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Anode of lithium-ion battery and lithium-ion battery prepared from same

A lithium-ion battery and negative electrode technology, which is applied to secondary batteries, battery pack components, circuits, etc., can solve the problems of reducing the blocking effect of alumina coating, the drawbacks that have not been substantially solved, and the discount of battery safety improvement. , to achieve the effect of improving safety and high temperature cycle performance, preventing internal short circuit, and high mechanical strength

Inactive Publication Date: 2015-12-23
DALIAN CBAK POWER BATTERY CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the aluminum oxide currently used is nano-sized alumina particles. Since the internal resistance of the battery will increase significantly if the coating is too thick, the coating thickness is usually not more than 5um, but the thinner coating will reduce the blocking effect of the alumina coating. At the same time, the safety improvement of the battery is also greatly reduced
In addition, since the alumina coating still needs to rely on the traditional PP or PE diaphragm, many disadvantages of PP and PE diaphragms have not been substantially resolved

Method used

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  • Anode of lithium-ion battery and lithium-ion battery prepared from same
  • Anode of lithium-ion battery and lithium-ion battery prepared from same
  • Anode of lithium-ion battery and lithium-ion battery prepared from same

Examples

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Embodiment 1

[0029] Embodiment 1 A kind of negative pole of lithium ion battery

[0030] This embodiment provides a lithium ion battery negative pole, such as figure 1 As shown, it is a negative electrode substrate layer, a negative electrode active material layer, and an alumina microporous coating from bottom to top.

[0031] Wherein, the thickness of the prepared alumina microporous coating is 20±1 μm.

[0032] Wherein, the micropore diameter of the prepared alumina microporous coating is between 0.03-0.12 μm.

[0033] Wherein, the porosity of the prepared alumina microporous coating is about 45%.

[0034] Wherein, the alumina material is prepared by mixing the α-crystalline porous alumina ceramic particle material with a binder with a molecular weight of 1 million at a mass ratio of 95:5 to form a slurry, and then the negative electrode active material that has been rolled The surface of the layer is coated with a coating film with a thickness of 20 μm. As for the α-crystalline por...

Embodiment 2

[0037] Embodiment 2 A kind of negative pole of lithium ion battery

[0038] This embodiment provides a lithium-ion battery negative electrode similar in structure to that of Embodiment 1, the only difference being that the thickness of the alumina microporous coating is 11±1 μm.

Embodiment 3

[0039] Embodiment 3 A kind of negative pole of lithium ion battery

[0040] This embodiment provides a lithium-ion battery negative electrode similar in structure to that of Embodiment 1, the only difference being that the thickness of the alumina microporous coating is 29±1 μm.

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Abstract

The invention relates to an anode of a lithium-ion battery and a lithium-ion battery prepared from the same. The anode of the lithium-ion battery comprises an anode base material layer, an anode active substance layer, and an aluminum oxide micro-pore coating which can replace traditional lithium-ion battery PP and PE isolating membranes. The aluminum oxide micro-pore coating on the surface of the anode of the lithium-ion battery not only has relatively high mechanical intensity, but also has good electrolyte-keeping capability, avoids the phenomenon of closing holes at a high temperature, furthermore guarantees a battery to have better high-temperature adaptability in a temperature application scope, and is applicable for a high-power lithium-ion battery.

Description

technical field [0001] The invention relates to a negative electrode for a lithium ion battery and the prepared lithium ion battery, belonging to the technical field of lithium ion batteries. Background technique [0002] Lithium-ion batteries have been widely used in modern society due to their high voltage, high specific energy, long cycle life, and good safety performance. Lithium-ion batteries have gradually replaced traditional batteries in some aspects such as mobile phones, portable computers, video cameras, and cameras. Among them, high-rate lithium-ion batteries have been tried in electric vehicles and will become one of the main power sources of electric vehicles in the 21st century. [0003] The performance of the separator determines the interface structure and internal resistance of the lithium-ion battery, which directly affects the capacity, cycle and safety performance of the lithium-ion battery. A separator with excellent performance plays an important role...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M10/0525
CPCH01M10/0525H01M50/409Y02E60/10
Inventor 戴华斌田秀君张亮郭佳胡景博曹启飞
Owner DALIAN CBAK POWER BATTERY CO LTD
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