Performance enhancement of hollow-structured H2TiO3 lithium ion sieve induced by Nb doping modification: High structural stability and superior adsorption capability - Nai-Cai Xu; Jing Liu; Dan-Dan Shi; Yi-Ying Wang; Jian-Long Zheng; Cai-Ying Zhao; Kai-Peng Zhong; Jia-Jia Cao; Shao-Ju Bian (Hydrometallurgy, 2026)