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An internal oxygen self-absorption safe lithium battery

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

Active Publication Date: 2021-08-03
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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  • An internal oxygen self-absorption safe lithium battery
  • An internal oxygen self-absorption safe lithium battery
  • An internal oxygen self-absorption safe lithium battery

Examples

Experimental program
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Effect test

Embodiment 1

[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 94 kg, carbon black 3 kg, PVDF 2kg, NMP 70kg, activated carbon 2kg; the pore size of 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 1.0 M ...

Embodiment 2

[0068] 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 94 kg, 3 kg of carbon black, 2 kg of PVDF, 70 kg of NMP, 4 kg of activated carbon; the pore size of the activated carbon is 0.3-0.6nm; the size of the oxygen absorbing additive is 10-100um;

[0069] 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.

[0070] 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.

[0071] 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 conce...

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Abstract

The invention provides an internal oxygen self-absorption safety lithium battery, the lithium battery includes a positive electrode sheet and a negative electrode sheet; the positive electrode sheet is made of raw materials including the following parts by weight: 90-97 parts of positive electrode active material, positive electrode conductive 0.5-4 parts of the positive electrode binder, 0.5-3 parts of the positive electrode binder, and 15-70 parts of the positive electrode solvent; the positive electrode sheet also includes an oxygen absorbing additive, and the addition amount of the oxygen absorbing additive is the positive electrode active material, the positive electrode conductive agent 0.01‑10% of the total amount with the positive electrode binder. The internal oxygen self-absorbing safety lithium battery described in the present invention is an oxygen absorbing additive uniformly mixed in the positive electrode material. When the positive electrode active material decomposes at high temperature and releases oxygen, it can quickly capture the surrounding oxygen, and reduce the thermal runaway of the lithium battery. If the oxygen concentration is low, the lithium battery cannot meet the fire conditions, and the thermal runaway of the lithium battery can be avoided.

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 Patents(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