Abstract: Disclosed are a lithium-rich composite material, and a preparation method thereof, and an application thereof. The lithium-rich composite material includes a core and a dense hydrophobic layer coated on the core. The core includes a lithium-rich material, and a material of the dense hydrophobic layer includes a polyanionic electrochemically active material, and the polyanionic electrochemically active material is a phosphate electrode active material. The lithium-rich composite material of the present application includes a dense hydrophobic layer, which has high compactness, low content of residual alkali and high chemical stability when being in contact with an electrolyte. In addition, the preparation method of the lithium-rich composite material can ensure that the structure and the electrochemical performances of the prepared lithium-rich composite material are stable; moreover, the efficiency is high and the production cost is saved.

Abstract: A multi-rule decision method of evaluating comprehensive performance of a battery stack includes selecting multiple indexes affecting the performance of the battery stack as a single-performance decision rule of the battery stack to form a decision rule vector. The method includes based on classical best worst method, obtaining a weight of each evaluation person of the comprehensive performance of the battery stack for the single-performance decision rule of the battery stack in the decision rule vector. The method includes based on entropy theory, aggregating the weight of the single-performance decision rule of the battery stack determined by each evaluation person of the comprehensive performance of the battery stack to obtain an importance weight of the evaluation persons of the comprehensive performance of the battery stack satisfying the iteration stop condition and a final comprehensive weight of the single-performance decision rule of the battery stack.

Abstract: A silicon-based anode material, including a silicon-based core; and a shell layer arranged on the silicon-based core, the silicon-based core comprises SiOx and silicon microcrystals dispersed in the SiOx, where 0.9?x?1.3; and a distribution density of the silicon microcrystals gradually decreases along a direction from a surface of the silicon-based core to the center of the silicon-based core, the shell layer includes a carbon layer. The silicon-based anode material has high capacity and low volume expansion effect, and the battery capacity and cycle performance can be improved in the applications in non-aqueous electrolyte secondary batteries. A preparation method for a silicon-based anode material for lithium-ion batteries.

Abstract: A lithium-replenishing additive is provided. The lithium-replenishing additive includes a lithium-rich-material core and a shell layer disposed at the lithium-rich-material core. The lithium-rich-material core is made of a lithium-rich material with an average chemical formula of aNixMyO2 ·bLi2O, where 0.95?x?1, 0.01?y?0.05, 1?z?1.15, 0.8?a?1.1, 0.8?b?1.1, and the M includes one or more of copper (Cu), cobalt (Co), aluminum (Al), titanium (Ti), vanadium (V), zirconium (Zr), or iron (Fe). The shell layer includes a polymer layer. A preparing method of a lithium-replenishing additive and a lithium secondary battery are further provided.

Abstract: Disclosed is a method of predicting a failure probability of a brittle material in a high temperature creep state. Based on the prior art, assuming that an uniaxial creep failure strain obeys Weibull Distribution in combination with a natural attribute of random distribution of internal defects of the brittle material, a probability density distribution curve of the uniaxial creep failure strain is obtained by using an uniaxial creep test, and a probability density function of a multiaxial creep failure strain is obtained based on a conversion relationship of uniaxial and multiaxial creep failure strains and further a calculation model of a failure probability is obtained by integration; based on this, a prediction result of a failure probability of the brittle material in the high temperature creep state is obtained by writing a sub-program by using a Fortran language and embedding the sub-program into a finite element software in combination with a creep-damage constitutive equation.

Abstract: A design method for creep-fatigue strength of a plate-fin heat exchanger. The method includes preliminarily designing the plate-fin heat exchanger according to its service requirements, making a primary stress assessment for the plate-fin heat exchanger, calculating the equivalent mechanical and thermophysical parameters of the plate-fin heat exchanger core to satisfy the allowable stress requirement, performing a thermal fatigue analysis for the plate-fin heat exchanger based on these parameters and then calculating the fatigue life and creep life of the plate-fin heat exchanger to accomplish the comprehensive design of the plate-fin heat exchanger in the high-temperature service. The design method provides an effective method for the high temperature design of the plate-fin heat exchanger.

Abstract: A design method for creep-fatigue strength of a plate-fin heat exchanger. The method includes preliminarily designing the plate-fin heat exchanger according to its service requirements, making a primary stress assessment for the plate-fin heat exchanger, calculating the equivalent mechanical and thermophysical parameters of the plate-fin heat exchanger core to satisfy the allowable stress requirement, performing a thermal fatigue analysis for the plate-fin heat exchanger based on these parameters and then calculating the fatigue life and creep life of the plate-fin heat exchanger to accomplish the comprehensive design of the plate-fin heat exchanger in the high-temperature service. The design method provides an effective method for the high temperature design of the plate-fin heat exchanger.

Abstract: The power control profile of a power amplifier circuit has improved linearity by supplying an exponential current source. The current source is an exponent function of the control voltage. There is obtained improved linearity of the power output vs control voltage profile for the power amplifier circuit. Advantageously, the exponential current source provides for a temperature compensated power amplifier circuit as well as the circuit having improved performance for variations in a power supply voltage.