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Electrochemical device and electronic device

An electrochemical and discharge capacity technology, applied in the field of electrochemical energy storage, can solve problems such as unsatisfactory

Pending Publication Date: 2022-06-03
NINGDE AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

At present, in order to improve the low-temperature charge-discharge performance of electrochemical devices, although some measures have been taken and some improvements have been made, they are still not satisfactory.

Method used

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  • Electrochemical device and electronic device
  • Electrochemical device and electronic device
  • Electrochemical device and electronic device

Examples

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Embodiment 1

[0072] Preparation of positive electrode: Lithium cobaltate, conductive carbon black (Super P), and polyvinylidene fluoride (PVDF) were mixed in a weight ratio of 97.5:1.0:1.5, and N-methylpyrrolidone (NMP) was added as a solvent, and stirred evenly . The slurry is uniformly coated on the positive electrode current collector aluminum foil with a coating thickness of 80 μm, and the positive electrode is obtained after drying, cold pressing and cutting.

[0073] Preparation of negative electrode: dissolving epoxy resin in ethanol and stirring for a period of time to obtain a mixed solution, then adding a curing agent (m-phenylenediamine) (epoxy resin: curing agent mass ratio = 10:1) and transferring the mixed solution to a hydrothermal reaction In the kettle, the hydrothermal reaction was carried out under the condition of 180°C, and the solid part was taken out after the temperature was cooled down. It was placed in a box furnace, heated to 200°C for 1 h at 5°C / min under nitro...

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Abstract

Provided are an electrochemical device and an electronic device wherein the 0.2 C discharge capacity of the electrochemical device at-20 DEG C is A, the 0.2 C discharge capacity of the electrochemical device at 25 DEG C is B, and 70% < = A / B < = 90%. The electrochemical device provided by the embodiment of the invention has relatively good low-temperature charge-discharge performance at a low temperature of-20 DEG C.

Description

technical field [0001] The present application relates to the field of electrochemical energy storage, in particular to electrochemical devices and electronic devices. Background technique [0002] With the development and progress of electrochemical devices (eg, lithium-ion batteries), higher and higher requirements have been placed on their low-temperature charge-discharge performance. At present, in order to improve the low-temperature charge-discharge performance of electrochemical devices, although some measures have been taken to obtain some improvements, they are still unsatisfactory. [0003] Therefore, improving the low-temperature charge-discharge performance of electrochemical devices is still an urgent problem to be solved. SUMMARY OF THE INVENTION [0004] Some embodiments of the present application provide an electrochemical device, the 0.2C discharge capacity of the electrochemical device at -20°C is A, the 0.2C discharge capacity of the electrochemical dev...

Claims

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Application Information

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IPC IPC(8): H01M10/0525H01M4/13H01M4/64
CPCH01M10/0525H01M4/13H01M4/64Y02E60/10
Inventor 刘茜郑席杜鹏谢远森
Owner NINGDE AMPEREX TECH
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