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Non-combustible secondary lithium battery

A secondary lithium battery and electrolyte technology, applied in secondary batteries, circuits, electrical components, etc., can solve the problems of limited improvement and difficult performance of graphite, and achieve high safety and improved safety performance

Inactive Publication Date: 2013-12-25
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Adding a film-forming agent can improve the interface properties between the electrode and the solution to a certain extent, thereby improving the compatibility between the electrolyte and graphite, but the degree of improvement is very limited, and the performance of graphite is still difficult to exert

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Example 1: A button battery composed of a phosphonate non-combustible electrolyte and a silicon-based negative electrode

[0028] Assemble SiO / Li, SiFe / Li, Si / Li button cells in a glove box filled with argon, using electrolyte prepared by phosphonate, using constant current charge and discharge mode, working voltage range is 0.01 ~ 1.5V, The current density is 100mA / g. see test results figure 2 , the results show that the SiO negative electrode exhibits good cycle stability in phosphonate non-combustible electrolytes, among which DMMP and TMP have high cycle stability, and the capacity retention rates after 100 cycles are 91.4% and 88.2%, respectively, very Close to the cycle performance in carbonate-based electrolytes. It shows that these non-combustible electrolytes have better electrochemical stability to SiO materials, and the phosphonate non-combustible electrolytes have a great possibility of application on SiO electrodes. After 100 cycles of cycling in DMMP a...

Embodiment 2

[0029] Example 2: A button battery composed of phosphonate non-combustible electrolyte and antimony-based negative electrode

[0030] The Sb / Li2016 button cell was assembled in a glove box filled with argon, using the electrolyte prepared by phosphonate, using the constant current charge and discharge mode, the working voltage range was 0.4-1.5V and the current density was 100mA / g. see test results image 3 , the results showed that Sb / C showed good electrochemical activity in several phosphonate non-combustible electrolytes, and the charging specific capacity in the first week was above 400mAh / g, especially in DMMP, DEEP and TEP non-combustible electrolytes. The solution showed high cycle stability, and the capacity retention rates after 100 weeks were 100.1%, 76.8% and 78.4%, respectively. This expands the application of phosphonate-based nonflammable electrolytes in alloy anodes.

Embodiment 3

[0031] Example 3: A button battery composed of phosphonate non-combustible electrolyte and tin-based negative electrode

[0032]Assemble Sn / Li2016 button cells in a glove box filled with argon, using the electrolyte prepared by dimethyl methylphosphonate (DMMP), using constant current charge and discharge mode, the working voltage range is 0.01 ~ 2V, the current density It is 100mA / g. The test results show that the discharge specific capacity of Sn-based material in DMMP electrolyte is 1305mAh / g in the first week, the coulombic efficiency is 61.6%, and the capacity retention rate after 100 cycles is 46.8%.

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Abstract

The invention discloses a non-combustible secondary lithium battery which comprises a positive electrode, a negative electrode and an electrolyte. The non-combustible secondary lithium battery is characterized in that the solvent of the electrolyte is phosphonic acid ester compounds, and the electrolyte comprises lithium salt. The negative electrode materials are silicon substrate alloy or tin base alloy or antimony alloy. The phosphonic acid ester compounds are used as the solvent of the electrolyte of the secondary lithium battery, a non-combustible battery system is prepared, and safety performance of the secondary lithium battery is improved. In addition, in order to overcome the defect that the compatibility between the phosphonic acid ester compounds and a graphite electrode is poor, the silicon substrate alloy or the tin base alloy or the antimony alloy or the like is adopted to replace original graphite to be used as the negative electrode materials of the battery, and the negative electrode materials have electrochemical performance similar to that of a conventional carbonic ester electrolyte. Due to the fact that the electrolyte is non-combustible, the secondary lithium battery with the non-combustible electrolyte has higher safety.

Description

technical field [0001] The invention belongs to the technical field of secondary lithium batteries, in particular to a secondary lithium battery containing non-flammable electrolyte. Background technique [0002] Due to the advantages of high working voltage, high specific capacity, light weight, low self-discharge rate, and low environmental pollution, lithium-ion batteries have been widely used. In recent years, especially in the fields of pure electric vehicles EV and hybrid electric vehicles HEV more attention. However, safety accidents of lithium-ion batteries occur frequently, and safety issues restrict its large-scale application. The main cause of the safety problem is that the conventional carbonate electrolyte is extremely flammable, and there are major safety hazards. Therefore, the development of completely non-combustible electrolytes is the fundamental way to eliminate electrolyte combustion. The key to the development of completely non-flammable electrolyte...

Claims

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Application Information

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IPC IPC(8): H01M10/0569H01M10/0567
CPCY02E60/10
Inventor 曹余良吴冰斌杨汉西艾新平曾子琪江晓宇
Owner WUHAN UNIV
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