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Lithium metal battery and its electrolyte

A lithium metal battery and electrolyte technology, which is applied in the field of lithium metal batteries and their electrolytes, can solve the problems of low battery conductivity and inability to meet the battery requirements, and achieves suppression of concentration polarization, slowing down migration speed, and improving cycle performance. The effect of safety features

Active Publication Date: 2019-12-13
CONTEMPORARY AMPEREX TECH CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the strong ionic bonds between the anions and cations of this type of electrolyte, it is difficult to dissociate, resulting in low conductivity of the battery, which cannot meet the needs of the battery.

Method used

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  • Lithium metal battery and its electrolyte
  • Lithium metal battery and its electrolyte
  • Lithium metal battery and its electrolyte

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] (1) Preparation of positive electrode sheet for lithium metal battery

[0046] Dissolve polyvinylidene fluoride (PVDF) in N-methylpyrrolidone (NMP), add lithium cobaltate (LCO) used as a positive electrode active material and acetylene black used as a positive electrode conductive agent and mix thoroughly to prepare a positive electrode slurry , wherein the amount of PVDF is 5 parts by weight per 100 parts by weight of LCO, and the amount of acetylene black is 2 parts by weight per 100 parts by weight of LCO; then the positive electrode slurry is applied to both sides of a 12 μm thick positive electrode current collector aluminum foil, and Air-dried at 85° C. for 20 h, rolled up to prepare a positive electrode sheet for a lithium metal battery.

[0047] (2) Preparation of electrolyte for lithium metal batteries

[0048] LiPF to ethylene carbonate (EC) and propylene carbonate (PC) (EC:PC=1:1) 6 (concentration 1mol / L) boron trifluoride with a mass ratio of 0.1% is added...

Embodiment 2

[0052] A lithium metal battery was assembled according to the method of Example 1, except that the mass percentage of boron trifluoride in the electrolyte used was 1%.

Embodiment 3

[0054] A lithium metal battery was assembled according to the method of Example 1, except that the mass percentage of boron trifluoride in the electrolyte used was 5%.

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Abstract

A lithium metal battery and an electrolyte thereof are provided. The electrolyte comprises a nonaqueous solvent, a lithium salt and an additive. The additive is borane type compounds and / or cyclo borane type compounds, wherein R<1>, R<2>, R<3> and R<4> are independently selected from F, C1-C8 alkyl, aryl, a carboxylate group, a phosphate group, a sulfonate group, fluoro-substituted aryl and fluoro-substituted C1-C8 alkyl, and R<5> is selected from C1-C8 cycloalkyl. The lithium metal battery comprises the electrolyte. The electrolyte effectively inhibits lithium dendritic growth on anode surfaces and improves cyclic performance and safety performance of the lithium metal battery. The general structure formula of the borane type compounds is shown in description. The general structure formula of the cyclo borane type compounds is shown in description.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a lithium metal battery and an electrolyte thereof. Background technique [0002] At present, the negative electrode active material of commercial lithium-ion batteries is mainly graphite, but the mass specific capacity of graphite is limited, and the space for increasing the volume specific capacity is also very small, which seriously limits the further improvement of the gravimetric energy density and volumetric energy density of lithium-ion batteries. promote. With the current development of consumer electronics and electric vehicle technology, it is imperative to develop battery systems with higher energy density. [0003] Lithium metal has high mass energy density (3860Ah / kg) and volumetric energy density (2050Ah / L), so it is often used as the negative electrode of lithium metal batteries. However, due to the uneven deposition of lithium metal during repeated charging, t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0567H01M10/052
CPCY02E60/10
Inventor 洪响钟开富湛英杰江德顺吴冰彬
Owner CONTEMPORARY AMPEREX TECH CO