| Summary: | The advantages of new types of H<sub>2</sub>TiO<sub>3</sub> lithium-ion sieves, including excellent adsorption performance, high-efficiency Li<sup>+</sup>-ion selectivity, reliable regeneration, environmental friendliness, and easy preparation, have attracted considerable attention. Currently, the prices of lithium carbonate and other related products are rapidly increasing, so the use of H<sub>2</sub>TiO<sub>3</sub> lithium-ion sieves to extract lithium resources in salt lake brine has become a crucial strategy. H<sub>2</sub>TiO<sub>3</sub> lithium-ion sieve is a layered double hydroxide with a 3<i>R<sub>1</sub></i> sequence to arrange oxygen layers. Its adsorption mechanism involves the breaking of surface O-H bonds and the formation of O-Li bonds. This study provides a theoretical basis for developing high-efficiency lithium-ion sieves. This article also summarizes the influencing factors for the synthesis process of H<sub>2</sub>TiO<sub>3</sub>, which can seriously influence the adsorption performance, and offers experimental verification for the preparation of H<sub>2</sub>TiO<sub>3</sub> lithium-ion sieves. H<sub>2</sub>TiO<sub>3</sub> lithium-ion sieves prepared from anatase using a reasonable method show the largest adsorption capacity. In addition, effective ways to recycle H<sub>2</sub>TiO<sub>3</sub> are outlined, which provide a guarantee for its industrial application. Finally, this paper summarizes the full text and points out future research directions for H<sub>2</sub>TiO<sub>3</sub> lithium-ion sieves.
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