Abstract: The present disclosure relates to a lithium-ion secondary battery, a battery apparatus, an electrical apparatus, and preparation methods for a positive electrode active material and a positive electrode plate. The battery includes a positive electrode plate, a negative electrode plate, and an electrolyte. The positive electrode plate comprises a current collector and a film layer disposed on at least one side of the collector. The film layer comprises a positive electrode active material including lithium-containing transition metal phosphate particles, at least part of the surfaces of which are coated with a carbon material. In a cross-section along the electrode plate thickness direction, the DA90 of the particles ranges from 1400 nm to 2100 nm, and the particle size concentration ratio (DA90-DA10)/DA50 ranges from 1.855 to 2.375, wherein DA90, DA50, and DA10 respectively denote the particle sizes corresponding to 90%, 50%, and 10% of the area cumulative distribution.

Abstract: An animal feeder and a control method thereof comprise a frame, a container, a baffle plate, a rotating structure, a detection mechanism, and a driving mechanism; the detection mechanism and driving mechanism are arranged on the frame. The frame comprises a door frame and a base, the base is provided with a placement groove for placing the container. The baffle plate and base constitute a first blocking area. The rotating structure is arranged on one side of the container and comprises an open position and a closed position. When in closed position, the rotating structure forms a closed space with the base and the baffle plate respectively. When in open position, the rotating structure forms a second blocking area with baffle plate. It has following beneficial effects: when in closed position, the rotating structure and first blocking area enclose the container, preventing animals from contacting container from any direction.

Abstract: The disclosure relates to a lithium-ion secondary battery, a battery apparatus, an electric apparatus, and methods for preparing a positive electrode active material and a positive electrode plate. The lithium-ion secondary battery includes a positive electrode plate, a negative electrode plate, and an electrolyte. The positive electrode plate comprises a current collector and a film layer disposed on at least one side of the current collector. The film layer comprises a positive electrode active material including lithium-containing transition metal phosphate particles, at least part of the surfaces of which are coated with a carbon material. In a section of the film layer along the electrode plate thickness direction, an area proportion of particles with a particle size greater than or equal to 1.5 ?m is 8.0% to 20.0%. In a cumulative distribution curve of graphitization degree, a median C50 of the film layer ranges from 0.95 to 1.20.

Abstract: A lithium-ion secondary battery is disclosed. The battery includes a positive electrode plate, a negative electrode plate, and an electrolyte. The positive electrode plate includes a current collector and a positive electrode film layer on at least one side of the current collector. The film layer includes a positive electrode active material comprising lithium-containing transition metal phosphate particles, at least a portion of whose surfaces are coated with a carbon material. In a sphericity area cumulative distribution curve for particles having sizes?1 ?m obtained from a cross-section of the positive electrode film layer in the thickness direction, a sphericity median LR1A50 is between 0.71 and 0.85. The present application further provides a battery apparatus, an electrical apparatus, a method for preparing the positive electrode active material, and a method for preparing the positive electrode plate.

Abstract: A lithium-ion secondary battery includes a positive electrode plate, a negative electrode plate, and an electrolyte. The positive electrode plate includes a positive electrode current collector and a positive electrode film layer arranged on at least one side of the positive electrode current collector. The positive electrode film layer includes a positive electrode active material. The positive electrode active material includes lithium-containing transition metal phosphate particles at least partially provided with a carbon coating material on surfaces. The area proportion of the particles with a particle size greater than or equal to 1.5 ?m in a cross section of the positive electrode film layer along a thickness direction of the electrode plate is greater than or equal to 8.0% and less than or equal to 20.0%. The iron dissolution rate of the positive electrode film layer ranges from 658 ppm to 1,921 ppm.

Abstract: A lithium-ion secondary battery, a battery apparatus, a power consuming apparatus, and methods for preparing a positive electrode active material and a positive electrode plate are disclosed. The lithium-ion secondary battery comprises a positive electrode plate, a negative electrode plate, and an electrolyte. The positive electrode plate includes a current collector and a positive electrode film layer disposed on at least one side of the current collector. The positive electrode film layer comprises a positive electrode active material including lithium-containing transition metal phosphate particles, at least part of the surfaces of which are coated with a carbon material. In a cross-section of the positive electrode film layer along the electrode plate thickness direction, an area proportion of particles having a particle size greater than or equal to 1 ?m is 30.0% to 50.0%. A mass proportion of a magnetic material ranges from 20 ppm to 1980 ppm.

Abstract: A lithium-ion secondary battery, a battery apparatus, a power-consuming apparatus, and methods for preparing a positive electrode active material and a positive electrode plate are provided. The lithium-ion secondary battery includes a positive electrode plate, a negative electrode plate and an electrolyte. The positive electrode plate includes a positive electrode current collector and a positive electrode film layer disposed on at least one side thereof. The positive electrode film layer includes a positive electrode active material comprising lithium-containing transition metal phosphate particles having at least partially carbon-coated surfaces. In a cumulative distribution curve of a graphitization degree C. value measured by laser confocal Raman spectroscopy in a mapping mode, a median value C50 is from 0.95 to 1.20, and a concentration (C90-C10)/C50 is from 0.01 to 0.04. The graphitization degree C.

Abstract: A lithium-ion secondary battery is disclosed, along with a battery apparatus, a power-consuming apparatus, and methods for preparing a positive electrode active material and a positive electrode plate. The battery includes a positive electrode plate, a negative electrode plate, and an electrolyte. The positive electrode plate includes a current collector and a positive electrode film layer on at least one side of the current collector. The film layer includes a positive electrode active material comprising lithium-containing transition metal phosphate particles having surfaces at least partially coated with a carbon material. In a cross section of the positive electrode film layer along the electrode thickness direction, the area proportion of particles having a particle size ?1.5 ?m is between 8.0% and 20.0%. In a sphericity area cumulative distribution curve of the particles from this cross section, a sphericity median LA50 ranges from 0.70 to 0.74.

Abstract: The disclosure relates to a lithium-ion secondary battery, a battery apparatus, an electric apparatus, and methods for preparing a positive electrode active material and a positive electrode plate. The lithium-ion secondary battery includes a positive electrode plate, a negative electrode plate, and an electrolyte. The positive electrode plate comprises a current collector and a film layer disposed on at least one side of the current collector. The film layer comprises a positive electrode active material including lithium-containing transition metal phosphate particles, at least part of the surfaces of which are coated with a carbon material. In a section of the film layer along the electrode plate thickness direction, an area proportion of particles with a particle size greater than or equal to 1.5 ?m is 8.0% to 20.0%. In a cumulative distribution curve of graphitization degree, a median C50 of the film layer ranges from 0.95 to 1.20.

Abstract: A positive electrode active material, a positive electrode plate, a secondary battery, and a power consuming apparatus are provided. The positive electrode active material includes (i) secondary particles and (ii) single-crystal or quasi-single-crystal particles. The secondary particles are mainly formed by aggregating primary particles and the secondary particles further include an M1 element. The M1 element includes a transition metal element other than iron. A mass content of the M1 element is X1 based on a total mass of the secondary particles, where 500 ppm?X1?5000 ppm, and optionally, 800 ppm?X1?2000 ppm. The single-crystal or quasi-single-crystal particles include an Ma element. The Ma element includes a transition metal element other than iron. A mass content of the Ma element is X2 based on a total mass of the single-crystal or quasi-single-crystal particles, where X2 is less than X1.

Abstract: An electrode sheet, a secondary battery, an electric device, a preparation method, and a reuse method are described. The electrode sheet comprises a current collector and multiple active material layers located on at least one side of the current collector; the multiple active material layers comprise a first active material layer and a second active material layer, wherein the second active material layer is the active material layer farthest from the current collector, and the first active material layer is located between the second active material layer and the current collector, and comprises current collector particles.

Abstract: The present disclosure relates to a lithium-ion secondary battery, a battery apparatus, an electrical apparatus, and preparation methods for a positive electrode active material and a positive electrode plate. The battery includes a positive electrode plate, a negative electrode plate, and an electrolyte. The positive electrode plate comprises a current collector and a film layer disposed on at least one side of the collector. The film layer comprises a positive electrode active material including lithium-containing transition metal phosphate particles, at least part of the surfaces of which are coated with a carbon material. In a cross-section along the electrode plate thickness direction, the DA90 of the particles ranges from 1400 nm to 2100 nm, and the particle size concentration ratio (DA90?DA10)/DA50 ranges from 1.855 to 2.375, wherein DA90, DA50, and DA10 respectively denote the particle sizes corresponding to 90%, 50%, and 10% of the area cumulative distribution.

Abstract: A positive electrode active material, a positive electrode plate, a secondary battery, and a power consuming apparatus are provided. The positive electrode active material includes (i) secondary particles and (ii) single-crystal or quasi-single-crystal particles. The secondary particles are mainly formed by aggregating primary particles and the secondary particles further include an M1 element. The M1 element includes a transition metal element other than iron. A mass content of the M1 element is X1 based on a total mass of the secondary particles, where 500 ppm?X1?5000 ppm, and optionally, 800 ppm?X1?2000 ppm. The single-crystal or quasi-single-crystal particles include an Ma element. The Ma element includes a transition metal element other than iron. A mass content of the Ma element is X2 based on a total mass of the single-crystal or quasi-single-crystal particles, where X2 is less than X1.

Abstract: A friction-reducing and wear-resistant polyamide-imide composite material, a preparation method thereof and an application method therefor are provided, which relate to the technical field of polymer materials. The composite material includes the following raw materials in part by weight: 100 parts of basic slurry, 0.1-20 parts of functional filler, 0-50 parts of diluent, 0.1-1 part of defoamer, and 0.1-1 part of dispersant. The basic slurry is aqueous polyamide-imide emulsion. The functional filler is a biomass carbon composite molybdenum disulfide material treated with a siloxane coupling agent, and a source of biomass carbon is cattail-derived carbon fibers. The composite material has advantages of low friction coefficient and wear rate, wide raw material sources, environmental friendliness, and high dispersion stability. The preparation method has a simple and convenient process and can meet demands for planned production.

Abstract: A method and a device for data migration of a blockchain. The method includes generating a state tree based on state data of accounts in the blockchain, in which the state tree is a B+ tree based on a copy-on-write technology, and each leaf node of the state tree is configured to store the state data; determining a target state tree to be migrated from the generated state tree when data migration is triggered; sending state data of the target state tree to an extended node of a master node; if migration completion information is received from the extended node, updating a data mapping table stored in the master node, in which the data mapping table is configured to represent a mapping relationship between state data stored in the extended node and the extended node; and deleting the target state tree in the master node.

Abstract: A B+-tree-based data management method includes writing, when a first write operation on a node data of a B+ tree is detected, the node data to a base page of a disk, wherein the base page contains a pointer field configured to indicate an associated delta page; creating a first delta record in a delta page based on the base page, when a first write operation on a target entry in the base page is detected; creating a second delta record in the delta page when a second write operation on the target entry is detected, the second delta record is used to record second data corresponding to the second write operation. Accordingly, a waste of disk space may be reduced, and complexity of read-write operations may be lowered.

Abstract: A positive electrode active material, a positive electrode plate, a secondary battery, and a power consuming apparatus are provided. The positive electrode active material includes (i) secondary particles and (ii) single-crystal or quasi-single-crystal particles. The secondary particles are mainly formed by aggregating primary particles and the secondary particles further include an M1 element. The M1 element includes a transition metal element other than iron. A mass content of the M1 element is X1 based on a total mass of the secondary particles, where 500 ppm?X1?5000 ppm, and optionally, 800 ppm?X1?2000 ppm. The single-crystal or quasi-single-crystal particles include an Ma element. The Ma element includes a transition metal element other than iron. A mass content of the Ma element is X2 based on a total mass of the single-crystal or quasi-single-crystal particles, where X2 is less than X1.

Abstract: A method for privacy protection of smart contract includes: obtaining a variable identifier, a privacy-trigger sub-script, and ciphertexts of a plurality of privacy-trigger sub-scripts of other participating users input by the user intending to perform a transaction in response to a transaction instruction; determining a target state variable corresponding to the variable identifier from the smart contract, and obtaining a precomputed ciphertext corresponding to the target state variable; computing, using the preset digest algorithm, based on the plurality of privacy-trigger sub-scripts and the ciphertexts of the plurality of privacy-trigger sub-scripts to obtain the target ciphertext; executing a decision-making script bytecode in the privacy-trigger sub-script to obtain an execution result if the target ciphertext is identical to the precomputed ciphertext; and performing a predetermined operation on the target state variable when the execution result indicates execution success.

Abstract: The present disclosure provides a consensus method and a consensus apparatus for a blockchain system. The consensus method includes: generating a subsequent proposal block by referencing a plurality of proposal blocks and combining current transactions from clients in an (n+x2)-th consensus round; and achieving consensus on the preceding proposal block by using the subsequent proposal block as a certificate for the preceding proposal block. The plurality of proposal blocks are correspondingly generated by the plurality of validation nodes referencing a preceding proposal block in an n-th consensus round, and the preceding proposal block is generated in an (n?x1)-th consensus round. In the consensus method of the present disclosure, there is no need to transmit a large amount of signature messages in the consensus process, and consensus on a specific block is achieved by establishing reference relationships between blocks generated in different consensus rounds.