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Electrolytic solution for improving lithium manganate lithium ion battery performance

A lithium-ion battery and electrolyte technology, applied in secondary batteries, circuits, electrical components, etc., can solve problems such as capacity decay, electrolyte decomposition acceleration, explosion, etc., to slow down capacity decay, suppress co-insertion, and enhance circulation. performance effect

Inactive Publication Date: 2009-01-21
SHENZHEN HAIYING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The situation of overcharging the battery is more likely to occur, and the overcharging of the battery will further increase the temperature of the battery, accelerate the decomposition of the electrolyte, and further reduce the capacity, resulting in a vicious cycle, and even lead to thermal runaway of the battery, fire, explosion, etc.
[0011] In addition, propylene carbonate, a commonly used component in the current lithium-ion electrolyte, still has a phenomenon of co-intercalation with the negative electrode in the current electrolyte, which affects the cycle performance of lithium-ion batteries.

Method used

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  • Electrolytic solution for improving lithium manganate lithium ion battery performance
  • Electrolytic solution for improving lithium manganate lithium ion battery performance
  • Electrolytic solution for improving lithium manganate lithium ion battery performance

Examples

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Effect test

Embodiment 1

[0030] In addition to ethylene carbonate, ethyl methyl carbonate, diethyl carbonate, propylene carbonate, and lithium hexafluorophosphate, the electrolytic solution for improving the performance of lithium manganate lithium ion battery provided by this embodiment also contains a film-forming additive. The additives may be, but not limited to, consist of 1,3-propane sultone, lithium bisoxalate borate.

[0031] Since the film-forming additive is included in the electrolyte of the lithium manganate lithium-ion battery, when the battery is formed, the film-forming additive forms a stable high-temperature-resistant passivation film (SEI film) on the electrode surface, which can effectively inhibit the positive electrode (main material) of the battery. Lithium manganese oxide) reacts with the electrolyte to reduce the dissolution of manganese ions, ensure that the battery has good high-temperature storage performance, and slow down the capacity decay of the battery during cycling.

...

Embodiment 2

[0036] As a preferred embodiment, the lithium manganate lithium ion battery electrolyte of this embodiment includes: ethylene carbonate, ethyl methyl carbonate, diethyl carbonate, propylene carbonate, lithium hexafluorophosphate, 1,3-propane sultone , Lithium oxalate borate. Wherein the proportioning of each component is as follows:

[0037] The weight ratio content of ethylene carbonate is 20-30%, the weight ratio content of ethyl methyl carbonate is 20-30%, the weight ratio content of diethyl carbonate is 20-30%, and the weight ratio content of propylene carbonate is 20%. ~30%, 1,3-propane sultone ratio content is 5~15%, lithium hexafluorophosphate concentration is 0.5~0.9mol / L, lithium bisoxalate borate concentration is 0.1~0.5mol / L.

[0038] Due to the addition of additives in this embodiment, the film-forming action of the film-forming additive has suppressed the effect with the negative electrode of graphite, so the content of propylene carbonate can be appropriately in...

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PUM

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Abstract

The invention relates to the field of lithium batteries, disclosing an electrolyte which can be used to improve the performance of LiMn2O4 Li-ion battery, composed of ethylene carbonate, methyl ethyl carbonate, diethyl carbonate, propylene carbonate, 1,3-propane sultone, lithium hexafluorophosphate and lithium bis(oxalate)borate. During battery formation, the film forming additive forms a stable high-temperature resisting passivating film (SEI film) on the surface of the electrode, and the film is capable of restraining the reaction between the battery anode (mainly composed of LiMn2O4) and the electrolyte, reducing Mn-ion dissolution and alleviating the capacity attenuation of the battery during the cyclic process.

Description

technical field [0001] The invention relates to the field of lithium batteries, in particular to a lithium manganate lithium ion battery electrolyte. Background technique [0002] Lithium battery is currently the most widely used energy source. Lithium-ion batteries currently on the market are mainly based on LiCoO 2 As the positive electrode, but the current cobalt resources are increasingly scarce, so another resource-rich raw material is sought to replace LiCoO 2 It is an inevitable trend in the development of lithium-ion batteries. [0003] With the development of lithium-ion power batteries, this demand has become more urgent. Since the spinel LiMn 2 o 4 Low cost, safety, environmental protection and other advantages, therefore, spinel LiMn 2 o 4 is an alternative to LiCoO 2 an ideal material. [0004] However, spinel LiMn 2 o 4 The compatibility with the current electrolyte is poor, and the following two kinds of dissolution will occur in the electrolyte: ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/40H01M10/0567H01M10/0569
CPCY02E60/122Y02E60/10
Inventor 殷振国郭永兴陶芝勇曾坚义
Owner SHENZHEN HAIYING TECH
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