Active material for rechargeable battery, rechargeable battery and electronic device
An active material and recharging technology, applied in battery/fuel cell control devices, active material electrodes, electrical devices, etc., can solve problems such as the reduction of battery characteristics, and achieve the effect of excellent battery characteristics
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Embodiment 1-1 to 1-12
[0270] Manufactured according to the following procedure Figure 13 and Figure 14 The laminated film type rechargeable battery shown in .
[0271] In the case of manufacturing the positive electrode 53, first, 91 parts by mass of the positive electrode active material (LiCoO 2 ), 6 parts by mass of a positive electrode conductive material (graphite), and 3 parts by mass of a positive electrode binder (polyvinylidene fluoride: PVDF) were mixed to form a positive electrode mixture. Subsequently, the cathode mixture was dispersed in an organic solvent (N-methyl-2-pyrrolidone: NMP) to form a paste cathode mixture slurry. Subsequently, the positive electrode active material layer 53B was formed by coating the positive electrode mixture slurry on both faces of the positive electrode current collector 53A (Al foil tape having a thickness of 12 μm) by using a coating device, followed by drying. Finally, the positive electrode active material layer 53B was compression-molded using ...
Embodiment 2-1 to 2-18
[0283] As shown in Table 2, except for the fact that a negative electrode active material of low crystallinity was used, rechargeable batteries were manufactured and various characteristics were examined following the same procedures as in Examples 1-6 and 1-8. In this case, the physical properties (average area occupancy and average particle diameter) of the negative electrode active material are controlled by adjusting the melting temperature of the raw material and the like.
[0284] Table 2
[0285]
[0286] Even when changing the negative active material (SiO z ), the same results as in Table 1 were also obtained. That is, when the atomic ratio of the surface is 30 atomic % to 75 atomic %, high initial efficiency and capacity retention are obtained, and with this, when a conductive layer is formed on the surface of the negative electrode active material, the initial efficiency and capacity retention further increase.
Embodiment 3-1 to 3-19
[0288] Except for the fact that the configuration of the negative electrode active material was changed, rechargeable batteries were manufactured and various characteristics were examined in the same procedure as in Examples 1-1 to 1-12.
[0289] In the case of manufacturing the negative electrode 54, first, a gas atomization method is used to obtain a highly crystalline core portion (SiO x Median diameter D50 = 4μm). In this case, by adjusting the O during the melting and solidification of the raw material (Si) 2 The amount introduced controls the composition (atomic ratio x). The physical properties of the core portion were width at half value = 0.6°, and grain size = 90 nm. Subsequently, an amorphous monolayer covering part (SiO y ). In this case, by adjusting the O during the deposition of the feedstock (Si) 2 or H 2 The amount introduced to control the composition (atomic ratio y). In the powder deposition method, the vapor deposition source is heated by resistance...
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