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Novel sulfate solvent for lithium ion secondary battery

A secondary battery and sulfuric acid ester technology, which is applied in the field of electrochemical and chemical power supply products, can solve the problems of poor compatibility, insufficient compatibility of positive or negative electrodes, insufficient compatibility of graphite negative electrodes, etc., and achieve the effect of small cycle

Inactive Publication Date: 2013-10-02
STATE GRID CORP OF CHINA +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This new type of liquid that contains certain chemicals can be used with Lithium-ion batteries at low temperatures without losing their effectiveness or causing damage during storage.

Problems solved by technology

This patents discuss various technical problem addressed in this patented text that highlighted during research into novel solutions for improving the performances of Li-ions batteries due to better electrical safety, reduced volumetric expansion rates, increased durability against corrosion reactions, enhanced mechanical strength, lower resistances at interfaces between different types of metal components like iron/chroman composite particles, silane coatings, alkyl tin plasma resins, hydrogen permeabilites, ammonia soluble bases, ethylenegelemaide solute carriers, tetraethylethanesulfonamides, dimethyl sulfonimides, boraxolines, pyridinoline salts, imidazole derivatives, quaternary salt solvent mixtures, acid acceptors, aliphatic carboxillic acid esters, saturated Lewis base solvent compositions containing chloroform-, bicycleoxymene-, pivalliposome solution, polyvinyl alcohol, polyanhydride, aluminum hydrides, sodium dialklimbs, cyclodescopesistants, guafluorescent agents, triphenols, hexaphthaquinones, vanadiums, selenium solvency liquid crystals, and unsatisfactory compatibilieties among many possible combinations.

Method used

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  • Novel sulfate solvent for lithium ion secondary battery
  • Novel sulfate solvent for lithium ion secondary battery
  • Novel sulfate solvent for lithium ion secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] In a glove box full of argon gas, the sulfuric acid ester solvent of the present invention is used to prepare an electrolyte, the lithium salt used is LiTFSI, the concentration of LiTFSI in the electrolyte is 1M, and the sulfuric acid ester compound used is disulfuric acid Butyl ester, the specific structure is as follows:

[0017]

[0018] The dibutyl sulfate has a low melting point, as attached figure 2 As shown, it is about -41°C, which can broaden the selection of solvents for the low-temperature electrolyte system of lithium-ion batteries.

Embodiment 2

[0020] MCMB / Li 2016 button cells were assembled in a glove box filled with argon gas, using the electrolyte prepared from the new solvent described in Example 1, the charge and discharge voltage range was 0-3 V, and the current density was 40 mA / g. The test results are attached by image 3 It can be seen that for the MCMB negative electrode, the charging specific capacity in the first week is 349 mAh / g (coulombic efficiency is 75% in the first week), the charging specific capacity after 100 cycles is 332 mAh / g, and the capacity retention rate is 95%. The electrolyte prepared by the solvent has similar properties to the blank electrolyte of Comparative Example 1, indicating that the electrolyte using the new solvent has good compatibility with the negative electrode.

Embodiment 3

[0022] Assembling LiFePO in an argon-filled glove box 4 / Li 2016 button battery, using the electrolyte solution prepared by the new solvent described in Example 1, the charge and discharge voltage range is 3-4V, and the current density is 40 mA / g. The test results are attached by image 3 Visible, for LiFePO 4 The positive electrode has a discharge specific capacity of 134 mAh / g in the first week (the Coulombic efficiency of the first week is 88%), and after 100 cycles, the discharge specific capacity is 132 mAh / g, and the capacity has basically no attenuation, indicating that the electrolyte prepared by using the new solvent to LiFePO 4 The performance of the positive electrode is not greatly affected.

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Abstract

The invention discloses a novel solvent which can be used for an electrolyte of a lithium secondary cell. The solvent is structurally characterized by being a sulfate compound and a derivative thereof, and the condensed structural formula is R1OSO2OR2, wherein R1 and R2 can be symmetric or asymmetric; R1 or R2 is an alkyl (but not virulent dimethyl sulfate), an ether chain, an aryl group, a halogenated alkyl group, a halogenated ether or a halogenated aryl group; the halogen is F, Cl or Br; the halogenation is partial or complete substitution. By using and containing the solvent, the high-temperature and low-temperature range of the electrolyte can be widened, and more choices can be provided for the solvent for a lithium ion battery; and the performance of a lithium ion battery, such as specific capacity, circularity and the like, can be affected less.

Description

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Claims

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Application Information

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Owner STATE GRID CORP OF CHINA
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