A kind of nickel cobalt lithium manganate hollow sphere and its preparation method and application

A technology of nickel cobalt lithium manganate and hollow spheres, applied in chemical instruments and methods, manganate/permanganate, nickel compounds, etc., can solve the problems of low specific capacity and rate performance of materials, and improve specific capacity. and rate performance, more active sites for lithium storage, and the effect of large specific surface area

Active Publication Date: 2017-02-22
CHERY AUTOMOBILE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] LiNi provided by prior art x co y mn z o 2 The specific capacity and rate performance of the material are low

Method used

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  • A kind of nickel cobalt lithium manganate hollow sphere and its preparation method and application
  • A kind of nickel cobalt lithium manganate hollow sphere and its preparation method and application
  • A kind of nickel cobalt lithium manganate hollow sphere and its preparation method and application

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preparation example Construction

[0043] In the third aspect, the embodiment of the present invention provides a method for preparing nickel-cobalt-lithium-manganese-oxide hollow spheres, with figure 1 For the preparation flow chart of this method, as attached figure 1 As shown, the method includes:

[0044] Step 101, according to the chemical formula LiNi x co y mn z o 2 The stoichiometric ratio, the preparation of the aqueous solution of the mixture of nickel salt, cobalt salt and manganese salt.

[0045] Wherein, nickel salt is selected from at least one of nickel nitrate, nickel sulfate, nickel chloride; Cobalt salt is selected from at least one of cobalt nitrate, cobalt sulfate, cobalt chloride; Manganese salt is selected from manganese nitrate, manganese sulfate, At least one of manganese chloride.

[0046] Step 102, adding a predetermined amount of carbon spheres into the aqueous solution of the mixture of nickel salt, cobalt salt and manganese salt, ultrasonically oscillating for 0.5-1 h and then...

Embodiment 1

[0063] Prepare 100 mL of an aqueous solution of a mixture of nickel nitrate, cobalt nitrate, and manganese nitrate with a concentration of 1 mol / L, and add 0.2 g of carbon spheres to it, then ultrasonically vibrate for 0.5 h, and then continue to stir for 0.5 h. A first suspension is obtained. Add 0.35 mol of urea to the first suspension, stir well to obtain a second suspension, transfer the second suspension to a flask, heat to 80°C after sealing well and keep it warm for 10 hours to obtain a third suspension . After the third suspension was naturally cooled to room temperature, it was centrifuged to obtain a precipitate, which was washed several times with distilled water and ethanol, and then dried at 60°C to obtain Ni 1 / 3 co 1 / 3 mn 1 / 3 (OH) 2 / C.

[0064] According to the molar ratio Ni+Mn+Co:Li=1:1.1, the Ni 1 / 3 co 1 / 3 mn 1 / 3 (OH) 2 Add / C and lithium hydroxide to 20mL ethanol solution, stir until the ethanol solution is completely evaporated to obtain a solid mi...

Embodiment 2

[0067] Prepare 100 mL of an aqueous solution of a mixture of nickel sulfate with a concentration of 2 mol / L, cobalt sulfate with a concentration of 1 mol / L, and nickel-cobalt-manganese salt with a concentration of 2 mol / L manganese sulfate, and add 0.4 g of carbon spheres to it, and then ultrasonically After shaking for 1 h and continuing to stir for 1 h, the first suspension was obtained. Add 0.55 mol of urea to the first suspension, stir well to obtain the second suspension, transfer the second suspension to a flask, heat to 100°C after sealing well and keep it warm for 6 hours to obtain the third suspension . After the third suspension was naturally cooled to room temperature, it was centrifuged to obtain a precipitate, which was washed several times with distilled water and ethanol, and then dried at 60°C to obtain Ni 0.4 co 0.2 mn 0.4 (OH) 2 / C.

[0068] According to the molar ratio Ni+Mn+Co:Li=1:1.1, the Ni 0.4 co 0.2 mn 0.4 (OH) 2 / C and lithium carbonate are a...

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Abstract

The invention discloses a nickel-cobalt lithium manganese oxide hollow sphere, a preparation method and an application thereof, and belongs to the field of lithium-ion battery cathode materials. The specific surface area of ​​the nickel-cobalt lithium manganate hollow sphere is 150-250m2 / g. On the one hand, the nickel-cobalt-manganese-cobalt-manganese oxide with a hollow spherical structure can provide more active sites for lithium storage, so that it has a higher specific capacity; on the other hand, the nickel-cobalt-lithium manganate with a hollow spherical structure has a larger Surface area (150-250m2 / g), and can reduce the diffusion path of lithium ions, so that it has a high rate capability.

Description

technical field [0001] The invention relates to the field of positive electrode materials for lithium ion batteries, in particular to a nickel-cobalt lithium manganese oxide hollow sphere, a preparation method and an application thereof. Background technique [0002] As a high-energy storage battery, lithium-ion batteries have the advantages of high energy density, long service life, good cycle performance and no memory effect, and are widely used in electronic devices such as mobile phones and digital cameras. Lithium-ion battery cathode material is an important part of lithium-ion batteries, and it has an important impact on the electrochemical performance of lithium-ion batteries. Among the current commercial lithium-ion battery cathode materials, lithium cobalt oxide has a large market share. However, due to the scarcity of cobalt resources, high price, poor safety performance, and high toxicity, the development of lithium-ion batteries has been seriously affected and re...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/505H01M4/525C01G45/12
CPCC01G45/12C01G51/00C01G53/00H01M4/505H01M4/525H01M10/0525H01M2004/021Y02E60/10
Inventor 梅周盛刘三兵朱广燕海滨卢磊
Owner CHERY AUTOMOBILE CO LTD
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