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Lithium ion battery electrolyte and lithium ion battery

A lithium-ion battery and electrolyte technology, applied in secondary batteries, circuits, electrical components, etc., can solve the problems of continuous decomposition and consumption of electrolyte, irreversible loss of active lithium, damage to SEI film, affecting battery cycle performance, etc., and achieve excellent stability. Electrochemical performance, effect of high energy density

Pending Publication Date: 2022-04-01
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The graphite negative electrode of traditional lithium-ion batteries can no longer meet the existing needs. Silicon-based negative electrode materials are gradually becoming the best choice for improving the energy density of the negative electrode due to their abundant reserves and ultra-high theoretical specific capacity. They are the most promising next-generation battery negative electrodes. one of the materials
[0003] However, silicon-based negative electrode materials also have obvious shortcomings, that is, the continuous damage and repair of the SEI film on the surface of silicon particles due to the huge volume change of silicon particles when deintercalating lithium, resulting in continuous decomposition and consumption of electrolyte and active lithium. The irreversible loss, which in turn affects the cycle performance of the battery

Method used

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  • Lithium ion battery electrolyte and lithium ion battery
  • Lithium ion battery electrolyte and lithium ion battery
  • Lithium ion battery electrolyte and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] Preparation of Electrolyte 1 and Experimental Battery 1

[0058] (1) Preparation of Electrolyte 1

[0059] In an argon glove box with moisture content ≤ 10ppm, mix ethylene carbonate (EC) with ethyl methyl carbonate (EMC), diethyl carbonate (DEC), and fluoroethylene carbonate (FEC) according to the mass ratio EC:EMC : DEC: FEC = 3: 4: 2: 1 to mix evenly, then slowly add lithium salt, namely lithium hexafluorophosphate, after the lithium salt is completely dissolved, add divinylsulfonic acid compound 1 with a mass fraction of 1% (shown in formula 1 ) and vinylene carbonate with a mass fraction of 1%, and after stirring evenly, an electrolyte 1 is obtained, wherein the mass concentration of lithium hexafluorophosphate in the entire electrolyte is 14%.

[0060]

[0061] (2) Preparation of positive electrode sheet

[0062] Mix positive electrode active material NCM, conductive agent acetylene black, and binder polytetrafluoroethylene according to the mass ratio NCM: ac...

Embodiment 2

[0068] Electrolyte 2 and experimental battery 2 were prepared.

[0069] Compared with Example 1, the only difference is that in the electrolyte preparation process, after the lithium salt is completely dissolved, 3% of the divinylsulfonic acid compound 1 (shown in formula 1) and 1% of the mass fraction are added. of vinylene carbonate.

Embodiment 3

[0071] Electrolyte 3 and experimental battery 3 were prepared.

[0072] Compared with Example 1, the only difference is that in the electrolyte preparation process, after the lithium salt is completely dissolved, 5% of the divinylsulfonic acid compound 1 (shown in formula 1) and 1% of the mass fraction are added. of vinylene carbonate.

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Abstract

The invention discloses a lithium ion battery electrolyte and a lithium ion battery, and relates to the technical field of lithium ion batteries, the lithium ion battery electrolyte comprises the following components: a lithium salt, an organic solvent, a divinyl sulfonic acid additive and a film-forming additive; wherein the divinylsulfonic acid additive is selected from at least one of compounds with the following structural formula. According to the invention, the divinylsulfonic acid additive is added into the electrolyte, and rich carbon-carbon double bonds in the molecular structure of the divinylsulfonic acid additive can form a layer of stable SEI film with relatively good toughness on the surface of an electrode through a cross-linking reaction; and the problem of large expansion and shrinkage in the charging and discharging process of the silicon negative electrode can be better solved, so that the silicon negative electrode cell has excellent and stable electrochemical performance.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a lithium ion battery electrolyte and a lithium ion battery. Background technique [0002] Anode materials are an important part of lithium-ion batteries, which directly affect key indicators such as energy density, cycle life, and safety performance of batteries. With the continuous improvement of the cruising range requirements of new energy vehicles in practical applications, power battery-related materials are also developing towards higher energy densities. The graphite negative electrode of traditional lithium-ion batteries can no longer meet the existing needs. Silicon-based negative electrode materials are gradually becoming the best choice for improving the energy density of the negative electrode due to their abundant reserves and ultra-high theoretical specific capacity. They are the most promising next-generation battery negative electrodes. one of the ...

Claims

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Application Information

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IPC IPC(8): H01M10/0566H01M10/0567H01M10/0525
Inventor 马云翔李国庆梁大宇
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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