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Additive capable of improving high-temperature cycle life of lithium battery, non-aqueous lithium ion battery electrolyte containing the same and lithium ion battery

A lithium-ion battery, high-temperature cycle technology, applied to secondary batteries, secondary battery repair/maintenance, circuits, etc., can solve customer complaints and satisfaction decline, rapid popularization of electric vehicles, fast charging function failure and other issues, To achieve the effect of guaranteeing performance and safety performance

Active Publication Date: 2019-09-06
商丘神风能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, if the current is changed from 1 to 2, the heat generated will increase by 4 times, and the temperature protection value for power reduction is generally set at 45°C to 50°C, which causes that in summer, due to the high ambient temperature, The heat generated by high-current charging causes the battery to heat up rapidly, and the temperature can quickly reach the temperature protection value to reduce the charging power. The fast charging function can only last for a short period of time, and the fast charging function is basically invalid. From the user's point of view The waiting time for charging caused by fast charging will be greatly increased, which will further cause customer complaints and decline in satisfaction, and increase obstacles to the rapid popularization of electric vehicles
[0004] The reason why lithium batteries cannot be charged and discharged at high temperatures is mainly because the current lithium batteries basically use liquid organic electrolytes, which are characterized by volatilization and side effects when the temperature reaches 70°C under standard atmospheric pressure. reaction, the internal components of the battery are vaporized, so that the battery electrolyte cannot fully and effectively react, change the composition of the electrolyte between the positive and negative electrodes, increase the internal resistance of the electrolyte and weaken the performance of all aspects, so that the battery life rapidly decays, seriously even It may lead to the precipitation of lithium dendrites, causing a short circuit inside the battery and causing safety problems
At the same time, if the gas generated exceeds a certain amount, it will affect the performance of the battery. The most obvious is that the pouch battery will produce flatulence, and the square aluminum shell and cylindrical battery will cause the pressure relief valve to open, affecting the normal use of the battery.
If the temperature continues to rise, there will be a risk of fire and explosion

Method used

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  • Additive capable of improving high-temperature cycle life of lithium battery, non-aqueous lithium ion battery electrolyte containing the same and lithium ion battery
  • Additive capable of improving high-temperature cycle life of lithium battery, non-aqueous lithium ion battery electrolyte containing the same and lithium ion battery
  • Additive capable of improving high-temperature cycle life of lithium battery, non-aqueous lithium ion battery electrolyte containing the same and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] 1. Electrolyte preparation: Prepare the electrolyte in the glove box, which is filled with nitrogen with a purity of 99.999%, the moisture in the glove box is controlled at ≤5ppm, and the temperature is room temperature (23°C±1°C). Mix the solvent system with a mass ratio of DMC:DEC:EC=3:4:3 evenly, seal it, put it in the refrigerator until it cools down to 10°C, transfer it to the glove box, and then add it to LiPF 6 Fully mix to form a lithium salt molar concentration of 1mol / L in the non-aqueous electrolyte of the lithium battery, and then add n-butanol (CH 3 (CH 2 ) 3 OH), so that it contains 10ppm n-butanol (CH 3 (CH 2 ) 3 OH) non-aqueous electrolyte, after uniform mixing, the non-aqueous lithium battery electrolyte is obtained.

[0021] 2. Preparation of lithium battery positive electrode: Prepare lithium battery positive electrode in a dry room (dew point controlled at -50, humidity below 1%, temperature 23±1°C). Mix the nickel-cobalt-manganese ternary mate...

Embodiment 6-9

[0032] Replace n-butanol with additive n-hexanol.

[0033] The configuration and manufacturing method of Embodiment 6-9 are carried out with reference to the configuration and method of Embodiment 1.

[0034] As shown in table 2, each index and test result of embodiment 6-9 that the present invention carries out are as shown in the table:

[0035] Table 2 is the comparison of electrolyte vaporization temperature data after adding different contents of n-hexanol additives

[0036]

[0037] The present invention is a brand-new high-temperature-resistant lithium battery. The electric vehicle produced by using the battery can have a wider operating temperature range and is more suitable for use in a high-temperature environment. It is specifically reflected in the continuous high-current operation in hot summer. Fast charging, improve the charging speed of electric vehicles, and reduce the waiting time for users to charge.

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Abstract

The present invention discloses an additive capable of improving high-temperature cycle life of a lithium battery, a non-aqueous lithium ion battery electrolyte containing the same and a lithium ion battery. The additive is one or a mixture of two or more of organic or inorganic compounds with a hydroxyl (-OH) group, a carboxyl (-COOH) group or an aldehyde (-CHO) group. The non-aqueous lithium ionbattery electrolyte comprises electrolyte salt, a non-aqueous organic solvent and an additive capable of improving the high-temperature cycle life of the lithium battery. The ratio of the additive inthe non-aqueous lithium ion battery electrolyte is 1-100ppm. The lithium ion battery comprises a positive electrode, a negative electrode, a separator and the non-aqueous lithium ion battery electrolyte. The additive can suppress the volatilization of the organic solvent component in the electrolyte, thereby the service performance and safety performance of the battery under a high temperature are ensured.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to an additive capable of improving the high-temperature cycle life of lithium batteries, a non-aqueous lithium ion battery electrolyte containing the additive, and a lithium ion battery. Background technique [0002] In recent years, due to environmental protection pressure and energy issues, countries are actively promoting new energy vehicles. Among new energy vehicles, pure electric vehicles are developing faster and faster, and their market share is also increasing. With the increase of pure electric vehicles, while the advantages of electric vehicles are becoming more and more obvious, their disadvantages are also gradually emerging, especially the slow charging speed and long waiting time, which have gradually become the biggest obstacles hindering the rapid popularization of electric vehicles. [0003] In response to this problem, major automobile m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/42H01M10/0525
CPCH01M10/0567H01M10/4235H01M10/0525Y02E60/10
Inventor 潘青海陈娟韩卫东
Owner 商丘神风能源科技有限公司