Method for preparing lithium-enriched cathodic material of lithium ion battery

A lithium-rich positive electrode material, lithium-ion battery technology, applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problems of poor electronic conductivity and ion conductivity, low initial charge and discharge efficiency of materials, and poor high-current discharge performance, etc. problems, to achieve the effect of improving the rate and cycle stability, small fluctuations in physical and chemical properties, and uniform coating

Inactive Publication Date: 2011-11-16
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0009] In addition, although lithium-rich materials Li[Li x mn y m (1-x-y) ]O 2 (00.5 Ni 0.5 or M=Mn x’ Ni y’ co (1-x’-y’) , 0

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  • Method for preparing lithium-enriched cathodic material of lithium ion battery
  • Method for preparing lithium-enriched cathodic material of lithium ion battery
  • Method for preparing lithium-enriched cathodic material of lithium ion battery

Examples

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Example Embodiment

[0024] Implementation example 1: Preparation of lithium-rich cathode material Li[Ni 0.2 Li 0.2 Mn 0.6 ]O 2 , Ie Li[Li x Mn y M (1-x-y) ]O 2 (x=0.2, y=0.2, M=Mn 0.5 Ni 0.5 ).

[0025] At room temperature, a certain amount of a mixture of nickel nitrate and manganese nitrate (wherein the ratio of nickel ions to manganese ions is 1:1) and ammonium oxalate are respectively dissolved in water. Drop the ammonium oxalate solution and the mixture solution evenly into the reactor, mix thoroughly, react, then seal the reactor and place it in an oven at 180°C, take it out after 12 hours, and cool it naturally to generate oxalate co-precipitation with uniform nickel and manganese distribution . The oxalate precipitate was washed several times with deionized water, filtered, and dried. Grind a certain amount of lithium carbonate from the dried precipitated powder uniformly, pre-fire at 450°C for 6 hours, press it into flakes after cooling, and calcinate at 850°C for 12 hours to obtain a lith...

Example Embodiment

[0029] Implementation Example 2: Preparation of lithium-rich cathode material Li[Li 0.2 Mn 0.54 Co 0.13 Ni 0.13 ]O 2 , Ie Li[Li x Mn y M (1-x-y) ]O 2 (x=0.2, y=0.4, M=Mn 0.5 Ni 0.5 Co 0.5 ).

[0030] At room temperature, a certain amount of a mixture of nickel sulfate, cobalt sulfate and manganese sulfate (wherein the ratio of nickel ion, cobalt ion and manganese ion is 1:1:1) and sodium oxalate are respectively dissolved in water. Drop the sodium oxalate solution and the mixture solution evenly into the reactor, mix them thoroughly, and react, then seal the reactor and place it in an oven at 200°C, take it out after 12 hours, and cool it naturally to produce a oxalate with uniform distribution of nickel, cobalt and manganese. precipitation. The oxalate precipitate was washed several times with deionized water, filtered, and dried. Grind a certain amount of lithium carbonate from the dried precipitated powder evenly, pre-fire at 500°C for 5 hours, press it into flakes after cool...

Example Embodiment

[0032] Implementation Example 3: Preparation of lithium-rich cathode material Li[Li 0.2 Mn 0.4 Co 0.2 Ni 0.2 ]O 2 , Ie Li[Li x Mn y M (1-x-y) ]O 2 (x=0.2, y=0.2, M=Mn 0.5 Ni 0.5 Co 0.5 ).

[0033] At room temperature, a certain amount of a mixture of nickel sulfate, cobalt sulfate and manganese sulfate (wherein the ratio of nickel ion, cobalt ion and manganese ion is 1:1:1) and sodium oxalate are respectively dissolved in water. Drop the sodium oxalate solution and the mixture solution into the reactor evenly, mix them thoroughly, and react, then seal the reactor and place it in an oven at 150°C. Take it out after 18 hours and cool it naturally to produce a oxalate with uniform distribution of nickel, cobalt and manganese. precipitation. The oxalate precipitate was washed several times with deionized water, filtered, and dried. Grind a certain amount of lithium carbonate from the dried precipitated powder uniformly, pre-fire at 550°C for 4.5 hours, press it into a sheet after co...

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Abstract

The invention provides a method for preparing a lithium-enriched cathodic material Li[LixMnyM(1-x-y)]O2(0 is less than x, y is less than 0.5, M is equal Mn0.5Ni0.5 or Mnx'Niy'Co(1-x'-y'), 0 is less than x', y' is less than 0.5), which comprises the following steps of: preparing a stable precursor by a hydrothermal auxiliary oxalate coprecipitation method, so that divalent manganese (II) can be prevented from being oxidized by air in solution, and obtaining solid solution of which metal elements such as Ni, Co, Mn and the like are distributed uniformly in an atomic level, so that the prepared lithium-enriched cathodic material has the high electrochemical activity; and wrapping a layer of graphene material with high conductivity on the surface of the lithium-enriched material uniformly to improve the magnification performance and circular stable performance of the lithium-enriched material obviously. In the method, the reaction process is not needed to be protected by inert gases, so the reaction is simplified and the cost is saved; the prepared lithium-enriched cathodic material is uniform in granules and high in electrochemical activity, and has the specific capacity of more than 250 mAh/g; the magnification performance and circular stable performance of the product is high; and the preparation is high in process repeatability, and the fluctuation of the physico-chemical performance of materials prepared by different batches is small.

Description

Technical field: [0001] The invention belongs to the fields of preparation of chemical power source materials and cathode materials of lithium ion batteries, and relates to a method for preparing cathode materials of lithium ion batteries. Background technique [0002] Lithium-ion batteries have the advantages of high energy density, long cycle life, light weight, and no pollution. They are a new generation of high-efficiency portable chemical power sources. Now it has been widely used in radio communications, digital cameras, notebook computers and space technology. With the further improvement of the energy density and power density of lithium-ion batteries, they will gradually be used in electric tools, electric bicycles, electric vehicles (EV), hybrid electric vehicles (HEV), and large-scale power storage. [0003] Cathode materials play a decisive role in the electrochemical performance, safety, and cost of lithium-ion power batteries, and their development has receive...

Claims

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Application Information

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IPC IPC(8): H01M4/1391
CPCY02E60/122Y02E60/12Y02E60/10
Inventor 吴锋苏岳锋卢华权包丽颖李宁陈实
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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