Rapid optimization method of electrolyte formula for lithium-ion batteries

A lithium-ion battery and optimization method technology, applied in secondary batteries, electrochemical generators, secondary battery repair/maintenance, etc., can solve the problems of time-consuming and labor-intensive, and the inability to know the decomposition speed of additives, etc.

Active Publication Date: 2022-05-10
TIANJIN LISHEN BATTERY +1
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Problems solved by technology

[0003] The conventional method of evaluating the electrolyte is to inject different electrolytes into the lithium-ion battery for cycle testing, and to screen and adjust the electrolyte formula through the cycle performance. This method cannot know the decomposition speed of various additives and is time-consuming and labor-intensive.

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  • Rapid optimization method of electrolyte formula for lithium-ion batteries
  • Rapid optimization method of electrolyte formula for lithium-ion batteries
  • Rapid optimization method of electrolyte formula for lithium-ion batteries

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Embodiment Construction

[0023] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and preferred embodiments.

[0024] A method for rapidly optimizing the electrolyte formula of a lithium-ion battery, comprising the steps of:

[0025] Prepare a lithium-ion battery electrolyte E1, wherein the lithium salt LiPF6 accounts for 13%, the solvent EC:EMC=3:7 accounts for 83%, the additive A is TMSB and accounts for 2%, and the additive B is VC and accounts for 2%.

[0026] Assemble the electrolyte E1, punched positive electrode sheet, negative electrode sheet, separator and in-situ infrared sample cell into a simple battery Figure 4 show. Test the infrared spectrum absorption peak of electrolyte E1, such as figure 1 Shown in L1. During the experiment, the infrared rays emitted by the light source 5 enter the in-situ infrared sample ce...

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Abstract

The invention belongs to the field of lithium battery testing, and in particular relates to a method for quickly optimizing the formula of a lithium ion battery electrolyte, comprising the following steps: step 1: preparing a lithium ion battery electrolyte according to an existing formula; step 2: assembling a simple battery; Step 3: Carry out the charge-discharge cycle test of the simple battery, and at the same time maintain a certain number of cycle intervals for infrared spectrum testing to observe the consumption speed of various additives in the electrolyte and the change in battery capacity. The present invention provides a method of inferring the consumption rate of various additives and quickly optimizing the formula of the electrolyte by observing the in-situ infrared spectrum changes of the electrolyte during the cycle without making a finished battery and without long-term circulation. method.

Description

technical field [0001] The invention belongs to the field of lithium battery testing, and in particular relates to a method for quickly optimizing the electrolyte formula of a lithium ion battery. Background technique [0002] Lithium-ion batteries have high specific energy, high specific power, many cycles, stable discharge voltage, long storage life and are environmentally friendly. They are widely used in consumer electronics and electric vehicles. Electrolyte undertakes the important task of conducting lithium ions and is a key factor for lithium-ion batteries to obtain higher energy density and safer performance. Therefore, it is very important to develop new electrolytes and optimize electrolyte formulations. [0003] The conventional method of evaluating the electrolyte is to inject different electrolytes into the lithium-ion battery for cycle testing, and to screen and adjust the electrolyte formula through the cycle performance. This method cannot know the decomposi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/42H01M10/0566H01M10/0567H01M10/0568H01M10/0569
CPCH01M10/4235H01M10/42H01M10/0566H01M10/0567H01M10/0568H01M10/0569Y02E60/10
Inventor 王思敏马怡晖刘恋周江
Owner TIANJIN LISHEN BATTERY
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