Abstract: The disclosure provides a composite anode electrode material and a preparation method thereof, an anode electrode material and a lithium ion battery. The composite anode electrode material includes a defect-type transition metal oxide and a lithium titanate, wherein the lithium titanate is compounded with the defect-type transition metal oxide in the manner of coating and/or doping, the defect-type transition metal oxide is a secondary particle, and a transition metal element in the defect-type transition metal oxide is selected from any one of tungsten, yttrium and tin. The probability of a side reaction between the defect-type transition metal oxide and an electrolyte is greatly reduced and a volume expansion effect of an anode electrode of a battery in the process of deintercalating lithium ions is greatly reduced, thereby the lithium ion battery including the composite anode electrode material has a higher capacity retention rate after cycling.

Abstract: Provided are a cobalt-free positive electrode material, a preparation method thereof and a lithium ion battery. The preparation method includes: first sintering step is performed on a lithium source material and a cobalt-free precursor, to obtain a sintered product; the sintered product is crushed to 1 to 2 ?m, to obtain a cobalt-free single crystal material; and second sintering step is performed on the cobalt-free single crystal material, a boron coating agent and a carbon coating agent, to obtain the cobalt-free positive electrode material. The cobalt-free positive electrode material prepared by the above method has advantages of stable structure, high electric capacity, excellent current rate performance and good cycle performance and the like.

Abstract: A positive electrode material, a preparation method therefor and a lithium ion battery. The positive electrode material has a core-shell structure, the core layer comprises a cobalt-free single crystal positive electrode active material, and the shell layer comprises LiAlO2 and LiFePO4. By coating the surface of the cobalt-free single crystal positive electrode active material with LiAlO2 and LiFePO4, the conductivity of the cobalt-free single crystal layered positive electrode material is improved, thereby improving the capacity, the rate and the cyclability of the material.

Abstract: The invention discloses a kind of toy train comprises a locomotive and a train body; the locomotive is provided with a spray device, a battery for supplying power for the spray device, and a control unit for controlling spray; the spray device comprises a water storage bin, an atomizing generator, three spray ports and a water filling port; the atomizing generator is electrically connected with the control unit; the spray ports are respectively arranged at the top and both sides of the water storage bin; and during use, the spray ports spray toward an upper part and both sides at the same time, with three-dimensional spray effect. The invention breaks the traditional spray device modeling, and improves the arrangement positions of the spray ports to change the spray direction so that the spray is more three-dimensional and the structural form of the toy train that can spray is enriched.

Abstract: The invention relates to the technical field of toys, and particularly relates to a toy dinosaur, which comprises a body, a head, a tail, front jaws and legs; the body is movably connected with the legs; a driving mechanism for driving the legs to move back and forth is arranged in the legs and the body; the driving mechanism comprises a power source arranged in the body and a linkage mechanism arranged in the legs; the linkage mechanism is movably connected with the body, the legs and/or the power source respectively; and the power source drives the legs through the linkage mechanism to move back and forth, to realize movement of the toy dinosaur through the legs.

Abstract: Provided are a lithium nickel manganese oxide composite material, a preparation method thereof and a lithium ion battery. The preparation method includes: a first calcining process is performed on a nano-oxide and a nickel-manganese precursor, to obtain an oxide-coated nickel-manganese precursor; and a second calcining process is performed on the precursor and a lithium source material, to obtain the lithium nickel manganese oxide, and a temperature of the first calcining process is lower than the second calcining process. At a lower temperature, the nano-oxide may be melted, a denser nano-oxide coating layer is formed on the surface of the precursor, so the oxide-coated nickel-manganese precursor is obtained. At a higher temperature, the nano-oxide, a nickel-manganese material and a lithium element may be more deeply combined. A problem that the nano-oxide layer is easy to fall off is solved, and cycle performance of the lithium nickel manganese oxide is greatly improved.

Abstract: Provided are a cobalt-free positive electrode material for a lithium ion battery, a preparation method therefor and a lithium ion battery. The method for preparing the cobalt-free positive electrode material for the lithium ion battery comprises: mixing lithium nickel manganese oxide with sulfate, so as to obtain a first mixture; and reacting the first mixture at a predetermined temperature, so as to obtain the cobalt-free positive electrode material. The cobalt-free positive electrode material comprises lithium nickel manganese oxide and a cladding layer of an outer surface thereof, and the cladding layer comprises lithium sulphate. The lithium ion battery comprises the cobalt-free positive electrode material. The cobalt-free positive electrode material has a relatively high electrical performance and a relatively low alkali content.

Abstract: A composite positive electrode material for a lithium ion battery, a preparation method therefor, and a use thereof. The composite positive electrode material comprises a positive electrode material core and a halide coating layer that is coated on the surface of the positive electrode material core, wherein halide comprises Li3YX6, and X is at least one among halogens. By means of the coating of the halide coating layer, the ionic conductivity and structural stability of the positive electrode material are greatly increased, which reduces the surface impedance of the material.

Abstract: A cobalt-free single crystal composite material, and a preparation method therefor and a use thereof. The cobalt-free single crystal material is of a core-shell structure, the core layer is the cobalt-free single crystal material, and the shell layer is prepared from TiNb2O7 and conductive lithium salt. The TiNb2O7 and the conductive lithium salt are selected as materials of the shell layer to coat the cobalt-free single crystal material, thereby improving the lithium ion conductivity of the cobalt-free single crystal material, and further improving the capacity and the first effect of the material.

Abstract: A cobalt-free positive electrode material and a preparation method therefor, a lithium ion battery positive electrode, and a lithium ion battery, relating to the technical field of lithium ion batteries. The positive electrode material comprises a core and a shell covering the core, the core being a cobalt-free positive electrode material, the chemical formula of the core being LiNixMnyO2, wherein 0.55?x?0.95 and 0.05?y?0.45, and the shell is a coating agent and carbon. The present method can improve the dispersibility of the cobalt-free positive electrode material during the coating process, and can also improve the conductivity of the cobalt-free positive electrode material.

Abstract: A gradient doped cobalt-free positive electrode material and a preparation method therefor, a lithium-ion battery positive electrode, and a lithium battery. The positive electrode material consists of LiNixMnyAzO2. The content of element A in the positive electrode material decreases in a direction from a surface layer of the positive electrode material to the center, and A is one or more of Al, Zr, Ti, B, and W. The preparation method is easy to implement, simplifies roasting condition requirements, and provides a cobalt-free positive electrode material having good cycle performance.

Abstract: The present disclosure provides a cobalt-free cathode material of a lithium ion battery, a method for preparing the cobalt-free cathode material, and the lithium ion battery. A general formula of the cobalt-free cathode material is LixNiaMnbRcO2, wherein, 1?x?1.15, 0.5?a?0.95, 0.02?b?0.48, 0<c?0.05, and R is aluminum or tungsten. Therefore, as the cobalt-free cathode material is free of metal cobalt, the cost of the cathode material can be lowered effectively. Aluminum or tungsten in the cobalt-free cathode material can stabilize a crystal structure of the cathode material better, such that the lithium ion battery has excellent rate capability and cycle performance, and furthermore, good cycling stability of the lithium ion battery can be still maintained under a high-temperature and high-pressure testing condition.