Lithium ion battery high-voltage anode material preparation and surface coating method

A technology for lithium-ion batteries and cathode materials, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as battery failure and scrapping, electrode charge and discharge capacity, and cycle reversible performance attenuation, so as to avoid specific capacity decline and suppress adverse reactions , Enhance the effect of charge resistance

Inactive Publication Date: 2011-04-06
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Including LiNi 0.5 mn 1.5 o 4 In general, all electrode materials generally face a common problem: as the number of cycles increases, the charge-discharge capacity and cycle reversibility of the electrode will gradually decay, eventually leadi

Method used

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  • Lithium ion battery high-voltage anode material preparation and surface coating method
  • Lithium ion battery high-voltage anode material preparation and surface coating method
  • Lithium ion battery high-voltage anode material preparation and surface coating method

Examples

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Effect test

Embodiment 1

[0027] Dissolve nickel acetate (12.69g) and manganese acetate (37.135g) in dehydrated ethanol respectively to prepare a solution; dissolve citric acid (42.028g) in dehydrated ethanol; mix the above three solutions, stir for 4h to mix evenly, Then it was dried at 70°C to form a sol, and then dried at 100°C to form a gel, and then calcined at 350°C for 4 hours in the air to obtain nickel-manganese oxide powder. Nickel manganese oxide and lithium carbonate were weighed in a molar ratio of 1:1.1, added to absolute ethanol for ball milling and mixing for 5 hours, dried at 100°C, and heat-treated at 400°C in air for 12 hours. The resulting product is analyzed by X-ray diffraction, and the product is spinel LiNi 0.5 mn 1.5 o 4 .

Embodiment 2

[0029]Dissolve nickel sulfate (13.143g) and manganese sulfate (25.3515g) in deionized water respectively to prepare a solution; dissolve citric acid (42.028g) in deionized water; mix the above three solutions, stir for 4h to mix evenly, and then 80 ℃ to dry into a sol, then dried to a gel at 100°C, and then calcined at 350°C in air for 4 hours to obtain nickel-manganese oxide powder. Nickel manganese oxide and lithium carbonate were weighed in a molar ratio of 1:1.1, added to absolute ethanol for ball milling and mixing for 5 hours, dried at 100°C, and heat-treated at 400°C in air for 12 hours. The resulting product is analyzed by X-ray diffraction, and the product is spinel LiNi 0.5 mn 1.5 o 4 .

Embodiment 3

[0031] Dissolve nickel nitrate (14.5405g) and manganese nitrate (37.6515g) in dehydrated ethanol respectively to prepare a solution; dissolve citric acid (42.028g) in dehydrated ethanol; mix the above-mentioned 3 kinds of solutions, stir for 4h to mix well, Then it was dried at 70°C to form a sol, and then dried at 100°C to form a gel, and then calcined at 350°C for 4 hours in the air to obtain nickel-manganese oxide powder. Nickel manganese oxide and lithium carbonate were weighed in a molar ratio of 1:1.1, added to absolute ethanol for ball milling and mixing for 5 hours, dried at 100°C, and heat-treated at 400°C in air for 12 hours. The resulting product is analyzed by X-ray diffraction, and the product is spinel LiNi 0.5 mn 1.5 o 4 .

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Abstract

The invention provides lithium ion battery high-voltage anode material preparation and surface coating method. The method adopts high-voltage anode material spinel-type LiNi0.5Mn1.5O4 prepared by a two-step method and comprises the following steps of: firstly, evenly mixing nickel source and manganese source solutions with a surface active agent solution, then drying and roasting in the air of 350-450 DEG C to obtain a precursor of a nickel and manganese oxide; mixing the precursor with a lithium source through liquid phase ball milling, drying and finally roasting in the air of 400-900 DEG Cto obtain an anode active material; and adding the anode active material to a soluble aluminum solution containing a lithium source, sufficiently and evenly mixing under controlling the lithium source, the soluble aluminum source and the anode active material to be at the proper mol, drying and carrying out high-temperature roasting treatment to obtain a final product which is the lithium ion battery high-voltage anode material which is coated with a layer of lithium-contained transition metal oxide on the surface. The high-voltage anode material prepared by the method has the characteristicsof high initial capacity, good cycle performance and the like.

Description

technical field [0001] The invention belongs to the field of material synthesis, and in particular relates to a lithium-ion battery cathode material and a preparation method thereof, in particular to a high-voltage lithium-ion battery surface-coated cathode material and a preparation method thereof. technical background [0002] Lithium-ion secondary batteries have higher energy density than other rechargeable battery systems, and their applications range from various portable electronic devices to zero-emission electric vehicles. At present, more positive materials for lithium-ion batteries have been studied, including LiCoO with a layered structure. 2 , LiNiO 2 , LiMn with spinel structure 2 o 4 , and LiFePO with olivine structure 4 . The voltage of the above-mentioned positive electrode materials relative to the graphite negative electrode is lower than 4V, and the power of the battery is limited to a certain extent. If it is used in an electric vehicle, multiple bat...

Claims

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Application Information

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IPC IPC(8): H01M4/139H01M4/505H01M4/525H01M4/131
CPCY02E60/12Y02E60/122Y02E60/10
Inventor 王珍珍杨茂萍刘大军徐小明
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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