Lithium extraction from high Mg/Li brine is a key technical problem around the world. Based on the principle of rocking-chair Lithium-Ion Batteries, cathode material LiMn₂O₄ is applied to extract lithium from brine, and a novel lithium-ion battery system of “LiMn₂O₄ (anode)|supporting electrolyte|anionic membrane|brine|Li_1−xMn₂O₄ (cathode, 0<x<1)” is constructed. Gratifyingly, this system has strong adaptability for different brines. Concretely, for treating a low Li⁺ brine, the Mg/Li declined from 147.8 in brine to 0.37 in obtained anolyte and the Li⁺ in anolyte concentrated to 1.2 g·L⁻¹. For treating a high Li⁺ brine, the Mg/Li ratio decreased from the initial 58.8 in brine to 1.7 in obtained anolyte, the rejection rate of other impurities such as Mg²⁺, SO₄²⁻ and B₂O₃ exceeded 97.8% and the Li⁺ recovery in brine could reach 83.3%. Furthermore, the dissolution rate of manganese per cycle is <0.077% and the intercalation capacity maintained 91% of the initial intercalation capacity after 100 cycles. Therefore, the electrochemical separation system introduced a new perspective for the lithium industry, which shows a high selectivity of lithium, great stability environmentally friendly.

从高Mg / Li盐水中提取锂是世界范围内的关键技术问题。基于摇椅锂离子电池的原理，应用正极材料LiMn ₂ O ₄从盐水中提取锂，新型锂离子电池系统“ LiMn ₂ O ₄（阳极）|支撑电解质膜” | brine | Li _{1 - x} Mn ₂ O ₄（阴极，0 < x <1）”构成。令人欣慰的是，该系统对不同盐水具有很强的适应性。具体而言，对于处理低含量的Li ⁺盐水，Mg / Li从盐水中的147.8降至所得到的阳极液中的0.37，而Li ⁺在阳极电解液中浓缩至1.2g·L ^-1。为了处理高含量的Li ⁺盐水，Mg / Li比从盐水中的初始58.8降低到所得阳极电解液中的1.7，其他杂质如Mg 2 ⁺，SO ₄ ^2-和B ₂ O ₃的排斥率超过97.8％。盐水中的Li ⁺回收率可达到83.3％。此外，每循环锰的溶解率＜0.077％，并且在100次循环后插层容量保持了初始插层容量的91％。因此，电化学分离系统为锂工业引入了新的视角，显示了锂的高选择性，对环境的极大稳定性。