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Electrolyte taking propylene carbonate as main solvent and secondarily liquid injected lithium ion battery

A technology of propylene carbonate and lithium-ion batteries, applied in the field of lithium-ion batteries, can solve problems affecting battery performance, poor cycle performance, and low reversible capacity of batteries, and achieve good compatibility and wide application range

Inactive Publication Date: 2016-03-30
ZHUHAI SMOOTHWAY ELECTRONICS MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 structure. Destruction, resulting in low reversible capacity of the battery, poor cycle performance, and seriously affecting battery performance. Therefore, at present, a small amount of PC is mainly added as an additive to improve the low-temperature performance of the electrolyte, and it cannot replace EC as the main component of the solvent.

Method used

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  • Electrolyte taking propylene carbonate as main solvent and secondarily liquid injected lithium ion battery
  • Electrolyte taking propylene carbonate as main solvent and secondarily liquid injected lithium ion battery
  • Electrolyte taking propylene carbonate as main solvent and secondarily liquid injected lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 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:=1:9 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 lithium-ion batteries with a molar concentration of lithium salt of 2.6mol / L, add a conventional additive 1% VC to the above non-aqueous electrolyte solution, and mix uniformly to obtain a lithium-ion non-aqueous electrolyte solution.

[0027] 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) with a mass percentage of 96% The conductive agent carbon black with a ...

Embodiment 2

[0033] Example 2 The first liquid injection volume is 60%, the second injection volume is 40% after formation, the conventional electrolyte solution for the second injection is EC:EA=1:1, the concentration is 1M, and the solvent is LiPF 6 .

Embodiment 3

[0034] Example 3 The first injection volume is 90%, the second injection volume is 10% after formation, the second injection electrolyte is EC:EA=3:7, the concentration is 1M, and the solvent is LiPF 6 .

[0035] The amount of liquid injected for the first time in Comparative Examples 1-4 was 100%, and no liquid was injected after formation.

[0036] As shown in Table 1 to Table 3, the various indicators and performance tests of the embodiments and comparative examples carried out by the present invention are as shown in the table.

[0037] Table 1: Comparison table of positive and negative electrodes and solvent materials and contents of batteries used in Comparative Examples 1-4 and Examples 1-6.

[0038]

[0039] Note: LMO, lithium manganese oxide; LFP, lithium iron phosphate; LCO, lithium cobalt oxide.

[0040] Table 2: LiPF used in Comparative Examples 1-4 and Examples 1-6 6 Concentration, additives and additive dosage comparison table.

[0041]

[0042] Table 3...

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Abstract

The invention aims at providing electrolyte containing functional additives and taking propylene carbonate as the main solvent, and a secondarily liquid injected lithium ion battery comprising the electrolyte taking propylene carbonate as the main solvent. In the invention, the electrolyte comprises nonaqueous organic solvent, electrolyte salt and additives; the nonaqueous organic solvent comprises a main component propylene carbonate, wherein the propylene carbonate is 50%-10% of the total mass of the electrolyte; the electrolyte salt is lithium salt; the concentration of the lithium salt is 2.5-4.0 mol / L; the additives comprise general film-forming additives; the secondarily liquid injected lithium ion battery comprises cathode, anode, diaphragm and the electrolyte taking the propylene carbonate as the main solvent. Through using the secondary liquid injection method, the PC solvent is prevented from co-intercalation, therefore the primary efficiency of the battery is clearly promoted, and the normal temperature cycle performance and the low temperature discharging performance of the battery are improved.

Description

technical field [0001] The invention relates to the field of lithium-ion batteries, in particular to a lithium-ion battery electrolyte using propylene carbonate (PC) as the main solvent of the electrolyte. The lithium salt concentration in the electrolyte is high, and after forming a solvation product with PC, it can inhibit PC embeds graphite to form a LiF-based SEI film, which can significantly improve the first-time efficiency, cycle performance, and low-temperature discharge performance of the battery; and a lithium-ion battery containing the secondary injection of the electrolyte. 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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0568H01M10/0525H01M10/058
CPCH01M10/0525H01M10/0568H01M10/058H01M2300/0028Y02E60/10Y02P70/50
Inventor 戴晓兵王霹霹
Owner ZHUHAI SMOOTHWAY ELECTRONICS MATERIALS
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