Electrochemical device and electronic device including same

An electrochemical and electrolyte technology, applied in the field of energy storage, can solve the problems of reduced cycle performance and charge-discharge performance, unable to achieve the overall improvement of lithium-ion battery performance, and increased instability of the electrolyte and positive active material interface.

An electrochemical and electrolyte technology, applied in the field of energy storage, can solve the problems of reduced cycle performance and charge-discharge performance, unable to achieve the overall improvement of lithium-ion battery performance, and increased instability of the electrolyte and positive active material interface.

CN111416152AActive Publication Date: 2020-07-14NINGDE AMPEREX TECH
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  • Electrochemical device and electronic device including same
  • Electrochemical device and electronic device including same
  • Electrochemical device and electronic device including same

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Embodiment Construction

[0025] Embodiments of the present application will be described in detail below. Throughout the specification of the present application, the same or similar components and components having the same or similar functions are denoted by like reference numerals. The embodiments described herein with respect to the accompanying drawings are illustrative, diagrammatic and are used to provide a basic understanding of the application. The examples of the present application should not be construed as limiting the present application.

[0026] As used herein, the terms "approximately," "substantially," "substantially," and "about" are used to describe and account for minor variations. When used in conjunction with an event or circumstance, the terms can refer to instances in which the event or circumstance occurred exactly as well as instances in which the event or circumstance occurred with close approximation. For example, when used in connection with a numerical value, the term ...

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Abstract

The invention relates to an electrochemical device and an electronic device comprising the same. The electrochemical device comprises a positive electrode, a negative electrode, an isolating membraneand an electrolyte, wherein the electrolyte contains a nitrile compound and transition metal ions, and satisfies 5 < = A / B < = 30,000, the molar percentage of cyano groups in the electrolyte is A% based on the molar weight of the electrolyte, and the weight percentage of the transition metal ions in the electrolyte is B% based on the weight of the electrolyte. The electrochemical device reduces dissolution of transition metal ions of the positive electrode active substance and stabilizes structural distortion of the positive electrode active substance in the charging and discharging process bydetermining that cyano groups and the transition metal ions in the electrolyte meet a certain relationship, so that the high-temperature cycle performance and the floating charge performance of the electrochemical device are improved.

Description

technical field [0001] The present application relates to the technical field of energy storage, in particular to an electrochemical device and an electronic device including the same. Background technique [0002] Electrochemical devices (e.g., lithium-ion batteries) are widely used in wearable devices, smartphones, drones, laptops, and other fields due to their high operating voltage, high energy density, environmental friendliness, stable cycle, and safety. With the development of modern information technology and the expansion of lithium-ion battery applications, higher requirements are put forward for lithium-ion batteries, namely high energy density, long cycle life and excellent storage characteristics. The interaction between the electrolyte and the positive and negative electrodes will affect these properties, especially when the working voltage is increased to 4.4V to improve the energy density of the lithium-ion battery, the instability of the interface between th...

Claims

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Application Information

Patent Timeline
14 Jul 2020
Publication
CN111416152A
IPC
H01M10/0567; H01M10/0525
CPC
H01M10/0525; H01M10/0567; Y02E60/10; H01M4/463; H01M4/525; H01M10/44
Inventors
崔辉; 栗文强