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Lithium-ion battery electrolyte and lithium-ion battery containing same

A lithium-ion battery and electrolyte technology, applied in the field of lithium-ion batteries, can solve problems such as poor safety performance of electrolyte, and achieve the effects of improving safety performance and suppressing gas generation

Active Publication Date: 2010-02-03
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a new type of electrolyte that can improve the safety of lithium ion batteries (including overcharge safety performance, high temperature performance and flame retardancy) in order to overcome the defects of poor electrolyte safety performance of existing lithium ion batteries

Method used

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  • Lithium-ion battery electrolyte and lithium-ion battery containing same
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Examples

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Embodiment 1

[0037] This embodiment is used to illustrate the lithium ion battery electrolyte provided by the present invention and the lithium ion battery thereof.

[0038] (1) Preparation of electrolyte

[0039] Prepare the mass ratio of organic solvent ethylene carbonate (EC): divinyl carbonate (DEC): gamma-butyrolactone (GBL)=2: 2: 1 combined solvent 87.5g, add the LiPF of 12.5g wherein 6 , to prepare bulk electrolyte, then add 1.5gVC, 3gF-EC, 3.5gPS to it and mix evenly, add molecular sieve to remove water, and let stand for 1 day. Pour out the electrolyte solution after water removal to obtain the experimental electrolyte solution.

[0040] In the non-aqueous electrolyte, the VC in the mixed additive accounts for 1.5% by mass of the electrolyte, the F-EC is 3%, and the PS is 3.5%.

[0041] (2) Preparation of positive electrode

[0042] 8.7 kg of N-methylpyrrolidone (NMP), 1 kg of acetylene black and 0.3 kg of polyvinylidene fluoride (PVDF) powder were mixed and stirred for 5 minut...

Embodiment 2

[0050] This embodiment is used to illustrate the lithium ion battery electrolyte provided by the present invention and the lithium ion battery thereof.

[0051] Lithium-ion batteries were prepared according to the method of Example 1, wherein the difference was that the quality of the mixed additives added in the preparation of the electrolyte was different, including 2gVC, 7gF-EC, and 4gPS.

[0052] In the non-aqueous electrolyte, the mass percent of VC in the mixed additives in the electrolyte is 2%, F-EC is 7%, and PS is 4%.

[0053] Finally made LP043450A lithium ion battery A2.

Embodiment 3

[0055] This embodiment is used to illustrate the lithium ion battery electrolyte provided by the present invention and the lithium ion battery thereof.

[0056] Lithium-ion batteries were prepared according to the method of Example 1, wherein the difference was that the quality of the mixed additives added in the preparation of the electrolyte was different, including 0.3gVC, 1.5gF-EC, and 1.2gPS.

[0057] In the non-aqueous electrolyte, the VC in the mixed additive accounts for 0.3% by mass of the electrolyte, the F-EC is 1.5%, and the PS is 1.2%.

[0058] The finally made LP053450A lithium ion battery A3.

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Abstract

The invention provides lithium-ion battery electrolyte and a lithium-ion battery containing the same. The electrolyte comprises solvent, electrolyte lithium salt and a mixture additive which comprisesa compound A, a compound B and a compound C, wherein R1 in the compound A is straight-chain paraffin of CnH2n+1, and n is more than or equal to 0 and less than or equal to 3; X in the compound B is selected from one of F and Cl; R2 is the straight-chain paraffin of the CnH2n+1, and n is more than or equal to 0 and less than or equal to 3; R3 is straight-chain paraffin of -CnH2n and n is more thanor equal to 1 and less than or equal to 4; R4 is straight-chain paraffin of -CnH2n+1-a Ya, and n is more than or equal to 1 and less than or equal to 4; R5 is -CnH(2n+1-b)Zb, and n is more than or equal to 0 and less than or equal to 3; Y and Z are selected from one of F and Cl; a and b are more than or equal to 0 but are not 0 simultaneously; and the compound C is selected from at least one of glycol sulfite, 1,3-propane sultone and trimethylene sulfite. The electrolyte can greatly improve the safety performance of the lithium-ion battery.

Description

technical field [0001] The invention relates to a lithium ion battery electrolyte and a lithium ion battery using the electrolyte. Background technique [0002] In 1995, Sony Corporation of Japan successfully developed two lithium-ion batteries for electric vehicles, one is a high-energy lithium battery for BEV (cylindrical single battery with a capacity of 100Ah, 8 in series to form a battery module), The other is a high-power lithium battery for HEV (capacity is 22Ah, 8 batteries are connected in series to form a battery module, and the output power is 217 times that of the former). And China Tianjin Power Supply Research Institute (the 18th Research Institute of Electronics of the Ministry of Information Industry), etc. have also been engaged in the research and development of lithium-ion power batteries. Its goal is to develop practical batteries for electric vehicles, aerospace, military communications and energy storage. [0003] Lithium-ion batteries have outstandin...

Claims

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Application Information

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IPC IPC(8): H01M10/40
CPCH01M2300/0034H01M10/0567H01M10/0568Y02E60/122H01M2300/0025H01M10/0569H01M10/052H01M2300/0031Y02E60/10Y10T29/4911
Inventor 周贵树司雷王涌范艺韡
Owner BYD CO LTD
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