Negative electrode active material and battery
A negative electrode active material and silicon-based material technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as capacity decay, active material powdering and falling off, lower battery efficiency and cycle performance, etc., to inhibit expansion and increase Conductivity, the effect of improving the first Coulombic efficiency and cycle performance
Active Publication Date: 2021-03-02
CONTEMPORARY AMPEREX TECH CO
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Problems solved by technology
However, silicon-based materials will have a huge volume expansion (about 400%) during the cycle, resulting in the pulverization and shedding of the active material during the charge and discharge process, severe capacity fading, reducing the efficiency and cycle performance of the battery, and There are serious security risks
Method used
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Embodiment 1
[0040] (1) Preparation of positive pole piece: a circular lithium piece is used.
[0041] (2) Negative electrode sheet preparation: fully dissolve 10wt% aqueous carboxymethylcellulose binder in water, add 10wt% carbon black conductive agent and 80wt% negative electrode active material prepared above to make a uniformly dispersed slurry. Spread the slurry evenly on the surface of the copper foil, then transfer to a vacuum drying oven to dry completely. The obtained pole piece is rolled and then punched to obtain a disc with the same size as the lithium piece. Among them, the selected negative electrode active material contains Ti 5 Si 3 phase, and the average particle size Dv50 of the negative electrode active material is 8 μm.
[0042] (3) Isolation membrane: Celgard isolation membrane is used.
[0043] (4) Electrolyte: Mix ethylene carbonate (EC), ethyl methyl carbonate (EMC), and diethyl carbonate (DEC) in a volume ratio of 1:1:1 to obtain an organic solvent, and then fu...
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Abstract
The present application relates to a negative electrode active material comprising a core structure, a first cladding layer covering at least a part of the surface of the core structure, and a second cladding layer covering at least a part of the surface of the first cladding layer A cladding layer, the core structure includes a silicon-based material, the first cladding layer includes titanium element, the second cladding layer includes a polymer, and the negative electrode active material is in the X-ray with CuKα ray as the radiation source Ti was detected in ray diffraction tests 5 Si 3 Mutually. The negative electrode active material of the present application has a double-layer coating structure and contains a specific phase state, which can effectively improve the first Coulomb efficiency and cycle performance of the silicon-based negative electrode active material.
Description
technical field [0001] The present application relates to the technical field of secondary batteries, in particular to a negative electrode active material and a battery. Background technique [0002] With the increasingly prominent energy and environmental issues, the new energy industry has received more and more attention. Due to its high energy density and good cycle performance, secondary batteries have been widely used as an important new energy storage device in recent years. At present, the negative electrode active material of the commercialized secondary battery is mainly graphite. Due to the low theoretical lithium intercalation capacity of graphite itself, which is only 372mAh / g, and it is difficult to improve the energy density only by improving the battery design structure and manufacturing process. Its application in fields requiring high energy output is limited, so anode active materials with higher specific energy are required. [0003] In recent years, n...
Claims
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IPC IPC(8): H01M4/36H01M4/38H01M4/48H01M4/58H01M4/62H01M10/0525
CPCH01M4/366H01M4/386H01M4/483H01M4/58H01M4/624H01M4/628H01M10/0525Y02E60/10
Inventor 曾毓群梁成都温严刘欣官英杰李铖黄起森
Owner CONTEMPORARY AMPEREX TECH CO