Lithium-ion battery electrolyte and lithium-ion battery
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A lithium-ion battery and electrolyte technology, applied in the field of lithium-ion battery electrolyte and lithium-ion batteries, can solve problems such as performance deterioration, achieve the effects of ensuring safety, improving overcharge resistance, and ensuring battery safety
Active Publication Date: 2018-05-18
SUNWODA ELECTRIC VEHICLE BATTERY CO LTD
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The lower oxidation potential shows that this type of additive is only suitable for low-potential batteries, and it will cause deterioration of the performance of batteries in normal applications when used in high-potential batteries.
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Embodiment 1
[0059] Electrolyte preparation
[0060] Mix ethylene carbonate (EC), propylene carbonate (PC), and dimethyl carbonate (DMC) at a volume ratio of 1:1:1 as a solvent, and dissolve 1mol of LiPF in 1L of the mixed solvent 6 Lithium salt, and add mass ratio 2% VC (vinylene carbonate), 1% VEC (vinyl ethylene carbonate), 2% FEC (fluoroethylene carbonate), 0.5% p-fluorobenzonitrile As an additive, an electrolytic solution for a lithium ion secondary battery is formed. The structure of p-fluorobenzonitrile is shown in the figure below:
[0061]
[0062] The rest are the same as those of Comparative Example 1, and will not be repeated here.
Embodiment 2
[0064] Electrolyte preparation
[0065] Mix ethylene carbonate (EC), propylene carbonate (PC), and dimethyl carbonate (DMC) at a volume ratio of 1:1:1 as a solvent, and dissolve 1mol of LiPF in 1L of the mixed solvent 6 Lithium salt, and add 2% VC, 1% VEC, 2% FEC, 3% p-fluorobenzonitrile as additives by mass ratio to form electrolyte solution for lithium ion secondary battery.
[0066] The rest are the same as those of Comparative Example 1, and will not be repeated here.
Embodiment 3
[0068] Electrolyte preparation
[0069] Mix ethylene carbonate (EC), propylene carbonate (PC), and dimethyl carbonate (DMC) at a volume ratio of 1:1:1 as a solvent, and dissolve 1mol of LiPF in 1L of the mixed solvent 6 Lithium salt, and add 2% VC, 1% VEC, 2% FEC, 6% p-fluorobenzonitrile as additives by mass ratio to form electrolyte solution for lithium ion secondary battery.
[0070] The rest are the same as those of Comparative Example 1, and will not be repeated here.
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Abstract
The invention provides a lithium-ion battery and electrolyte thereof. By adding a cyano anti-overcharge additive to the electrolyte, anti-overcharge capacity of the lithium-ion battery is improved, and safety of the lithium-ion battery is guaranteed. The cyano anti-overcharge additive has acting level of about 5.25 V. When the lithium-ion battery experiences overcharge and level rises over 5.25 V,the cyano anti-overcharge additive polymerizes and produces massive hydrogen, the hydrogen increases inner pressure of the lithium-ion battery, safety devices such as an anti-explosion device are broken through, gas and heat are released, and battery safety is guaranteed accordingly. In addition, cyano group in the anti-overcharge additive can well adsorbs on the surface of cathodic material transition metal ions, changes in cathode level are quickly sensed, responding occurs quickly, no delay or untimely response occurs, and battery safety is guaranteed.
Description
technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a lithium ion battery electrolyte and a lithium ion battery. Background technique [0002] In order to meet the increasing power consumption of consumer electronics and the demand for electric vehicle cruising range, lithium-ion batteries provide two solutions, one is higher energy density, and the other is faster charging rate. Higher energy density means the ultimate application of space and materials, compression of design and manufacturing margins; faster charging rate means higher charging current, higher ohmic heat dissipation and faster response requirements. It can be seen that both solutions have compressed the margin of battery safety performance, especially the faster charging rate puts forward higher requirements for the battery's anti-overcharge performance. [0003] At present, the anti-overcharge protection of lithium-ion batteries mainly has two methods...
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