Preparation method of cobalt-coated lithium ion battery anode material

A technology for lithium-ion batteries and positive electrode materials, which is applied in battery electrodes, circuits, electrical components, etc., can solve the problems of reduced capacity of positive electrode materials, poor material conductivity, etc., to slow down the loss of lithium, uniform material particles, high rate and high performance Effect of cycle life improvement

Inactive Publication Date: 2013-06-26
HUNAN SOUNDDON NEW ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The method of coating and modifying the positive electrode material of lithium manganate battery mainly includes: coating Al 2 o 3 , ZnO, TiO 2 , MgO, SnO 2 , CeO 2 Coated with organic matter, the conductivity of the coated material is poor, and requires high temperature treatment, it is easy to react with the internal lithium manganate, and the capacity of the positive electrode material is reduced

Method used

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  • Preparation method of cobalt-coated lithium ion battery anode material
  • Preparation method of cobalt-coated lithium ion battery anode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] ① Prepare 800kg of base lithium manganate, put it into a reaction kettle with high-speed stirring and jacket system, and prepare a lithium manganate slurry with a solid content of 180g / L with pure water.

[0025] ② Prepare a 2% molar cobalt sulfate solution according to the amount of lithium manganate, and use pure water to prepare a solution with a metal ion concentration of 50g / L of cobalt sulfate, that is, weigh 13.8kg of cobalt sulfate and prepare it as 110L cobalt sulfate solution .

[0026] ③ Prepare 85g / L sodium hydroxide solution with pure water.

[0027] ④ Prepare a 2mol / L ammonia (containing 1% hydrazine hydrate) solution.

[0028] Prepare the lithium manganate slurry, control the pH value at 10.10, the ammonia concentration at 5-8g / L, the temperature at 55±1℃, the stirring speed at 120r / min, and pass the metering pumps of ②solution, ③solution and ④solution simultaneously Feeding: ②The feeding rate of the dissolved cobalt sulfate solution is 1.0L / min. The feeding rat...

Embodiment 2

[0031] ① Prepare 800kg of lithium manganate as a substrate, put it into a reactor with high-speed stirring and jacket system, and prepare a lithium manganate slurry with a solid content of 160g / L with pure water.

[0032] ②Prepare a 3% molar cobalt sulfate solution according to the amount of lithium manganate, and use pure water to prepare a solution with a metal ion concentration of 50g / L of cobalt sulfate, that is, weigh 20.6kg of cobalt sulfate and prepare it as 160L cobalt sulfate Solution.

[0033] ③Prepare 100g / L sodium hydroxide solution with pure water.

[0034] ④ Prepare a 2mol / L ammonia (containing 1% hydrazine hydrate) solution.

[0035] The lithium manganate slurry is prepared, the pH value is controlled at 10.15, the ammonia concentration is 7-10g / L, the temperature is 60±1℃, the stirring speed is 120r / min, and the metering pumps for ②solution, ③solution and ④solution are passed simultaneously Feeding: ②The feeding rate of the dissolved cobalt sulfate solution is 1.0L / mi...

Embodiment 3

[0038] ① Prepare 800kg of lithium manganate as a substrate, put it into a reactor with high-speed stirring and jacket system, and prepare a slurry of lithium manganate with a solid content of 150g / L with pure water.

[0039] ② Prepare a 5% molar cobalt sulfate solution according to the amount of lithium manganate, and use pure water to prepare a solution with a metal ion concentration of 75g / L of cobalt sulfate, that is, weigh 34.3kg of cobalt sulfate and prepare it as 175L sulfuric acid Cobalt solution.

[0040] ③Prepare 120g / L sodium hydroxide solution with pure water.

[0041] ④ Prepare a 2.5mol / L ammonia (containing 1.5% hydrazine hydrate) solution.

[0042] The lithium manganate slurry is prepared, the pH value is controlled at 10.10, the ammonia concentration is 8-10g / L, the temperature is 62±1℃, the stirring speed is 120r / min, and the metering pumps for ②solution, ③solution, and ④solution are passed simultaneously Feeding: ②The feeding rate of the dissolved cobalt sulfate solu...

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Abstract

The invention discloses a preparation method of a cobalt-coated lithium ion battery anode material. The preparation method comprises the following steps of: coating Co(OH)2 on the surface of a lithium manganate matrix through chemical precipitation, wherein a complexing agent solution, a precipitant solution and a metal cobalt salt solution are added to a high-speed stirring reaction kettle, which is used for mixing up lithium manganate LiMn2O4 sizing agent, for carrying out a precipitation reaction; carrying out solid-liquid separating and drying into the discharged sizing agent after the cobalt precipitate is sufficiently reacted; carrying out high-temperature oxidation onto the materials by utilizing an oxidizing furnace under an oxygen atmosphere and a strong alkaline environment; carrying out pure water washing and solid-liquid separation onto the solid material after the oxidation reaction is completed; and obtaining the hydroxyl cobalt oxide-coated lithium manganate anode material after drying. The preparation method disclosed by the invention is low in device requirement, simple in process, good in material conductivity, long in cycle life, good in rate capability and high in capacity.

Description

Technical field [0001] The invention relates to a coating modification preparation method of lithium manganate material, in particular to lithium manganate LiMn coated with cobalt 2 O 4 .·XCoOOH preparation method. Background technique [0002] As a new generation of green and environmentally friendly power sources, lithium batteries have the advantages of high energy density and high discharge platform. They are widely used in mobile phones, cameras, notebook computers and other 3C and power tool electronic products. With the development of lithium battery technology, it is required to have the characteristics of high energy, high power and low cost. The cathode material of lithium battery is an important part of lithium battery and the main factor affecting the performance of lithium battery. The current commercial cathode material mainly includes LiCoO 2 , LiMn 2 O 4 , Li(NixCoyMnz)O 2 , Li(NixCoyALz)O 2 And LiFePO 4 , LiMn 2 O 4 Lowest price, higher safety, ordinary LiMn...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/62
CPCY02E60/10
Inventor 刘力玮商士波吴传勇其他发明人请求不公开姓名
Owner HUNAN SOUNDDON NEW ENERGY
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