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High-safety lithium ion battery

A lithium-ion battery and electronic technology, applied in the direction of secondary batteries, battery electrodes, battery pack components, etc., can solve the problems of high thermal runaway risk, waste of space, etc., and achieve high utilization rate, high energy density, and space saving Effect

Inactive Publication Date: 2018-09-14
谷涛
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] Like this, adopt known technology, make the lithium-ion battery of the electronic conductivity of active material layer of electrode sheet distribute evenly, not only wasted space, but also has greater risk of thermal runaway when internal short circuit

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Figure 5 Shown is a schematic diagram of the structure of the multilayer coated electrode sheet of the positive electrode of the lithium ion battery. On the positive electrode current collector 1, the positive electrode inner layer electrode active material sublayer 2A and the positive electrode outer layer electrode active material sublayer 2B are coated sequentially. The key difference between sublayer 2A and sublayer 2B is the difference in the content of the conductive agent and the resulting difference in the electronic conductivity of the sublayers.

[0043] Positive electrode ingredient list A

[0044] Lithium cobalt oxide

sp

ks-6

PVDF

NMP

1000±0.5

18±0.1

12±0.1

21±0.1

450

[0045] Positive electrode ingredient list B

[0046] Lithium cobalt oxide

sp

ks-6

PVDF

NMP

1015±0.5

9±0.1

6±0.1

21±0.1

450

[0047] In the above two tables: sp conductive carbon black, ks-6 cond...

Embodiment 2

[0050] The difference between this embodiment and Embodiment 1 is that, in addition to the positive electrode, each side of the negative electrode current collector 7 is also coated with two layers. Similar to the positive electrode, the electronic conductivity of the two sublayers is also different. The electronic conductivity of the inner layer close to the negative electrode collector 7 is higher, while that of the outer layer is lower. Due to the high electronic conductivity of graphite itself, the electronic conductivity distribution of the negative electrode active material coating is adjusted by adjusting the binder content.

[0051] Negative electrode ingredient list A

[0052] artificial graphite

CMC powder

sp

SBR

NMP+deionized water

1000±0.5

15.8±0.1

10

54±0.1

50+1009

[0053] Negative electrode ingredient list B

[0054] artificial graphite

CMC powder

sp

SBR

NMP+deionized water

970±0.5...

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Abstract

The invention discloses a high-safety lithium ion battery. The electronic conductivity of an electrode active material coating of the battery is distributed from a higher one to a lower one from the surface of a current collector to the outer surface of the coating. The distribution is realized in a multilayer coating manner, slurry of different components is selected on each layer, and the distribution of the electronic conductivity is controlled by changing the content of the conductive agent and adhesive contained in the slurry. Due to the distribution of the electronic conductivity, the short-circuit current can be reduced, and the safety is improved; meanwhile, the electronic conductivity distribution is similar to distribution of normal charging and discharging current, the conductive agent utilization rate is improved on the positive side, and more space can be reserved for the electrode active material, so that the energy density is improved.

Description

technical field [0001] The present application belongs to the field of batteries, and in particular relates to a lithium-ion battery with higher safety when an internal short circuit occurs. Background technique [0002] Lithium-ion batteries are widely used as power sources for consumer electronics and power sources for new energy vehicles due to their long cycle life, high energy density, and environmental protection. But lithium-ion batteries also have safety risks that cannot be ignored. According to reports, there have been many accidents of mobile phones burning and exploding due to bad lithium-ion batteries, involving well-known companies such as Samsung and Apple, and some incidents have led to product recalls; Well-known electric car companies such as BYD and Tesla. [0003] Among the safety risks faced by lithium-ion batteries, the most important and serious one is thermal runaway. The occurrence and development of thermal runaway is closely related to internal ...

Claims

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Application Information

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IPC IPC(8): H01M10/0525H01M2/08H01M4/62H01M10/42H01M50/183
CPCH01M4/624H01M10/0525H01M10/42H01M50/183Y02E60/10
Inventor 谷涛
Owner 谷涛
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