A lithium ion battery electrolyte and a lithium ion battery

A lithium-ion battery and electrolyte technology, which is applied to secondary batteries, circuits, electrical components, etc., can solve the problems of reducing the high-temperature cycle performance and rate performance of lithium-ion batteries, poor cycle stability, and rupture of electrode surface films, etc., to improve High-temperature cycle performance and rate performance, strong oxidation resistance, and the effect of reducing impedance

Active Publication Date: 2019-01-15
ZHANJIANG JUXIN NEW ENERGY
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  • Summary
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  • Application Information

AI Technical Summary

Problems solved by technology

The theoretical specific capacity of silicon anode material is 3572mAh/g, which has the advantages of high specific capacity, low working voltage and abundant reserves, etc. However, there is a crystal phase transition of silicon in the process of lithium deintercalation and accompanied by drastic volume change (greater than 300%) , leading to particle crushing and poor cycle stability, it is often used in combination with carbon
The stability of silicon-

Method used

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  • A lithium ion battery electrolyte and a lithium ion battery
  • A lithium ion battery electrolyte and a lithium ion battery
  • A lithium ion battery electrolyte and a lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0053] Example 1

[0054] (1) Positive electrode preparation: The high-voltage positive electrode active material NCA (NiCoAl ternary material LiNi 0.8 Co 0.1 Mn 0.1 O 2 , Purchased from BTR), CNTs (carbon nanotubes) and PVDF (polyvinylidene fluoride) according to a mass ratio of 97.8:1.0:1.2 mixed uniformly, and then dispersed in N-methyl-2-pyrrolidone to obtain positive electrode slurry; The positive electrode slurry is evenly coated on both sides of the aluminum foil, and the positive electrode sheet is obtained after rolling and slitting. Finally, it is baked and vacuum dried before being used.

[0055] (2) Preparation of the negative electrode: the silicon carbon BTR-S450 negative electrode material (purchased from BTR), acetylene black, CMC (carboxymethyl cellulose), SBR (styrene butadiene rubber) and binder according to the mass ratio of 95.8:0.5:1.4 :1.8:0.5 mixed uniformly, and then dispersed in deionized water to obtain negative electrode slurry; the negative electrode sl...

Example Embodiment

[0058] Example 2

[0059] The preparation method of the lithium ion battery is the same as in Example 1, the difference is that the non-aqueous organic solvent in step (3) is ethylene carbonate, dimethyl carbonate and ethyl methyl carbonate are uniformly mixed in a mass ratio of 2:4:1 The added amount of the latter mixed solution is 75% of the total mass of the electrolyte; the lithium salt is a mixture of lithium hexafluorophosphate and lithium difluorooxalate borate, and the added amount is 12.45% of the total mass of the electrolyte; the composition and the added amount of additives account for the electrolyte The percentage of total mass (wt%) is shown in Table 1 below.

[0060] Table 1 Ingredients and amounts added in each embodiment and comparative example

[0061]

[0062]

Example Embodiment

[0063] Example 3

[0064] The preparation method of the lithium ion battery is the same as that of Example 1, except that the non-aqueous organic solvent in step (3) is ethylene carbonate, propylene carbonate, and butylene carbonate after being uniformly mixed in a mass ratio of 2:4:1 The added amount of the mixed solution is 76.07% of the total mass of the electrolyte; the lithium salt is a mixture of lithium hexafluorophosphate and lithium difluorooxalate borate, and the added amount is 8% of the total mass of the electrolyte; the composition and addition amount of additives account for the total electrolyte The percentage of mass is shown in Table 1.

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Abstract

A lithium ion battery electrolyte comprise a non-aqueous organic solvent, a lithium salt and an additive, wherein that additive comprises dicyclohexylcarbodiimide, amino compound and isocyanate compounds. In the technical scheme provided by the invention, the additive of the electrolyte of the lithium ion battery comprises dicyclohexyl carbodiimide, amino compounds and isocyanates, wherein dicyclohexyl carbodiimide assists amino compounds and isocyanate compounds to participate in film formation, By forming a chain or network polymer film on the surface of the positive and negative electrodesof the lithium ion battery which is insoluble in the electrolyte and has strong oxidation resistance and good toughness, the impedance of the battery is reduced, and the high-temperature cycling performance and the rate performance of the lithium ion battery are improved.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a lithium ion battery electrolyte and a lithium ion battery. Background technique [0002] With the development of society and the advancement of science and technology, people have higher and higher requirements for the capacity per unit volume of lithium-ion batteries. A series of new high-capacity positive electrode materials such as modified lithium cobaltate, high-nickel ternary, and lithium-rich manganese have emerged. Health, high specific capacity is also accompanied by high battery operating voltage, the battery operating voltage ≥ 4.35V, even as high as 4.8V. However, for the conventional decorative film additives VC (vinylene carbonate) and PS (1,3-propane sultone), the film formation is unstable under the condition of ≥4.35V high voltage, and the SEI film (solid electrolyte Interface, SEI film, is a passivation layer covering the surface of the electrod...

Claims

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Application Information

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IPC IPC(8): H01M10/0525H01M10/0567
CPCH01M10/0525H01M10/0567Y02E60/10
Inventor 刘强杨攀谢青松杨文峰黄贵祥高学友
Owner ZHANJIANG JUXIN NEW ENERGY
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