Lithium battery positive electrode, preparation method thereof, lithium battery, power supply system and electric equipment

A technology of power supply system and lithium battery, which is applied in the direction of lithium battery, battery electrode, non-aqueous electrolyte battery electrode, etc., can solve the problem of timely monitoring and suppression of battery thermal runaway, increase the contact resistance between current collector and active material, Problems such as battery rate performance are greatly affected, to achieve the effect of preventing temperature rise, suppressing collapse, and stabilizing product performance

Active Publication Date: 2019-11-08
湖南桑瑞新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, a PTC element (semiconductor material or component with a large positive temperature coefficient) is attached to the outside of the battery pack. When the temperature of the battery pack rises to the Curie temperature of the PTC element, the internal resistance of the PTC element increases rapidly, thereby cutting off the current to prevent the battery from As the temperature of the pack rises further, although the PTC element attached to the outside of the battery pack can monitor the thermal runaway caused by external short circuit, overcharge and other abuses, but because it is far away from the electrode electrolyte interface, it cannot monitor the internal thermal runaway of the battery in time and inhibition
[0004] In the prior art, PTC is also coated on the electrode collector, so that although the temperature change inside the battery due to overcurrent or internal short circuit can be sensed at any time, the passing current can be reduced or blocked, but the PTC coating increases the current collector. The contact resistance with the active material has a great influence on the rate performance of the battery

Method used

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  • Lithium battery positive electrode, preparation method thereof, lithium battery, power supply system and electric equipment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] With polytetrafluoroethylene as binder, acetylene black as conductive agent, LiNi 0.6 co 0.2 mn 0.2 o 2 It is the active substance, the mass ratio of the active substance, acetylene black, and PVDF is 92:4:4, mix well and grind evenly in an agate mortar, and drop into NMP solvent. After grinding for 60 minutes, the slurry was scraped on the aluminum foil of the current collector, and vacuum-dried at 100° C. for 8 hours to obtain a positive electrode substrate.

[0056] Then it is placed in the vacuum reaction chamber of the magnetron sputtering equipment, and the background vacuum pressure of the vacuum chamber is 6.0×10 - 4 Pa, under the sputtering power of 60W, perform radio frequency magnetron sputtering coating, and BaPbO with a purity of not less than 99.95wt% 3 The target is placed in the pressure groove of the hydraulic press and pressed into a thin target as the sputtering source. The surface of the positive electrode is sputtered and coated by the magnetro...

Embodiment 2

[0058] With polytetrafluoroethylene as binder, acetylene black as conductive agent, LiNi 0.8 co 0.15 Al 0.05 o 2 It is the active substance, and the mass ratio of the active substance, acetylene black, and PVDF is 90:4:6, mix well and grind evenly in an agate mortar, and drop into NMP solvent. After grinding for 80 minutes, the slurry was scraped on the current collector aluminum foil, and vacuum-dried at 100° C. for 6 hours to obtain a positive electrode substrate.

[0059] Then it is placed in the vacuum reaction chamber of the magnetron sputtering equipment, and the background vacuum pressure of the vacuum chamber is 2.0×10 - 4 Pa, under the sputtering power of 40W, perform radio frequency magnetron sputtering coating, and BaPbO with a purity of not less than 99.95wt% 3 The target is placed in the pressure groove of the hydraulic press and pressed into a thin target as the sputtering source. The surface of the positive electrode is sputtered and coated by the magnetron...

Embodiment 3

[0061] With polytetrafluoroethylene as binder, acetylene black as conductive agent, LiFePO 4 It is the active substance, the mass ratio of the active substance, acetylene black, and PVDF is 88:6:6, mix well and grind evenly in an agate mortar, and drop into NMP solvent. After grinding for 80 minutes, the slurry was scraped on the aluminum foil of the current collector, and vacuum-dried at 100° C. for 10 hours to obtain a positive electrode substrate.

[0062] Then it is placed in the vacuum reaction chamber of the magnetron sputtering equipment, and the background vacuum pressure of the vacuum chamber is 5.0×10 - 4 Pa, under the sputtering power of 80W, the radio frequency magnetron sputtering coating was carried out, and the BaPbO with a purity of 99.99wt% 3 The target is placed in the pressure groove of the hydraulic press and pressed into a thin target as the sputtering source. The surface of the positive electrode is sputtered and coated by the magnetron sputtering metho...

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Abstract

The invention provides a lithium battery positive electrode, a preparation method thereof, a lithium battery, a power supply system and electric equipment. The lithium battery positive electrode comprises a positive electrode substrate and a functional layer arranged on the surface of the positive electrode substrate, wherein the positive electrode substrate comprises a current collector and an active conductive layer arranged on the surface of the current collector, and the active conductive layer comprises an active substance, a conductive agent and a binder; the active substance comprises LiM [sigma] O [lambda]; the functional layer comprises BaPbO3. The preparation method of the lithium battery positive electrode comprises the following steps: mixing the active substance, the conductive agent and the binder to prepare slurry; coating the slurry on the surface of the current collector, and drying to obtain the positive electrode substrate; using the baPbO3 as a target material, andobtaining the functional layer by processing on the surface of the positive electrode substrate through magnetron sputtering. The lithium battery comprises the lithium battery positive electrode. Thepower supply system comprises the lithium battery. The electric equipment comprises the power supply system. The lithium battery positive electrode provided by the invention is better in rate capability, more stable in structure and higher in safety.

Description

technical field [0001] The invention relates to the field of lithium batteries, in particular to a lithium battery positive electrode, a preparation method thereof, a lithium battery, a power supply system and electrical equipment. Background technique [0002] With the large-scale development and application of lithium batteries, people pay more and more attention to their safety issues, and it has also become a research hotspot and difficulty. [0003] At present, a PTC element (semiconductor material or component with a large positive temperature coefficient) is attached to the outside of the battery pack. When the temperature of the battery pack rises to the Curie temperature of the PTC element, the internal resistance of the PTC element increases rapidly, thereby cutting off the current to prevent the battery from As the temperature of the pack rises further, although the PTC element attached to the outside of the battery pack can monitor the thermal runaway caused by e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M4/131H01M4/139H01M4/1391H01M10/052H01M10/42
CPCH01M4/13H01M4/131H01M4/139H01M4/1391H01M10/052H01M10/4235H01M2004/021H01M2004/028Y02E60/10
Inventor 陈敏唐泽勋商士波邹少良
Owner 湖南桑瑞新材料有限公司
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