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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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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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 cycle performance of the material, the present invention provides a Uniform phase, regular shape, good consistency doped spinel lithium manganate and preparation method thereof, and lithium-ion secondary battery containing this material with high specific capacity and good cycle performance

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

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preparation example Construction

[0037] The present invention simultaneously provides above-mentioned spinel Li 1+x m y mn 2-x-y o 4 methods of preparation, including

[0038] (1) Mixing materials: mix lithium-containing compound, manganese powder and / or manganese-containing compound, and dopant element-containing compound uniformly according to the chemical dosage ratio, add solvent and stir well, transfer to ball milling tank for ball milling, dry and remove solvent, and obtain mixed raw materials;

[0039] (2) Carrying out high-temperature sintering of the mixed raw material obtained in step (1) under an atmosphere containing oxygen;

[0040] (3) Li obtained from step (2) 1+x m y mn 2-x-y o 4 The precursor is annealed and sintered at low temperature in an atmosphere containing oxygen; cooling 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 lithium manganese oxide is widely used, and the performance of ...

Embodiment 1

[0055] (1) Preparation of cathode material

[0056] 340g lithium carbonate (battery grade), 1400g electrolytic manganese dioxide, 70.22g cobalt nitrate (21% cobalt content), 95.32g aluminum nitrate nonahydrate (battery grade), and 825g deionized water were added to a 5L stirring tank, and stirred After 1.5h, transfer to the ball mill tank of 5L, the control ball-to-material ratio is 1: 1, on the planetary ball mill with the speed ball mill of 150 revs / min 2h, the material after the ball mill is on the rake type vacuum drier (self-made, Negative pressure 0.05Mpa) Dry at 150°C for 4 hours and take it out. The dried material is first heated to 650°C at a rate of 5°C / min in the muffle furnace, kept at a constant temperature for 6 hours, then raised to 900°C at a rate of 3°C / min, kept at a constant temperature for 12 hours, and then heated at a rate of 5°C / min Cool down to 700°C, keep the temperature constant for 8 hours, then cool down to 500°C at a rate of 5°C / min, hold the temp...

Embodiment 2

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

[0071] Measure the I of material according to the method identical with embodiment 1 400 / I 311 ; 111,311, half width B value, I of 400 peak crystal plane diffraction peaks 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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