Spinel Li1+xMyMn2-x-yO4, preparation method thereof and lithium-ion secondary battery

A xmymn2-x-yo4, spinel technology, applied in the field of doping spinel lithium manganate, can solve the problems of irregular lithium manganate morphology, reduced material cycle performance, low material specific capacity, etc. Excellent cycle performance, high temperature cycle performance and high specific capacity

Inactive Publication Date: 2010-07-21
BYD CO LTD
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  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

[0012] In order to overcome the shortcomings of lithium manganate prepared in the prior art, such as irregular appearance, inhomogeneous phase, and impurity phases, resulting in low specific capacity of the material, easy formation of an oxygen-deficient structure, and reduction of the cy

Method used

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  • Spinel Li1+xMyMn2-x-yO4, preparation method thereof and lithium-ion secondary battery
  • Spinel Li1+xMyMn2-x-yO4, preparation method thereof and lithium-ion secondary battery
  • Spinel Li1+xMyMn2-x-yO4, preparation method thereof and lithium-ion secondary battery

Examples

Experimental program
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Example Embodiment

[0037] The present invention also provides the above spinel Li 1+x M y Mn 2-x-y O 4 The preparation method includes

[0038] (1) Mixing: Mix lithium-containing compound, manganese powder and / or manganese-containing compound, and compound containing doping elements according to the chemical dose ratio, add solvent and stir evenly, transfer to ball mill in a ball mill tank, and dry to remove solvent. Mixed raw materials;

[0039] (2) High-temperature sintering of the mixed raw materials obtained in step (1) in an atmosphere containing oxygen;

[0040] (3) The Li obtained in step (2) 1+x M y Mn 2-x-y O 4 The precursor is annealed and sintered in an oxygen-containing atmosphere; it is cooled to obtain Li 1+x M y Mn 2-x-y O 4 . The preparation method of the invention is simple, low in cost and easy to realize. The prepared spinel structure lithium manganate has a wide range of applications, and the performance of the product using the lithium manganate of the invention is greatly improv...

Example Embodiment

[0054] Example 1

[0055] (1) Preparation of cathode material

[0056] Add 340g lithium carbonate (battery grade), 1400g electrolytic manganese dioxide, 70.22g cobalt nitrate (cobalt content 21%), 95.32g nonahydrate aluminum nitrate (battery grade), and 825g deionized water into a 5L mixing tank and stir After 1.5h, transfer to a 5L ball milling tank, control the ball-to-material ratio to 1:1, ball mill on a planetary ball mill at a speed of 150 revolutions / min for 2 hours, and then ball mill the material on a rake vacuum dryer (self-made, Negative pressure 0.05Mpa) Take it out after drying at 150°C for 4h. The dried material is heated in the muffle furnace at a rate of 5°C / min to 650°C, constant temperature for 6 hours, then at a rate of 3°C / min to 900°C, constant temperature for 12 hours, and then at a rate of 5°C / min The temperature was lowered to 700°C, kept at a constant temperature for 8 hours, then at a rate of 5°C / min to 500°C, kept at a constant temperature for 6 hours, ...

Example Embodiment

[0069] Example 2

[0070] The synthesis method and battery manufacturing method are the same as in Example 1, except that the raw material in the preparation of the positive electrode material contains 10.0 g of anhydrous sodium carbonate (analytical pure) and 5.2 g of magnesium nitrate hexahydrate (analytical pure).

[0071] Measure the I of the material according to the same method as in Example 1. 400 / I 311 ; 111,311,400 peak crystal plane diffraction peak half-width B value, I 311 / I 111 , I 400 / I 111 The data is shown in Table 1; the primary particle diameter is shown in Table 1.

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Abstract

The invention provides a lithium manganese oxide material, i.e. a spinel Li1+xMyMn2-x-yO4, wherein x is less than 0.1 and more than 0, y is less than 0.1 and more than 0, and M is selected from one or a plurality of Mg, Na, Co and Al; the ratio of the 400 crystal face diffraction peak strength I400 to 311 crystal face diffraction peak strength I311 of the Li1+xMyMn2-x-yO4 is 1.05-1.25; the atomic arrangement in crystal of the material is more ordered; the crystallinity degree of the material is higher, and fewer oxygen defects in a crystal lattice exist, thereby being more favourable for the lithium ion intercalation and deintercalation process in the crystal lattice and effectively inhibiting the Jahn-Teller effect to obviously improve the cycle performance of the material; and meanwhile, the invention also provides a preparation method of the material and is simple and easy to realize process. The invention also provides a lithium-ion secondary battery using the material, and the lithium-ion secondary battery has higher specific capacity and cycle performance, especially the high-temperature cycle performance, and satisfies the requirements of the existing battery development.

Description

technical field [0001] The present invention relates to a kind of doping spinel lithium manganese oxide, relate in particular to a kind of spinel Li 1+x m y mn 2-x-y o 4 Its preparation method and lithium ion secondary battery Background technique [0002] Energy, environment, and information technology are the three major themes in the development of science and technology in the 21st century. With the depletion of traditional energy and the continuous deterioration of the earth's environment due to massive consumption, it is an urgent task to find clean and renewable secondary energy to realize the sustainable development of human society. Among many secondary battery systems, lithium-ion batteries have the advantages of high working voltage, high energy density, long cycle life, low self-discharge rate, and environmental protection, and have become the main trend of secondary battery development. It has been widely used in the power supply of portable electrical appl...

Claims

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Application Information

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IPC IPC(8): C01G45/12H01M10/12
CPCY02E60/126Y02E60/10Y02P70/50
Inventor 何方勇先雪峰刘会权
Owner BYD CO LTD
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