5results about How to "Prevent co-embedding" patented technology

The present invention relates to the technical field of sodium ion batteries, and in particular to a sodium ion battery composite electrolyte and a sodium ion battery. The composite electrolyte comprises electrolyte A and electrolyte B, wherein electrolyte A comprises sodium salt, ether solvent and ester solvent, and electrolyte B comprises sodium salt and ester solvent, wherein electrolyte A accounts for 70-95% of the total mass of the composite electrolyte, and electrolyte B accounts for 5-30% of the total mass of the composite electrolyte. Ether solvents are conducive to realizing the wetting effect of the composite electrolyte on the sodium ion battery, and the products completely decomposed in the first charge are used as part of the SEI film on the surface of the negative electrode, thereby improving the first effect of the negative electrode, and at the same time improving the battery cycle performance and the oxidation resistance of the electrolyte, reducing the cycle gas production, and further improving the oxidation resistance of the composite electrolyte and the working performance of the sodium ion battery. Ester solvents can provide high voltage stability, fully activate the sodium ion battery, and synergize with ether solvents to enhance the various working performances of the sodium ion battery.

The invention provides an electrolyte and application thereof, and belongs to the technical field of electrolytes for batteries. Comprising a lithium salt, a solvent and an additive, the additive comprises halogenated naphthalene, the chemical formula of the halogenated naphthalene is represented as CxHyXz, X is halogen, x, y and z are positive integers or 0, 2x + 1 = y + z, and the mass percentage content of the halogenated naphthalene in the electrolyte is not less than 0.01%. When the electrolyte is used for the battery, the electrolyte has good cyclicity and stable cyclicity, and application and stable circulation of solvents such as propylene carbonate and the like which are co-embedded with graphite in the lithium ion battery can be realized.

The present application provides a secondary battery, a battery module, a battery pack and an electrical device thereof. The secondary battery comprises a negative electrode plate and an electrolyte, wherein the negative electrode plate contains a negative electrode active material, wherein the negative electrode active material comprises a core and a coating layer containing an antimony element disposed on the surface of the core; the electrolyte contains a lithium salt and a fluorine-containing additive, wherein the fluorine-containing additive is a fluorine-containing ester monocyclic compound; wherein the molar ratio of the antimony element to the fluorine-containing additive is 1:20 to 10:1, and optionally 0.9:10 to 6:10. In the present application, by using the above-mentioned secondary battery, it is helpful to form a SEI film with a high LiF content on the negative electrode plate, which can effectively prevent the co-embedding of solvent molecules, avoid the damage to the negative electrode material caused by the co-embedding of solvent molecules, reduce the decomposition of the solvent in the electrolyte, and improve the cycle performance and extend the life of the secondary battery.

This invention discloses a dual-ion battery based on a MOF-on-MOF framework anode material and a high-concentration dual-lithium salt electrolyte. The invention prepares spherical graphene oxide-modified ZnMnBTC@ZIF-67MOF-on-MOF framework material (ZnMnGO-MOF@GO) via a simple hydrothermal reaction, using it as the anode material in conjunction with a graphite cathode and a dual-lithium salt electrolyte to design a high-performance dual-ion battery. This energy storage system utilizes widely available raw materials, has a simple synthesis method, and exhibits excellent cycle stability, capable of stable cycling for 7000 cycles, providing a new perspective for the design of high-capacity, large-scale-application dual-ion batteries.

The invention discloses a silicon-carbon composite particle, a preparation method and application thereof, the silicon-carbon composite particle comprises a silicon-carbon particle and an artificial SEI film, the artificial SEI film continuously and compactly coats the surface of the silicon-carbon particle, the D50 of the silicon-carbon composite material is 5-14 [mu] m, and the artificial SEI film material comprises at least one of F, O, C, S and N; a three-dimensional fibrous network structure capable of connecting the adjacent silicon-carbon composite particles exists between the adjacent silicon-carbon composite particles. The silicon-carbon composite particle comprises the artificial SEI film, volume expansion of silicon can be effectively relieved, the dynamic performance of the battery is improved, the cycle life of the battery is prolonged, and the first effect of the battery is improved.