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Combustion-resisting electrolyte of lithium secondary cell and its lithium cell

A lithium secondary battery and electrolyte technology, applied in the field of electrochemical and chemical power supply products, can solve the problems of high freezing point, great impact on battery performance, low lithium salt solubility, etc., and achieve the effect of excellent flame retardant performance

Inactive Publication Date: 2007-11-28
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of these phosphates have high viscosity, high freezing point, low lithium salt solubility, low phosphorus content, and cannot be used alone as a solvent, even if the amount used as an additive is limited
When the amount of such additives is too much, it will have a great impact on battery performance and has greater toxicity

Method used

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  • Combustion-resisting electrolyte of lithium secondary cell and its lithium cell
  • Combustion-resisting electrolyte of lithium secondary cell and its lithium cell
  • Combustion-resisting electrolyte of lithium secondary cell and its lithium cell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Lithium bisoxalate borate (LiBOB) and 10% VC were added to dimethyl methyl phosphate (DMMP) to form a 0.6M LiBOB+DMMP solution. Inject the electrolyte into graphite / LiCoO 2 Charge and discharge experiments were carried out in the battery (as shown in Figure 2). It can be seen from the figure that the efficiency in the first week can reach 86%, which is close to the initial efficiency of the traditional carbonate electrolyte, and the cycle performance is good.

Embodiment 2

[0036] At 1M LiPF 6 / EC-DMC (1:1) solution was added with 20% diethyl ethyl phosphate. The electrolyte solution is added into a commercial LiMn2O4-C lithium ion battery. It can be seen from Figure 3 that, except for a slight decrease in the charge-discharge efficiency of the battery in the first week (~84%), the charge-discharge efficiency of the battery subsequently rises rapidly to ~100%, and the charge-discharge voltage platform is exactly the same as that without the flame retardant. It shows that this flame retardant can also be used as a safety additive in practical batteries.

Embodiment 3

[0037] Example 3: Lithium hexafluorophosphate (LiPF 6 ) into 0.6M Li LiPF 6 +DMMP+DEMP solution. Inject the electrolyte into commercial graphite / LiCoO 2 In batteries, the prepared commercial graphite / LiCoO 2 Initial efficiency was -84%.

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Abstract

The invention discloses a flame-proof electrolyte and its lithium battery for secondary lithium battery, which is characterized by the following: adopting one or more phosphosubester (such as methyl acid phosphate dimethyl ester, ethyl phosphate diethyl ester and its derivant) as pure solvent or solvent component; reducing the price of electrolyte with incombustibility, low toxicity and high conductivity; improving the combusting safety effectively.

Description

technical field [0001] The invention relates to a flame-retardant electrolyte solution for a lithium secondary battery. It specifically relates to an electrolytic solution using one or more than one phosphoric acid (sub)ester as a pure solvent or a solvent component, and belongs to the technical field of electrochemical and chemical power supply products. Background technique [0002] With the rapid development of information technology and the increasing popularity of portable electronic devices, the demand for high specific energy batteries is increasing year by year. Lithium-ion batteries have significant advantages such as high voltage, low self-discharge rate, and high energy density, and are gradually replacing traditional batteries and expanding their application fields and market share. [0003] However, the potential safety hazards of lithium-ion batteries have always been the primary concern of applications. At present, the electrolyte used in lithium batteries i...

Claims

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Application Information

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IPC IPC(8): H01M10/40H01M10/056H01M10/0569
CPCY02E60/122Y02E60/10
Inventor 杨汉西冯金奎曹余良艾新平
Owner WUHAN UNIV
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