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Electrolyte and lithium ion battery containing the electrolyte and preparation method thereof

A technology of electrolyte and content, applied in the field of electrolyte, can solve the problem of not being able to improve the overcharge performance of the battery, and achieve the effect of improving the overcharge performance

Active Publication Date: 2009-06-24
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to overcome the disadvantage that the electrolyte of the battery in the prior art cannot improve the overcharge performance of the battery while ensuring that the high-temperature storage performance and cycle performance of the battery are not negatively affected, and provide a battery that can improve the overcharge performance of the battery. performance, while ensuring that the high-temperature storage performance and cycle performance of the battery are not negatively affected by the lithium-ion battery electrolyte

Method used

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  • Electrolyte and lithium ion battery containing the electrolyte and preparation method thereof
  • Electrolyte and lithium ion battery containing the electrolyte and preparation method thereof
  • Electrolyte and lithium ion battery containing the electrolyte and preparation method thereof

Examples

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preparation example Construction

[0035] The preparation method of the electrolyte provided by the present invention comprises mixing lithium salt, an organic solvent and an additive, wherein the additive contains additive one and additive two, and the additive one is selected from biphenyl and / or its halide, 1, One or more of 2-dimethoxybenzene, furan or thiophene, the second additive is cyclohexylbenzene and / or its halides, and the weight ratio of the first additive to the second additive is 1:5 to 1 : 1; based on the total amount of the electrolyte, the content of the additive is 3-7% by weight; the content of the first additive is 1-2% by weight; the content of the second additive is 2-5% by weight.

[0036] The mixing method of the lithium salt, the organic solvent and the additive is that the additive and the organic solvent are fully mixed first, and then the lithium salt is added. According to the principle of like dissolves like, therefore, it is preferable to fully mix the organic solvent and the add...

Embodiment 1

[0047] This example illustrates the electrolyte solution provided by the present invention, batteries containing the electrolyte solution and their preparation methods.

[0048] (1) Preparation of electrolyte

[0049] In 210 ml of mixed solvent of ethylene carbonate: dimethyl carbonate = 1:1 (volume ratio), add 2.95 g of biphenyl and 8.85 g of cyclohexylbenzene, then add 31.90 g of LiPF 6 Prepared as a 1.0 mol / L solution. Based on the total amount of the obtained electrolyte, the content of biphenyl is 1% by weight; the content of cyclohexylbenzene is 3% by weight; the weight ratio of biphenyl to cyclohexylbenzene is 1:3.

[0050] (2) Preparation of positive electrode

[0051] Dissolve 30 grams of polyvinylidene fluoride (PVDF) in 450 grams of N-methylpyrrolidone (NMP) solvent to prepare a binder solution, and then mix 940 grams of LiCoO 2 Add 30 grams of acetylene black powder to the above solution, stir and mix evenly to obtain a positive electrode slurry; use a pulper to...

Embodiment 2-5

[0057] The electrolyte and the lithium-ion battery were prepared according to the method of Example 1, except that the added organic matter and the content and ratio of the two organic matter were based on the total amount of the electrolyte, as shown in Table 1 below.

[0058] Table 1

[0059]

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Abstract

An electrolytic solution, the electrolytic solution contains a lithium salt, an organic solvent and an additive, wherein the additive contains a compound one and a compound two, and the compound one is selected from biphenyl and / or its halide, 1,2-bis One or more of methoxybenzene, furan or thiophene, the compound two is cyclohexylbenzene and / or its halide, and the weight ratio of the compound one and compound two is 1:5 to 1:1; Based on the total amount of the electrolyte, the content of the additive is 3-7% by weight; the content of compound one is 1-2% by weight; the content of compound two is 2-5% by weight. The battery with the electrolyte solution containing additives in a specific weight ratio provided by the invention not only improves the overcharge safety of the battery, but also maintains good cycle performance and high-temperature storage stability.

Description

technical field [0001] The present invention relates to an electrolytic solution, a battery containing the electrolytic solution and their preparation method, in particular to a non-aqueous electrolytic solution, a lithium ion battery containing the electrolytic solution and their preparation method. Background technique [0002] Lithium-ion battery is a new type of chemical power source, which is widely used in portable electronic products such as mobile phones because of its high energy density, high working voltage, long life, and no environmental pollution. [0003] A lithium-ion battery includes a positive electrode, a negative electrode, a separator, and an electrolyte. The electrolytic solution includes a lithium salt as an electrolyte, an organic solvent and additives. If the battery charging control circuit fails, the battery may be charged in a state exceeding the rated voltage (that is, overcharged); at this time, excessive lithium ions in the positive electrode ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/40H01M6/16C07C15/14C07C13/19C07C25/00C07C25/18H01M10/0525H01M10/0567H01M10/058
CPCY02E60/122Y02E60/10Y02P70/50
Inventor 渠冰杜显忠
Owner BYD CO LTD