Abstract: The present application discloses a lithium-supplementing additive, and a preparation method therefor and an application thereof. The lithium-supplementing additive comprises a particulate lithium-supplementing material and also comprises lithium fluoride; moreover, the lithium fluoride is at least bonded to the surface of the lithium-supplementing material, and the lithium fluoride is generated by the reaction between an organic fluorine source and residual alkali contained in the lithium-supplementing material.

Abstract: A cathode lithium-supplementing additive, a preparation method thereof, and an application thereof are disclosed. The cathode lithium-supplementing additive of the present application includes a lithium-supplementing material, the lithium-supplementing material includes fluorine atoms, and the fluorine atoms replace oxygen atoms in the lithium-supplementing material and are in oxygen vacancies. According to the present application, the cathode lithium-supplementing additive is doped with fluorine, has relatively good high-voltage stability and thermal stability and relatively high rate performance, reduces the content of residual alkali, has high storage stability and good processability, and can also reduce gas production, thereby improving the cycle performance, electrochemical performance, and safety performance of a corresponding battery.

Abstract: A low water content cathode material, a preparation method thereof, and a lithium-ion battery are provided. The low water content cathode material includes: a cathode material core, and an outer film layer being coated outside the cathode material core, in which, the outer film layer includes at least one carbon-based layer formed by an oxygen-free carbon source. In the preparation method, by coating a cathode material precursor with an oxygen-free carbon source, a resulting cathode material itself has a water content of 600 ppm or below and has the function of a protective film, such that the cathode material has low water absorption when exposed to a humid environment, and can improve the safety performance of a lithium-ion battery.

Abstract: The present application discloses a cathode lithium-supplementing additive, and a preparation method therefor and an application thereof. The cathode lithium-supplementing additive of the present application is of a core-shell structure, a core of the core-shell structure comprises a cathode lithium-supplementing material, and a coating layer covering the core comprises a piperidine group-containing polymer. The polymer used in the cathode lithium-supplementing additive of the present application imparts the effect of inhibiting active oxygen and the effect of capturing a free radical generated during charging and discharging of a lithium ion battery to the coating layer, such that the amount of gas generated in the charging and discharging process of the lithium ion battery is obviously reduced, and the volume expansion of the lithium ion battery is reduced.

Abstract: Disclosed is a composite lithium-supplementing additive, a preparation method, and application thereof. The composite lithium-supplementing additive comprises a core containing an amorphous lithium-supplementing additive and an encapsulation layer coated on the outer surface of the core. In the composite lithium-supplementing additive provided in the present application, the activation potential barrier is low, the lithium deintercalation efficiency is high at a relatively low voltage, and the specific capacity of lithium supplement is high.

Abstract: The present application discloses a lithium supplement additive and a preparation method and application thereof. The lithium supplement additive has a core-shell structure, which includes a core body and a shell layer coated on the core body. The core body is a lithium-source core body for supplying lithium, and the shell layer is a functional capsulation layer, and the functional capsulation layer includes a dense isolating capsulation layer which completely covers the lithium-source core body. The lithium supplement additive of the present application can release as much lithium ions as possible at one time to compensate the irreversible consumption of the lithium ions by the formation of the SEI on the anode, thereby maintaining the abundance of lithium ions in the battery system. The preparation method of the lithium supplement additive can ensure the stability of the structure and electrochemical performance of the lithium supplement additive prepared.

Abstract: The application discloses a single-core multi-shell lithium manganese iron phosphate cathode material and a preparation method thereof, and a secondary battery. The composite material includes: a carbon-coated lithium iron phosphate core, and a plurality of lithium manganese iron phosphate cladding layers cladded on an outer surface of the carbon-coated lithium iron phosphate core. Each of the plurality of lithium manganese iron phosphate cladding layers includes lithium manganese iron phosphate particles and a carbon material coated on the lithium manganese iron phosphate particles. The lithium manganese iron phosphate particles in the plurality of the lithium manganese iron phosphate cladding layers have particle sizes increase in a radial direction from inside to outside.

Abstract: Disclosed are a positive electrode lithium supplementing additive, and a preparation method therefor and an application thereof. The positive electrode lithium supplementing additive includes a core body and a compact packaging layer covering the core body. The core body has a lithium-rich lithium supplementing material, and the material of the compact packaging layer has an inorganic aluminum compound. The positive electrode lithium supplementing additive in the present application has high compactness because of the compact packaging layer, and is high in lithium ion fall-off rate and lithium ion conductivity and low in residual alkali content, and thus has excellent lithium supplementing effect, lithium supplementing stability, and processing performance.

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: Provided are a cathode lithium-supplementing additive and a preparation method therefor, a cathode sheet, and a secondary battery. The cathode lithium-supplementing additive comprises a Li8FePO4 core and an isolating conductive encapsulation layer coating the outer surface of the core. The cathode lithium-supplementing additive comprises the Li8FePO4 core and the isolating conductive encapsulation layer, so that the lithium supplement capacity is relatively good, and active lithium ions consumed due to formation of an SEI film during first charging of the battery are supplemented; moreover, lithium ions in Li8FePO4 can also serve as a cathode material to participate in lithium ion circulation in the battery. Moreover, no gas is generated during lithium deintercalation.

Abstract: The present application belongs to battery materials, and in particular, to a lithium-containing multi-phosphate cathode material and a preparation method therefor, and a secondary battery. The lithium-containing multi-phosphate cathode material includes a single-core multi-shell lithium manganese iron phosphate composite material, the composite material includes a core of lithium iron phosphate or lithium manganese iron phosphate, N lithium manganese iron phosphate coating layers coated on an outer surface of the core, and a carbon coating layer coated on an outermost layer of the composite material; N is an integer greater than or equal to 1; a manganese content in the N lithium manganese iron phosphate coating layers successively increases in a radially outward direction, and a particle size of the lithium manganese iron phosphate particles in the N lithium manganese iron phosphate coating layers successively decreases in the radially outward direction.

Abstract: A cathode lithium-supplementing additive, a preparation method, and an application thereof are provided. The cathode lithium-supplementing additive includes: a lithium-containing core, and a coating layer formed on a surface of the lithium-containing core, in which, a material of the coating layer is selected from a conductive hydrophobic polymer having a surface modified with a hydrophobic enhancer. On the one hand, the formed coating layer can make up for the defect that the lithium-containing compound itself has poor electronic conductivity and can improve the electronic conductivity, in the meanwhile reduce the amount of conductive agent to be added to the electrode plate; and on the other hand, since the polymer has the surface modified with the hydrophobic enhancer, hydrophobic groups are provided, which further provides a hydrophobic barrier, so as to effectively improve the stability of the lithium-containing core in the air.

Abstract: A core-shell cathode lithium-supplementing additive, a preparation method therefor, and an application thereof. The core-shell cathode lithium-supplementing additive of the present application comprises a core body and a coating layer covering the core body, the coating layer being an isolating conductive packaging layer, the core body containing a lithium-supplementing material, and the lithium-supplementing material comprising Li2+cAcB1?c and/or LiaXb, wherein 0?c?1, A is at least one of N and P, B is at least one of S and O, 1?a?3, 1?b?3, and X is any one selected from F, S, N, B, P, O, and Se. The lithium-supplementing material contained in the core-shell cathode lithium-supplementing additive of the present application is rich in lithium, thereby increasing the Coulombic efficiency and improving the overall electrochemical performance of a battery.

Abstract: The present application discloses a lithium-rich iron-based composite material and a preparation method and application thereof. The lithium-rich iron-based composite material includes a lithium-rich iron-based material having a molecular formular of aLiFeO2·bLi2O·cMxOy, where a, b, and c are numbers of moles, and 0?c/(a+b+c)?0.02, 1.8?b/a?2.1, M is a doping element, and 1?y/x?2.5. The lithium-rich iron-based composite material can provide abundant lithium, and the lithium-rich iron-based material has a high purity and low residual alkali on the surface, which lead to high capacity and good lithium supplementing effect, as well as good stability for storage and processing. The application of the lithium-rich iron-based composite material in a lithium-supplementing additive for cathodes, a cathode material, a cathode and a lithium-ion battery.

Abstract: A binary lithium-supplementing additive, including: a carbon matrix and a binary lithium-supplementing material dispersed in the carbon matrix. At least a carbon layer on a surface of the carbon matrix is a dense carbon layer, and the binary lithium-supplementing material has a molecular formula of LiaXb, in which, 1?a?3, 1?b?3, and X is any one selected from F, S, N, B, P, O, and Se. The binary lithium-supplementing material contained in the binary lithium-supplementing additive is rich in lithium, thereby maintaining the abundance of lithium ions in the battery system and improving the first charge-discharge efficiency and overall electrochemical performance of the battery. The binary lithium-supplementing material is dispersed in the carbon matrix to ensure uniform dispersion and stability of the binary lithium-supplementing material, so as to achieve a stable lithium-supplementing effect.

Abstract: A lithium-supplementing additive, a preparation method therefor and application thereof. The lithium-supplementing additive includes a core body and a functional encapsulation layer coated on the core body, and the core body includes a lithium-supplementing material. Lithium carbonate is dispersed in the interface between the functional encapsulation layer and the core body or/and in the functional encapsulation layer. In the lithium-supplementing additive of the present application, the lithium carbonate dispersed in the interface between the functional encapsulation layer and the core body or/and in the functional encapsulation layer has a synergistic effect with the functional encapsulation layer, and can effectively improve the effect of the functional encapsulation layer on the core body, so that the core body is isolated from ambient moisture and CO2 to ensure the stability of the core body, thereby ensuring the effect and stability of lithium supplementation of the lithium-supplementing additive.

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: Provided is an auto-thermal evaporative liquid-phase synthesis method for cathode material for battery, comprising the following steps: (1) Adding a synthetic raw material of cathode material into a solvent to obtain a mixture A, the synthetic raw material of the cathode material containing lithium source, adding an accelerant into the mixture A, which makes the mixture A achieve a strong auto-thermal reaction to release heat to evaporate the solvent, and obtaining a solid precursor of the cathode material; (2) Drying the precursor, sintering in an atmosphere furnace and obtaining the cathode material. The method is simple in process, low in energy consumption, requirements for equipment and cost, and is applicable to industrial mass production and application. The cathode material obtained through the method is stability in batch, easy to process, low in internal resistance and high in capacity and has an excellent charging and discharging performance.

Abstract: A composite positive electrode material with a core-shell structure for a lithium ion battery consists of a core active material and a shell active material. The core active material is a lithium iron phosphate or a lithium manganate, and the shell active material is a composite lithium iron phosphate with carbon. The carbon is one or more of carbon nanotube, superfine conductive carbon black and amorphous carbon material. The composite positive electrode material includes from 65% to 99% core active material and from 1% to 35% shell active material, based on the total weight of the composite positive electrode material. The composite positive electrode material has stable property and excellent electrochemistry performance. The lithium ion battery made with the material has higher charge-discharge capacity, excellent cycle performance. It can be charged quickly and discharged at high rate. A preparing method for the composite positive electrode material is also provided.