LiMn2-xMxO4.yLiAlO2 as anode material for lithium ion battery

A technology for lithium-ion batteries and positive electrode materials, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of self-discharge reversible capacity decay, too fast, poor cycle and storage performance, etc., and achieve excellent overcharge resistance and safety Excellent performance and long cycle life

Inactive Publication Date: 2011-09-28
QINGDAO LNCM
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the cycle and storage performance of this material at high temperature (above 55°C) is poor, so LiMn 2 o 4 Lithium-ion batteries, which are positive active materials, have serious self-discharge phenomena and rapid reversible capacity decay.
[0005] LiMn can be improved by replacing part of Mn with elements Li, Mg, Al, Cr, Ni, Co, etc. 2 o 4 The structural stability of the material improves the cycle performance of the material, but a disadvantage of doping is that the specific capacity of the positive electrode material is reduced
[0006] Obviously, the existing positive electrode active materials cannot meet the requirements of producing large-capacity or high-power lithium-ion batteries

Method used

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  • LiMn2-xMxO4.yLiAlO2 as anode material for lithium ion battery
  • LiMn2-xMxO4.yLiAlO2 as anode material for lithium ion battery
  • LiMn2-xMxO4.yLiAlO2 as anode material for lithium ion battery

Examples

Experimental program
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Effect test

Embodiment 1

[0019] Embodiment 1, preparation LiMn 2-x m x o 4 ·yLiAlO 2 (x=0, y=0.15) solid solution material

[0020] A certain weight of manganese and aluminum composite oxide precursor MnO 2 -Al 2 o 3 with Li 2 CO 3 Fully ground and mixed according to the molar ratio of Li:Mn=0.5:1 and Li:Al=1:1, pre-sintered at 450°C for 5 hours, then heated to 950°C for 24 hours at high temperature, and finally cooled slowly to room temperature.

[0021] The particle size and morphology of the materials were observed on a Hitachi S-4000 scanning electron microscope. from figure 1 We can find that the new modified lithium manganese oxide we prepared is a single crystal primary particle, the grain size is about 5-8 microns, the particle size is uniform, and the surface is smooth.

[0022] The crystal structure of the material was analyzed using a Rigaku B / Max-2400 X-ray diffractometer (Rigaku Ltd.), with Cu Kα line as the light source, and the diffraction angle 2θ ranged from 10° to 90°. fro...

Embodiment 2～10

[0026] According to the preparation method of the present invention, under different conditions, a series of lithium manganese aluminate solid solution LiMn with positive spinel structure are synthesized 2-x m x o 4 ·yLiAlO 2 Cathode material.

[0027] According to the preparation method provided in Example 1 of the present invention, under the different conditions listed in Table 1, a series of normal spinel structure LiMn 2-x m x o 4 ·yLiAlO 2 Cathode material.

[0028] Table 1

[0029] implement

Embodiment 11

[0031] A certain weight of manganese and aluminum composite oxide precursor Mn 3 o 4 -Al 2 o 3 (Mn:Al=1.8:0.2) and Li 2 CO 3Fully ground and mixed according to the molar ratio of Li:Mn=0.5:1 and Li:Al=1:1, pre-sintered at 400 degrees for 8 hours, then raised the temperature to 850 degrees and sintered at high temperature for 24 hours, and finally cooled slowly to room temperature to synthesize The required lithium-ion battery positive spinel manganese-containing positive electrode active material is obtained.

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Abstract

The invention relates to a solid solution for a lithium ion battery with a positive spinel structure having the formula LiMn2-xMxO4.yLiAlO2 (0<=0.1, 0<y<0.5), wherein, M is one or more selected from Mg, Ca, Co, Ni, Cr and Zn. The solid solution can be used as an anode material for the lithium ion battery, characterized in that: the lithium-containing solid solution has good processability of electrodes, super long cycle lifetime, excellent multiplying performance, extraordinary high and low temperature cycle and storage performance and great safety performance, and can be widely used as anode materials for lithium ion batteries, especially for dynamic lithium ion batteries.

Description

technical field [0001] The invention relates to a secondary battery cathode material, in particular to a manganese-containing cathode material for a lithium ion battery. technical background [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. Among them, lithium cobaltate was successfully used in the first commercialized lithium-ion battery for small electronic products as a positive electrode material by Sony Corporation of Japan in the early 1990s due to its excellent electrochemical performance and good electrode processing performance. Although lithium nickelate has a high reversible specific capacity (210mAh / g), it cannot be applied in practical lithium-ion batteries due to its poor structural and thermal stability and difficult syn...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1391H01M4/48
CPCY02E60/12Y02E60/122Y02E60/10
Inventor 孙玉城
Owner QINGDAO LNCM
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