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Single crystal lithium manganese oxide for lithium ion battery and preparation method thereof

A lithium-manganese oxide and lithium-ion battery technology, applied in chemical instruments and methods, single crystal growth, battery electrodes, etc., can solve the problem of irreversible Mn, without mentioning the inhibition of Mn dissolution, reducing the charge and discharge capacity and electrical properties of materials Stability and other issues, to achieve the effect of inhibiting dissolution, excellent normal temperature cycle performance and high temperature cycle performance, and eliminating oxygen defects

Active Publication Date: 2010-09-22
HUNAN SHANSHAN ENERGY TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In addition, an important indicator for judging the quality of spinel-type single crystal lithium manganese oxide materials is the dissolution of Mn. During the charging and discharging process of the battery, the electrolyte will have some side reactions correspondingly, producing a small amount of hydrofluoric acid ( HF), HF can be combined with LiMn 2 o 4 The material reacts to produce inactive single crystal lithium manganese oxide, which leads to the generation and dissolution of irreversible Mn, which reduces the charge and discharge capacity and electrical performance stability of the material. Solving the problem of manganese dissolution is also a must for the development of single crystal lithium manganese oxide materials. subject, and the above two patents do not mention the inhibition of Mn dissolution and solve it

Method used

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  • Single crystal lithium manganese oxide for lithium ion battery and preparation method thereof
  • Single crystal lithium manganese oxide for lithium ion battery and preparation method thereof
  • Single crystal lithium manganese oxide for lithium ion battery and preparation method thereof

Examples

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Effect test

Embodiment 1

[0026] (1) Press Li(Mn 1.8 Li 0.1 co 0.05 Mg 0.05 )O 4 10 kg of electrolytic manganese dioxide (EMD) and corresponding weight of lithium carbonate (Li 2 CO 3 ), doped metal oxide Co 2 o 3 and MgO are added to the mixing tank and mixed for 1-5 hours, and mixed evenly;

[0027] (2) The first stage of sintering: sintering at a sintering temperature of 1150°C for 5 hours at a constant temperature; the dopant enters the crystal lattice through a high temperature method to form single crystal particles and reduce the specific surface area of ​​the single crystal lithium manganese oxide material;

[0028](3) The single crystal particles sintered in the first stage are crushed by ball milling for powder treatment, and sieved through 200 mesh to obtain single crystal particles with a D50 of 3-15 microns;

[0029] (4) Second-stage sintering: sintering at a constant temperature of 600°C for 15 hours; used for low-temperature annealing of materials, eliminating oxygen defects that...

Embodiment 2

[0041] Press Li(Mn 1.82 Li 0.15 Al 0.015 Cr 0.015 )O 4 Design the raw material electrolytic manganese dioxide (EMD) 10kg and the corresponding weight of lithium carbonate (Li 2 CO 3 ), doped metal oxide Al 2 o 3 and Cr 2 o 3 , one-stage sintering at 950° C., constant temperature sintering for 8 hours;

[0042] The XRD and SEM images of the synthesized product are shown as Figure 6 , 7 As shown, it has a complete crystal form and ideal single crystal particles.

Embodiment 3

[0044] Press Li(Mn 1.84 Li 0.06 Fe 0.05 Ti 0.05 )O 4 Design the raw material electrolytic manganese dioxide (EMD) 10kg and the corresponding weight of lithium carbonate (Li 2 CO 3 ), doped metal oxide Fe 2 o 3 and TiO 2 , One-stage sintering at 800°C, constant temperature sintering for 10 hours; second-stage sintering at 800°C, constant temperature sintering for 10 hours, other synthesis conditions are the same as in Example 1.

[0045] The XRD and SEM images of the synthesized product are shown in Figures 8 and 9, respectively. The product has a complete crystal form and single crystal particles.

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Abstract

The invention discloses a single crystal lithium manganese oxide for a lithium ion battery and a preparation method thereof. The single crystal lithium manganese oxide is a pure spinel prepared by doping at least three elements of Li, M1 and M2 with a chemical formula of Li(Mn2-x-y-zLixM1yM2z)O4, the specific surface area thereof is 0.2-0.6m<2> / g, and the tap density thereof is 1.5-2.5g / cm<3>; and in the chemical formula, M1 and M2 are respectively one element of Fe, Co, Al, Ca, Mg, Ti, Cr, Ni and Y, wherein 0.05<=x<=0.15, 0.01<=y<=0.1, and 0.01<=z<=0.1. The invention can eliminate oxygen defects caused in the high temperature sintering process, has low specific surface area of single crystal particles, inhibits Mn from dissolving better, has excellent multiplying power property and normal temperature and high temperature circulation performance, and can satisfy use requirements of power vehicles even electric vehicles; 10C / 1C ratio thereof is over 95%, and the service life thereof is at least 5 years; and the invention can be applied to lithium ion batteries used in the fields of cellphones, electric tools, electric motor cars, electric vehicles and the like.

Description

technical field [0001] The invention relates to a positive electrode material for a lithium ion battery; in particular, it relates to a single crystal lithium manganese oxide for a lithium ion battery and a preparation method thereof. Background technique [0002] At present, the positive electrode materials used in lithium-ion batteries for electric vehicles are mainly single crystal lithium manganese oxide and lithium iron phosphate. Among them, lithium iron phosphate has good cycle performance, but poor conductivity, poor stability of synthesis process, and difficult to achieve industrial stable production; although single crystal lithium manganese oxide can be used as positive electrode material, but spinel single crystal lithium manganese oxide (LiMn 2 o 4 ) materials have the John-Teller effect, which is prone to structural distortion during charging and discharging, resulting in rapid attenuation, especially under the conditions of higher temperature, the capacity a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/131H01M4/1391C30B29/22C30B1/10C30B1/02
CPCY02E60/122Y02E60/10
Inventor 唐朝辉王志兴彭文杰袁荣忠蒋湘康
Owner HUNAN SHANSHAN ENERGY TECH CO LTD
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