1068results about How to "Good reversibility" patented technology

A positive active material for lithium secondary batteries, includes a composite oxide including an oxide which is represented by the composite formula Li_xMn_aNi_bCo_cO₂ and has an α-NaFeO₂ structure, and an impurity phase including Li₂MnO₃. The values a, b, and c are within such a range that in a ternary phase diagram showing the relationship among these, (a, b, c) is present on the perimeter of or inside the quadrilateral ABCD defined by point A (0.5, 0.5, 0), point B (0.55, 0.45, 0), point C (0.55, 0.15, 0.30), and point D (0.15, 0.15, 0.7) as vertexes, and 0.95<x/(a+b+c)<1.35.

A secondary battery is equipped with a reaction container and a current collector that is built in at least one of a positive electrode side and a negative electrode side. The positive electrode side and the negative electrode side are separated from each other by an ion conductive separator. In the reaction container, an organic matter excluding a metal complex and a radical and capable of reversibly being electrochemically oxidized and reduced is used as an active material together with a supporting salt. The active material and the supporting salt form a liquid. On the surface of the current collector, the active material contained in the liquid is charged and discharged.

Because of the composition represented by General Formula: Li1+x+alphaNi(1-x-y+delta)/2Mn(1-x-y-delta)/2MyO2 (where 0<=x<=0.05, -0.05<=x+alpha<=0.05, 0<=y<=0.4; -0.1<=delta<=0.1 (when 0<=y<=0.2) or -0.24<=delta<=0.24 (when 0.2<=y<=0.4); and M is at least one element selected from the group consisting of Ti, Cr, Fe, Co, Cu, Zn, Al, Ge and Sn), a high-density lithium-containing complex oxide with high stability of a layered crystal structure and excellent reversibility of charging/discharging can be provided, and a high-capacity non-aqueous secondary battery excellent in durability is realized by using such an oxide for a positive electrode.

The present invention provides a pH sensing apparatus that includes a flexible polymer substrate, one or more amorphous iridium oxide film sensor electrodes disposed on the flexible polymer substrate, and a reference electrode corresponding to each amorphous iridium oxide film sensor electrode. Each reference electrode is disposed on the flexible polymer substrate in close proximity to the corresponding amorphous iridium oxide film sensor electrode. The amorphous iridium oxide film sensor electrodes provide a potential in reference to the reference electrodes that varies according to a pH of a substance contacting the amorphous iridium oxide film sensor electrodes and the reference electrodes.

The invention provides a composite phase-change thermal storage material. A porous material with high thermal conductivity is used as a supporting framework, and low-melting-point metal or low-melting-point metal with nano-particles is distributed in pores of the porous material, wherein melting point or solidus temperature of the low-melting-point metal is less than or equal to 80 DEG C; and thermal conductivity of the porous material is within 40-400 W/(m.K). The material provided by the invention has high equivalent thermal conductivity and high storage energy density; there is a large contact area between the liquid metal and the porous material; and the material has a wide application temperature range, has good fixability, stable physico-chemical property and good reversibility; and the problem of decreasing heat storage efficiency after multiple times of heat adsorption and release cycles is avoided.

The invention belongs to the technical field of semiconductor oxide gas sensors, and particularly relates to a gas sensor based on graded porous WO3 microspheres and a preparation method thereof. A gas-sensitive coating in the gas sensor based on the graded porous WO3 microspheres is prepared from the graded porous WO3 microspheres, the graded porous WO3 microspheres have single hexagonal-phase crystal structures and are uniform in body size and good in individual dispersity, the diameter of the graded porous WO3 microspheres is 3-5 micrometers, and each graded porous WO3 microsphere is formed by assembling WO3 nanorods with the diameter being at the nanoscale and has a large specific surface area and high porosity. According to the preparation method, hydro-thermal synthesis is performed in the presence of a mixing assistant, and the graded porous WO3 microspheres are obtained and assembled to form the finished product. The gas sensor based on the graded porous WO3 microspheres has the advantages of being low in working temperature, high in sensitivity, low in energy consumption, high in selectivity and the like.

The present invention relates to novel electrode active materials represented by the general formula A_aM_b(XY₄)_cZ_d, wherein:

• • (a) A is one or more alkali metals, and 0<a≦8;
  • (b) M is at least one metal capable of undergoing oxidation to a higher valence state, and 1≦b≦3;
  • (c) XY₄ is selected from the group consisting of X′O_4−xY′_x, X′O_4−yY′_2y, X″S₄, and a mixture thereof, where X′ is P, As, Sb, Si, Ge, S, and mixtures thereof; X″ is P, As, Sb, Si, Ge, and mixtures thereof, Y′ is halogen, 0≦x<3, 0<y<4, and 0<c≦3; and
  • (d) Z is OH, a halogen, mixtures thereof, and 0<d≦6.

The invention provides an electrochemical cell which includes a first electrode and a second electrode which is a counter electrode to said first electrode, and an electrolyte material interposed there between. The first electrode comprises an electrode active material represented by the general nominal formula A_a[M_m,MI_n,MII_o](XY₄)_dZ_e, wherein at least one of M, MI and MII is a redox active element, 0<m,n,o≦4, and ½[V(MI)+V(MII)]=V(M), wherein V(M) is the valence state of M, V(MI) is the valence state of MI, and V(MII) is the valence state of MII.

The invention belongs to the technical field of lithium ion batteries, and particularly relates to an anode material for a lithium ion battery. The anode material is in a laminated structure, and the expression of the anode material is Li1+zNixMnyA1-x-yO2; the anode material further comprises a metal oxide or a metal fluoride coated on the surface of the Li1+zNixMnyA1-x-yO2. Compared with the prior art, according to the Li1+zNixMnyA1-x-yO2 provided by the invention, although x is greater than 0.5, and an appropriate synthetic process is adopted, the structure thereof is extremely stable, and the cycle performance of the anode material for the lithium ion battery containing the anode material is good; moreover, the content of Ni is high, thus the specific capacity of the anode material disclosed by the invention is higher and achieves more than 130 mAh/g; moreover, the material is in the laminated structure, so that the multiplying performance is good, and the lithium ion battery can be quickly charged or discharged.

The present invention relates to novel electrode active materials represented by the general formula A_aM_b(XY₄)₂Z_d, wherein:

• (a) A is one or more alkali metals, and 0<a≦8;
• (b) M is at least one metal capable of undergoing oxidation to a higher valence state, and 1≦b≦3;
• (c) XY₄ is selected from the group consisting of X′O_4−xY′_x, X′O_4−yY′_2−y, X″S₄, and a mixture thereof, where X′ is P, As, Sb, Si, Ge, S, and mixtures thereof; X″ is P, As, Sb, Si, Ge, and mixtures thereof, Y′ is halogen, 0≦x<3, 0<y<4, and 0<c≦3; and
• (d) Z is OH, a halogen, or mixtures thereof, and 0<d≦6.

The invention relates to a polypyrrole-clad nano spherical zinc oxide material with a core-shell structure and a preparation method. The polypyrrole-clad nano spherical zinc oxide material takes nano spherical zinc oxide as a core and polypyrrole as a shell cladding the surface of a zinc oxide particle. The preparation method comprises the steps of adding a precipitant such as hexamine to a zinc source, preparing a nano spherical zinc oxide particle by a hydrothermal reaction, adding nano zinc oxide to a solution containing a surfactant to form zinc oxide sol, adding a pyrrole monomer and an oxidant, performing in-situ oxidation polymerization, and forming a polypyrrole-clad layer on the surface of the zinc oxide particle. The prepared polypyrrole-clad nano zinc oxide material with the core-shell structure has a larger specific surface area; the activity of the nano zinc oxide material is improved; aggregation of the nano zinc oxide particle can be well avoided; existing of the polypyrrole-clad layer effectively alleviates pine-tree crystal forming of the zinc oxide particle in charging and discharging processes; and the cycle life of an electrode is significantly prolonged.

The invention discloses a method for preparing intelligent target medicine carrying composite micelles. The surfaces of the composite micelles are modified by target ligands and pH/temperature synergy sensitive polymers at the same time; and reversible transformation between the shielding state of the target ligands during blood circulation (the temperature is 37 DEG C, and the pH value is 7.4) and the deshielding state of the target ligands in tumor tissues (the thermal therapy temperature ranges from 40 DEG C to 44 DEG C, and the pH value ranges from 6.5 to 6.8) is achieved. The pH and temperature dual sensitivities used in the method have the synergy; and the method is more suitable for the complex physiological environment of the human body. The method has the beneficial effects that targeting of the target ligands and the sensitive phase transformation characters of the pH/temperature synergy sensitive polymers are sufficiently used; and a target reversible shielding nanometer drug delivery system with the tumor targeted specificity and the blood circulation stability is built.

A method of making colloidal sphere templates and the sphere-templated porous materials made from the templates. The templated porous materials or thin films comprise micron and submicron-scaled spheres in ordered, disordered, or partially ordered arrays. The invention is useful in the synthesis of submicron porous, metallic tin-based and other high capacity anode materials with controlled pore structures for application in rechargeable lithium-ion batteries. The expected benefits of the resulting nanostructured metal films include a large increase in lithium storage capacity, rate capability, and improved stability with electrochemical cycling.