Lithium ion battery electrolyte and lithium ion secondary battery

A lithium-ion battery and electrolyte technology, applied in the field of lithium-ion battery electrolyte, lithium-ion secondary battery, and lithium-ion battery electrolyte, can solve the problems of insufficient cycle performance and low-temperature discharge performance, and achieve the effect of improving cycle performance

Inactive Publication Date: 2012-03-28
TIANJIN LISHEN BATTERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The present invention aims at the problems of insufficient cycle performance and low-temperature discharge performance in lithium-ion secondary batteries, and provides a functional lithium-io

Method used

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  • Lithium ion battery electrolyte and lithium ion secondary battery
  • Lithium ion battery electrolyte and lithium ion secondary battery
  • Lithium ion battery electrolyte and lithium ion secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0030] Example 1

[0031] This Example 1 is used to illustrate that the SEI film formed by the lithium ion battery electrolyte additive provided by the present invention has a low impedance.

[0032] Mix EC, EMC and DEC uniformly in a volume ratio of 1:1:1, and slowly add lithium salt LiPF 6 A non-aqueous organic electrolyte solution with a concentration of 1M was prepared to prepare electrolyte solution 1. Tris(trimethylsilane) phosphate TMSP was added to electrolyte solution 1 in an amount of 2wt% of the total weight of the electrolyte solution to prepare electrolyte solution 2.

[0033] A button-type half-cell was fabricated by using a negative electrode sheet with lithium sheet and artificial graphite as active materials as two electrodes, a porous polyolefin compound separator as a separator, and prepared electrolyte 1 and electrolyte 2 as electrolytes.

[0034] Cyclic voltammetry (CV) test at 0.5mV / S speed, see the test results figure 1 , it can be clearly seen that TM...

Example Embodiment

[0036] Example 2

[0037] Mix EC, EMC, and DEC uniformly in a volume ratio of 3:4:3, and slowly add lithium salt LiPF 6 A non-aqueous organic electrolyte solution with a concentration of 1M is prepared, and tris(trimethylsilane) phosphate is added to the prepared electrolyte solution according to the proportions of 0.5wt%, 1wt% and 5wt% of the total weight of the electrolyte solution to obtain Electrolyte 3, Electrolyte 4, Electrolyte 5.

Example Embodiment

[0038] Example 3

[0039] Mix EC and DEC uniformly in a volume ratio of 3:7, and slowly add lithium salt LiPF 6Prepare a non-aqueous organic electrolyte with a concentration of 1M, and add tris(triphenylsilane) phosphate and 2wt% to the prepared electrolyte according to the proportions of 1wt%, 10wt%, and 15wt% of the total weight of the electrolyte. The fluoroethylene carbonate FEC obtained electrolyte 6, electrolyte 7, and electrolyte 8.

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Abstract

The invention belongs to the technical field of battery, and discloses a lithium ion battery electrolyte and a lithium ion secondary battery. The lithium ion battery electrolyte contains electrolyte salts, a non-aqueous organic solvent, and an additive; the additive comprises a silane phosphate ester additive which accounts for 0.01%-20% of the total weight of the lithium ion battery electrolyte. the lithium ion secondary battery comprises the lithium ion battery electrolyte. By adding the silane phosphate ester additive into the lithium ion battery electrolyte, the invention obviously increases the cycle performance and low temperature discharge performance of the lithium ion battery.

Description

technical field [0001] The invention relates to a lithium-ion battery electrolyte and a lithium-ion secondary battery, in particular to a lithium-ion battery electrolyte capable of improving the cycle performance and low-temperature discharge performance of a lithium-ion battery and a lithium-ion secondary battery made of the electrolyte . Background technique [0002] In recent years, due to the pressure of environmental pollution and energy shortage, countries are forced to find new green, environmentally friendly and sustainable energy sources. Lithium-ion batteries that appeared in the 1990s are widely used as portable power sources due to their high voltage, high specific energy, long cycle life, stable discharge performance, and environmental protection. With the expansion of the application field of lithium-ion batteries, the requirements for battery performance are also increasing. In some special occasions, such as military, aerospace, aviation, etc., the performan...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0525
CPCY02E60/122Y02E60/10
Inventor 孔令丽苏志江高俊奎孙杰
Owner TIANJIN LISHEN BATTERY
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