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Electrolyte functional additive, non-aqueous lithium ion battery electrolyte and lithium ion battery

A technology of lithium-ion batteries and functional additives, applied in the field of lithium-ion batteries, can solve the problems of battery capacity reduction, electrolyte consumption, lithium analysis, etc.

Inactive Publication Date: 2016-09-28
ZHUHAI SMOOTHWAY ELECTRONICS MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In a low-temperature environment, if the formed SEI film is too thick and the film resistance is high, lithium ions cannot migrate through, and lithium precipitation will occur; during high-temperature cycling, if the formed SEI film is not dense and stable, the SEI film will Gradually dissolve or rupture, causing the exposed negative electrode to continue to react with the electrolyte, which consumes the electrolyte and reduces the battery capacity

Method used

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  • Electrolyte functional additive, non-aqueous lithium ion battery electrolyte and lithium ion battery
  • Electrolyte functional additive, non-aqueous lithium ion battery electrolyte and lithium ion battery
  • Electrolyte functional additive, non-aqueous lithium ion battery electrolyte and lithium ion battery

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Embodiment 1

[0026] 1. Electrolyte preparation: The electrolyte is prepared in a BRAUN glove box filled with nitrogen gas with a purity of 99.999%, the moisture in the glove box is controlled at ≤5ppm, and the temperature is room temperature. Mix the solvent system with a mass ratio of EC:DMC:DEC=3:3:4 evenly, seal it, put it in the refrigerator until it cools down to 8°C, transfer it to the glove box, and then add LiPF in two batches 6 Mix well to form a non-aqueous electrolyte solution for a lithium-ion battery with a lithium salt molar concentration of 1 mol / L, and add CsC to the above non-aqueous electrolyte solution 5 h 5 NPF 6 Make it contain 0.01mol of CsC 5 h 5 NPF 6 The non-aqueous electrolyte solution is uniformly mixed to obtain the non-aqueous lithium-ion battery electrolyte solution.

[0027] 2. Preparation of lithium-ion battery positive electrode: Mix LCO material, conductive agent SuperP, and binder PVDF at a mass ratio of 96:2.0:2.0 to make a certain viscosity lithium...

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Abstract

The invention discloses a non-aqueous lithium ion electrolyte additive, electrolyte and a lithium ion battery. A chemical formula of the functional additive is AB, wherein A and B represent chemical formulas; the A is one or a mixture of more than one of Cs, Rb, Sr or Ba; the B is one or a mixture of more than one of C2O4<2->, CF3CO2<->, DCTA<->, TDI<->, PDI<->, BFMB<->, TCB<->, DMSI<->, HPSI<->, C(SO2CF3)<3->, FAB<->(BF3(CF2CF3)3<->), FAP<->(PF3(CF3)3<->) and DFOP<->(PF2(C2O4)2<->). By adding the functional additive, an electrolyte system can be prompted to form a dense and uniform SEI film with high lithium ion conductivity when being formed for the first time, and a lithium separation problem caused by serious polarization in a low-temperature charging-discharging process is alleviated.

Description

technical field [0001] The invention relates to a lithium ion battery, and more specifically, the invention relates to a functional additive for a nonaqueous lithium ion battery electrolyte, a nonaqueous lithium ion battery electrolyte and a lithium ion battery using the electrolyte. Background technique [0002] With the rapid development of increasingly smaller and lighter portable electronic devices, there is an increasing demand for small, lightweight, thin and high-performance batteries that provide power for these portable electronic devices. However, as the battery pursues small volume and high energy density, the compaction density of the positive and negative electrodes is continuously increased or the high-capacity negative electrode material with poor cycle performance is used, which also brings a series of performance problems of the battery, such as poor cycle performance. , Poor high temperature performance, poor low temperature performance and rate performance...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0525
CPCH01M10/0525H01M10/0567H01M2220/30Y02E60/10
Inventor 戴晓兵王霹霹
Owner ZHUHAI SMOOTHWAY ELECTRONICS MATERIALS