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Electrolyte effectively compatible with Si negative electrode and preparation method and application thereof

An electrolyte and negative electrode technology, applied in the field of electrolyte and its preparation, can solve the problems of volume change and formation of unstable SEI film, limit the practical application of Si-based negative electrode materials, etc., and achieve good long-term cycle performance, good performance, and convenient preparation. Effect

Pending Publication Date: 2022-08-09
SHANGHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with the commercial graphite anode, although the Si anode has a high specific capacity, a lower lithium ion intercalation voltage platform, is environmentally friendly and has abundant reserves, however, the Si anode will undergo a huge volume change and The formation of unstable SEI film limits the practical application of Si-based anode materials in Li-ion batteries

Method used

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  • Electrolyte effectively compatible with Si negative electrode and preparation method and application thereof
  • Electrolyte effectively compatible with Si negative electrode and preparation method and application thereof
  • Electrolyte effectively compatible with Si negative electrode and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0033] 1. Preparation of Si anode:

[0034] In the Si negative electrode, Si, sodium alginate binder and acetylene black are composed by mass ratio of 70:15:15. First, the Si material and sodium alginate are mixed in a beaker, a certain amount of NMP is added dropwise, stirred for 10 minutes, and then Add acetylene black and stir for 20 minutes to make the three fully mixed evenly, and finally dry in the air under ultraviolet light for 5 hours, and dry in vacuum at 120°C for use.

[0035] 2. Preparation of electrolyte:

[0036] In the glove box, first put the lithium salt LiPF 6 with ionic liquid (PP 13* TFSI) was mixed in a molar ratio of 3:1, and then ethylene carbonate (EC) was added to make LiPF 6 with ionic liquid (PP 13* TFSI) with a total molar concentration of 1.8 mol / L, shake well and let stand for 24 hours to obtain the required electrolyte.

[0037] 3. Battery assembly:

[0038] The Si / Li half-cell was assembled with the above electrolyte and the prepared Si a...

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Abstract

The invention relates to a Si / Li half-battery electrolyte, in particular to an electrolyte effectively compatible with a Si negative electrode and a preparation method and application thereof, and the electrolyte comprises a lithium salt, an organic solvent and an ionic liquid; the ionic liquid is piperidine ionic liquid of which cations contain double bonds; the electrolyte is obtained by dissolving a lithium salt in a mixed solvent formed by mixing an organic solvent and an ionic liquid, uniformly shaking and standing, the electrolyte is used for preparing a Si / Li half battery. Compared with the prior art, the electrolyte provided by the invention has the advantages that on the basis of low melting point, low viscosity and high safety, the compatibility of the electrolyte and a Si negative electrode in the battery can be improved, the initial coulombic efficiency of the Si / Li battery adopting the electrolyte provided by the invention can reach 83.53%, and the battery capacity can still be kept at about 1200 mAh / g after 100 cycles.

Description

technical field [0001] The invention relates to a Si / Li half-battery electrolyte, in particular to an electrolyte that is effectively compatible with a Si negative electrode and a preparation method and application thereof. Background technique [0002] With the wide application of electric vehicles, the requirements for high energy density and power density of lithium-ion batteries are getting higher and higher. Increasing the capacity of lithium-ion batteries is one of the effective ways to improve the energy density of batteries. Compared with commercial graphite anodes, although Si anodes have a high specific capacity, a lower lithium-ion intercalation voltage platform, are environmentally friendly and have abundant reserves, however, Si anodes suffer from huge volume changes during charging and discharging. The formation of unstable SEI films limits the practical application of Si-based anode materials in Li-ion batteries. [0003] From the perspective of the electroly...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0569H01M10/0525H01M4/38
CPCH01M10/0569H01M10/0525H01M4/386Y02E60/10
Inventor 胡健高喜梅
Owner SHANGHAI INST OF TECH