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Method for improving cyclical stability of lithium ion battery containing positive material LiNi0.5Mn1.5O4 and lithium ion battery

A lithium-ion battery and cycle stability technology, applied in the field of lithium-ion batteries, can solve problems such as poor energy storage performance, poor cycle stability, and fast capacity decay, and achieve stable performance, promote side reactions, and improve cycle stability.

Active Publication Date: 2015-07-15
CHERY AUTOMOBILE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, lithium nickel manganese oxide (LiNi 0.5 mn 1.5 o 4 ) Lithium-ion batteries have problems such as poor cycle stability, serious gas swelling, fast capacity decay, and poor energy storage performance, which seriously restrict their development.

Method used

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  • Method for improving cyclical stability of lithium ion battery containing positive material LiNi0.5Mn1.5O4 and lithium ion battery
  • Method for improving cyclical stability of lithium ion battery containing positive material LiNi0.5Mn1.5O4 and lithium ion battery
  • Method for improving cyclical stability of lithium ion battery containing positive material LiNi0.5Mn1.5O4 and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] This embodiment provides a LiNi 0.5 mn 1.5 o 4 / C system lithium ion, the positive electrode material of the lithium ion battery includes LiNi 0.5 mn 1.5 o 4 , the negative electrode material of the lithium-ion battery includes C, and the manufacturing process of the lithium-ion battery is as follows:

[0037] 1. LiNi in this embodiment 0.5 mn 1.5 o 4 The formation stage of the lithium-ion battery of the / C system and the manufacturing process before the formation stage are the same as in Comparative Example 1.

[0038] 2. Charge the lithium-ion battery after formation to a state of charge of 50%.

[0039] 3. The lithium-ion battery was left at a temperature of 38° C. for 36 hours.

[0040] 4. The lithium-ion battery was left at room temperature for 8 hours, and the room temperature was 20°C±5°C.

[0041] 5. The gas in the lithium-ion battery is extracted and heat-sealed to obtain LiNi 0.5 mn 1.5 o 4 / C system lithium-ion battery.

[0042]The entire proces...

Embodiment 2

[0045] This embodiment provides a LiNi 0.5 mn 1.5 o 4 / C system lithium ion, the positive electrode material of the lithium ion battery includes LiNi 0.5 mn 1.5 o 4 , the negative electrode material of the lithium-ion battery includes C, and the manufacturing process of the lithium-ion battery is as follows:

[0046] 1. LiNi in this embodiment 0.5 mn 1.5 o 4 The manufacturing process before the formation stage of the lithium-ion battery of the / C system is the same as that of Comparative Example 1.

[0047] 2. Lithium-ion battery formation stage: Lithium-ion battery is charged and discharged twice at 0.1C, and then charged and discharged twice at 0.2C.

[0048] 3. Charge the lithium-ion battery after formation to a state of charge of 85%.

[0049] 4. The lithium-ion battery was left at a temperature of 30° C. for 12 hours.

[0050] 5. The lithium-ion battery was left at room temperature for 48 hours.

[0051] 6. The gas in the lithium-ion battery is extracted and he...

Embodiment 3

[0060] This embodiment provides a LiNi 0.5 mn 1.5 o 4 / C system lithium ion, the positive electrode material of the lithium ion battery includes LiNi 0.5 mn 1.5 o 4 , the negative electrode material of the lithium-ion battery includes C, and the manufacturing process of the lithium-ion battery is as follows:

[0061] 1. LiNi in this embodiment 0.5 mn 1.5 o 4 The formation stage of the lithium-ion battery of the / C system and the manufacturing process before the formation stage are the same as in Comparative Example 1.

[0062] 2. Charge the lithium-ion battery after formation to a state of charge of 15%.

[0063] 3. Under vacuum conditions, the lithium-ion battery was left at 45° C. for 24 hours.

[0064] 4. Under vacuum conditions, the lithium-ion battery was left at room temperature for 12 hours.

[0065] 5. The gas in the lithium-ion battery is extracted and heat-sealed to obtain LiNi 0.5 mn 1.5 o 4 / C system lithium-ion battery.

[0066] The processes in the ...

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Abstract

The invention discloses a method for improving cyclical stability of a lithium ion battery containing a positive material LiNi0.5Mn1.5O4. The method comprises the following steps of: (1) charging the formed lithium ion battery until the state of charge of the battery is of 15% to 85%; (2) shelving the lithium ion battery for 2 hours to 5 days at 30-70 DEG C; and (3) shelving the lithium ion battery for 2 hours to 7 days at room temperature. According to the method, side reaction in the lithium ion battery is accelerated to quickly achieve stability, so that an SEI (Solid Electrolyte Interface) film formed in the lithium ion battery is more dense, the performance of the film is more stable, and the cyclical stability of the lithium ion battery is improved; and the physiosis phenomenon of the lithium ion battery is effectively relieved, and the thickness change rate of the lithium ion battery is low, so that the cyclical stability of the lithium ion battery is improved, and the lithium ion battery is high in capacity retention rate and good in safe performance.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a method for improving the cycle stability of lithium-ion batteries containing lithium-nickel-manganese-oxygen cathode materials and the lithium-ion batteries. Background technique [0002] From the perspective of global development trends, urbanization, safety, energy and environmental protection policies have become important development directions, all of which affect the development of the automotive industry. In order to cope with the energy crisis and slow down global warming, many countries have begun to attach importance to energy conservation and emission reduction and the development of low-carbon economy. Because electric vehicles are driven by electricity, they can reduce carbon dioxide emissions or even achieve zero emissions, so they have attracted the attention of various countries and developed rapidly. An important factor restricting th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/42H01M10/44
CPCY02E60/10
Inventor 刘三兵刘云建朱广燕翟丽娟
Owner CHERY AUTOMOBILE CO LTD
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