46results about How to "Good fast charge and discharge capability" patented technology

The invention relates to titanium acid lithium battery cathode material containing rare metal elements, which comprises a synthesized lithium titanate material. A or a plurality of rare metal elements are contained in the lithium titanate material; the rare metal elements adopt Zr, Al, La, Ce, Pr, Nd, Sm and Dy or Ho; the contents of the rare metal elements are 0.01-3 wt percent by oxidate; the lithium and titanium molar ratio in the lithium titanate material is 0.7-1.2; and the titanium acid lithium battery cathode material is produced by adopting the processes of material mixing, ball milling and sieving, high-temperature treatment, secondary ball milling, high-temperature heat preservation and the like. The titanium acid lithium battery cathode material containing the rare metal elements is doped with the rare metal elements, improves the quick charging and discharging properties, improves the electrochemical capacity and has excellent cycle performance, good repeatability and high consistency; and furthermore, the titanium acid lithium battery cathode material has the advantages of low raw material cost, short synthesis time, low temperature, low requirements for equipment and simple manufacturing process and is suitable for industrial scale production.

The invention relates to a composite conductive paste, a preparation method and use thereof. The composite conductive paste of the invention comprises a composite material composed of a carbon nanotube and grapheme. The grapheme is less-layer graphene (10-20 layers), and the carbon nanotube is a multi-walled carbon nanotube. The composite conductive paste solves the problem that the two nanomaterials including the carbon nanotube and the graphene are difficult to disperse. The prepared composite conductive paste has good electrical conductivity and a resistivity of 32[omega].cm to 35[omega].cm. An electrode pole piece prepared from the composite conductive paste of the invention has high electrical conductivity, can improve the electrical conductivity and the electrochemical performance ofthe whole battery. An assembled battery has good fast charge and discharge performance, good reversibility and stability.

The invention provides a micro-mesoporous polytriphenylamine derivative applied to a lithium battery, as well as a preparation method thereof, relates to a lithium ion battery material and a preparation method thereof, and discloses a micro-mesoporous structured polytriphenylamine derivative with high free radical density, an application thereof and a lithium battery prepared from the polytriphenylamine derivative. The micro-mesoporous structured polytriphenylamine derivative is prepared by taking 4,4',4'-tris(N,N-diphenylamino)triphenylamine as a monomer by virtue of a chemical oxidative polymerization method. Such a polytriphenylamine derivative material is of a micro-mesoporous structure and fiber morphology, is used as a lithium ion battery cathode material, and has high charge and discharge performance, cyclic stability and rate performance.

The invention provides a preparation method of a lithium battery high-voltage modified cathode material. A lithium battery made of the cathode material can be charged and discharged rapidly; the charging cut-off voltage is raised to 4.35V; and the energy density of the battery is greatly increased. In the cathode material prepared with the method, graphite is taken as a core, the surface of the graphite is uniformly coated with a layer of lithium titanate, and the surfaces of graphite particles coated with the lithium titanate are coated with a layer of conductive agent, thereby forming a graphite-lithium tianate-conductive agent three-layer composite structure. The obtained battery has high rapid charging-discharging performance, and the low-temperature performance is improved greatly. Meanwhile, the safety performance is improved greatly.

The invention provides a linear hierarchy lithium titanate material, as well as preparation and application thereof. The lithium titanate material has a spinel crystal phase, or a monoclinic crystal phase or a composite crystal phase of spinel and monoclinic crystal phases, wherein the lithium titanate material is mainly formed by a linear hierarchy structure which has a draw ratio of more than 10; and the surface of the lithium titanate material with the linear hierarchy structure is formed by nanosheets. According to the linear hierarchy lithium titanate material, the long axis of the linearstructure is favorable to effective mobility of electrons, the flaky hierarchy structure is favorable to the process of quickly embedding in and out lithium ions, sodium ions or potassium ions, a large specific surface area is favorable to the contact area of electrolyte and electrode, the current density is reduced, and the material has relatively good battery quick charge and discharge performance.

According to one embodiment, there is provided an active material. The active material contains a composite oxide represented by the following general: a general formula Lix(Nb1−yTay)2+0.5zTi1−zM0.5zO7 (0≰x≰5, 0≰y≰1, and 0<z≰1). In this formula, M is at least one metal element selected from the group consisting of Sc, Y, V, Cr, Fe, Co, Mn, Al, and Ga.

According to one embodiment, an active material for batteries is provided. The active material for batteries comprises a composite oxide represented by the general formula: Lix(Nb1-yTay)2-zTi1+0.5zM0.5zO7. In the formula, 0<=x<=5, 0<=y<=1, 0<z<=1, and M represents at least one metal element selected from the group consisting of Mo and W.