A internal oxygen self-absorption safe lithium battery

A technology for oxygen absorption and lithium batteries, which is applied in secondary batteries, battery electrodes, non-aqueous electrolyte storage batteries, etc., can solve the problems of thermal runaway and fire of lithium batteries, and achieve the effect of improving cycle life and avoiding fire from thermal runaway

Active Publication Date: 2018-12-18
TIANJIN ENERGIES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if an external heat source continues to heat the battery cell, the lithium battery will eventually trigger thermal runaway and fire

Method used

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  • A internal oxygen self-absorption safe lithium battery
  • A internal oxygen self-absorption safe lithium battery
  • A internal oxygen self-absorption safe lithium battery

Examples

Experimental program
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Effect test

Embodiment 1

[0054] An internal oxygen self-absorption safety lithium battery, the lithium battery includes a positive electrode sheet, a negative electrode sheet; the positive electrode sheet is made of raw materials comprising the following parts by weight: LiNi 0.5 co 0.2 mn 0.3 o 2 94kg, carbon black 3kg, PVDF 2kg, NMP 70kg, activated carbon 2kg; the pore size range of activated carbon is 0.3-0.6nm; the size of the oxygen absorbing additive is 10-100um;

[0055] The negative electrode sheet is made of the following raw materials in parts by weight: graphite 50kg, CMC 0.80kg, SBR 1.0kg, carbon black 0.7kg, deionized water 60kg.

[0056] The lithium battery also includes a membrane structure, which is a microporous diaphragm with a polyolefin substrate thickness of 12um and an aluminum oxide coating thickness of 4um.

[0057] The lithium battery also includes an electrolyte, which mixes EC, PC, and EMC at a volume ratio of 35:5:60, and adds LiPF at a lithium salt concentration of 1.0M...

Embodiment 2

[0061] An internal oxygen self-absorption safety lithium battery, the lithium battery includes a positive electrode sheet, a negative electrode sheet; the positive electrode sheet is made of raw materials comprising the following parts by weight: LiNi 0.5 co 0.2 mn 0.3 o 2 94kg, carbon black 3kg, PVDF 2kg, NMP 70kg, activated carbon 4kg; the pore size of the activated carbon is 0.3-0.6nm; the size of the oxygen absorbing additive is 10-100um;

[0062] The negative electrode sheet is made of the following raw materials in parts by weight: graphite 50kg, CMC 0.80kg, SBR 1.0kg, carbon black 0.7kg, deionized water 60kg.

[0063] The lithium battery also includes a membrane structure, which is a microporous diaphragm with a polyolefin substrate thickness of 12um and an aluminum oxide coating thickness of 4um.

[0064] The lithium battery also includes an electrolyte, which mixes EC, PC, and EMC at a volume ratio of 35:5:60, and adds LiPF at a lithium salt concentration of 1.0M ...

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Abstract

The invention provides an internal oxygen self-absorption safe lithium battery. The lithium battery comprises a positive electrode sheet and a negative electrode sheet. The positive electrode sheet ismade of raw materials in following parts by weight: 90to 97 parts of a positive electrode active material, 0.5 to 4 parts of a positive electrode conductive agent 0.5 to 3 parts of a positive electrode binder and 15 to 70 parts of a positive solvent; the positive electrode sheet further comprises an oxygen absorption additive, wherein the addition amount of an oxygen absorption additive is 0.01%to 10% of the total amount of the positive electrode active material, the positive electrode conductive agent and the positive electrode binder. The internal oxygen self-absorption safe lithium battery of the invention is characterized in that the oxygen absorption additive uniformly mixed in a positive electrode material, when the positive elctrode active material is decomposed and releases oxygen at high temperature, the surrounding oxygen can be quickly captured, the oxygen concentration in the lithium battery when the lithium battery is out of control is reduced, so that the lithium battery cannot meet the ignition conditions, and the lithium battery is prevented from thermal runaway fire.

Description

technical field [0001] The invention belongs to the field of lithium batteries, in particular to an internal oxygen self-absorption safety lithium battery. Background technique [0002] With the rapid development of the new energy vehicle market, lithium batteries have been widely used. With the promotion of new energy vehicles, people have put forward higher requirements for new energy vehicles. In order to meet the high endurance requirements, it is necessary to increase the energy density of the battery. At present, the main technical route is to use high-nickel, high-voltage positive electrode materials, silicon negative electrode materials, etc., while the high gram capacity of positive electrode materials is increased, but at the same time, the problem is the decline in thermal stability. The problem that arises is that the safety of high energy density batteries is reduced. [0003] It has been verified that the thermal runaway of a lithium battery causes a fire. G...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M10/42H01M10/058H01M10/0525
CPCH01M4/628H01M10/0525H01M10/058H01M10/4235Y02E60/10Y02P70/50
Inventor 李天龙高秀玲王驰伟
Owner TIANJIN ENERGIES
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