Spherical lithium ion battery anode material and preparation method of precursor thereof

A technology for lithium-ion batteries and positive electrode materials, which is applied in the direction of battery electrodes, circuits, electrical components, etc., to achieve the effects of good charge and discharge reversibility and good cycle performance

Active Publication Date: 2012-10-31
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method can be used to prepare spherical lithium ion cathode material precursors, it needs to strictly control the preparation conditions to ensure the uniformity of the material particles.

Method used

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  • Spherical lithium ion battery anode material and preparation method of precursor thereof
  • Spherical lithium ion battery anode material and preparation method of precursor thereof
  • Spherical lithium ion battery anode material and preparation method of precursor thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Preparation of nano-nickel hydroxide: 0.015mol of NiCl 2 ·6H 2 0, 0.03mol of NaOH, respectively dissolved in 25mL water to form a solution, mix the two in a reaction kettle, place them in an oven at 180°C for 24 hours, separate and dry to obtain nano-nickel hydroxide .

[0023] Preparation of lithium-ion battery cathode material: 0.25 g of the prepared nano-nickel hydroxide was dispersed in 50 mL of distilled water, and 2.57 g of CoCl 2 ·6H 2 O was dissolved in the above system, and the resulting mixture was placed in a reaction kettle and reacted in an oven at 200 °C for 24 hours. After the reaction was completed, it was naturally cooled to room temperature, centrifuged and dried at 60 °C to obtain spherical lithium-ion battery materials. precursor, whose shape is as figure 1 shown in a. Depend on figure 1 It can be seen that the precursor is in the form of spherical particles, and its particle size distribution is relatively uniform, mainly between 8-10 mi...

Embodiment 2

[0026] 0.25 g of the prepared nano-nickel hydroxide was dispersed in 50 mL of distilled water, and 1.93 g of CoCl 2 ·6H 2 O is dissolved in the above system, and the resulting mixture is placed in a reaction kettle and reacted in an oven at 200 °C for 24 hours. After the reaction is completed, it is naturally cooled to room temperature, centrifuged and dried at 60 °C to obtain a spherical lithium-ion battery material precursors.

[0027] Take 1 g of the lithium-ion battery material precursor prepared in the above steps and grind and mix them with 0.28 g of LiOH. After mixing, program the temperature in a muffle furnace to 500 ° C for 5 hours, then calcinate at 750 ° C for 12 hours, and cool naturally After that, the spherical lithium-ion battery material (LiNi 0.23 co 0.77 o 2 ).

Embodiment 3

[0029] 0.25 g of the prepared nano-nickel hydroxide was dispersed in 50 mL of distilled water, and 1.28 g of CoCl 2 ·6H 2 O was dissolved in the above system, and the resulting mixture was placed in a reaction kettle and reacted in an oven at 200 °C for 24 hours. After the reaction was completed, it was naturally cooled to room temperature, and dried at 60 °C after centrifugation to obtain spherical lithium-ion battery materials. Precursor.

[0030] Take 1 g of the lithium-ion battery material precursor prepared by the above steps and grind and mix them with 0.28 g of LiOH. After mixing, program the muffle furnace to 500 ° C for 5 hours, then calcinate at 750 ° C for 12 hours, and cool naturally After that, the spherical lithium-ion battery material (LiNi 0.44 co 0.56 o 2 ).

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Abstract

The invention relates to a spherical lithium ion battery anode material and a preparation method of a precursor thereof. The preparation method comprises the following steps of: with newly-prepared nano flaky nickel hydroxide as a raw material, dispersing the raw material in an aqueous solution, adding a certain proportion of cobalt salt into the aqueous solution, reacting for several hours in an enclosed vessel to obtain uniform spherical granules which can be used as a precursor for preparing the lithium ion battery anode material; and uniformly mixing the obtained precursor granules and a lithium salt and carrying out high-temperature calcining to finally obtain the spherical lithium ion battery anode material with uniform granule size. The preparation method disclosed by the invention is simple to operate, high in efficiency, easy in obtainment of raw material, low in cost and environment-friendly; and the prepared spherical lithium battery anode material has good electrochemical property.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a preparation method of a positive electrode material of a spherical lithium ion battery and a precursor thereof. Background technique [0002] At present, lithium-ion batteries are a research hotspot in power systems used in various mobile communication devices and green vehicles such as electric vehicles. The performance of lithium-ion batteries depends largely on the performance of its key materials, and improving the performance of materials is a long-term and difficult process. [0003] As the key active material of lithium-ion batteries, the shape of its particles directly affects the performance of the material. The spherical shape is the best shape for the active material of commercial batteries. This kind of spherical particles has better fluidity, which is convenient for slurry preparation during the preparation of pole pieces; in addition, it...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/525
CPCY02E60/122Y02E60/10
Inventor 陈卫华张建民米立伟王爽姚亚婷郑文露孟阵李绍兰梦
Owner ZHENGZHOU UNIV
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