37results about How to "High lithium content" patented technology

The invention discloses a lithium flow battery reactor and an electrode suspension liquid lithium intercalated synthesis method. The battery reactor is formed by fixing one or more assembled structures respectively consisting of a negative current collection core, a lithium negative electrode, a hollowed bushing, a porous diaphragm and a positive current collection core in a reaction tank. Lithium intercalation is performed on electrode suspension liquid by utilizing the battery reactor in an electrochemical synthesis way, the electrode suspension liquid is injected into the reaction tank, lithium ions which are separated from the lithium negative electrode in the reaction tank are finally intercalated into active material particles of the electrode suspension liquid, and the electrochemical synthesis process and the lithium intercalation degree of the electrode suspension liquid in the reaction tank are controlled by adjusting the flow rate, the voltage and the circular reaction times of the electrode suspension liquid. Due to the adoption of the method, a stable lithium-enriched electrode material or a metastable-phase lithium-containing alloy with high electric capacity can be obtained, and the energy density and the cycle life of a battery can be improved.

The invention belongs to the technical field of lithium metal batteries, and discloses a method for preparing a lithium metal negative electrode of a lithium-friendly three-dimensional carbon-based current collector, comprising the steps of: first self-assembling a one-dimensional nanometer material and an organic material to obtain a three-dimensional precursor framework material; Then, the three-dimensional precursor framework material is subjected to high-temperature carbonization treatment to prepare a lithium-friendly three-dimensional carbon-based current collector with good wettability to liquid metal lithium; the metal lithium is heated to 180°C to 500°C to obtain liquid metal lithium, and the liquid metal Lithium is mixed with a lithium-friendly three-dimensional carbon-based current collector, and after being fully infiltrated by liquid metal lithium, it is naturally cooled to form a composite lithium metal negative electrode. Compared with the lithium sheet negative electrode, the composite lithium metal negative electrode prepared by the present invention can greatly inhibit the growth of lithium dendrites, relieve the volume expansion effect of the lithium negative electrode during the deposition / stripping process, and realize the long life and high stability of lithium metal cycle.

The invention provides a method for preparing a lithium ion sieve adsorbent, comprising: using an aqueous solution of lithium salt and manganese salt as a raw material, using microwaves and ultrasonic waves to obtain a co-precipitation product, and then roasting the co-precipitation product to obtain lithium ions The sieve precursor is finally obtained by acid leaching the lithium ion sieve precursor. The method of the present invention uses the mixed aqueous solution of lithium salt and manganese salt as raw material, produces precipitation under the joint action of microwave and ultrasonic wave, and then obtains a lithium ion sieve precursor with ideal structure through roasting, which has high purity and high lithium content. The lithium ion sieve adsorbent finally obtained after the treatment of the ion sieve precursor has a stable structure and high adsorption capacity, and the method of the present invention consumes less time and energy and has high controllability, which is of great significance to the recycling and utilization of lithium metal resources.

The invention discloses a method for recycling the negative electrode material of the waste lithium ion battery. The basic steps are as follows: 1) Mix the waste lithium-ion battery negative electrode powder with the molten salt; 2) Heat-treat the mixed powder at a temperature not lower than the melting point of the molten salt; 3) After the heat treatment, immerse the material in water and stir evenly for solid-liquid Separation, the liquid phase is used to extract lithium and the recovery of other valuable metals, and the solid phase is regenerated negative electrode material after drying. The invention realizes the purification and structure restoration of the negative electrode material in the waste lithium ion battery negative electrode material, and the recovery of valuable metals. The method has the advantages of short processing flow, low cost, high purity and good crystallinity of the obtained regenerated negative electrode material, high leaching rate of valuable metals, and is suitable for large-scale production.

The invention relates to a lithium metal negative electrode and its preparation and application. The lithium metal negative electrode is based on lithium metal, and the surface facing the positive electrode is coated with a solid lithium salt layer and a polymer electrolyte layer in sequence, and is applied in a lithium metal battery. , will form an electrolyte system with a gradient distribution of lithium ion concentration from low to high from the positive electrode to the negative electrode. This electrolyte with gradient distribution of lithium ions can not only effectively solve the problems of low ionic conductivity and high interfacial contact resistance in solid electrolytes, but also effectively improve the poor stability of SEI films in liquid electrolytes, inhibit the growth of lithium dendrites, and improve the performance of lithium batteries. Cyclic stability has important practical application value.

A lithium titanate product, the formula of which is in the form of LixTiyOz, and wherein y is 1, the x:y molar is 1.1-1.8, while the z:y molar ratio is 2.0-4.5. Also disclosed is a method of preparing alkali metal titanates, such as lithium titanate, at a low temperature of below 100° C., from an aqueous titanium-containing slurry and an alkali metal compound.

The invention discloses a low-sodium aluminium-lithium intermediate alloy material and its preparation method. The low-sodium aluminium-lithium intermediate alloy material contains, by weight, 8.0-25.0% of Li, less than or equal to 0.0001% of Na, less than or equal to 0.00005% of K and the balance Al. According to the preparation method, a mixed salt of pure lithium chloride and lithium fluoride is used as a covering agent; boron trioxide is used to remove sodium and potassium; and high-pure nitrogen or argon is used for gas refining. The melting operation process requires no inert gas or vacuum protection. The technology is simple. After the sodium removal technological process, the contents of sodium and potassium impurity in the alloy are low, wherein the mass fraction of sodium is less than or equal to 0.0001% and the mass fraction of potassium is less than or equal to 0.00005%. The technological method has advantages of high yield and little loss of raw materials, and can be adopted for quantitative preparation of the aluminium-lithium intermediate alloy with any lithium content.

An alkaline storage battery system according to an aspect of the present invention, with which a partial charging-discharging is performed, includes an alkaline storage battery 10 including an electrode group having a nickel positive electrode 11, a hydrogen storage alloy negative electrode 12, a separator 13; an alkaline electrolyte; and an outer can 14 accommodating the electrode group and the alkaline electrolyte, and further includes a partial charge-discharge control unit for controlling charging-discharging of the battery 10. In addition, zinc (Zn) is added to nickel hydroxide that is a main positive electrode active material in the nickel positive electrode 11 with an addition amount of 5% by mass or less with respect to the mass of nickel in the positive electrode active material. The concentration of the alkaline electrolyte is 6.5 mol / L or less and the content of lithium in the alkaline electrolyte is 0.3 mol / L or more.