31results about How to "Reduce residual lithium" patented technology

The invention discloses a modified high nickel ternary positive electrode material. The surface of a high nickel ternary positive electrode material is coated with a coating layer containing a fast ion conductor. The fast ion conductor has the chemical general formula of Li3x1La2/3-x1Ma1TiNz1O3, Li2+2x2Zn1-x2GeO4 or LiM'2(PO4)3, wherein M represents Ba<2+> and/or Sr<2+>, N represents Al<3+> and/orZr<4+>, x1 is greater than or equal to 0.04 and less than or equal to 0.167, a1 is greater than or equal to 0 and less than or equal to 1, z1 is greater than or equal to 0 and less than or equal to 1, x2 is greater than -0.3 and less than 0.8, and M' represents one or more of Zr, Ti, Ge and Hf. Compared with the existing positive electrode material, the modified high nickel ternary positive electrode material is provided with the coating layer containing the fast ion conductor and the coating layer can react with residual lithium on the surface of the material to reduce residual lithium on the surface of the material and inhibit side reactions of the residual lithium and the electrolyte so that material surface stability and cycle performances are improved. The modified high nickel ternary positive electrode material has good lithium ion deintercalation ability, improves the first discharge capacity of the material and first coulombic efficiency and has a good application prospect. The invention also discloses a preparation method of the modified high nickel ternary positive electrode material and a lithium ion battery.

The invention relates to a lithium nickel cobalt manganate positive electrode material and a preparation method thereof. The preparation method comprises the following steps of preparing seed crystalby adopting a hydrothermal method; performing a coprecipitation reaction on the seed crystal to obtain an Ni<x>Co<y>Mn<1-x-y>(OH)<2>, enabling the precursor to be mixed with lithium hydroxide or lithium carbonate at a molar ratio of Li to (Ni+Co+Mn) of 1:1-1.2, and next, performing sintering treatment on the mixture to obtain an intermediate body; enabling the intermediate body to be mixed with lithium hydroxide, and next, spraying metal sol to obtain a pre-coating material; and performing secondary sintering on the pre-coating material to obtain the lithium nickel cobalt manganate positive electrode material. The lithium nickel cobalt manganate positive electrode material prepared by the preparation method has the monocrystal appearance; and the lithium ion battery adopting the positive electrode material is high in energy density which can reach as high as 300wh/kg, and the cycle life can reach 3,000 times.

The invention relates to a lithium nickel cobalt manganate composite positive pole material and its preparation method and lithium battery and belongs to the technical field of lithium battery materials. The lithium nickel cobalt manganate composite positive pole material comprises lithium nickel cobalt manganate particles and lithium iron phosphate layers on the surfaces of the lithium nickel cobalt manganate particles. The lithium nickel cobalt manganate particles are lithium nickel cobalt manganate secondary particles. The lithium nickel cobalt manganate secondary particles are coated withlithium iron phosphate so that the surface pH of the lithium nickel cobalt manganate material is reduced, the residual lithium on the surface of the material is reduced, the problem that the existinglithium nickel cobalt manganate material adsorbs more water in slurry mixing is solved, the processing properties of the material are improved, the stability of the material during charging and discharging of the battery is improved and the circulation of the battery is improved.

The present invention relates to a high-nickel ternary positive electrode material coated with lithium iron phosphate nano-powder and a preparation method thereof. The preparation method comprises thefollowing steps: (1) mixing a nickel-cobalt-manganese precursor and a lithium source according to a certain lithiation ratio in mixing equipment to obtain a ternary precursor mixer; (2) calcining andgrinding the ternary precursor mixer obtained in step (1); preparing a polyethylene glycol solution, adding the lithium iron phosphate nano-powder into the solution, stirring until a gel is formed, immersing the high-nickel ternary material without being coated with the lithium iron phosphate into the gel, and continuously stirring to obtain a mixer; and (4) drying, allowing the lithium iron phosphate to be coated on the surface of the high-nickel ternary material, sintering the obtained dry material, and grinding to obtain the high-nickel ternary positive electrode material coated with the lithium iron phosphate. The high-nickel ternary positive electrode material coated with the lithium iron phosphate has excellent cycle stability and high rate capability, and thus the material is the potential application material of high-power and long-life lithium batteries.

The invention discloses a high-voltage lithium nickel-cobalt manganate cathode material and a preparation method thereof. The lithium nickel-cobalt manganate cathode material is lithium nickel-cobaltmanganate doping material coated with the phosphate, the lithium nickel-cobalt manganate doping material means that the lithium nickel-cobalt manganate doping material is doped with a lanthanum element and a fluorine element; the phosphate is prepared by mixing the aluminum phosphate and diammonium phosphate aqueous solution. The doping of the lanthanum element and the fluorine element can increase the interplanar spacing so as to promote the lithium ion migration and improving the structure stability; the material surface has good lithium ion conductivity feature and a certain electronic conductivity feature by coating the phosphate on the surface, so that the material has higher lithium-removing state stability under high voltage; the residual lithium quantity of the material surface isreduced, the surface side reaction is inhibited, and the structure stability and the cycle performance of the material under high voltage are obviously improved.

The present invention relates to a lithium metal complex oxide and a preparation method thereof, and more particularly, to a lithium metal complex oxide mixed with a metal compound for a lithium reaction, stirred and heat-treated to allow residual lithium and a metal compound for reducing lithium (or a metal compound for lithium reduction) to react with each other on a surface to form a product, which is included in the lithium metal complex oxide, in which the content of Ni³⁺ is higher than the content of Ni²⁺ and a ratio of Ni³⁺/Ni²⁺ is 1.5 or greater so that life characteristics and capacity characteristics are improved, while residual lithium is reduced, and a preparation method thereof.

The invention discloses a preparation method of a semi-doped and semi-coated NCA positive electrode material, and belongs to the technical field of positive electrode materials of non-aqueous electrolyte secondary batteries, the high-nickel NCA positive electrode material of LiOH is used, the process is redesigned, residual lithium of the positive electrode material can be obviously reduced, the capacity is increased, expansion of the battery is reduced, and the safety of the battery is improved; and the structural stability of the material is effectively improved through a semi-doping semi-coating and Si coating method, the electrolyte erosion resistance of the material is improved, and the capacity and circulation of the battery are further increased.

The invention provides a calcium phosphate coated high-nickel ternary positive electrode material as well as a preparation method and application thereof. The preparation method comprises the following steps: preparing a calcium source solution and a phosphorus source solution; adding the calcium source solution into an organic solvent or water, uniformly stirring, then adding a high-nickel ternary positive electrode material and the phosphorus source solution, and heating and drying to obtain powder; and calcining the powder to obtain the calcium phosphate coated high-nickel ternary positive electrode material. The high-nickel ternary positive electrode material is firstly coated with calcium phosphate and then sintered, so that residual lithium on the surface of the high-nickel ternary positive electrode material can be effectively reduced, side reaction between the residual lithium and electrolyte is reduced, and the storage performance of the high-nickel ternary positive electrode material is improved.