Electrochemical device and electronic device
An electrochemical and positive electrode active material technology, which is applied in the field of electrochemical devices and electronic devices, can solve the problems of negative electrode active material layer release, reduce the cycle performance of electrochemical devices, and pulverization, so as to reduce volume expansion and prevent unfavorable Affects and improves cycle performance
Active Publication Date: 2021-09-07
DONGGUAN AMPEREX TECH +1
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Problems solved by technology
At present, in order to increase the energy density of electrochemical devices, some negative electrode active materials with high gram capacity (for example, silicon-based materials) are usually used. However, the negative electrode active materials with high gram capacity are accompanied by significant volume expansion as the cycle progresses, Causes problems such as stripping and pulverization of the negative electrode active material layer, reducing the cycle performance of the electrochemical device
Method used
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Embodiment 1
[0048] Preparation of the positive pole piece: Aluminum foil is used as the positive current collector, and the positive active material lithium cobaltate (gram capacity is 176mAh / g), the conductive carbon black of the conductive agent, and the binder polyacrylic acid are used in a weight ratio of 97.6:1.1:1.3. Dissolved in N-methylpyrrolidone (NMP) solution to form a positive electrode slurry, the positive electrode slurry is coated on the positive electrode current collector, after drying, cold pressing, and cutting, the surface is provided with a mass per unit area of 19.865mg / cm 2 The positive electrode sheet of the positive electrode active material layer. The compacted density of the positive electrode sheet in the cold pressing process is 4.15g / cm 3 .
[0049] Preparation of negative electrode sheet: SiO2 (gram capacity: 1545mAh / g), acrylic resin, conductive carbon black, single-walled carbon nanotubes and sodium carboxymethyl cellulose in a weight ratio of 88.3:9:...
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Abstract
The invention provides an electrochemical device and an electronic device. The electrochemical device comprises a positive pole piece, a negative pole piece and an isolating membrane arranged between the positive pole piece and the negative pole piece. The positive pole piece comprises a positive current collector and a positive active material layer arranged on the positive current collector, the positive active material layer comprises a positive active material, and the positive active material comprises lithium cobalt oxide. The negative pole piece comprises a negative current collector and a negative active material layer arranged on the negative current collector, and the negative active material layer comprises a negative active material. The electrochemical device satisfies the following relational expressions: 3 <= 100 * (4.5-U)-10 * (CB-1) < = 10, CB = (A '* B' * C ') / (A * B * C). According to the embodiment of the invention, the CB of the electrochemical device is improved, the charging cut-off voltage U is reduced, the volume expansion of the negative electrode active material layer in the charging and discharging process is reduced, the negative influence of the improvement of the positive electrode potential on the positive electrode active material is prevented, and the cycle performance of the electrochemical device is improved.
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 are placed on their cycle performance and energy density. At present, in order to increase the energy density of electrochemical devices, some negative electrode active materials with high gram capacity (for example, silicon-based materials) are usually used. However, the negative electrode active materials with high gram capacity are accompanied by significant volume expansion as the cycle progresses, It causes problems such as stripping and pulverization of the negative electrode active material layer, and reduces the cycle performance of the electrochemical device. [0003] Therefore, how to improve the cycle performance of the electrochemical device while e...
Claims
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IPC IPC(8): H01M4/525H01M4/48H01M4/38H01M4/62H01M10/0525H01M10/058
CPCH01M4/525H01M4/483H01M4/386H01M4/625H01M10/0525H01M10/058H01M2010/4292Y02E60/10H01M4/0404H01M4/131H01M4/366H01M4/505H01M4/621H01M4/661H01M2004/027H01M2004/028
Inventor 王强
Owner DONGGUAN AMPEREX TECH