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Lithium-ion secondary battery and anode pole piece thereof

A positive pole piece and secondary battery technology, applied in secondary batteries, battery electrodes, circuits, etc., can solve the safety problems of lithium-ion secondary batteries, affect the charging performance of batteries, and deteriorate the low-temperature performance of batteries. Improved thermal safety, good safety performance, and the effect of preventing further rise in temperature

Active Publication Date: 2014-04-09
DONGGUAN AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the disadvantage of this type of material is that the lithium ion secondary battery containing this type of material has safety problems, especially when the battery is overcharged, overdischarged or short-circuited, the internal temperature of the battery will rise, and it may catch fire. or explode
This can improve the safety performance of the battery to a certain extent, but the improvement effect is not significant enough
In the patent application number WO2010064755A1, the researchers used graphite with a core-shell structure as the negative electrode active material, wherein the graphite is a core structure, and the shell is a thermistor (PTC) with a positive temperature coefficient. Although this can also improve The safety performance of the battery, but because PTC is coated on the graphite surface, it may affect the charging performance of the battery, causing the risk of lithium precipitation on the negative electrode sheet, resulting in poor low-temperature performance of the battery, and even because of the existence of lithium dendrites. Puncture the separator, causing a short circuit in the battery, causing safety problems

Method used

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  • Lithium-ion secondary battery and anode pole piece thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Preparation of the positive electrode active material: lithium manganese phosphate (LiMnPO 4 , the average particle size is 100nm) is the active material of the core layer, BaTiLa 0.1 o 3 (the average particle diameter is 10nm) is the shell active material, and the positive electrode active material with the core-shell structure is prepared. Firstly, 1 part by weight of BaTiLa 0.1 o 3 with 99 parts by weight of LiMnPO 4Mix, then process at 2500 rpm for 4 minutes, and finally process at 450° C. for 5 hours, so as to prepare a positive electrode active material with a core-shell structure.

[0032] Preparation of the positive electrode sheet: the above-mentioned positive electrode active material with a core-shell structure is used as the active material, and its weight content (relative to the weight of the powder, the same below) is 90%; polyvinylidene fluoride (PVDF) is used as the binder , and its weight content is 5%; with carbon black as the conductive agent, i...

Embodiment 2

[0038] Different from Example 1 is the preparation of the positive electrode active material:

[0039] Lithium manganese phosphate (LiMnPO 4 , with an average particle size of 1000nm) is the active material of the core layer, BaTiSr 0.1 o 3 (average particle size of 1nm) and conductive carbon as shell active material (conductive carbon and BaTiSr 0.1 o 3 The mass ratio is 2:98) to prepare a positive electrode active material with a core-shell structure. Firstly, 0.1 parts by weight of BaTiSr 0.1 o 3 and conductive carbon mixture with 99.9 parts by weight of LiMnPO 4 Mix, then process at 2500 rpm for 4 minutes, and finally process at 450° C. for 5 hours, so as to prepare a positive electrode active material with a core-shell structure.

[0040] The rest are the same as in Embodiment 1, and will not be repeated here.

Embodiment 3

[0042] Different from Example 1 is the preparation of the positive electrode active material:

[0043] lithium nickel phosphate (LiNiPO 4 , the average particle size is 5000nm) is the active material of the core layer, BaTiPb 0.2 o 3 (average particle size of 100nm) and carbon nanotubes as the shell active material (carbon nanotubes and BaTiPb 0.2 o 3 The mass ratio is 3:97) as the shell active material, and the positive electrode active material with the core-shell structure is prepared. First, 2 parts by weight of BaTiPb were respectively applied using dry coating equipment 0.2 o 3 The mixture with carbon nanotubes was mixed with 98 parts by weight of lithium nickel phosphate, then treated at 2500 rpm for 4 minutes, and finally at 450° C. for 5 hours, so as to prepare a positive electrode active material with a core-shell structure.

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Abstract

The invention belongs to the technical field of lithium-ion secondary batteries and particularly relates to an anode pole piece of a lithium-ion secondary battery. The anode pole piece comprises an anode current collector and an anode active matter layer coated on the surface of the anode current collector, wherein the anode active matter layer comprises an anode active matter, a conductive additive and an adhesive; and the anode active matter is provided with a nuclear shell structure composed of a nuclear layer active matter and a shell active matter, the nuclear layer active matter is LiaMbPO4, the shell active matter is BaTiMx2o3, and the shell active matter accounts for 0.1wt%-5wt% of the anode active matter. Compared with the prior art, the anode pole piece can be used for maximally improving the safety performance of the battery. Furthermore, the invention also discloses a lithium-ion secondary battery containing the anode pole piece.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion secondary batteries, and more specifically, the invention relates to a lithium-ion secondary battery with high safety performance and a positive pole piece thereof. Background technique [0002] At present, with the increase of environmental pressure and the high price of oil, the application of electric vehicles has attracted more and more people's attention and expectations, and the development of electric vehicles has become an inevitable trend. As the preferred power source for electric vehicle batteries, lithium-ion secondary batteries will also have increasingly broad market prospects with the development of electric vehicles. [0003] At present, lithium-ion secondary batteries used in power batteries generally use lithium iron phosphate as the positive electrode active material. Recently, lithium manganese phosphate and lithium cobalt phosphate have also been used as positive electrod...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/1397H01M4/58H01M10/0525
CPCY02E60/122Y02E60/10
Inventor 魏建良朱华
Owner DONGGUAN AMPEREX TECH