Negative active material for lithium secondary battery and negative electrode and lithium secondary battery comprising same
A negative electrode active material, lithium secondary battery technology, applied in the direction of active material electrodes, secondary batteries, battery electrodes, etc., can solve the problems of reversible intercalation difficulties, degradation of battery cycle life, and degradation of discharge characteristics
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Embodiment 1
[0048] Flake graphite powder particles with an average diameter of 30 μm were introduced into a pin mill and pre-ground. Protruding portions and edge portions of flake graphite powder particles are removed to form aggregates having a spherical or pseudo-spherical shape. The resulting flake graphite powder particles are then introduced into a mechanical melting process and further ground. The flaky graphite powder particles are oriented in the plane direction and laminated, and then the fine graphite powder particles are placed on the surface of the flaky graphite powder particles, thereby obtaining a second aggregated carbon material heat-treated at 1000°C.
[0049] The obtained negative electrode active material was mixed with 6 parts by weight of polyvinylidene fluoride (PVdF) as a binder, and dispersed in N-methylpyrrolidone, thereby preparing a negative electrode slurry. The slurry was coated on a copper current collector and pressed with a roll press to produce The nega...
Embodiment 2
[0052] A battery was prepared in the same manner as in Example 1, except that the second aggregate was obtained by adding 10 parts by weight of mesophase pitch based on 100 parts by weight of the aggregate obtained in Example 1.
Embodiment 4
[0066] 94 parts by weight of LiCoO as the positive electrode active material 2, 2 parts by weight of polyvinylidene fluoride (PVdF) as a binder, and 4 parts by weight of a super-P conductive agent were mixed, and the positive electrode slurry was prepared by dispersing the mixture into N-methylpyrrolidone. The slurry was applied onto an aluminum foil and compressed with a roll press, thereby preparing a positive electrode having an active body (active material layer) density of 3.4 g / cc.
[0067] A polyethylene separator was put between the positive electrode prepared above and the negative electrode prepared in Example 1 having an electrode plate density of 1.60 g / cc to constitute an electrode group. The prepared electrode group is coiled and pressurized, and then put into a battery case. Electrolyte is injected into the case to form a battery. A mixed solution of 1.0 M LiPF6 dissolved in ethylene carbonate, dimethyl carbonate and ethylmethyl carbonate (volume ratio 3:3:4) ...
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Abstract
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