Abstract: The invention relates to a method for preparing high-stability liquid blueberry anthocyanins, belonging to the field of food processing. A method for preparing high-stability liquid blueberry anthocyanins comprises the following process steps: adding graphene oxide and chitosan to an MES buffer solution at room temperature, mixing homogeneously and adding EDC and NHS sequentially, reacting to obtain a first solution; adding dry blueberry anthocyanin powder in the first solution, adjusting pH to 4.5 to 5.0 and mixing homogeneously to obtain a second solution, and treating the second solution at 350 to 420 MPa and 2 to 4° C. to obtain the product. The method for increasing the stability of blueberry anthocyanins provided by the present invention uses dry blueberry anthocyanin powder as a raw material and adds graphene oxide combined with chitosan compound as an anthocyanin stabilizer, thereby increasing the stability of blueberry anthocyanins during processing and production.

Abstract: A method for measuring drop time of a control rod cluster integrated with a rod position measurement device is provided, wherein the method is used to measure the drop time of each control rod cluster, and includes: Si, monitoring a voltage Ua of coils in Group A to capture a rod cluster drop signal; S2, searching a point (tmax, Vmax) with a maximum drop speed or with a local maximum drop speed; S3, retroactively calculating, from tmax, an end of a time period T4 when the control rod cluster starts to drop; S4, retroactively searching, from a minimum value point of a drop reference signal DROPref, a start of the time period T4 when the drop reference signal DROPref drops from a maximum value to 33% thereof; and S5, determining, from tmax forward, a time point t6 when a drop speed of the control rod cluster is lower than 0.

Abstract: A cathode material includes: a plurality of first particles. Each first particle includes a secondary particle composed of a plurality of third particles, and the first particle includes a first lithium-containing transition metal oxide; and a plurality of second particles. The second particle includes a fourth particle and/or a secondary particle composed of a plurality of fourth particles, and the second particle includes a second lithium-containing transition metal oxide. The electrochemical device including the cathode material is significantly improved in the aspects of energy density, capacity attenuation and service life.

Abstract: A positive electrode, including a positive electrode current collector and a positive electrode active substance layer, where the positive electrode active substance layer is located on at least a part of one surface or two surfaces of the positive electrode current collector, the positive electrode active substance layer includes a positive electrode material, and the positive electrode material includes element Li; and when a mass percentage of element Li of the positive electrode in the positive electrode active substance layer as tested using an inductively coupled plasma spectrometer (ICP) ranges from 1.45% to 1.55%, an integral intensity of CO2 obtained by testing the positive electrode using a differential electrochemical mass spectrometry is Q?2000 nmol/mg. This application can improve high-temperature cycling performance and safety of the electrochemical apparatus.

Abstract: A cathode material includes a lithium composite oxide matrix including lithium (Li) and at least one selected from the group consisting of cobalt (Co), nickel (Ni), manganese (Mn), and aluminium (Al), and has a surface layer which is a rocksalt structure and includes tungsten (W); and a material layer formed on the surface layer of the lithium composite oxide matrix and including tungsten (W) and lithium (Li). The cathode material of the present application provides excellent high-temperature cycle and high-temperature storage performance, and the capability of discharge at a high rate, and improves the safety performance of the electrochemical device.

Abstract: A cathode material includes a lithium composite oxide having lithium (Li) and at least one selected from cobalt (Co), nickel (Ni), manganese (Mn) or aluminum (Al); and a lithium-containing transition metal nitride. A transition metal in the lithium-containing transition metal nitride is at least one selected from cobalt (Co), nickel (Ni), or manganese (Mn). The cathode material provides excellent dynamic performance.

Abstract: A cathode material includes: a plurality of first particles. Each first particle includes a secondary particle composed of a plurality of third particles, and the first particle includes a first lithium-containing transition metal oxide; and a plurality of second particles. The second particle includes a fourth particle and/or a secondary particle composed of a plurality of fourth particles, and the second particle includes a second lithium-containing transition metal oxide. The electrochemical device including the cathode material is significantly improved in the aspects of energy density, capacity attenuation and service life.

Abstract: A positive electrode active material, including: a secondary particle formed from a primary particle. The secondary particle includes an inner part and an outer part that wraps the inner part. A ratio of an average particle size of primary particles in the outer part to an average particle size of primary particles in the inner part is G, and 1.1?G?10. The outer part is a region from an interface of the secondary particle to a surface of the secondary particle, and the inner part is a region from the interface of the secondary particle to a center of the secondary particle. The positive electrode active material in this disclosure improves cycle performance while ensuring good rate performance.

Abstract: A positive electrode material includes secondary particles formed from primary particles. The positive electrode material satisfies the following relational expression: 15%?(Dv50a?Dv50b)/Dv50b?80%, where Dv50a represents Dv50 directly measured by a laser particle size analyzer for the positive electrode material without ultrasonic treatment, Dv50b represents Dv50 measured by the laser particle size analyzer for the positive electrode material after ultrasonic treatment, and Dv50 represents a particle size of the positive electrode material at a cumulative volume of 50% in a volume-based particle size distribution as measured by starting from small particle sizes. The secondary particles of the positive electrode material that meets the foregoing condition can form soft agglomerates, so that the electrochemical device is of high cycle performance and high safety performance.

Abstract: The present application relates to a cathode material and a lithium ion battery. Particularly, the cathode material includes a matrix and a coating layer, wherein the matrix includes lithium cobalt oxide bulk-doped with metal element M, and the coating layer has a spinel phase structure doped with metal element Me. The spinel phase structure can form three-dimensional lithium ion channels, thereby increasing a diffusion path of lithium ions, and introducing more electrochemical reaction active sites. Therefore, when the lithium ion battery with the cathode material is discharged at a current of about 6 C at about ?10° C., a capacity retention rate is up to about 99% or above as compared with that when the current is about 0.5 C. At the same time, the lithium ion battery also has high temperature stability, and has excellent cycle performance in high-temperature heavy-current charge-discharge environments.