translation. Preparation of crystalline Ni (OH) powder. Physical Chemistry Chemical and Industrial Electric (in Japanese). 1995.63 (. 252 ~ 8,[link widoczny dla zalogowanych],96.10 (10] Zhang translation, alkaline batteries Preparation of nickel electrodes. Communique public license,[link widoczny dla zalogowanych], flat 1 187765,1998 【11 months in l1] Zhao governance, Yang Shuting, in the legislature. Henan Normal University . invention apply for a public statement [11]. Open Road. CN1075697A Received :2003-01 -082 109 872 211 a E. / B)

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