Li-ion battery and its electrode structure

A lithium-ion battery and electrode structure technology, which is applied to battery electrodes, non-aqueous electrolyte battery electrodes, batteries, etc., can solve the problems of insufficient sensitivity of temperature sensing and inability to sense the protective effect in real time, and achieve the improvement of battery safety performance. Safety, effect of suppressing charge and discharge

Active Publication Date: 2016-12-28
IND TECH RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The external PTC design is applied to the lithium-ion battery, which can only prevent overcharging, but it is not sensitive enough for temperature sensing. When the internal temperature of the battery is generated, it cannot be sensed immediately for protection.
Even the PTC coated on the electrode plate can improve the above problems, but it only has a one-stage design to block the electronic channel, which can only directly block the electronic channel when the battery temperature rises.

Method used

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  • Li-ion battery and its electrode structure
  • Li-ion battery and its electrode structure
  • Li-ion battery and its electrode structure

Examples

Experimental program
Comparison scheme
Effect test

experiment example 1

[0047] First, 0.4mol% niobium doped (Nb doped) Ba 0.9 Sr 0.1 TiO 3 It is mixed with polyethylene (PE) at a weight ratio of 8:2, 6:4, 5:5, 2:8, and then 5wt% of conductive particles (Super ), after mixing it evenly and making it into a coating, then measuring the change of its impedance value with the increase of temperature, the results are shown in image 3 .

[0048] From image 3 It can be seen that the coating in Experimental Example 1 can achieve two stages of impedance change. Although the ratio of PPTC material to CPTC material is about 2:8~8:2 from Experimental Example 1, once the material system is changed, the ratio may not necessarily be in this range.

experiment example 2

[0050] First, 0.4mol%Nb doped Ba 0.9 Sr 0.1 TiO 3 Mix with polyethylene (PE) in a weight ratio of 6:4, and then add 5wt% conductive particles (Super ), after mixing it evenly and making it into a coating, then measuring the change of its impedance value with the increase of temperature, the results are shown in Figure 4 . From Figure 4 The impedance value change of two stages can also be achieved.

experiment example 3

[0052] First, 0.4mol%Nb doped Ba 0.85 Sr 0.15 TiO 3 Mix with polyethylene (PE) at a weight ratio of 2:1, and then add 10wt% conductive particles (Super ), after mixing it evenly and making it into a coating, then measuring the change of its impedance value with the increase of temperature, the results are shown in Figure 5 ,From Figure 5 The change of the resistance value of the two sections can also be observed.

[0053] Figure 6 is a schematic cross-sectional view of a lithium-ion battery according to another embodiment of the present invention.

[0054] exist Figure 6 Among them, the lithium-ion battery at least includes an electrolyte solution 604 and an electrode group, and the electrode group includes a positive electrode 600, a negative electrode 602, and a separator 606, and the separator 606 is located between the positive electrode 600 and the negative electrode 602, wherein the positive electrode 600 and the negative electrode 602 can be figure 1 The el...

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Abstract

The invention discloses a lithium ion battery and its electrode structure. The electrode structure includes a current collecting base material, an electrode active material layer on the current collecting base material and a composite thermosensitive coating. The composite thermosensitive coating is interposed between the current collecting substrate and the electrode active layer. The composite thermosensitive coating includes at least two or more positive temperature coefficient (positive temperature coefficient; PTC) materials, so that the composite thermosensitive coating has adjustable stage temperature rise resistance characteristics.

Description

technical field [0001] The invention relates to a lithium ion battery technology, and in particular to a lithium ion battery with adjustable stage temperature rise resistance and its electrode structure. Background technique [0002] Positive temperature coefficient (positive temperature coefficient, PTC) generally refers to materials or components with a large positive temperature coefficient, usually referred to as PTC thermistor, also known as resettable fuse, which is divided into polymer positive temperature coefficient ( polymer positive temperature coefficient (PPTC) material and ceramic positive temperature coefficient (ceramic positive temperature coefficient, CPTC) material. Among them, the PPTC material has been studied and applied in the design of the external module of the battery, and its composition includes polyethylene (PE) polymers and conductive particles. Under normal conditions (low temperature), the conductive particles form a chain-like conductive cha...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/13H01M10/0525
CPCH01M4/13H01M10/0525H01M10/4235H01M4/366H01M4/62H01M4/622H01M4/625H01M2200/106Y02E60/10
Inventor 朱文彬吕明怡赖冠霖彭成鉴周子琪刘达人杨长荣
Owner IND TECH RES INST
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