Method for inhibiting metal lithium dendritic crystal growth

A technology of metal lithium and lithium salt, which is applied in the field of inhibiting lithium dendrite growth, can solve the problems of affecting battery safety, large volume change, and reducing battery rate performance, and achieves the effect of avoiding SEI film damage and high conductivity

Inactive Publication Date: 2019-03-22
ZHEJIANG RES INST OF CHEM IND CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] (1) Lithium metal has a relatively low Fermi energy level, and a stable SEI film cannot be formed between it and the electrolyte, so the SEI film is repeatedly formed during the cycle to cause internal friction between lithium metal and the electrolyte;
[0005] (2) The volume change during the deposition/dissolution process of metal lithium is very large, which intensifies the rupture rate of the SEI film on the surface of metal lithium;
[0006] (3) The deposition/dissolution of metal lithium during the cycle is uneven, and it is easy to form metal lithium dendrites, which in turn puncture the separator and affect the safety of the battery
[0009] (2) Sci.Adv.2017; 3:e1601659 reported a method to prevent the growth of metal lithium dendrites by using all-solid electrolytes.

Method used

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  • Method for inhibiting metal lithium dendritic crystal growth
  • Method for inhibiting metal lithium dendritic crystal growth
  • Method for inhibiting metal lithium dendritic crystal growth

Examples

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Effect test

Embodiment 1

[0049] A metal lithium battery, the electrolyte used includes EC and EMC two carbonates as solvents, and LiPF 6 Main lithium salt, LiDF 2 As a lithium auxiliary salt. Its preparation method is: mix ethylene carbonate and ethyl methyl carbonate in a volume ratio of 3:7, and then add LiPF 6 , so that the concentration reaches 1.0mol / L. Then add LiDF to the electrolyte 2 As a lithium-assisting salt, the mass ratio in the electrolyte is 0.1%, so as to obtain an electrolyte for a metal lithium battery.

Embodiment 2

[0051] A metal lithium battery, the electrolyte used includes EC and EMC two carbonates as solvents, and LiPF 6 LiFSI is the main lithium salt, and LiFSI is the assistant lithium salt. Its preparation method is: mix ethylene carbonate and ethyl methyl carbonate in a volume ratio of 3:7, and then add LiPF 6 , so that the concentration reaches 1.0mol / L. Afterwards, LiFSI is added into the electrolyte solution as a lithium-assisting salt, so that its mass ratio in the electrolyte solution is 0.5%, so as to obtain the metal lithium battery electrolyte solution.

Embodiment 3

[0053] A metal lithium battery, the electrolyte used includes EC and EMC two carbonates as solvents, and LiPF 6 Main lithium salt, LiDF 2 and LiFSI as lithium helper salt. Its preparation method is: mix ethylene carbonate and ethyl methyl carbonate in a volume ratio of 3:7, and then add LiPF 6 , so that the concentration reaches 1.0mol / L. Then add LiDF to the electrolyte 2 and LiFSI, making LiDF 2 The mass ratios of LiFSI and LiFSI in the electrolyte are 0.1% and 0.5%, respectively, to obtain the metal lithium battery electrolyte.

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Abstract

The invention provides a method for inhibiting the metal lithium dendritic crystal growth, which is achieved by using electrolyte containing a main lithium salt and an auxiliary lithium salt, whereinthe auxiliary lithium salt is selected from at least one of lithium difluorophosphate and lithium bis(fluorosulfonyl)imide. The method provided by the invention can inhibit the metal lithium dendriticcrystal growth; the stability of a metal lithium negative electrode SEI film is improved, so that the safety of a metal lithium battery is improved.

Description

technical field [0001] The invention relates to a method for inhibiting the growth of lithium dendrites, in particular to a method for inhibiting the growth of lithium dendrites in lithium ion batteries. Background technique [0002] Lithium-ion batteries are widely used in various fields, such as various portable electronic devices, due to their advantages such as high working voltage, high energy density, low self-discharge rate, no memory effect, long cycle life and no pollution. In the national strategic plan, electric vehicles and high-energy-density vehicle batteries occupy an important position, and are key industries supported and developed by the state. At the same time, with the rapid development of clean energy such as wind energy, solar energy and biomass energy, the development of energy storage batteries used to convert these clean energy into the grid has also been accelerated, and lithium batteries are also an important product of energy storage batteries. H...

Claims

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Application Information

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IPC IPC(8): H01M10/0568H01M10/0525
CPCH01M10/0525H01M10/0568H01M2300/0025Y02E60/10
Inventor 马国强丁元胜董经博沈旺
Owner ZHEJIANG RES INST OF CHEM IND CO LTD
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