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Lithium supplementing composition, lithium supplementing electrolyte and lithium supplementing method for lithium secondary battery

A lithium secondary battery and electrolyte technology, which is applied in the field of lithium supplementation composition and lithium secondary battery lithium supplementation, can solve the problems of low Coulombic efficiency, poor cycle performance, and high activity of lithium supplementation, so as to alleviate the low Coulombic efficiency and cost Low, the effect of ensuring production safety

Inactive Publication Date: 2021-03-05
GUANGZHOU TINCI MATERIALS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] One of the objects of the present invention is to provide a lithium supplement composition. After the lithium supplement composition is used in a lithium supplement electrolyte, the lithium supplement electrolyte has high lithium supplement activity and can effectively solve the problem of lithium ion in silicon-based negative electrodes. The problem of low coulombic efficiency and poor cycle performance of the battery for the first time significantly improves the energy density of lithium-ion batteries

Method used

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  • Lithium supplementing composition, lithium supplementing electrolyte and lithium supplementing method for lithium secondary battery
  • Lithium supplementing composition, lithium supplementing electrolyte and lithium supplementing method for lithium secondary battery
  • Lithium supplementing composition, lithium supplementing electrolyte and lithium supplementing method for lithium secondary battery

Examples

Experimental program
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Effect test

Embodiment 1

[0046] 0.1wt% lithium supplement compound lithium oxalate, 0.5wt% co-solvent tris(pentafluorophenyl) phosphine, 86.9wt% solvent (EC:EMC=3:7, mass ratio) and 12.5wt% lithium hexafluorophosphate were formulated into a working electrolyte liquid.

[0047] Use this electrolyte to assemble a lithium-ion battery, and the positive electrode material is LiNixCoyMnzO 2 (x=0.8; y=0.8; z=0.1), the negative electrode is SiO and graphite, the mass ratio of SiO and graphite is 1:9, the nominal capacity of the battery is 2Ah, and the liquid injection volume is 7g.

Embodiment 2

[0049] The remaining parameters are the same as in Example 1, except that the addition of lithium oxalate is 0.2wt%, tris(pentaphenyl)boron is 0.5wt%, and the solvent (EC:EMC=3:7, mass ratio) is 86.8wt%.

Embodiment 3

[0051]The remaining parameters are the same as in Example 1, except that the addition of lithium oxalate is 0.3wt%, tris(pentaphenyl)boron is 0.5wt%, and the solvent (EC:EMC=3:7, mass ratio) is 86.7wt%.

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Abstract

The invention belongs to the technical field of lithium ion batteries, and provides a lithium supplementing composition which comprises a lithium supplementing compound and a cosolvent, and the lithium supplementing compound is lithium nitride and / or lithium oxalate; and the cosolvent is at least one of tris (pentafluorophenyl) borane, tris (pentafluorophenyl) phosphine and tris (pentafluorophenyl) silane. After the lithium supplementing composition is used for the lithium supplementing electrolyte, the lithium supplementing electrolyte has high lithium supplementing activity, the problems oflow initial coulombic efficiency and poor cycle performance of the silicon-based negative electrode lithium ion battery can be effectively solved, and the energy density of the lithium ion battery isobviously improved. Meanwhile, the invention also provides a lithium supplementing method based on the lithium supplementing electrolyte.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a lithium-replenishing composition, a lithium-replenishing electrolyte, and a lithium-replenishing method for a lithium secondary battery. Background technique [0002] The energy crisis is one of the most important issues facing human society at present, and the collection, storage and transportation of new clean energy has attracted the attention of the whole society. As an important medium for electric energy conversion and storage, lithium-ion batteries have the advantages of high energy density, good cycle stability, wide working potential window, high safety, and environmental friendliness. They are widely used in portable electronic products, large-scale energy storage, and electric vehicles. and other fields. With the rapid development of new energy vehicles, the improvement of cruising range puts forward higher requirements on the energy density of batteri...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0568H01M10/0569H01M10/42H01M10/0525
CPCH01M10/0525H01M10/0567H01M10/0568H01M10/0569H01M10/4235H01M2300/0025H01M2300/0028Y02E60/10
Inventor 孙艳光刘蕊全家岸周立马美朋
Owner GUANGZHOU TINCI MATERIALS TECH
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