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Lithium ion battery electrolyte and battery and battery set containing the same

A lithium-ion battery and electrolyte technology, applied in secondary batteries, circuits, electrical components, etc., can solve the problems of poor low-temperature discharge performance and high-temperature storage performance, and cannot limit the uniform voltage of each single battery, so as to improve consistency, The effect of excellent low temperature discharge performance

Active Publication Date: 2009-07-29
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The purpose of the present invention is to overcome the disadvantages of overcharge safety, low-temperature discharge performance and high-temperature storage performance in lithium-ion batteries containing the lithium-ion battery electrolyte of the prior art, and the inability to limit the uniform voltage of each single battery when forming a battery pack The problem is to provide a lithium-ion battery electrolyte that can improve the overcharge safety, low-temperature discharge performance, and high-temperature storage performance of lithium-ion batteries, and the battery pack composed of batteries made of the electrolyte is in the process of cycling. Has good voltage consistency

Method used

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  • Lithium ion battery electrolyte and battery and battery set containing the same
  • Lithium ion battery electrolyte and battery and battery set containing the same
  • Lithium ion battery electrolyte and battery and battery set containing the same

Examples

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preparation example Construction

[0043] The preparation method of the lithium ion battery provided by the present invention may be a method for preparing a lithium battery known in the art, for example, including setting a separator between the prepared positive electrode and the negative electrode to form an electrode group, and the electrode group is accommodated in a battery case , inject electrolyte, and then seal the battery case to make a lithium-ion battery. The preparation method of the positive electrode includes coating the slurry containing the positive electrode active material, the binder and the optionally contained conductive agent on the positive electrode current collector, drying, rolling and slicing to obtain the positive electrode. The drying is usually carried out at 50-160°C, preferably 80-150°C. The preparation method of the negative electrode is the same as that of the positive electrode, except that the slurry containing the positive active material, the binder and the conductive agen...

Embodiment 1

[0048] This embodiment is used to illustrate the preparation of the lithium ion battery electrolyte provided by the present invention.

[0049] At room temperature, in a glove box, ethylene carbonate, dimethyl carbonate, and ethyl methyl carbonate were mixed in a weight ratio of 1:1:1, and LiPF was added to it 6 The electrolyte is made into a solution with a concentration of 1 mol / liter. Then, add mixed additives therein, based on 100 parts by weight of the electrolyte, the amount of mixed additives is 5 parts by weight, and stir evenly. The composition of the mixed additives added was: naphthalene, thianthrene and 3-chloroanisole (Aldrich Chemical Company) in a weight ratio of 2:1:1. The prepared electrolyte sample is denoted as A1.

Embodiment 2

[0051] This embodiment is used to illustrate the preparation of the lithium ion battery electrolyte provided by the present invention.

[0052] According to the same method as in Example 1, the difference is that the amount of mixed additives added is 2 parts by weight, consisting of: thianthrene and 4-bromo-1,2-dimethoxybenzene in a weight ratio of 2:1 (Aldrich Chemical Company). The prepared electrolyte sample is denoted as A2.

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Abstract

The invention provides an electrolyte of a lithium ion battery, which contains lithium salts, nonaqueous solvents and an addictive, wherein, the additive is selected from two or more than two varieties of an additive A, an additive B and an addictive C; the addictive A is one more types of fused ring compounds and condensed heterocyclic compounds; the addictive B is an aromatic compound containing alkoxy; the addictive C is a halogenated borane salt. The invention also provides a lithium ion battery and a battery set made by the electrolyte. The nonaqueous electrolytic solution can obviously raise the consistency of each single cell voltage in the discharging process of the battery set and the safety property of each single battery (and the battery set). The lithium ion battery containing the nonaqueous electrolytic solution has good low-temperature discharging property, high-temperature storage and cycling property.

Description

technical field [0001] The invention relates to a lithium ion battery electrolyte, a lithium ion battery containing the electrolyte and a battery pack composed of the lithium ion battery. Background technique [0002] Due to the outstanding advantages of high voltage and high energy density, lithium-ion batteries are widely used in various mobile electronic devices and power tools. However, with the rapid development of portable electronic devices, on the one hand, it is necessary to develop batteries with higher capacity, longer service life and higher energy density than conventional lithium-ion batteries; on the other hand, people are concerned about the safety of lithium-ion batteries Make higher and higher demands. [0003] Lithium-ion batteries are a system composed of high-energy materials and flammable non-aqueous electrolytes. Unlike aqueous electrolyte batteries, lithium-ion batteries themselves do not have a balance adjustment mechanism (such as: gasification). ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/40H01M10/36
CPCH01M10/4235Y02E60/122H01M10/0568H01M10/0525H01M10/0567Y02E60/10
Inventor 高艺朱江民
Owner BYD CO LTD
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