Additive for preventing thermal runaway and application of additive in secondary lithium metal battery

A lithium metal battery and additive technology, which is applied in secondary batteries, secondary battery repair/maintenance, lithium storage batteries, etc., can solve the problems of unresolved lithium metal negative electrode interface, achieve easy operation, improve electrical conductivity, and improve cycle performance Effect

Active Publication Date: 2018-10-02
QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although scientists have made some progress in this field, the problem of the lithium metal negative electrode interface is still unresolved.

Method used

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  • Additive for preventing thermal runaway and application of additive in secondary lithium metal battery
  • Additive for preventing thermal runaway and application of additive in secondary lithium metal battery
  • Additive for preventing thermal runaway and application of additive in secondary lithium metal battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] In the glove box, add additive P1 and P2 Chloroform solution (mass ratio P1:P2=1:1, 25 wt%) was coated on lithium foil, and after standing and drying, a metal lithium foil containing an additive protective layer (thickness about 10 µm) was obtained. The lithium foil containing the protective layer is used in the lithium-ion battery. Under 1 C charge and discharge, after 100 cycles of the battery, the discharge specific capacity still maintains about 140 mAh / g, and the efficiency is stable above 99%.

[0030]

Embodiment 2

[0032] In the glove box, add additive P3 Add 1M LiTFSI to the EC-DMC solution to obtain the electrolyte. Used in lithium batteries, at 0.5 C charge and discharge, after 100 cycles of the battery, the discharge specific capacity still maintains 125mAh / g.

[0033]

Embodiment 3

[0035] In the glove box, add additive P4 The N,N-dimethylformamide solution (50wt%) was coated on the lithium sheet and left to dry. A lithium sheet containing an additive protective layer (thickness about 20 µm) was used in a lithium-sulfur battery. After 200 cycles of charging and discharging at 0.2 C, the discharge specific capacity remained at 890 mAh / g, and the efficiency remained above 99.5%. .

[0036]

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Abstract

The invention relates to an additive for preventing thermal runaway and an application of the additive in a secondary lithium metal battery. A chain end of the additive contains unsaturated double bonds and a lithium metal negative electrode interface film-forming or flame-retardant structure, and a stable SEI layer can be formed on the surface of a lithium metal negative electrode in the batterycycle process, so that, on one hand, contact of the lithium metal negative electrode and an electrolyte is improved and the lithium metal battery assembled by the lithium metal negative electrode andthe electrolyte has excellent long cycle performance; and on the other hand, the unsaturated double bonds of the additive can absorb heat to be polymerized when the battery is overheated, and the unsaturated double bonds and the contained flame-retardant group play roles in blocking combustion and preventing thermal runaway of the battery. The invention further provides an application of the additive in the lithium metal battery.

Description

technical field [0001] The invention relates to the field of lithium metal batteries, in particular to an additive for preventing thermal runaway and its application in secondary lithium metal batteries. Background technique [0002] Due to the advantages of high energy density and good reliability, lithium-ion batteries have achieved great development in mobile devices, electric vehicles, smart grids and other fields. However, the current commercial lithium-ion batteries still have certain safety hazards, and the low energy density is difficult to meet market demand. The lithium-ion battery with lithium metal as the negative electrode has the highest theoretical specific capacity (3860 mAhg -1 ), the lowest redox potential (-3.04 V vs. standard hydrogen electrode), has become the "holy grail" in the field of energy storage; therefore, the construction of lithium metal batteries has become an important measure to solve the problem that the current energy density of lithium-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/42H01M10/052
CPCH01M10/052H01M10/0567H01M10/4235Y02E60/10
Inventor 崔光磊张焕瑞王鹏董杉木徐红霞
Owner QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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