SVOLT ENERGY TECHNOLOGY CO., LTD.

The present disclosure provides a lithium-ion battery. The positive electrode plate and the negative electrode plate of the lithium-ion battery meet the following requirements: 0.4<(ln Ds) 2 /C D50 /(A OI ) 2 <18.2. By regulating the relationship between positive electrode and negative electrode of the lithium-ion battery, the dynamics of the positive and negative electrodes of the lithium-ion battery can achieve optimal matching in the fast charging process, ensure that the lithium-ion battery has a higher charging capacity, while ensuring that the lithium-ion battery has a good cycle life and safety when it is used for long-term fast charging.

The present application provides a lithium iron phosphate composite material, a preparation method and use. The lithium iron phosphate composite material includes a core and a shell coated on the core, in particular, the core is Li 6 MnO 4 , and the shell is carbon-coated lithium iron phosphate. The lithium iron phosphate composite material provided by the present application adopts Li 6 MnO 4 as the positive electrode lithium supplement material, and solves problems of active lithium loss and capacity depletion under high-rate charge and discharge of lithium iron phosphate positive electrode, thereby improving the rate performance of the lithium iron phosphate materials and the cycle life of batteries at high rates.

A lithium-rich carbonate precursor, a preparation method therefor, and an application thereof. The lithium-rich carbonate precursor has a solid spherical structure, and the chemical formula of the lithium-rich carbonate precursor is Ni x Co y Mn (1-x-y) CO 3 . The precursor has the advantages of having controllable particle size, uniform particle size distribution, high sphericity, high tap density, good fluidity, and excellent electrochemical performance and energy density.

Disclosed are an aluminum-coated precursor and a preparation method therefor. The aluminum coated precursor has a chemical formula of xMCO 3 (1-x)·Al(OH) 3 , wherein M is at least one of nickel, cobalt and manganese, and x is 0.995-0.999. The aluminum-coated precursor has the advantages of a controllable particle size and uniform particle size distribution, a high degree of sphericity, a smooth particle surface, a high tap density, not easily breaking, and an excellent electrochemical performance and energy density.

Provided is a power battery pack and electrical device. The power battery pack includes a support plate provided with pressure relief grooves, each of the pressure relief grooves is sequentially provided with a plurality of pressure relief cavities along a length direction thereof, and each of the pressure relief cavities is provided with at least one pressure relief hole on each side wall of two opposite sides of corresponding one of the pressure relief grooves; modules, each of the modules includes a plurality of battery cells arranged in sequence, each of the battery cells corresponds to one of the pressure relief cavities, and each of the battery cells is provided with an explosion-proof valve partially located in corresponding one of the pressure relief cavities.

Disclosed are a positive electrode plate, a preparation method therefor and the use thereof. The positive electrode plate comprises a current collector and an active substance layer formed on the current collector, wherein the active substance layer comprises a positive electrode active material, a conductive agent and a binder, with the binder comprising a polymer with the structural formula as shown in formula I, which polymer comprises chain segments a, b and c. The positive electrode plate not only has a low preparation cost, but can also significantly improve the high-temperature storage and high-temperature cycle performance of a lithium-ion battery.

A method and system for recovering NMP in lithium battery production including acquiring NMP waste gas discharged from a coating machine, and subjecting the NMP waste gas to a multi-stage condensation treatment. The method may additionally include, conveying the first-stage NMP gas to a zeolite runner for an adsorption and desorption treatment. In addition, in some embodiments, the method may include mixing the first-stage NMP waste liquid with the second-stage NMP waste liquid and subjecting the NMP recovered liquid to a multi-stage dehydration treatment to remove dehydrated light components, and extracting dehydrated heavy components. The method may additionally include, rectifying the dehydrated heavy components to remove rectified heavy components, extracting rectified light components, and acquiring an NMP finished product liquid via the rectified light components.

A battery includes a case, a post terminal and a pole group in the case. A first side of the case is provided with a first explosion-proof structure extending annularly. A part of the first side of the case located on an inner circumferential side of the first explosion-proof structure is a first separable portion covering a pressure relief opening of the case. The post terminal is on the first separable portion. A side of the pole group adjacent to the post terminal is connected to a connecting piece which includes a connecting portion connected to the pole group and a second separable portion separable from the connecting portion to expose a through opening in the connecting portion. The post terminal is connected to the second separable portion.

The present disclosure relates to the field of batteries, and provides an additive for supplementing lithium or sodium, a preparation method therefor and a use thereof. The additive is mainly prepared from Oxalic acid, a salt, and a catalyst; the salt comprises a lithium salt or a sodium salt; the particle size distribution concentration ratio of the additive for supplementing lithium or sodium satisfies the following expression: 1≤(D90−D10)/D50≤100; the specific surface area of the additive for supplementing lithium or sodium is S, and S and D10, D50 and D90 of the additive for supplementing lithium or sodium satisfy the following expression: 1≤(S/((D90−D10)/D50)≤100. The additive provided by the present disclosure is low in decomposition voltage, high in specific capacity, small in particle size, and low in catalyst consumption.

Provided in the present disclosure are a positive electrode material used for a lithium ion battery. The positive electrode material comprises substrate particles, a first coating layer that covers the substrate particles, and a second coating layer that covers the first coating layer; the substrate particles contain LiNi x Mn y Co z M 1-x-y-z O 2 ; the first cladding layer contains lithium cobalt oxide; and the second coating layer contains an oxide of a transition metal.