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Non-aqueous electrolyte and lithium secondary battery using the same

A non-aqueous electrolyte, supporting electrolyte technology, applied in non-aqueous electrolyte batteries, secondary batteries, secondary battery repair/maintenance, etc., can solve problems such as volatile

Inactive Publication Date: 2011-09-21
HITACHI LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These non-aqueous solvents are usually volatile and flammable

Method used

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  • Non-aqueous electrolyte and lithium secondary battery using the same
  • Non-aqueous electrolyte and lithium secondary battery using the same
  • Non-aqueous electrolyte and lithium secondary battery using the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Dissolve 0.8% by weight of vinylene carbonate (VC) in a mixed solution of ethylene carbonate (EC), fluoroethylene carbonate (FEC) and ethylmethyl carbonate (EMC) (volume ratio 0.9:0.1:2). ), 1mol / L LiPF 6 . Trimethyl phosphate (TMP) was added thereto so as to be 5% by weight to prepare an electrolytic solution.

[0052] The following combustion test was implemented about this electrolytic solution, and flame retardancy was evaluated.

[0053] (combustion test)

[0054] Infiltrate 2mL (milliliters) of various electrolytes into glass fibers (width 20×length 65mm), expose to the test flame in the atmosphere for 10 seconds, keep away from the test flame, observe the appearance of the flame by visual inspection, and measure until the flame is extinguished time. The case where the flame-out time was less than 10 seconds was regarded as flame retardancy, and the case where it was 10 seconds or more was regarded as flammability.

[0055] In addition, using the above-mentio...

Embodiment 2

[0075] Except having added trimethyl phosphate (TMP) so that it might become 10 weight%, and prepared an electrolytic solution, it carried out similarly to Example 1, prepared an electrolytic solution, and implemented a combustion test and a charge-discharge test.

[0076] The results are shown in Table 1.

Embodiment 3

[0078] Trimethyl phosphate (TMP) was added to make it 5% by weight, and tris(2,2,2-trifluoroethyl) phosphate (TFEP) was added to make it 5% by weight to prepare an electrolytic solution. An electrolytic solution was prepared in the same manner as in Example 1, and a combustion test and a charge-discharge test were carried out.

[0079] The results are shown in Table 1.

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Abstract

A non-aqueous electrolyte and a lithium secondary battery using the same are provided, which satisfy both flame retardancy and charge-discharge cycle characteristics, and attain a longer lifetime of the battery. A mixture of a chain carbonate, vinylene carbonate, a fluorinated cyclic carbonate and a phosphate ester is used as the non-aqueous electrolyte. It is desirable that the phosphate ester includes trimethyl phosphate and a fluorinated phosphate ester. Further, it is desirable that ethylene carbonate is further contained.

Description

technical field [0001] The present invention relates to a non-aqueous electrolytic solution and a lithium secondary battery using the same. Background technique [0002] In recent years, there has been an increasing demand for miniaturization and higher energy density for power supplies for mobile communications such as mobile phones and portable computers. In addition, late-night power storage power sources and power storage power sources combined with solar cells or wind power generation are also being developed. The practical use of electric vehicles, hybrid vehicles and hybrid trains using electric power as part of the power is also progressing. [0003] As the nonaqueous electrolyte, a nonaqueous electrolyte obtained by dissolving an electrolyte such as lithium hexafluorophosphate in a nonaqueous solvent such as ethylene carbonate is known. These non-aqueous solvents are usually volatile and flammable. [0004] In particular, it is desired to use a non-aqueous electr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/42H01M10/0568H01M10/0525
CPCY02E60/122H01M10/056H01M10/052Y02E60/10H01M10/0566
Inventor 小林稔幸河野一重
Owner HITACHI LTD
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