Electrolyte employing propylene carbonate as main solvent and lithium-ion battery

A propylene carbonate, lithium-ion battery technology, applied in the field of lithium-ion battery electrolyte, can solve problems such as poor cycle performance, damage to graphite electrode structure, and impact on battery performance.

Inactive Publication Date: 2015-12-23
ZHUHAI SMOOTHWAY ELECTRONICS MATERIALS
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  • Abstract
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Problems solved by technology

[0002] At present, graphite materials such as natural graphite are the most used in lithium-ion battery anode materials, and PC solvent cannot form an effective passivation film on the surface of these graphite electrodes, and it is easy to intercalate with lithium ions into the graphite layer, causing damage to the graphite electrode struc

Method used

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  • Electrolyte employing propylene carbonate as main solvent and lithium-ion battery
  • Electrolyte employing propylene carbonate as main solvent and lithium-ion battery
  • Electrolyte employing propylene carbonate as main solvent and lithium-ion battery

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Embodiment 1

[0020] 1. Electrolyte preparation: The electrolyte is prepared in a BRAUN glove box filled with nitrogen gas with a purity of 99.999%, the moisture in the glove box is controlled at ≤5ppm, and the temperature is at room temperature. Mix the solvent system with a mass ratio of EC:PC:EMC=1:2:7 evenly, seal it, put it in the refrigerator until it cools down to 8°C, transfer it to the glove box, and then add LiPF in two batches 6 Mix well to form a non-aqueous electrolyte solution for a lithium-ion battery with a lithium salt molar concentration of 1mol / L, and add CsC to the above non-aqueous electrolyte solution 5 h 5 NPF 6 Make it contain 0.01M CsC 5 h 5 NPF 6 The non-aqueous electrolyte solution is uniformly mixed to obtain a lithium-ion non-aqueous electrolyte solution.

[0021] 2. Preparation of positive electrode for lithium-ion battery: Dissolve polyvinylidene fluoride (PVDF) with a mass percentage of 3% in 1-methyl-9-pyrrolidone solution, and lithium cobaltate (LCO) w...

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Abstract

The invention discloses an electrolyte employing propylene carbonate as a main solvent and a lithium-ion battery. The electrolyte is prepared from a lithium salt, an organic solvent and an additive, wherein the organic solvent comprises the propylene carbonate and other non-aqueous solvents; the propylene carbonate is 10%-60% of total mass of the electrolyte; the additive comprises a conventional film-forming additive and a novel functional additive AB or AXB; the content of the conventional film-forming additive in the electrolyte is 0.1%-10%; and the molar concentration of the functional additive is 0.001mol/L to 0.1mol/L, preferably 0.03mol/L to 0.06mol/L. According to the functional additive of the electrolyte, an electrolyte system can be prompted to form stable interfacial films on the surfaces of a cathode and an anode; a propylene carbonate solvent is effectively restrained from being embedded into a graphite layer along with lithium ions; and the initial efficiency, the cycle performance and the low-temperature discharge property of the battery are effectively improved.

Description

technical field [0001] The present invention relates to lithium ion battery electrolyte, particularly relate to a kind of lithium ion battery electrolyte that adopts propylene carbonate (PC) as the main solvent of electrolyte, in this electrolyte, add the additive that can suppress PC to embed graphite negative electrode, thereby can Significantly improve the first-time efficiency, cycle performance and low-temperature discharge performance of the battery. Background technique [0002] At present, graphite materials such as natural graphite are the most used in lithium-ion battery anode materials, and PC solvent cannot form an effective passivation film on the surface of these graphite electrodes, and it is easy to intercalate with lithium ions into the graphite layer, causing damage to the graphite electrode structure. Destruction leads to low reversible capacity of the battery, poor cycle performance, and seriously affects battery performance. Therefore, at present, a smal...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0569H01M10/0525
CPCH01M10/0525H01M10/0569H01M2300/0037Y02E60/10
Inventor 戴晓兵
Owner ZHUHAI SMOOTHWAY ELECTRONICS MATERIALS
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