Safe lithium ion battery

A lithium-ion battery, safe technology, applied in the direction of battery electrodes, secondary batteries, battery components, etc.

Active Publication Date: 2014-03-12
FIRST NEW ENERGY GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, none of these methods can fundamentally solve safety issues such as battery fire or explosion.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The positive active material is LiFePO 4 , The binder uses PVDF. Dissolve PVDF in the solvent DMF to prepare a PVDF solution, put the positive electrode active material and the composite conductive polymer material as a conductive agent into the solvent, and mix well to make a positive electrode slurry, which is composed of LiFePO 4 : PVDF: Composite conductive polymer material = 90:3:7. Coating and sheeting the prepared positive electrode slurry. The composite conductive polymer material is a composite conductive polymer obtained by mixing 15 wt% conductive carbon black, 8 wt% conductive graphite, 42 wt% polypropylene, and 35 wt% polyethylene at 140 °C for 30 min Material.

[0019] The negative electrode active material adopts graphite, and the binder adopts CMC. Dissolve CMC in water to prepare CMC solution, add graphite into the solvent, mix well, and its composition is graphite:CMC=93:7. The prepared negative electrode slurry is coated and made into sheet...

Embodiment 2

[0023] In embodiment 1, the positive electrode slurry composition is changed to LiFePO 4 : PVDF: Composite conductive polymer material = 95:3:2.

Embodiment 3

[0025] In embodiment 1, the positive electrode slurry composition is changed to LiFePO 4 : PVDF: Composite conductive polymer material = 90:5:5.

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Abstract

The invention relates to a safe lithium ion battery, and provides a high safety lithium ion battery which can thoroughly solve problems of fire proofing and explosion proofing without reducing battery charge and discharge performance, so as to solve technical problems of battery fire and explosion. The battery of the invention comprises a positive plate, a diaphragm and a negative plate, wherein the diaphragm is between the positive plate and the negative plate. The positive plate includes a positive current collector and a positive slurry coated on the positive current collector; the negative plate includes a negative current collector and a negative slurry coated on the negative current collector; and the positive slurry and / or the negative slurry contain / contains a conductive agent. Under abnormal conditions such as rapid rise of current or temperature, a resistivity of the lithium ion battery of the present invention will rise as well to destroy a conductive network and prevent battery thermal runaway, so as to play a role of lithium ion battery thermal runaway prevention. Therefore, safety performance of the lithium ion battery is enhanced greatly, and battery safe problem is solved from the source.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and more specifically the invention relates to the field of lithium ion batteries with high safety performance. Background technique [0002] Lithium-ion batteries have been widely used in mobile phones, notebook computers, PDAs, digital cameras, MP3 and other fields because of their advantages such as high working voltage, high energy density, long cycle life, small self-discharge, no memory effect and low environmental pollution. , has become an indispensable part of various modern communication equipment and electronic equipment. [0003] With the renewal and development of technology, the development of various electrical equipment puts forward higher requirements on the performance of batteries, requiring batteries to have thinner, lighter, higher energy density and power density, and higher safety. Especially in recent years, due to the shortage of energy sources and the dev...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0525H01M4/62H01M2/16
CPCY02E60/122Y02E60/10
Inventor 张贵萍祝利民曹振东黄子欣李锦运李振宋佑蔡道国
Owner FIRST NEW ENERGY GRP CO LTD
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