Preparation method of silicon-coated lithium ion battery anode material

A technology for lithium-ion batteries and cathode materials, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of reduced material capacity, poor material conductivity, high processing temperature, etc., and achieve uniform particle distribution, low processing temperature, and uniform particles Effect

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

[0004]The method of coating and modifying the positive electrode material of lithium manganate battery mainly includes: coating Al2O3, ZnO, TiO2, MgO, Sn O2, CeO2 and organic coating, mostly metal oxide coating, coating The post-coating treatment temperature is high, the electrical conductivity of the coated material is poor, the material capacity is reduced, and the coating is easy to form doping with lithium manganate inside.

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] ①Prepare 800kg of lithium manganate matrix, put it into a reaction kettle with high-speed stirring and jacket system, and prepare a slurry with pure water with a solid content of 160g / L.

[0026] ②According to the amount of lithium manganate, prepare 3% SiO containing its molar amount 2 A solution of sodium silicate, SiO 2 The mass concentration is 5.3%, that is, weigh Na 2 O.·3.1SiO 2 Powder 10.6kg, prepared as 150 liters of solution.

[0027] ③ Dilute sulfuric acid with pure water to prepare a solution with a mass concentration of 3%.

[0028] Prepare the lithium manganate slurry, the pH value is controlled at 9.5, the temperature is 70±2°C, the stirring speed is 120r / min, and the ②solution and ③solution metering pumps are used to feed simultaneously, ②The feeding speed of the solution sodium silicate 1.0L / min, the pH value of the system is controlled at 9.4~9.6, after the sodium silicate reaction is completed, the material is discharged, the slurry is separated f...

Embodiment 2

[0030] ① Prepare 800kg of lithium manganate matrix, put it into a reaction kettle with high-speed stirring and jacket system, and prepare a slurry with pure water, with a solid content of 180g / L.

[0031] ②According to the amount of lithium manganate, prepare 4% SiO containing its molar amount 2 A solution of sodium silicate, SiO 2 The mass concentration is 5.3%, that is, weigh Na 2 O.·3.1SiO 2 Powder 14.13kg, prepared as 200 liters of solution.

[0032] ③ Dilute sulfuric acid with pure water to prepare a solution with a mass concentration of 3%.

[0033] Prepare the lithium manganate slurry, the pH value is controlled at 9.6, the temperature is 75±2°C, the stirring speed is 120r / min, and the ②solution and ③solution metering pumps are used to feed simultaneously, ②The feeding speed of the solution sodium silicate 1.5L / min, the pH value of the system is controlled at 9.5~9.7, the sodium silicate is discharged after the reaction is completed, the solid-liquid separation is c...

Embodiment 3

[0035] ①Prepare 800kg of lithium manganate matrix, put it into a reaction kettle with high-speed stirring and jacket system, and prepare a slurry with pure water with a solid content of 180g / L.

[0036] ②According to the amount of lithium manganate, prepare 5% SiO containing its molar amount 2 A solution of sodium silicate, SiO 2 The mass concentration is 6.6%, that is, weigh Na 2 O.·3.1SiO 2 Powder 17.7kg, prepared as 200 liters of solution.

[0037] ③ Dilute sulfuric acid with pure water to prepare a solution with a mass concentration of 3%.

[0038] Prepare the lithium manganate slurry, the pH value is controlled at 9.5, the temperature is 70±1°C, the stirring speed is 150r / min, and the ②solution and ③solution metering pumps are used to feed simultaneously, ②The feeding speed of the solution sodium silicate 1.5L / min, the pH value of the system is controlled at 9.4~9.6, after the sodium silicate reaction is completed, the material is discharged, the slurry is separated f...

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Abstract

The invention discloses a preparation method of a silicon-coated lithium ion battery anode material. The preparation method comprises the following steps of: coating SiO2.nH2O on the surface of a lithium manganate matrix through chemical precipitation, wherein a low-sodium sodium silicate solution and a sulfuric acid solution are added to a high-speed stirring reaction kettle, which is used for mixing up lithium manganate LiMn2O4 sizing agent, for carrying out precipitation reaction; washing the discharged sizing agent after the silicon precipitate is sufficiently reacted; and drying at 100 DEG C to 150 DEG C after the solid-liquid separation to obtain the silicon dioxide-coated lithium manganate anode material. The preparation method disclosed by the invention is low in device requirements, simple in process and environment-friendly. And the anode material is long in cycle life and low in cost.

Description

technical field [0001] The invention relates to a preparation method for coating and modifying a positive electrode material of a lithium battery, in particular to a preparation method for a silicon-coated lithium manganate battery. Background technique [0002] As a new generation of green and environmentally friendly power supply, lithium batteries have the advantages of high energy density and high discharge platform, and are widely used in 3C and power tool electronic products such as mobile phones, cameras, and notebook computers. With the development of lithium battery technology, it is required to have the characteristics of high energy, high power, high cycle life and low cost. [0003] The positive electrode material of lithium battery is an important part of lithium battery and the main factor affecting the performance of lithium battery. Now the commercialized positive electrode material mainly includes LiCoO 2 , LiMn 2 o 4 , Li(NixCoyMnz)O 2 , Li(NixCoyALz)O ...

Claims

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Application Information

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IPC IPC(8): C01G45/12H01M4/505H01M4/1391
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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