首页>
外国专利>
LITHIUM TITANATE PARTICULATE POWDER AND PRODUCTION METHOD FOR SAME, MG-CONTAINING LITHIUM TITANATE PARTICULATE POWDER AND PRODUCTION METHOD FOR SAME, NEGATIVE ELECTRODE ACTIVE MATERIAL PARTICULATE POWDER FOR NON-AQUEOUS ELECTROLYTE SECONDARY BATTERY, AND NON-AQUEOUS ELECTROLYTE SECONDARY BATTERY
LITHIUM TITANATE PARTICULATE POWDER AND PRODUCTION METHOD FOR SAME, MG-CONTAINING LITHIUM TITANATE PARTICULATE POWDER AND PRODUCTION METHOD FOR SAME, NEGATIVE ELECTRODE ACTIVE MATERIAL PARTICULATE POWDER FOR NON-AQUEOUS ELECTROLYTE SECONDARY BATTERY, AND NON-AQUEOUS ELECTROLYTE SECONDARY BATTERY
According to the present invention, there are provided lithium titanate particles which exhibit an excellent initial discharge capacity and an enhanced high-efficiency discharge capacity retention rate as an active substance for non-aqueous electrolyte secondary batteries and a process for producing the lithium titanate particles, and Mg-containing lithium titanate particles. The present invention relates to lithium titanate particles with a spinel structure comprising TiO2 in an amount of not more than 1.5%, Li2TiO3 in an amount of not less than 1% and not more than 6%, and Li4Ti5O12 in an amount of not less than 94% and not more than 99% as determined according to Rietveld analysis when indexed with Fd-3m by XRD, and having a specific surface area of 7 to 15 m2/g as measured by BET method, a process for producing lithium titanate particles comprising the steps of adding and mixing a water-soluble lithium solution into a water suspension of an oxide of titanium having a BET specific surface area of 40 to 400 m2/g and a primary particle diameter of 5 to 50 nm and subjecting the resulting mixed suspension to aging reaction at a temperature of 50 to 100°C; subjecting the resulting reaction product to filtration, drying and pulverization; and subjecting the obtained dry particles to heat-calcination treatment at a temperature of 550 to 800°C, and Mg-containing lithium titanate particles having a composition represented by the formula: LixMgyTizO4 wherein x, z 0; 0.01 ≤ y ≤ 0.20; 0.01 ≤ y/z ≤ 0.10; and 0.5 ≤ (x + y)/z ≤ 1.0, the Mg-containing lithium titanate particles having a BET specific surface area of 5 to 50 m2/g, a spinel single phase as a crystal structure, and a lattice constant (a) represented by a value of 0.050y + 8.3595 a ≤ 0.080y + 8.3595 (Å).
展开▼
机译：根据本发明，提供了钛酸锂颗粒和其制备方法，所述钛酸锂颗粒作为非水电解质二次电池的活性物质具有优异的初始放电容量和提高的高效放电容量保持率。含镁的钛酸锂颗粒。本发明涉及具有尖晶石结构的钛酸锂颗粒，其包含不大于1.5％的TiO 2，不小于1％且不大于6％的Li 2 TiO 3和不小于1％的Li 4 Ti 5 O 12。根据Rietveld分析，当通过XRD对Fd-3m进行分度时，根据Rietveld分析所测定的，且具有通过BET法测量的比表面积为7至15m2 / g的方法，所述钛酸锂颗粒的制备方法包括：将水溶性锂溶液加入并混合到BET比表面积为40至400 m2 / g，一次粒径为5至50 nm的钛氧化物的水悬浮液中并进行混合的步骤在50至100℃的温度下进行老化反应;使所得反应产物过滤，干燥和粉碎;然后，将得到的干燥粒子在550〜800℃的温度下进行加热煅烧处理，组成为以下式的Li x MgyTizO 4，其中x，z＞ 0。 0.01≤y≤0.20; 0.01≤y / z≤0.10; 0.5≤（x + y）/z≤1.0，且BET比表面积为5〜50m2 / g，尖晶石单相为晶体结构，晶格常数为（a）的含Mg钛酸锂颗粒。表示为0.050y + 8.3595 展开▼
