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Lithium-manganese composite oxide in which size of vertical angle of primary particle is adjusted, and method for preparing same

A composite oxide, apex angle technology, applied in manganese compounds, lithium compounds, chemical instruments and methods, etc., can solve the problems of different surface resistance according to position, temperature rise, battery resistance increase, etc., to achieve the effect of improving battery characteristics

Inactive Publication Date: 2015-01-14
浦项能源材料公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, in the process of forming the above-mentioned electrode plate by rolling, the surface of the electrode plate is uneven due to the sharp edges of the primary particles constituting the above-mentioned active material. Therefore, if the surface of the electrode plate is not smooth, the surface resistance varies depending on the position. Current concentration occurs on the side with less resistance
[0007] As a result, lithium metal precipitates and forms dendrites due to current concentration, or problems such as a sharp rise in temperature occur.
In addition, if the surface is not uniform, the initial surface film on the electrode active material will also be formed unevenly and the ion conductivity will be different. Eventually, the battery resistance will increase and the ion conductivity will decrease, so there will be a terminal life when repeated charging and discharging. problems like shortening

Method used

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  • Lithium-manganese composite oxide in which size of vertical angle of primary particle is adjusted, and method for preparing same
  • Lithium-manganese composite oxide in which size of vertical angle of primary particle is adjusted, and method for preparing same
  • Lithium-manganese composite oxide in which size of vertical angle of primary particle is adjusted, and method for preparing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Measurement of SEM image

[0047] Measure the SEM images of the lithium-manganese composite oxides prepared in the above-mentioned examples and comparative examples respectively, and the results are shown in image 3 middle.

[0048] Such as image 3 As shown, it can be seen that the apex angles of the lithium-manganese composite oxides produced in the examples of the present invention are rounded.

Embodiment 2

[0049] Measurement of Vertex Angle

[0050] With respect to the lithium-manganese composite oxide secondary particles prepared in the above-mentioned examples and comparative examples, 10 primary particles were randomly selected, and the diagonal angles of the polygons constituting the primary particles were respectively measured, and the results are shown in Table 1 below middle.

[0051] Table 1

[0052] [Table1]

[0053]

Example

comparative example

1

101°

60°

2

103°

72°

3

108°

65°

4

98°

67°

[0054] 5

96°

59°

6

100°

73°

7

102°

82°

8

95°

69°

9

110°

72°

10

112°

73°

[0055] It can be seen from the above Table 1 that, for the lithium-manganese composite oxide secondary particles prepared according to the examples of the present invention, the magnitude of the opposite apex angle of the pol...

Embodiment 3

[0060] Measurement of life characteristics

[0061] The above-mentioned charging and discharging were carried out at room temperature and high temperature (45°C) for 80 cycles, and the discharge capacity was measured to measure the life characteristics. The results are shown in Figure 5 , Figure 6 middle.

[0062] From Figure 5 , Figure 6 It can be seen from the figure that the capacity of the lithium manganese composite oxide prepared according to the present invention is improved and kept constant at room temperature and high temperature (45°C) compared with the comparative example, so that the life characteristics are improved.

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Abstract

The present invention relates to a lithium-manganese composite oxide in which the size of the face angle of a primary particle is adjusted, and to a method for preparing the same. The lithium-manganese composite oxide in which the size of the vertical angle of the primary particle is adjusted and method for preparing same according to the present invention may gently adjust the size of the vertical angle of the polyhedron that constitutes primary particles having a shape of a convex polyhedron in the lithium-manganese composite oxide, thus preventing the formation of convex-concave portions at the surface of a pole plate in the process of forming the pole plate by means of rolling during the manufacturing of a battery, resulting in improved characteristics of the battery.

Description

technical field [0001] The present invention relates to a lithium-manganese composite oxide with adjusted apex angles of primary particles and a preparation method thereof, in particular to a lithium-manganese composite oxide with adjusted apex angles of polygons constituting convex polyhedral primary particles. substances and their preparation methods. Background technique [0002] In recent years, with the accelerated development of electrical, electronic, communication and computer industries, the demand for high-performance and high-safety lithium secondary batteries is gradually increasing, especially with the miniaturization, thinning and lightening of electronic equipment To accelerate diffusion, the demand for miniaturization and thinning of batteries is increasing day by day. [0003] Moreover, the lithium-manganese composite oxide with a spinel structure has the advantages of safety and price compared with lithium at 4volt potential or other anode active materials...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/139C01G45/02H01M10/052
CPCH01M4/505Y02E60/122C01G45/12H01M10/052H01M2004/021C01G45/1242C01G51/52C01G53/52C01P2004/03C01P2004/10C01P2004/20C01P2004/39C01P2004/62Y02E60/10C01D15/00C01G45/00C01P2004/50C01P2006/40
Inventor 闵盛焕李民英高炯信李宰安
Owner 浦项能源材料公司
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