氢氧化锂是电池工业中的重要原料之一，传统的生产工艺面临高能耗的劣势。新工艺以硫酸锂盐为起始原料，可以通过使用离子交换膜的电解或电渗析过程进行氢氧化锂的制备。通过在小型3室电解和电渗析装置中进行的硫酸锂离子膜技术制备氢氧化锂过程，考察过程的能耗和电流效率。在常温下以硫酸锂溶液为原料进行3室电解，电流密度分别取700、1000、1400以及1800A/m2，循环流量40L/h，电解反应均可进行。在常温下以硫酸锂溶液为原料进行3室双极膜电渗析过程。电流密度250、500、750以及1000A/m2，循环流量20L/h下进行双极膜电渗析实验，过程平均电流效率均在70%以上。低电流密度有利于反应获得高效率。电流密度对电流效率和能耗的优化实验中，随着电流密度的增大，能耗也明显增大，在实验范围内，低电流密度有利于降低能耗。500A/m2是实验范围内最优的电流密度，综合考虑膜的成本与能耗进行优化计算，得到的最优电流密度为310A/m2。利用正交实验判断影响过程电流效率和能耗的4个条件参数对电流效率和能耗的影响，得到的最优初始条件： [H2SO4]=2.7mol/L，[LiOH]=1.0mol/L，[Li2SO4]=1.0mol/L，υ=30L/hr。以电流效率和能耗为判断的标准，对比双极膜电渗析过程两组膜堆的性能，在高电流密度下A2&C2比A1&C1能耗要更低。但250A/m2~500A/m2范围内，两组膜堆的效率与能耗相同。比较电解与电渗析过程的设备以及能耗，两种工艺反应器组件相同，双极膜的实际运行能耗远远低于电解过程，长期、大规模制备氢氧化锂，双极膜电渗析过程更有优势。

Lithium hydroxide is used in many chemical engineering processes. The traditional process of production of lithium hydroxide was in the inferior position because of the high energy consumption. A novel process of the production of lithium hydroxide could be carried out either by electrolysis or by bipolar electrodialysis process from lithium sulphate.A three-compartment electrolysis reactor involving cation-exchange membrane and anion-exchange membrane was designed to carry out the production of lithium hydroxide from lithium sulphate by both electrolysis and electrodialysis process. Energy consumption and current efficiency (CE) were researched in these processes.Lithium hydroxide production was carried out in both three-compartment electrolysis system and three-compartment bipolar electrodialysis system from lithium sulphate solution under room temperature. In the range of current density of 700~1800A/m2 and the circulation flow of 40L/h, the results showed that the electrolysis process was feasible. In the range of current density of 250~1000A/m2 and the circulation flow of 20L/h, the bipolar electrodialysis process was carried out with the average current efficiency over 70%. The results of preliminary experiment showed that in the range of these experiments, lower current densities contributed higher current efficiency.In the experiments of the optimization of current density, the energy consumption was increscent with current density. In the range of these experiments, lower current density contributed higher CE. The electrolysis process was carried out under different current densities. In the relative low current density, the experiment under 500A/m2 got the highest current efficiency and lowest energy consumption. If the expend of membranes was also taken into account of costing, the computation of optimization showed that 310A/m2 was the optimal current density. The orthogonal had been schemed to determine the influence of circulation flow rate, the initial concentrations of acid stream, base stream and salt stream on the process. The optimal reaction condition was under the initial concentration: 2.7mol/L of sulfuric acid, 1.0mol/L of lithium sulphate, 1.0mol/L of lithium hydroxide, 30L/h of the circulation flow.Comparisons were carried out between two suits of membrane stacks by CE and energy consumption. The A2&C2 membrane stack contributed lower energy consumption than A1&C1 membrane stack. But in the range of 250A/m2~500A/m2, the two suits of membrane stacks got the same CE and energy consumption.The electrolysis process was compared with the electrodialysis process by equipment costing and energy consumption. The running cost of bipolar electrodialysis process was extraordinarily lower than electrolysis process. The bipolar electrodialysis process was more compatible to industrialization of the production of lithium hydroxide.