45results about How to "Inhibition of dendrite growth" patented technology

The invention relates to a preparation method of a high-safety metal composite negative electrode. The preparation method comprises the following steps: (a) heating metal lithium to a fused state under the protection of inert gas; (b) adding an inorganic non-metal compound into the metal lithium with the fused state; after stirring and reacting, cooling, wherein the inorganic non-metal compound isselected from one or a mixture of more of sulfide, phosphide, nitride and fluoride, and the mass ratio of the metal lithium to the inorganic non-metal compound is (10 to 3) to 1. According to the preparation method, a compound protection layer can be formed on a lithium negative electrode so that electrolyte and a lithium sheet are effectively isolated and the lithium sheet is prevented from corrosion and reaction; uniform distribution of lithium ions is realized and lithium dendrites are prevented from being generated; a framework supporting effect is provided.

The invention relates to a lithium metal negative electrode with a double-layer interface film, preparation of the lithium metal negative electrode, and application. The double-layer interface film isattached to the surface of lithium metal; the inner layer of the double-layer interface film is a lithium fluoride inorganic layer; the outer layer of the double-layer interface film is an ether polymer layer. When the interface film is applied to a lithium metal battery, the inner-layer compact film of the interface film can inhibit dendrite growth on the surface of lithium metal, the outer-layer flexible film of the interface film can effectively relieve the breakage of the lithium fluoride layer caused by the volume expansion of a negative electrode, and therefore, interface stability is improved, continuous reaction and consumption of the lithium negative electrode and an electrolyte are inhibited, and the cycle life of the battery is prolonged. In addition, due to the introduction oforganic lithium salt into the interface film, interface lithium ion transmission is greatly accelerated, and lithium deposition uniformity is improved.

The invention relates to a lithium sulphur battery which comprises an anode, an cathode, an electrolyte and a membrane, wherein the anode comprises anode active materials selected from lithium metal, lithium alloys and lithium carbons and an anode current collector, the cathode comprises cathode active materials and a cathode current collector, the cathode active materials comprise at least one kind of sulfur compound selected from sulfur and organic sulfur compounds, the electrolyte comprises lithium salt and a mixed organic solvent, the membrane is arranged between the cathode and the anode so as to separate the electrolyte into an anode electrolyte and a cathode electrolyte and allows the lithium ion to pass through, and the cathode active materials are carbon-sulfur with a nano structure. The cathode material can avoid the wastage of an intermediate reaction compound of the sulfur effectively, so that the cycle life of the lithium sulphur battery is prolonged and the power density of the lithium sulphur battery is increased.

The present invention provides a secondary battery that includes a metal ion receptor, which can absorb metal dendrites generated on the surface of a cathode while the battery is used, in a battery cell, whereby it is possible to improve safety by suppressing growth of dendrites and preventing a short due to a dendrite by making metal dendrites be absorbed in the metal ion receptor before the dendrites growing on the surface of the cathode reach the surface of an anode.

The invention provides a solid polymer electrolyte comprising a three-dimensional graphene oxide network and a polymer and lithium salt electrolyte filled in the three-dimensional graphene oxide network; The polymer is one or more of PEO, PAN, PVDF, PMMA and PVDF-HFPs; The lithium salt electrolyte is one or more of LiTFSI, LiPF6 and LiCIO4; The polymer has an electron donating functional group, and the molar ratio of the electron donating functional group to lithium ions in the lithium salt is (1-10): 1. The three-dimensional graphene oxide network surface of the invention can form a continuous amorphous region, which is favorable for lithium ion transmission and improves the ionic conductivity of the solid polymer electrolyte. The prepared polymer electrolyte has high ionic conductivity,good mechanical strength and excellent safety performance. The invention also provides a preparation method of a solid polymer electrolyte and a lithium ion battery.

The invention provides a negative electrode current collector. The negative electrode current collector comprises a current collector base material and an induction layer covering the surface of the current collector base material, the induction layer is used for inducing metal deposition, and the invention also provides a preparation method and application of the negative electrode current collector. The method is suitable for the secondary battery taking various metals (lithium, sodium, magnesium, aluminum, potassium and zinc) as negative (positive) active substances. By using the current collector (negative electrode) provided by the invention, dendritic crystal growth on the negative electrode of the battery and side reaction between active metal and electrolyte can be effectively inhibited, the safety and the cycle efficiency of the secondary battery are improved, and the cycle life of the secondary battery is prolonged.

The invention discloses a preparation method and an application of a high-strength solid-state composite electrolyte film, and belongs to the technical field of a lithium secondary battery electrolyte. The solid-state composite electrolyte is composed of a high-strength fiber porous membrane, an oxide solid-state electrolyte limited in a fiber structure, a lithium salt and an infiltrated polymer electrolyte. According to the method, a high-strength ceramic composite fiber porous membrane is prepared by adopting an electrostatic spinning process, and the composite electrolyte is prepared by taking the porous membrane as a supporting structure and adopting a polymer-lithium salt liquid infiltration process. The prepared composite electrolyte shows excellent mechanical strength, high ionic conductivity, a wide electrochemical stability window and good thermal stability. The method is low in cost and simple in process, the prepared film is compact and uniform, and commercialized production is facilitated. The invention also discloses the application of the solid-state composite electrolyte film in the aspect of all-solid-state lithium batteries, the solid-state composite electrolyte film has excellent safety and a reversible capacity, and a new way is opened up for a practical application of the all-solid-state lithium batteries.

The invention discloses a preparation method of a long-cycle-life aqueous zinc secondary battery negative electrode, and belongs to the technical field of zinc secondary batteries. The preparation method comprises the following steps: firstly, carrying out chemical replacement reaction on zinc and metal salt to deposit a metal simple substance on the zinc metal surface and further to obtain a zincmetal surface covered solid electrolyte precursor; covering a solid electrolyte precursor on the surface of zinc metal to serve as a negative electrode to assemble a battery; and after the solid electrolyte precursor material is subjected to in-situ electrochemical cycle activation, generating solid electrolyteon the surface of zinc metal in situ, and obtaining the zinc secondary battery negativeelectrode material. The obtained zinc/solid electrolyte electrode has a large actual electrochemical active area and high mechanical stability, and meanwhile, the solid electrolyte isolates zinc metal from liquid electrolyte, so that the defects of active metal corrosion, surface passivation, dendritic crystal growth and the like of a traditional zinc metal electrode are inhibited, and the cycling stability of an electrode material is improved.

The invention provides a graphene quantum dot modified electrolyte and a preparation method thereof, and belongs to the field of lithium metal battery electrolytes. By adding graphene quantum dots anda polymer in the commercial electrolyte, the graphene quantum dots can continuously provide nucleation sites, and the polymer enables uniform dispersion of the graphene quantum dots in the electrolyte, thereby obtaining simple process and obviously improving cycling and multiplying performance of lithium metal batteries under operating conditions of high current and high capacity. When the lithium metal batteries in the graphene quantum dot modified electrolyte have a current density reaching 4mA/cm2 and a cycling capacity reaching 4mAh/cm2, there is still no short circuit caused by lithium dendrites, and good charging and discharging performance is kept, thereby having potential application in the field of lithium metal batteries, and realizing the purpose of lithium negative protectionunder high current and high capacity.

The invention provides an interface protection structure which comprises a main body material, wherein the main body material is a carbon-based material and comprises at least one of foam graphene (FG), carbon nanotubes (CNT) and carbon fibers. The interface protection structure is prepared by dispersing raw materials in a dispersion liquid, and then, performing suction filtration and stripping. The interface protection structure is a self-supporting structure and is formed without the help of a binder, has a certain flexibility and can be further applied to a flexible battery, can suppress dendrite growth and volume change of a lithium metal battery in the charging and discharging process and block direct contact between electrolyte and lithium metal, and improves coulombic efficiency andcycle life of the battery. The preparation raw materials of the interface protection structure are easy to obtain, and the preparation method is simple and easy to implement; the interface protectionstructure can be directly applied to existing lithium metal battery products; and large-scale popularization is facilitated.

Provided is a material capable of further extending the life of a cell including a zinc species as a negative electrode active material. The present invention relates to an anion conducting membrane formed using an anion conducting membrane-forming material, the anion conducting membrane-forming material including a conjugated diene based polymer and/or a (meth)acrylic based polymer, and a compound containing at least one element selected from Groups I to XVII of the periodic table, the anion conducting membrane having a cross-section in which a ratio of a combined area of particles of the compound containing at least one element selected from Groups I to XVII of the periodic table to a combined area of the components of the anion conducting membrane-forming material other than the compound (particles of the compound/components of the anion conducting membrane-forming material other than the compound) is 70/30 to 30/70.

The invention discloses a preparation method and application of a dynamic interface coating of a metal zinc negative electrode of a zinc ion battery, and belongs to the technical field of energy materials. The surface of the metal zinc negative electrode of the zinc ion battery is modified with the interface layer dynamically adapting to the interface volume change through a spin coating method, and the synthesized polymer PDMS has extremely high viscoelastic characteristics and shows high dynamic adaptive capacity. And the prepared TiO<2-x> is rich in oxygen vacancies. The prepared dynamic interface coating can be applied to an aqueous zinc ion battery. The PDMS/TiO<2-x> interface coating dynamically adaptive to volume change is prepared, dendritic crystal growth is inhibited through dynamic buffer volume change, and meanwhile, the ionic conductivity of the interface layer is further improved through rapid and uniform transfer of Zn < 2 + > induced by rich oxygen vacancies, so that the Zn metal surface is stabilized, the utilization rate of a battery is increased, and the cycle life of the battery is prolonged.

The invention relates to the field of advanced inorganic non-metallic materials, in particular to a battery diaphragm, and more particularly relates to an aqueous zinc metal battery MXene-based diaphragm as well as a preparation method and application thereof. The invention provides the aqueous zinc metal battery MXene-based diaphragm as well as the preparation method and application thereof in order to solve the problems of dendritic crystal growth and poor cycle stability in long-term use of an existing aqueous zinc battery. Research finds that relatively good cycling stability cannot be realized by simply improving electrolyte components, so that the MXene colloidal solution is modified on the diaphragm, the nucleation barrier is effectively reduced, the zinc deposition is uniform, the volume change is buffered and the ion transmission is accelerated in the battery system.

The invention provides an electrolyte and a preparation method and application thereof. The electrolyte comprises electrolyte salt, a diluent and an ionic liquid solvent; the diluent is a fluorine-containing ether compound which does not dissolve the electrolyte lithium salt but is mutually soluble with the ionic liquid solvent; the ionic liquid solvent is nitrogen heterocyclic ring ionic liquid. The electrolyte is based on a lossless electrostatic shielding mechanism; a local high-concentration lithium salt system formed by matching the ionic liquid with the diluent has the effects of effectively controlling uniform deposition of lithium and inhibiting self-amplification growth of dendrites; the lithium dendrite inhibition effect can be maintained in the long cycle of the battery; the effects of protecting the metal lithium negative electrode, prolonging the cycle life of the battery and improving the safety are obvious.

The embodiment of the invention provides a metal negative electrode. The metal negative electrode comprises a metal negative electrode body and a protective layer formed on the surface of one side ortwo sides of the metal negative electrode body, the single ion conductor polymer alkali metal salt comprises a polymer skeleton and sulfonyl imide rubidium salt or sulfonyl imide cesium salt grafted on the polymer skeleton through a chemical bond. In the charging and discharging process of the battery, alkali metal cations in the alkali metal salt of the single-ion conductor polymer can constructa local high-concentration positive charge electrostatic electric field on the surface of the negative electrode, so that an electric field shielding effect is achieved, uniform metal ion flow is guided, and dendritic crystal growth is inhibited; and meanwhile, the protective layer can effectively relieve volume expansion of the metal negative electrode in the circulation process, stabilize a negative electrode interface, isolate direct contact between electrolyte and the metal negative electrode, reduce side reaction and improve coulombic efficiency of the negative electrode. The embodiment of the invention also provides a preparation method of the metal negative electrode, an electrochemical battery and a terminal.

Electrolyte-infiltrated composite electrode includes an electrolyte component consisting of a polymer matrix with ceramic nanoparticles embedded in the matrix to form a networking structure of electrolyte. Suitable ceramic nanoparticles have the basic formula Li₇La₃Zr₂O₁₂ (LLZO) and its derivatives such as Al_xLi_7-xLa₃Zr_2-y-zTa_yNb_zO₁₂ where x ranges from 0 to 0.85, y ranges from 0 to 0.50 and z ranges from 0 to 0.75, wherein at least one of x, y and z is not equal to 0. The networking structure of the electrolyte establishes an effective lithium-ion transport pathway in the electrode and strengthens the contact between electrode layer and solid-state electrolyte resulting in higher lithium-ion electrochemical cell's cycling stability and longer battery life. Sold-state electrolytes incorporating the ceramic particles demonstrate improved performance. Large dimensional electrolyte-infiltrated composite electrode sheets can be used in all solid-state lithium electrochemical pouch cells which can be assembled into battery packs.

The invention provides a coating diaphragm as well as a preparation method and application thereof. The coating diaphragm comprises a diaphragm substrate and a coating arranged on at least one surface of the diaphragm substrate, and the material of the coating comprises a combination of a binder and delaminated hydrotalcite containing an anionic fixing structure. The preparation method of the coating diaphragm comprises the following steps of uniformly mixing the delaminated hydrotalcite containing the anion fixed structure, the binder and the organic solvent to obtain coating slurry; and coating at least one surface of the diaphragm substrate with the obtained coating slurry, and drying to obtain the coating diaphragm. The coating diaphragm provided by the invention is applied to a lithium secondary battery, so that the growth of lithium dendrites can be effectively inhibited, and the coating diaphragm has an important application value.