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Modified lithium manganese oxide electrode material for lithium ion secondary battery and synthesizing method thereof

A secondary battery and electrode material technology, applied to battery electrodes, circuits, electrical components, etc., to achieve the effect of improving crystallization characteristics and performance

Inactive Publication Date: 2011-10-05
王明月
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On this basis, how to improve its electrochemical performance through a series of modifications is rarely reported in the literature.

Method used

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  • Modified lithium manganese oxide electrode material for lithium ion secondary battery and synthesizing method thereof
  • Modified lithium manganese oxide electrode material for lithium ion secondary battery and synthesizing method thereof
  • Modified lithium manganese oxide electrode material for lithium ion secondary battery and synthesizing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] 230.1gLi 2 CO 3 , 691.6gMnO 2 , 78.3gCo(CH 3 COO) 2 4H 2 O solid powder is added in the beaker, adding concentration is 15wt.% H 2 o 2 The aqueous solution was stirred continuously at 50°C, reacted for about 12 hours, and then filtered. After the filter cake was washed and dried, it was added into a ball mill tank together with 500ml of absolute ethanol, the mass ratio of Φ10 stainless steel balls to the above raw materials was 0.55, and the speed of the planetary ball mill was 150r / min, and ball milled for 1h. The ball-milled mixture was raised to 650°C at 5°C / min in an atmosphere with an oxygen content of 30%, and then calcined with heat for 12h to obtain 750g of the final product doped lithium manganate solid powder. Rigaku-D / MAX-2550PC X-ray diffractometer (Cu target K-ray wavelength: 0.154nm) was used to test the sample crystal X-ray diffraction pattern at a rate of 0.02° / s.

[0034] The above products lithium manganate, acetylene black, and polyvinylidene ...

Embodiment 2

[0036] Weighing 220.8gLi 2 CO 3 , 663.7gMnO 2 , 75.2gCo(CH 3 COO) 2 4H 2 O, 38.6gTiO 2 Solid powder, mixed with 500ml concentration of 15wt.% H 2 o 2 Add the aqueous solution into the ball mill tank together, the mass ratio of Φ10 stainless steel balls to the above-mentioned raw materials is 0.55, the speed of the planetary ball mill is 150r / min, and perform ball milling for 1h. The above ball-milled mixture was raised to 650°C at 5°C / min in an atmosphere with an oxygen content of 30%, and then kept and calcined for 12h to obtain 760g of a final product containing TiO 2 5wt.% doped lithium manganate solid powder. Carry out X-ray diffraction test and make 2032 button battery and carry out charge and discharge test according to the method described in Example 1.

[0037] The main phase diffraction peaks of the XRD spectrum of the product sample are consistent with those in the literature (Takada, T., Hayakawa, H., Akiba, E.J.Solid State Chem., 1995, 115:420), and TiO 2...

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Abstract

The invention provides a modified lithium manganese oxide electrode material for a lithium ion secondary battery, which is characterized in that the general formula is Li(4-x)A(x+y)Mn(5-y)O12.epsilonBOz. The synthesizing method comprises the following steps: weighing and mixing raw materials evenly in accordance with the stoichiometric ratio in the general formula and then adding the mixture of the raw materials to a container; adding an oxidizing solution, evening mixing and reacting for over 10 minutes, and then taking the materials out, washing and drying; and then carrying out high-temperature calcination and reaction for 1-30 hours at a temperature of 400-1200 DEG C under an oxygen-contained atmosphere, and cooling to obtain the modified lithium manganese oxide electrode material. Compared with an existing electrode material and a synthesizing technology, the modified lithium manganese oxide electrode material produced in the production process can improve the crystalline characteristic and the purity of products as well as the specific capacity, the initial coulomb efficiency, the cyclical stability and other characteristics in electrochemical property; and the modified lithium manganese oxide electrode material improves performances of the lithium ion battery, promotes the wider applications of the lithium ion battery and has significant economic meanings and practical value.

Description

(1) Technical field: [0001] The invention belongs to the technical field of new energy materials, and provides a modified lithium manganate electrode material with high stability and excellent electrochemical performance for lithium ion secondary batteries, and provides a novel synthesis method. (two) background technology: [0002] Lithium-ion secondary batteries have been invented by Japan's SONY company in the 1990s. Because of their advantages such as high working voltage, high energy density, long cycle life, no memory effect, and environmental protection, they have been widely used in portable electronic devices such as cordless phones. , notebook computers, music players, digital cameras and other fields have achieved rapid development, becoming the main direction of secondary battery development. The energy crisis and environmental pollution make it an urgent task to find clean and renewable secondary energy to realize the sustainable development of human society; at...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/1391
CPCY02E60/122Y02E60/12Y02E60/10
Inventor 王明月
Owner 王明月
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