Topic
Lithium titanate
About: Lithium titanate is a research topic. Over the lifetime, 2799 publications have been published within this topic receiving 37301 citations. The topic is also known as: LTO.
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TL;DR: In this paper, a defect spinel-framework structure was examined in nonaqueous lithium cells and it was shown that the lattice dimension did not change during the reaction since the reaction consists of lithium ion and electron insertion into/extraction from the solid matrix without a noticeable change in lattice dimensions.
Abstract: having a defect spinel‐framework structure was prepared and examined in non‐aqueous lithium cells. (white in color) was reduced to (dark blue) at a voltage of 1.55 V and the reaction was highly reversible. X‐ray diffraction measurements indicated that the lattice dimension did not change during the reactionSince the reaction consists of lithium ion and electron insertion into/extraction from the solid matrix without a noticeable change in lattice dimension, called a zero‐strain insertion reaction, capacity failure due to the damage to the solid matrix was not observed even after 100 cycles. Feasibility of zero‐strain insertion materials for advanced batteries is discussed based on the experimental results.
1,779 citations
TL;DR: In this paper, Li3xLa(2/3)-x□(1/3)2xTiO3 (0 < x < 0.16) and its related structure materials, the x ≈ 0.1 member exhibits conductivity of 1 × 10-3 S/cm at room temperature with an activation energy of 0.40 eV.
Abstract: To date, the highest bulk lithium ion-conducting solid electrolyte is the perovskite (ABO3)-type lithium lanthanum titanate (LLT) Li3xLa(2/3)-x□(1/3)-2xTiO3 (0 < x < 0.16) and its related structure materials. The x ≈ 0.1 member exhibits conductivity of 1 × 10-3 S/cm at room temperature with an activation energy of 0.40 eV. The conductivity is comparable to that of commonly used polymer/liquid electrolytes. The ionic conductivity of LLT mainly depends on the size of the A-site ion cation (e.g., La or rare earth, alkali or alkaline earth), lithium and vacancy concentration, and the nature of the B−O bond. For example, replacement of La by other rare earth elements with smaller ionic radii than that of La decreases the lithium ion conductivity, while partial substitution of La by Sr (larger ionic radii than that of La) slightly increases the lithium ion conductivity. The high lithium ion conductivity of LLT is considered to be due to the large concentration of A-site vacancies, and the motion of lithium by a...
703 citations
Patent•
07 Jan 1998TL;DR: A lithium secondary battery provided with an anode containing lithium titanate as an active material, cathode containing a carbon material as active material and electrolyte prepared by dissolving a lithium salt in an organic solvent is described in this paper.
Abstract: A lithium secondary battery provided with an anode containing lithium titanate as an active material, cathode containing a carbon material as an active material, and electrolyte prepared by dissolving a lithium salt in an organic solvent It is preferable to use a lithium titanate having a composition expressed by the generalized formula of Lix Tiy O4 (08≤x≤14 and 16≤y≤22) The lithium secondary battery having a rated voltage of 15 V has a high capacity and excellent charging/discharging cycle characteristics suitable for power sources of wrist watches, etc
364 citations
TL;DR: In this paper, the entropy changes in various cathode and anode materials, as well as in complete Li-ion batteries, were measured using an electrochemical thermodynamic measurement system (ETMS).
323 citations
TL;DR: In this article, the free volume for lithium ions to migrate, and the lithium and vacancy concentrations on the A-site play important roles for the ionic conductivity in the perovskite structure.
301 citations