Lithium manganate cathode material and preparation method thereof

A cathode material, lithium manganate technology, applied in the direction of positive electrode, chemical instruments and methods, manganate/permanganate, etc., can solve the contradiction between energy density and high temperature performance of lithium manganate material, reduce the specific capacity of cathode material , reduce the energy density of materials and other issues, to achieve the effect of improving high-temperature storage and high-temperature cycle performance, eliminating technical contradictions, and facilitating industrial production

Inactive Publication Date: 2020-07-14
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, lithium manganese oxide has an important disadvantage: it reacts with the electrolyte to make high-temperature storage and high-temperature cycle performance poor, which limits the rapid promotion of lithium manganate in the field of electric vehicles and electric bicycles.
[0004] LiMn can be improved by doping Cr, Mg, Al, Ni, Co and other elements to replace part of trivalent Mn. 2 o 4 The structural stability of the material improves the cycle performance of the material, but a disadvantage of doping is that it reduces the specific capacity of the positive electrode material and reduces the energy density of the material
At this time, it is found that the technical contradiction of lithium manganate in the field of electric vehicles is: the contradiction between the energy density and high temperature performance of lithium manganate materials

Method used

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  • Lithium manganate cathode material and preparation method thereof
  • Lithium manganate cathode material and preparation method thereof
  • Lithium manganate cathode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The preparation formula is LiMn 1.97 m 0.03 o 4 Surface vitrified lithium manganate cathode material.

[0023] Lithium carbonate, manganese source (EMD) and additive B are fully mixed according to their elemental molar ratio of 1:1.97:0.03, then kept at 650°C for 4h and then at 850°C for 12 hours. After the heat preservation is completed, the temperature is directly lowered in the water circulation cooling zone. After cooling to room temperature, sieve to get the finished product.

[0024] Depend on figure 1 It can be seen from the scanning electron microscope image in the figure that the surface of the obtained lithium manganate particles has obvious vitrification phenomenon. The sharp corners of the particles are basically eliminated.

[0025] Depend on figure 2 It can be seen from the XRD pattern in the figure that the obtained lithium manganese oxide is a standard spinel phase, and no impurity phase exists.

[0026] Depend on image 3 The high-temperature ...

Embodiment 2

[0028] The preparation formula is LiMn 1.99 m 0.01 o 4 Surface vitrified lithium manganate cathode material.

[0029] Lithium carbonate, manganese source (Mn 3 o 4 ) and additive S according to their elemental molar ratio of 1:1.95:0.01 are fully mixed, then kept at 450°C for 8h and then at 780°C for 14 hours. After the heat preservation is completed, the temperature is directly lowered in the water circulation cooling zone. After cooling to room temperature, sieve to get the finished product.

Embodiment 3

[0031] The preparation formula is LiMn 1.95 m 0.05 o 4 Surface vitrified lithium manganate cathode material.

[0032] Lithium carbonate, manganese source (Mn 3 o 4 ), additive S and additive Mg according to their elemental molar ratio of 1:1.95:0.02:0.03, after being fully mixed, they were kept at 580°C for 6 hours and then at 820°C for 8 hours. After the heat preservation is completed, the temperature is directly lowered in the water circulation cooling zone. After cooling to room temperature, sieve to get the finished product.

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Abstract

The invention relates to a lithium manganate cathode material and a preparation method thereof, and belongs to the technical field of lithium ion batteries. The lithium manganate cathode material hasa cubic spinel structure of lithium manganate, the chemical formula of the lithium manganate cathode material is LiMn2-xMxO4, M is one element or a combination of more elements of Mg, S, B or Nb, andx is 0.01-0.05. The lithium manganate cathode material disclosed by the invention has excellent high-temperature storage and high-temperature cycle performance and very high energy density, and completely meets the requirements of the fields of electric vehicles and electric bicycles on the lithium ion battery positive electrode material; 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 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 the fields of electric vehicles and electric bicycles, and its preparation process is much simpler than lithium cobalt oxide and lithium nickel oxide, which has great prospects. However, lithium manganate has an important disadvantage: the reaction with the electrolyte makes the high-temperature storage and high-temperature cycle performance poor, which limits the rapi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G45/12H01M4/505H01M10/0525
CPCC01G45/1214C01P2002/72C01P2004/03C01P2006/40H01M4/505H01M10/0525H01M2004/021H01M2004/028Y02E60/10
Inventor 郝伟于鲲鹏
Owner 山东科源新材料有限公司
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