Anode material for lithium ion rechargeable battery, anode for lithium ion rechargeable battery, and lithium ion rechargeable battery
A technology of secondary battery and negative electrode material, applied in the direction of secondary battery, battery electrode, negative electrode, etc., can solve the problems of reduced cycle characteristics, depletion of electrolyte, stretching, etc., to achieve miniaturization and high performance, and good battery performance , the effect of excellent permeability
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Embodiment 1）
[0185] [Preparation of Mesophase Spherical Graphite (A)]
[0186] Coal tar pitch was heat-treated at 450°C for 90 minutes in an inert atmosphere to generate mesophase spheres at 35% by mass in the pitch matrix. Thereafter, mesophase spheres were extracted using tar medium oil, separated by filtration, and dried at 120° C. in a nitrogen atmosphere. This was heat-treated at 600° C. for 3 hours in a nitrogen atmosphere to prepare a calcined mesophase sphere.
[0187] Next, after immersing the calcined product in an aqueous solution of ferrous chloride, the water was removed while stirring, and dried to attach 5% by mass of ferrous chloride to the surface of the calcined mesophase spheres.
[0188] Fill the calcined mesophase spheres with ferrous chloride attached into a graphite crucible, heat at 3150°C for 5 hours in a non-oxidizing atmosphere, and perform graphitization treatment to prepare mesophase spheres (A) . No iron compound is contained in this graphitized substance (...
Embodiment 1
[0229] In Example 1, the mass proportions of the mesophase small spherical graphitized product (A), roughly spherical natural graphite (B), flaky graphite (C) and non-granulated graphite (D1) were changed as shown in Table 1, In addition, the density of the negative electrode mixture layer was adjusted to 1.75 g / cm in the same manner as in Example 1. 3 Then, a working electrode was produced, and an evaluation cell was produced. The same charge and discharge test as in Example 1 was performed, and the evaluation results of battery characteristics are shown in Table 1.
[0230] When the working electrode is made by adding the negative electrode material in the mass ratio specified in the present invention, the density of the negative electrode mixture layer can be increased, and the discharge capacity, initial charge and discharge efficiency, rapid charge rate, rapid discharge rate, and cycle characteristics are all excellent.
Embodiment 6）
[0232] [Preparation of flaky graphite (C1) with carbonaceous material attached]
[0233] To 100 parts by mass of flaky natural graphite used in Example 1, 3 parts by mass of mesophase pitch powder (average particle diameter 2 μm) with a softening point of 150° C. and Ketjen Black (average particle diameter 30 nm) with a softening point of 150° C. were mixed. ) 0.1 parts by mass, put into the "Mechanofusion system" (manufactured by HOSOKAWA MICRON Co., Ltd.), and repeatedly apply compression under the conditions of the peripheral speed of the drum 20m / s, the treatment time 60 minutes, and the distance between the drum and internal parts 5mm Force, shear force, mechanochemical treatment. The obtained sample was filled in a graphite crucible, and fired at 1200° C. for 3 hours in a non-oxidizing atmosphere. The obtained flaky graphite had carbides adhered to the surface.
[0234] In Example 1, except that the flaky graphite (C) was changed to the flaky graphite (C1) obtained abo...
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