Anode active material for secondary battery, anode comprising same, and method for manufacturing same
A negative electrode active material and secondary battery technology, applied in the direction of secondary batteries, battery electrodes, active material electrodes, etc., can solve the problems of cycle expansion and poor fast charging performance, shortened cycle life, electrode expansion, etc., to achieve rapid cycle expansion performance, uniform particle size distribution, and fast charging effects
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Embodiment 1
[0113] Preparation of negative electrode
[0114] Preparation of spherical natural graphite (specific surface area: 2.5 m) graphitized by heating at 3000° C. for 10 hours 2 / g, tap density: 1.21 g / cc). Subsequently, petroleum-based pitch and natural graphite were mixed at a weight ratio of 5:95, placed in a calciner, and heat-treated at a temperature of about 1200° C. for 8 hours to coat the natural graphite with amorphous carbon. At this time, the amorphous carbon coating was about 4% by weight with respect to the entire coated natural graphite particles, and the average particle diameter of the coated natural graphite particles (D 50 ) is about 12 μm.
[0115] Classification of natural graphite to remove fine and coarse powders such that D max / D min The value is 1.8. After that, the natural graphite was mixed with a 1M potassium hydroxide solution and left at 1400° C. for 6 hours, followed by surface treatment, and then the surface-treated natural graphite was washed. ...
Embodiment 2
[0122] Preparation of negative electrode
[0123] Graphite heat treatment and coating of amorphous carbon on spherical natural graphite were carried out in the same manner as in Example 1 to prepare particles having an average particle diameter of about 12 μm (D 50 ) and an amorphous carbon coating ratio of about 4% by weight of natural graphite. By classifying natural graphite, fine and coarse powders are removed. Subsequently, the natural graphite was surface-treated with KOH in the same manner as in Example 1, and an annealing process was performed. As a result, an active material made of natural graphite was prepared in which D max / D min The value was 1.8, pores with a size of 1 μm were formed on the surface, and 5 vol% of pores with a size of 6 nm or less and 80 vol% of pores with a size of 60 nm to 200 nm were formed therein.
[0124] Natural graphite used as negative electrode active material, SuperC65 used as conductive material, styrene butadiene rubber (SBR) used ...
Embodiment 3
[0129] Graphite heat treatment and coating of amorphous carbon on spherical natural graphite were carried out in the same manner as in Example 1 to prepare particles having an average particle diameter of about 12 μm (D 50 ) and an amorphous carbon coating ratio of about 4% by weight of natural graphite. By classifying natural graphite, fine and coarse powders are removed. Subsequently, the natural graphite was surface-treated with KOH in the same manner as in Example 1, but without the annealing process. As a result, a negative electrode active material made of natural graphite was prepared in which D max / D min The value was 2.0, pores with a size of 1 μm were formed on the surface, and 15 vol% of pores with a size of 6 nm or less and 60 vol% of pores with a size of 60 nm to 200 nm were formed therein.
[0130] Furthermore, batteries (a coin-type full cell and a half-cell type) were prepared in the same manner as in Example 1 using the negative electrode active material. ...
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Abstract
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