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Non-aqueous electrolyte of high-voltage lithium ion batteries

A lithium-ion battery, non-aqueous electrolyte technology, applied in secondary batteries, circuits, electrical components, etc., can solve problems such as poor electrolyte cycle performance, improve normal temperature cycle performance, reduce side reactions, and improve conductivity. Effect

Active Publication Date: 2013-11-06
ZHUHAI SMOOTHWAY ELECTRONICS MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The main purpose of the present invention is to provide a non-aqueous electrolyte solution for high-voltage lithium-ion batteries to improve the interface performance and compatibility between the positive electrode and the electrolyte solution, thereby overcoming the problem of poor cycle performance of the electrolyte solution under high-voltage conditions

Method used

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  • Non-aqueous electrolyte of high-voltage lithium ion batteries

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Embodiment 1

[0021] The electrolyte is prepared in the BRAUN glove box, which is filled with nitrogen with a purity of 99.999%, the moisture in the glove box is controlled at ≤5ppm, and the temperature is at room temperature. Mix 30 grams of EC and 70 grams of EMC evenly, seal it, put it in the refrigerator and wait for it to cool to 8°C, then transfer it to the glove box, then add LiPF6 in two batches and mix thoroughly to form a lithium salt with a molar concentration of 1mol / L The non-aqueous electrolyte of the lithium-ion battery, in the above non-aqueous electrolyte, add 2-(2-thienylsulfur) thiophene (CAS: 3988-99-6, purchased from Alfa Aisha Chemical Co., Ltd. Co., Ltd.), uniformly mixed to obtain a high-voltage lithium-ion non-aqueous electrolyte.

Embodiment 2

[0023] The electrolyte is prepared in the BRAUN glove box, which is filled with nitrogen with a purity of 99.999%, the moisture in the glove box is controlled at ≤5ppm, and the temperature is at room temperature. Mix 30 grams of EC, 35 grams of EMC and 35 grams of DEC evenly, seal it and put it in the refrigerator until it cools to 8°C, then transfer it to the glove box, then add LiPF6 in two batches and mix well to form a lithium salt mole Concentration is the nonaqueous electrolytic solution of the lithium ion battery of 1.2mol / L, in above nonaqueous electrolytic solution, add the 2-(2-thienylsulfur) thiophene (CAS: 3988-99-6 of purchasing from Alfa Aisha Chemicals Co., Ltd.), mixed evenly to obtain a high-voltage non-aqueous electrolyte.

Embodiment 3

[0025] The electrolyte is prepared in the BRAUN glove box, which is filled with nitrogen with a purity of 99.999%, the moisture in the glove box is controlled at ≤5ppm, and the temperature is at room temperature. Mix 40 grams of EC, 60 grams of EMC and 20 grams of DEC, seal it and put it in the refrigerator until it cools down to 8°C, then transfer it to the glove box, then add LiPF6 in two batches and mix well to form a lithium salt molarity Be the non-aqueous electrolytic solution of the high-voltage battery of 1.2mol / L, add 2-(2-thienylsulfur) thiophene (CAS: 3988-99-6, purchased from Alfa Aisha Chemical Co., Ltd.), uniformly mixed to obtain a high-voltage lithium-ion non-aqueous electrolyte.

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Abstract

The invention discloses a non-aqueous electrolyte of high-voltage lithium ion batteries. The non-aqueous electrolyte comprises following ingredients: a cyclic carbonate, a linear carbonate, a lithium salt and an additive. The cyclic carbonate and the linear carbonate are mixed at a mass ratio of 1:1-3; the molar concentration of the lithium salt in the mixed solution composed by the cyclic carbonate and the linear carbonate is 0.8 to 1.5mol / L; the additive is thienyl thioether compound, and the mass of the additive is 0.01 to 1% of the mass of the solvent. The thienyl thioether compound is capable of forming a polythiophene membrane on the surface of an anode. The anode is coated by the polythiophene membrane, so that conductivity of the material is increased, electrode impedance is decreased, further contact of the electrolyte and the surface of materialis avoided, side reactions are reduced, room temperature cycling performance of the electrolyte is improve effectively, and a problem that the cycling performance of the batteries is poor under high voltage is solved.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and relates to a nonaqueous electrolytic solution of a high-voltage lithium ion battery. Background technique [0002] In recent years, as electronic devices have become smaller and lighter, there is an increasing demand for matching batteries as a power source in the market. Due to the characteristics of small size, light weight and high capacity, lithium secondary batteries have been widely used in people's real life, such as portable electronic and communication devices such as camcorders, portable phones, and notebook computers. [0003] A lithium secondary battery includes a positive electrode, a negative electrode, and an electrolyte. Commonly used lithium secondary batteries include lithium cobaltate, lithium manganate, lithium nickelate, ternary materials, lithium iron phosphate, etc. Among them, lithium cobalt oxide is currently the most widely used lithium secondary batt...

Claims

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Application Information

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IPC IPC(8): H01M10/0567
CPCY02E60/12Y02E60/10
Inventor 王霹霹戴晓兵陈性保梁洪耀梁建斌黄辉宁钟亚娇
Owner ZHUHAI SMOOTHWAY ELECTRONICS MATERIALS
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