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High function type eletrolysis solution used for lithium ionic cell

A lithium-ion battery and electrolyte technology, applied in secondary batteries, circuits, electrical components, etc., can solve the problems of poor low-temperature performance, insufficient stability of the SEI film on the surface of the negative electrode, low solubility and conductivity, etc., to improve conductivity, Excellent electrochemical stability and improved solubility

Inactive Publication Date: 2009-05-06
SHANDONG HIRONG POWER SUPPLY MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to find an organic solvent formula suitable for LiBOB salt, thereby solving the problems of low solubility and electrical conductivity of LiBOB in existing organic solvents, poor low-temperature performance, and insufficient stability of the SEI film on the surface of the negative electrode.

Method used

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  • High function type eletrolysis solution used for lithium ionic cell
  • High function type eletrolysis solution used for lithium ionic cell
  • High function type eletrolysis solution used for lithium ionic cell

Examples

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Effect test

Embodiment 1

[0021] In a glove box filled with argon gas, weigh 38% GBL, 38% EA, 19% EC and 5% VC by weight. After mixing well, slowly add 0.7mol / L electrolyte salt. LiBOB, stir until the lithium salt is completely dissolved, and then the high-functional electrolyte of the present invention can be obtained, and the ratio is 5wt.% VC+0.7mol / LLiBOB-GBL:EA:EC (1:1:0.5, wt).

[0022] At room temperature (20°C), the conductivity of the electrolyte in Test Example 1 was 9.05 mS·cm -1 .

[0023] The electrochemical stability test result of embodiment 1 electrolyte is as follows figure 1 shown. figure 1 The medium current density is relatively small, and the electrolyte can be considered to be relatively stable. When the current density reaches 0.1mA / cm -2 , it can be considered that the electrolyte begins to decompose. The electrochemical window of the high-functional electrolyte is 0.4-5V. After the first scan, figure 1 S1 and S2 are roughly equal, and the reaction is reversible.

[0024...

Embodiment 2

[0027] In a glove box filled with argon gas, weigh 38% GBL, 38% EA, 19% EC and 5% ES respectively by weight. After mixing well, slowly add 0.7mol / L electrolyte salt. LiBOB, stir until the lithium salt is completely dissolved, and then the high-performance electrolyte of the present invention can be obtained, and the ratio is 5wt.% ES+0.7mol / LLiBOB-GBL:EA:EC (1:1:0.5, wt).

[0028] At room temperature (20°C), the conductivity of the electrolyte in Example 2 is 8.96 mS·cm -1 .

[0029] The electrochemical stability test result of embodiment 2 electrolyte is as follows Figure 4 shown. Figure 4 The current density in is relatively small, and it can be considered that the electrolyte is relatively stable. When the current density reaches 0.1mA / cm -2 , it can be considered that the electrolyte begins to decompose. The electrochemical window of the high-functional electrolyte is 0.5-5V. After the first scan, Figure 5 S1 and S2 are roughly equal, and the reaction is reversib...

Embodiment 3

[0033]In an argon-filled glove box, weigh 48% GBL, 38% EA, 10% EC, 2% ES, and 2% VC by weight. After mixing well, slowly add 1.0 mol / L electrolyte salt LiBOB is stirred until the lithium salt is completely dissolved, and then the high-performance electrolyte of the present invention can be obtained.

[0034] At room temperature (20°C), the electrical conductivity of the quinary electrolyte of Example 3 obtained by testing was 8.71 mS·cm -1 .

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Abstract

The invention relates to a high-performance electrolyte formula used for a lithium ion battery, which belongs to the technical field of the electrolyte of the lithium ion battery. The formula is characterized in that novel lithium salt, namely lithium bis (oxalato) borate (LiBOB) is adopted as electrolyte salt, annular carboxylic ester gamma-butyrolactone (GBL), ethylene carbonate (EC), and one or two linear carboxylic esters as organic solvent, and one or two of film formation additives, vinylene carbonate (VC) and ethylene sulfite (ES) is (are) added. Compared with carbonic ester solvent, the multi-component solvent has the advantages that the solubility of LiBOB is greatly enhanced, the electric conductivity of the electrolyte is higher, the electrochemical stability is good, the bulk resistance is lower, and the requirement of the lithium ion battery can be satisfied. When the high-performance electrolyte is applied to an experimental half element, the high and low temperature cycle performance of the tested battery is good, and the specific discharge capacity is increased.

Description

technical field [0001] The invention belongs to the technical field of electrolytes for lithium ion batteries, and particularly relates to a high-function lithium ion battery electrolyte containing film-forming additives for novel lithium salt lithium bisoxalatoborate (LiBOB). Background technique [0002] At present, lithium-ion batteries have become one of the most promising systems among all chemical power sources due to their high operating voltage, small size, light weight, high specific energy, no memory effect, no pollution, low self-discharge, and long cycle life. one. The current commercial lithium-ion battery electrolyte formulations are all LiPF 6 / Ethylene carbonate (EC) + co-solvent, although this electrolyte has high conductivity and wide electrochemical stability window, due to LiPF 6 It is easy to react with the impurity water in the solvent to generate HF and corrode the electrode material, which will not only greatly reduce the cycle life of the battery, ...

Claims

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Application Information

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IPC IPC(8): H01M10/40H01M10/0569
CPCY02E60/122Y02E60/10
Inventor 仇卫华黄佳原于昭新康晓丽邢桃峰许婷婷
Owner SHANDONG HIRONG POWER SUPPLY MATERIAL
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