Additive, non-aqueous electrolyte and lithium ion battery

A non-aqueous electrolyte and additive technology, applied in the field of lithium-ion batteries, can solve the problems of easy fire and explosion of lithium-ion batteries, and achieve good battery cycle performance, reduce adverse reactions, and obvious flame-retardant effects

Active Publication Date: 2017-08-01
ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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  • Abstract
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  • Application Information

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Problems solved by technology

[0005] Therefore, judging from the current research progress, although lithium-ion batteries have the advantages of high energy density, high voltage, long life, no memory effect, no pollution, good flame retardancy and high safety, the main problem is that Lithium-ion batteries are prone to fire, explosion and other safety issues under abuse conditions, such as high temperature, overcharge, needle penetration and extrusion. Stable additives and non-aqueous electrolytes under overcharge, needle penetration, and extrusion

Method used

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  • Additive, non-aqueous electrolyte and lithium ion battery
  • Additive, non-aqueous electrolyte and lithium ion battery
  • Additive, non-aqueous electrolyte and lithium ion battery

Examples

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Embodiment 1

[0042] According to the following steps to configure the non-aqueous electrolyte, in an argon-protected glove box, trithiophene ethyl phosphate (TPEP, structural formula such as Figure 13 ), ethylene carbonate (EC) and diethyl carbonate (DEC) according to the mass ratio of 0.10:4.95:4.95 after mixing evenly, add lithium hexafluorophosphate (LiPF 6 ), the molar concentration of lithium salt in the non-aqueous electrolytic solution is 1mol / L, which is the non-aqueous electrolytic solution of the present invention, marked as Example 1.

Embodiment 2

[0044] Follow the steps below to configure the non-aqueous electrolyte. In an argon-protected glove box, mix TPEP, EC and dimethyl carbonate (DMC) uniformly in a mass ratio of 1:4.5:4.5, and add lithium hexafluorophosphate (LiPF 6 ), the molar concentration of lithium salt in the non-aqueous electrolyte is 0.8mol / L, which is the non-aqueous electrolyte of the present invention, marked as Example 2.

Embodiment 3

[0046] Follow the steps below to configure the non-aqueous electrolyte. In an argon-protected glove box, mix TPEP, EC, DMC, and DEC in a mass ratio of 1:1:1:2, and add lithium hexafluorophosphate (LiPF 6 ), the molar concentration of lithium salt in the non-aqueous electrolyte is 1.5mol / L, which is the non-aqueous electrolyte of the present invention, marked as Example 3.

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Abstract

The invention belongs to the technical field of lithium ion batteries, and particularly relates to a non-aqueous electrolyte and a lithium ion battery. The invention provides an additive, the additive is a phosphate compound containing thienyl, and the phosphate compound containing thienyl has a structure shown as a formula I; the invention also discloses a non-aqueous electrolyte and a lithium ion battery; and according to the additive and the non-aqueous electrolyte provided by the invention, the technical defects that the lithium ion battery is easy to break out a fire and explode under the conditions, such as high temperature, overcharging, acupuncture penetration and extrusion, of the lithium ion battery can be solved.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, in particular to nonaqueous electrolytic solutions and lithium ion batteries. Background technique [0002] Lithium-ion batteries are widely used in portable electronic product markets such as mobile phones, digital cameras, and personal computers due to their high energy density, high voltage, long life, no memory effect, and no pollution. However, in recent years, incidents of lithium-ion battery explosions and injuries are common, which has aroused widespread concern about the safety of lithium-ion batteries. [0003] At present, most commercial lithium-ion batteries use organic solvents as electrolytes, which have high vapor pressure and low flash point. Under some abuse conditions, such as high temperature, overcharge, needle penetration and extrusion, etc. It is easy to cause safety problems such as fire and explosion. [0004] The safety issues caused by organic electrolyte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0525H01M10/42
CPCH01M10/0525H01M10/0567H01M10/4235H01M2300/0025Y02E60/10
Inventor 钟国彬王超黄建苏伟曾杰项宏发
Owner ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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