Electrolyte and lithium ion secondary battery as well as preparation method thereof

A secondary battery and electrolyte technology, applied in the manufacture of electrolyte batteries, secondary batteries, non-aqueous electrolyte batteries, etc., can solve the problems of poor rate performance, poor cycle stability, and low battery energy density, and achieve improved Energy density, excellent cycle stability, effect of mitigating polarization problems

Active Publication Date: 2018-06-19
SHENZHEN INST OF ADVANCED TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The second object of the present invention is to provide a lithium-ion secondary battery. Since the electrolyte in the lithium-ion battery is formed by hybridization of two or more anions with different radii, the insertion of anions in the positive electrode active material can be improved. Layer speed, intercalation speed and the number of anion intercalation, so that the lithium ion secondary battery based on the electrolyte has good energy density, rate performance and cycle stability, which improves the existing dual-ion battery due to the use of a single electrolyte and the electrolyte The medium anion has a large radius, which leads to problems such as low battery energy density, poor rate performance, and poor cycle stability.

Method used

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  • Electrolyte and lithium ion secondary battery as well as preparation method thereof
  • Electrolyte and lithium ion secondary battery as well as preparation method thereof
  • Electrolyte and lithium ion secondary battery as well as preparation method thereof

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preparation example Construction

[0111] In one embodiment of the present invention, the preparation method of above-mentioned lithium ion secondary battery, comprises the following steps:

[0112] (a) preparing the negative electrode: mixing the negative electrode active material, the negative electrode conductive agent, and the negative electrode binder in proportion to form a slurry to make the negative electrode material, coating the negative electrode material on the surface of the negative electrode current collector, and cutting after drying to obtain the negative electrode; or , cutting the metal foil to the required size, drying to obtain the negative electrode;

[0113] (b) preparing the electrolyte: adding the electrolyte lithium salt to the solvent, stirring and mixing to obtain the electrolyte;

[0114] (c) Preparing the diaphragm: cutting the diaphragm into a desired size and drying it to obtain the diaphragm;

[0115] (d) Preparation of the positive electrode: mix the positive electrode active ...

Embodiment 1

[0122] This embodiment is a lithium ion secondary battery, including a negative electrode, a diaphragm, an electrolyte and a positive electrode. Wherein, the specific material composition and preparation method of the lithium-ion secondary battery are as follows:

[0123] (a) Preparation of positive electrode: Add 0.8g of expanded graphite, 0.1g of carbon black, and 0.1g of polyvinylidene fluoride to 2mL of N-methylpyrrolidone, grind thoroughly to obtain a uniform slurry; then evenly coat the slurry on the surface of the aluminum foil (i.e. the positive electrode current collector) and vacuum-dried at 80°C for 12 hours; finally, the dried electrode sheet was punched into a disc with a diameter of 12mm, and was used as the positive electrode after compaction;

[0124] (b) Preparing the diaphragm: cutting the glass fiber paper into discs with a diameter of 16 mm, drying in vacuum for subsequent use;

[0125] (c) Preparation of electrolyte: Weigh 3.0g of lithium hexafluorophosph...

Embodiment 2

[0129] This embodiment provides a lithium ion secondary battery, wherein the electrolyte lithium salt adopts lithium hexafluorophosphate (LiPF 6 ) and bis(trifluoromethylsulfonyl)imide lithium (LiTFSI), the molar ratio is 1:1, and others are the same as in Example 1.

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Abstract

The invention provides electrolyte and a lithium ion secondary battery as well as a preparation method, which relates to the field of batteries. The electrolyte is prepared from a solvent and two or more electrolyte lithium salts, wherein positive ions of the electrolyte are lithium ions, and negative ions are two or more ions with different radius. The invention also provides a lithium ion secondary battery. The lithium ion secondary battery comprises a positive electrode, a negative electrode as well as a diaphragm positioned between the positive electrode and the negative electrode and theelectrolyte, since the electrolyte adopts two or more negative ions with different radius, the intercalation speed, the de-intercalation speed and the negative ion intercalation amount of the negativeions in a positive electrode active material can be increased, so that the lithium ion secondary battery based on the electrolyte has higher energy density, excellent rate capability and high cyclingstability, and the problems of the existing ion battery adopting the single electrolyte that the large radius of the negative ions in the electrolyte leads to the lower energy density, poor rate capability and poor cycling stability of the battery can be solved.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to an electrolyte solution, a lithium ion secondary battery and a preparation method thereof. Background technique [0002] With the increasing energy crisis and environmental pollution, it is imperative to develop and make full use of renewable clean energy. In this context, in order to reduce pollution during the use of fossil fuels, the scientific community and the industry have proposed a variety of new energy storage models, including the development of sustainable renewable energy from wind, light, and electricity, as well as new power batteries and high-efficiency energy storage systems. The secondary battery has always occupied a pivotal position. The so-called secondary battery is a rechargeable battery, which has the ability to be repeatedly charged and discharged and used many times. Compared with ordinary non-reusable primary batteries, secondary batteries have the a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0568H01M10/0525H01M10/058
CPCH01M10/0525H01M10/0568H01M10/058H01M2300/0025Y02E60/10Y02P70/50
Inventor 唐永炳张帆陈光海申京受
Owner SHENZHEN INST OF ADVANCED TECH
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