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 Posted: Sun 12:31, 16 Jan 2011 Post subject: moncler daunenjacke High-capacity high-density nic |
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High-capacity high-density nickel hydroxide preparation
Animal pole material Ni (OH) 2, we must have a high discharge capacity, but also has a high packing density, so the two must be taken into account. Since dropping the same process to maintain base flows, changes in the flow of nickel sulfate to ensure the reaction pH, so. With the pH value increases, the drops added to the solution reduced NiS Qiu, supersaturation was reduced, Ni (OH), crystal growth slows, there is enough time to adjust, so that regular lattice arrangement, fewer defects to improve the density, so that the crystal than the pH value of hours is more dense, increasing the average particle size, surface area reduction of the discharge capacity decreased, while the packing density increases. Easy to form transition metal hydroxides, colloidal, Ni (OH) 2 is no exception, in the preparation process can easily generate colloidal (OH). Colloid (OH>,[link widoczny dla zalogowanych], once formed, the morphology, purity, bulk density, discharge capacity and other technical indicators can not be guaranteed, and to avoid colloidal Ni (OH) the solution must be strictly controlled pH value of 2.. Temperature of Ni {OH), the performance of reaction temperature on the M (OH), the discharge capacity and the impact of bulk density as shown in Figure 2. Figure 2 shows that,[link widoczny dla zalogowanych], with the reaction temperature, Ni (OH) of the discharge capacity increases, the packing density decreases,[link widoczny dla zalogowanych], a combination of both choice reaction temperature is between 5O ~ 65 ℃ supersaturated solution crystallization process is driving force, reaction temperature, the supersaturation was reduced, while inhibiting the nucleation and crystal growth. Since crystallization is an exothermic process, crystal growth will prevent the release of heat further grow. Figure 2 Temperature rise very Kun Ni (OH): Shao-frog to the properties of the crystal can make the new solution from the original crystal surface, relatively speaking, because no direct contact between the crystals, the heat released during crystallization is relatively small, Thus the packing density is low, on the other hand, temperature, ionic crystals, especially near the surface of non-ferrous metal ion movement in Xinjiang in 2000 accelerated the growth rate of small grains increases, the crystal surface is not fully developed, the lattice arrangement is not regular, the complete deterioration of the crystal shape, lattice defects, thus obtained crystal surface area, high discharge capacity. 3, ammonia addition on Ni (OH】 properties of ammonia added benefit of a crystal of nickel hydroxide, the reaction will be concentrated ammonia in proportion to the preparation of the NaOtt lye, pH value of 100, the temperature to 6O ℃,[link widoczny dla zalogowanych], the sample drying temperature of 120 ℃. ammonia and alkali different volume ratio of Ni (OH) packing density as shown in Figure 3. myeloid Rights NH】 {%) Figure 3, the amount of ammonia added to the Ni (OH) performance The figure shows the impact of a certain range, with the increase of the amount of ammonia added, Ni (OH), the packing density increased, and N, (OH) 2 crystal morphology made of amorphous spherical shape becoming, as well as spherical, but when excessive ammonia added, the packing density and morphology have been no significant increase in the rate of bulk density becomes smaller and tends to zero, In addition, the ammonia by adding chlorine gas leak had caused the General Assembly, the working environment Therefore,[link widoczny dla zalogowanych], the optional addition of chlorine is 15% ~ 2O% (volume ratio) when the alkaline solution without ammonia, N, and OH a direct response to that produced ten 2oH N one by one N (OH), ÷ (1) the time when adding ammonia, Ni and Cr ions before the formation of nickel-ammonia N; + nNHs + (6 A n) H2O a [Ni (NH3) (H2o) I] (2) and then reacts with the alkaline nickel hydroxide: [ ,],[Equation (3), compared to the situation without ammonia, Ni (OH) 2 formation rate slows, the crystal growth rate slows down, so dense crystalline arrangement of the body, regular, Ni (OH) 2 bulk density becomes larger, morphology intact. IV, Conclusion 1 nickel solution and ammonia solution was added to the reactor base prepared Ni (OH)! The results showed that: the pH value of reaction, the reaction temperature by adding the amount of ammonia and drying temperature of Ni (OH) 2 discharge capacity and the accumulation of density of the main factors. 2. In order to obtain high-power ratio of capacity, high packing density of spherical Ni (OH) 2, the reaction process conditions pH = 10.5 ~ I1.5, reaction temperature 50 - 60 ~, ammonia volume ratio is 15% 2O%, drying temperature of 12O ℃. References [1], longevity, etc. Cuan hydroxide and nickel hydroxide, revolves resultant panels battery [2] Liu Changshou. Nickel oxide and other reactive oxygen morphology and structure of the packing density [3: Chuanjin Shinji. Yamauchi also the Japanese public license Qiao P level 06340427.1994 Received communique】 :2000 -06-24
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