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Non-aqueous electrolyte and lithium ion battery containing same

A non-aqueous electrolyte and electrolyte technology, applied in the field of lithium-ion batteries, can solve the problems of poor kinetic performance and large impedance of batteries, and achieve the effects of improving thermal shock performance, inhibiting dissolution, and improving cycle performance

Active Publication Date: 2020-03-27
HUIZHOU LIWINON NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, adding a thermally stable film-forming additive to the electrolyte is one of the important methods to improve the thermal shock performance of lithium-ion batteries. However, the existing overcharge additives or flame-retardant additives are all due to excessive impedance and lead to poor kinetic performance of the battery. become worse and limit its wide use

Method used

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  • Non-aqueous electrolyte and lithium ion battery containing same
  • Non-aqueous electrolyte and lithium ion battery containing same
  • Non-aqueous electrolyte and lithium ion battery containing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Electrolyte preparation: In a glove box filled with argon, mix ethylene carbonate, ethyl methyl carbonate and diethyl carbonate according to the mass ratio of EC:EMC:DEC=1:1:1, and then add to the mixed solution Slowly add 12.5wt% lithium hexafluorophosphate (LiPF 6 ), 0.5wt% lithium difluorooxalate borate (LiODFB) based on the total weight of the electrolyte and 1.25wt% lithium bisfluorosulfonyl imide (LiTFSI) based on the total weight of the electrolyte, and finally add 1.0wt based on the total weight of the electrolyte % have the structure compound A shown in formula I, 1.0wt% have the structure compound B of formula II, 5wt% fluoroethylene carbonate (FEC) and 0.5wt% vinylene carbonate (VC), obtain the embodiment after stirring uniformly 1 non-aqueous electrolyte for lithium-ion batteries.

[0034] Preparation of soft pack battery: the positive electrode sheet (active material LiCoO 2 ), diaphragm, and negative electrode sheet (active material graphite) are stacked...

Embodiment 2-19

[0035] Embodiment 2-19 and comparative example 1-9

[0036] In Examples 2-19 and Comparative Examples 1-9, except that the composition ratio of the components of the electrolyte is in accordance with the additives shown in Table 1, the others are the same as in Example 1. In addition, the description of the structural formulas of the additives of formula I and additives of formula II in each embodiment is shown in Table 2.

[0037] Table 1 embodiment 1-19 and the composition ratio of each component of the electrolyte of comparative example 1-9

[0038]

[0039]

[0040]

[0041] Structural formula Ⅰ and structural formula Ⅱ specific material description in the embodiment of table 2

[0042]

[0043]

[0044] Performance Testing

[0045] Relevant performance tests were performed on the batteries and their electrolytes prepared in Examples 1-19 and Comparative Examples 1-9.

[0046] (1) Cycling performance test at room temperature: At 25°C, charge the divided b...

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Abstract

The invention belongs to the technical field of lithium ion batteries, particularly to a non-aqueous electrolyte and a lithium ion battery containing the same. The non-aqueous electrolyte comprises alithium salt, a non-aqueous organic solvent and additives, and the additives comprise a compound additive A having a structure represented by a formula I, a compound additive B having a structure represented by a formula II, and a film forming additive. Compared with the prior art, the non-aqueous electrolyte for the lithium ion battery, through the synergistic effect of the compound additive A, the compound additive B, the film-forming additive and a lithium salt additive, has excellent film-forming performance on the surface of the electrode, effectively improves the thermal shock performance of the lithium ion battery, has good cycle performance, can effectively improve the high-temperature storage performance, and gives consideration to the dynamic performance of the lithium ion battery.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a nonaqueous electrolytic solution and a lithium ion battery containing the electrolytic solution. Background technique [0002] Due to its high energy density and stable cycle performance, lithium-ion batteries have achieved great success in their current applications, especially in mobile electronic products. However, it cannot be ignored that since the large-scale commercialization of lithium-ion batteries, safety accidents related to them have hardly stopped. The safety of lithium-ion batteries has become a key factor restricting its further development, which has attracted widespread attention of scientific researchers. The battery needs to ensure the safety of users under high temperature conditions and overcharging. Thermal shock performance is an important indicator for most companies to test the safety of lithium-ion batteries. Therefore, it is...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0568H01M10/0569H01M10/0525
CPCH01M10/0567H01M10/0568H01M10/0569H01M10/0525H01M2300/0025Y02E60/10
Inventor 张丽娟杨山陈杰李载波
Owner HUIZHOU LIWINON NEW ENERGY TECH CO LTD
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