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Porous lithium manganate positive electrode material and preparation method thereof

A positive electrode material, porous lithium manganate technology, applied in positive electrodes, chemical instruments and methods, manganate/permanganate, etc., can solve the problem of poor cell rate performance, affecting the expansion of lithium manganate market segments, etc. problem, to achieve high energy density, excellent rate performance, and the effect of being conducive to industrial production

Pending Publication Date: 2020-11-13
山东科源新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the rate performance of traditional lithium manganese oxide is much worse than that of nickel-cobalt lithium manganese oxide. When used alone or mixed with nickel-cobalt lithium manganese oxide, the rate performance of the battery cell is poor, which seriously affects the market segment of lithium manganese oxide. expand

Method used

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  • Porous lithium manganate positive electrode material and preparation method thereof
  • Porous lithium manganate positive electrode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] The preparation formula is LiMn 1.95 m 0.05 o 4 High rate lithium manganese oxide cathode material.

[0017] Lithium carbonate, manganese source (EMD) and additive Al are fully mixed according to their elemental molar ratio of 1.06:1.95:0.05, and then kept in a box furnace at a pressure of 10MPa under an oxygen atmosphere and kept at 800°C for 20 hours. After firing at high temperature, the furnace body keeps the oxygen pressure and cools down naturally, stops maintaining the pressure when it is below 500°C, turns on the furnace and cools down to normal temperature naturally when it is below 300°C, and then sieves to obtain the porous lithium manganate cathode material.

[0018] Depend on figure 1 It can be seen from the scanning electron microscope image in the figure that the internal pores of the obtained porous lithium manganese oxide particles increase significantly.

Embodiment 2

[0020] The preparation formula is LiMn 1.93 m 0.07 o 4 High rate lithium manganese oxide cathode material.

[0021] Lithium carbonate, manganese source (EMD) and additive Mg are fully mixed according to their elemental molar ratio of 1.05:1.93:0.07, and then kept in a box furnace under an oxygen atmosphere at a pressure of 8MPa and kept at 780°C for 18 hours. After firing at high temperature, the furnace body keeps the oxygen pressure and cools down naturally, stops maintaining the pressure when it is below 500°C, turns on the furnace and cools down to normal temperature naturally when it is below 300°C, and then sieves to obtain the porous lithium manganate cathode material.

Embodiment 3

[0023] The preparation formula is LiMn 1.97 m 0.03 o 4 High rate lithium manganese oxide cathode material.

[0024] Lithium carbonate, manganese source (EMD) and additive Nb are fully mixed according to their elemental molar ratio of 1.06:1.97:0.03, and then kept at 850°C for 15 hours in a box furnace under an oxygen atmosphere at a pressure of 10MPa. After firing at high temperature, the furnace body keeps the oxygen pressure and cools down naturally, stops maintaining the pressure when it is below 500°C, turns on the furnace and cools down to normal temperature naturally when it is below 300°C, and then sieves to obtain the porous lithium manganate cathode material.

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Abstract

The invention relates to a porous lithium manganate positive electrode material and a preparation method thereof, and belongs to the technical field of lithium ion batteries. The porous lithium manganate positive electrode material has a cubic spinel structure of lithium manganate, the chemical formula is LiMn2-xMxO4, M is one element or more of Al, Mg or Nb, and x is 0.03-0.09. The preparation method comprises the following steps: uniformly mixing an Mn source, Li2CO3 and M according to a molar ratio of (1.04-1.08): (1.93-1.95): (0.05-0.07), sintering at a high temperature, naturally cooling,and sieving. A battery cell made of the positive electrode material has excellent rate capability, the requirements of various electric tools on the lithium ion battery positive electrode material are completely met, and the invention also provides a simple and feasible preparation method, which is beneficial to industrial production.

Description

technical field [0001] The invention relates to a porous lithium manganate cathode material and a preparation method thereof, belonging to the technical field of lithium ion batteries. Background technique [0002] In the early 1980s, American scholar J.B.Goodenough and others first discovered lithium cobalt oxide (LiCoO 2 ), lithium nickelate (LiNiO 2 ) and lithium manganate (LiMn 2 o 4 ) can be used as a material for deintercalating lithium ions, and related patents have been applied for. [0003] Compared with cobalt and nickel, manganese has important resource advantages, and it is easier to be widely used in electric vehicles, electric tools and other fields, and its preparation process is much simpler than lithium cobalt oxide and lithium nickel oxide, which has great prospects. However, the rate performance of traditional lithium manganese oxide is much worse than that of nickel-cobalt lithium manganese oxide. When used alone or mixed with nickel-cobalt lithium ma...

Claims

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Application Information

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IPC IPC(8): C01G45/12H01M4/485H01M4/505H01M10/0525
CPCC01G45/1242H01M4/505H01M4/485H01M10/0525H01M2004/028C01P2004/03Y02E60/10
Inventor 郝伟于鲲鹏
Owner 山东科源新材料有限公司
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