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Electrolyte and lithium ion battery

An electrolyte and lithium salt technology, which is applied in the field of electrolyte and lithium-ion batteries, can solve the problems that the capacity cannot be significantly improved and the battery volume cannot be too large, so as to protect the interface between positive and negative electrodes, reduce deposition, and lower temperature rise Effect

Inactive Publication Date: 2018-11-30
HIGHPOWER TECH HUIZHOU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Considering the portability of the mobile phone, the volume of the battery cannot be too large, and its capacity cannot be significantly improved
Therefore, improving the battery life of mobile phones can only be achieved through fast charging.

Method used

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  • Electrolyte and lithium ion battery
  • Electrolyte and lithium ion battery
  • Electrolyte and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030]

[0031] DCKVEA in the present invention can at least select the following method to prepare:

[0032] Select 3.0 mol of TCNE (tetracyanoethylene), 2.0 mol of urea (urea) and 18 mol of 3,4-dihydroxy-1-butene to mix, heat to 100°C while stirring, and keep warm for 1 hour to obtain a brown solution. Continuously add cold water and dichloromethane to cool it down, extract the dichloromethane, and then dry it in a vacuum oven at 40°C for 12 hours to obtain the product DCKVEA.

[0033]

[0034] The specific preparation process of the electrolyte is as follows: ethylene carbonate, diethyl carbonate and propylene carbonate are uniformly mixed in a mass ratio of 1:1:1 as an organic solvent. To this organic solvent was added DCKVEA and propylene sulfite. After mixing well, add LiPF 6 , to get LiPF 6 The mixed solution with a concentration of 1.1mol / L is the electrolyte.

[0035] In the electrolyte, the mass fractions of DCKVEA and propylene sulfite are 3% and 5%, respe...

Embodiment 2

[0044] According to the method in Example 1, the mass fraction of the mass of the solvent and the mixed solution was adjusted, and the electrolyte solution was prepared according to the ratio in Table 1. Among them, DCKVEA and sulfur-containing compounds are both mass fractions, PS is propylene sulfite, DTD is vinyl sulfate, and PST is propylene sultone.

[0045] Table 1. Additive ratio in different electrolytes

[0046]

[0047] The electrolyte solutions prepared according to the above L1# to L19# were respectively prepared according to the method in Example 1 to obtain C1# to C19# lithium ion batteries.

[0048]

[0049] Place the battery in a thermostat at 25°C, charge it at rates of 0.5C, 1C, 3C, and 5C, and calculate the temperature rise of the battery at rates of 1C, 3C, and 5C. Temperature rise means the battery surface temperature when the battery is charged at 1C, 3C, and 5C minus the battery surface temperature when it is charged at 0.5C.

[0050] Table 2. Te...

Embodiment 3

[0054] On the basis of Example 2, we carried out further performance evaluation on the prepared lithium-ion battery, and compared the low-temperature performance during the test. The specific experimental steps and results are as follows:

[0055]

[0056] The prepared lithium-ion battery was placed in a constant temperature box at 0°C, charged and discharged at a rate of 0.5C / 0.5C, and cycled 10 times. After the battery was disassembled, the lithium precipitation at the negative electrode interface was observed. The results are shown in Table 2. The degree of lithium analysis is defined according to the range of lithium analysis: no lithium analysis (0%), slight lithium analysis (0-10%), lithium analysis (10-30%), severe lithium analysis (greater than 30%).

[0057] Table 2. Lithium ion battery analysis test with different additives

[0058] battery number

[0059] At least 10% lithium precipitation occurred in C1#~C5#, respectively, when no additives were adde...

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Abstract

The invention provides an electrolyte capable of improving quick charge capacity of a lithium ion battery and a lithium ion battery obtained from the electrolyte. The electrolyte comprises an organicsolvent, lithium salt and additives, wherein the additives comprise DCKVEA and a sulfocompound. The electrolyte provided by the invention increases the film-forming property of the electrolyte under high voltage, stable passive films can be formed at both the positive electrode and negative electrode, the film-forming impedance is low, the thickness is small, meanwhile, the deposition of metal impurities in the negative electrode is reduced, the positive electrode and negative electrode interfaces are protected, so that the prepared lithium ion battery has lower temperature rise under the condition of large multiplying power charging.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to an electrolyte solution and a lithium ion battery. Background technique [0002] Since the Japanese SONY company successfully commercialized lithium-ion batteries in the 1990s, lithium-ion batteries have been widely used in the field of electronic products. Compared with other traditional storage batteries, lithium-ion batteries have the characteristics of high specific energy, strong high-current discharge capacity, long cycle life, and high energy storage efficiency. Lithium-ion battery has therefore become the most competitive battery of the new generation, known as "green energy", and is the preferred technology to solve contemporary environmental pollution and energy problems. [0003] In recent years, with the accelerated pace of people's life and the rapid development of various electronic products, people have put forward higher requirements for the performance of lith...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0525
CPCH01M10/0525H01M10/0567Y02E60/10
Inventor 杜冬冬李枫路晨昊于立娟廖兴群
Owner HIGHPOWER TECH HUIZHOU
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