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Electrolyte and electrochemical device

An electrochemical and electrolyte technology, applied in the field of energy storage, can solve problems such as poor storage performance and high film resistance of lithium-ion batteries

Active Publication Date: 2020-08-14
NINGDE AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At the same time, lithium-ion batteries also have problems such as high film resistance and poor storage performance.

Method used

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  • Electrolyte and electrochemical device
  • Electrolyte and electrochemical device
  • Electrolyte and electrochemical device

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0104] The negative electrode can be prepared by a preparation method known in the art. For example, the negative electrode may be obtained by mixing an active material, a conductive material, and a binder in a solvent to prepare an active material composition, and coating the active material composition on a current collector.

[0105] Separator

[0106] In some embodiments, the electrochemical device of the present application is provided with a separator between the positive electrode and the negative electrode to prevent short circuit. The material and shape of the separator used in the electrochemical device of the present application are not particularly limited, and it can be any technology disclosed in the prior art. In some embodiments, the separator includes a polymer or an inorganic material formed of a material stable to the electrolyte of the present application.

[0107] For example, a separator may include a substrate layer and a surface treatment layer. The ...

Embodiment 19

[0128] The positive pole of embodiment 19:

[0129] The preparation method of the positive electrode is similar to that of Example 4, only the positive electrode active material is not exactly the same and the area ratio of nickel-cobalt lithium manganese oxide and lithium manganate is different, and the area ratio is different by controlling the quality of nickel-cobalt lithium manganate and lithium manganate ratio, and the particle size of nickel-cobalt lithium manganese oxide and lithium manganate particles, as long as the technical solution can be realized.

[0130] The positive electrodes of Example 20 to Example 55 and Comparative Example 4 to Comparative Example 5

[0131] The preparation method of the positive electrode is exactly the same as in Example 18.

[0132] (3) Preparation of electrolyte

[0133] In an argon atmosphere glove box, ethylene carbonate (EC), ethyl methyl carbonate (EMC), and diethyl carbonate (DEC) were mixed according to a mass ratio of EC:EMC:...

Embodiment 1

[0172] The X-ray photoelectron spectroscopy test result of the positive electrode active material layer of embodiment 1 is as follows figure 1 Shown, the XPS spectrum of the positive electrode active material layer of embodiment 1 has a peak at 164 to 175eV, and the XPS spectrum of the positive electrode active material layer of comparative example 3 has no peak at 164 to 175eV (that is, its XPS spectrum shows at 164 to 175eV place baseline).

[0173] As shown in Table 2, similar to Example 1, the XPS spectra of the positive electrode active material layers of Examples 2 to 9 and Comparative Examples 1 to 2 have peaks at 164 to 175 eV.

[0174] The inventors found that the peaks at 164 to 175 eV in the XPS spectra of the positive electrode active material layers of Examples 1 to 9 may be caused by the addition of additive A in the electrolyte.

[0175] In addition, from the comparison of Examples 1 to 9 and Comparative Examples 1 to 2, it can be seen that when the amount of e...

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Abstract

The invention provides an electrolyte and an electrochemical device. The electrochemical device comprises a positive electrode, a negative electrode, an electrolyte and an isolating membrane, whereinthe positive electrode comprises a positive electrode current collector and a positive electrode active material layer arranged on the positive electrode current collector, the X-ray photoelectron spectroscopy of the positive electrode active material layer has a peak in a range of 164 eV to 175 eV, and the electrolyte retention amount of the electrochemical device is 1.0 g / Ah to 4.0 g / Ah. According to the electrochemical device and the electrolyte, the cycle performance, the over-discharge storage performance and the safety performance of the electrochemical device can be improved.

Description

technical field [0001] The present application relates to the field of energy storage technology, in particular to an electrolyte and an electrochemical device containing the electrolyte. Background technique [0002] Electrochemical devices (such as lithium-ion batteries) have been widely used in new energy electric vehicles, electronic products such as cameras, digital cameras, and 3C products due to their high energy density, high operating voltage, long life, and environmental protection. Lithium-ion batteries are generally composed of positive electrodes, negative electrodes, separators and electrolytes. As an important component, the electrolyte plays a role in transferring lithium ions between the positive and negative electrodes, enabling the battery to obtain high energy, large rate, long cycle and An important guarantee for high security and other performance. [0003] The battery performance of lithium-ion batteries is easy to deteriorate at high temperatures, an...

Claims

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Application Information

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IPC IPC(8): H01M10/0525H01M4/131H01M4/485H01M4/505H01M4/525H01M10/0567
CPCH01M4/131H01M4/485H01M4/505H01M4/525H01M10/0525H01M10/0567Y02E60/10
Inventor 许艳艳徐春瑞郑建明
Owner NINGDE AMPEREX TECH
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