Cathode material for lithium ion secondary battery, producing method thereof, and lithium ion secondary battery
A secondary battery and negative electrode material technology, applied in the direction of electrode manufacturing, secondary batteries, battery electrodes, etc., can solve the problems of reduced charge and discharge capacity, inability to flow large currents, etc., and achieve improved conductivity and high charge and discharge capacity Effect
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[0083] Next, for the negative electrode material for lithium ion secondary battery of the present invention, its manufacturing method, and lithium ion secondary battery, the embodiment that satisfies the requirement of the present invention is compared with the comparative example that does not satisfy the requirement of the present invention. Be specific.
no. 1 example
[0085] Samples were produced by the following method.
[0086] in such as figure 2 In the chamber of the shown sputtering device, a carbon target of φ100 mm×thickness 5 mm, a tin target (manufactured by High Purity Chemical Co., Ltd.: purity 99.99%), and a zirconium target (manufactured by High Purity Chemical Co., Ltd.: purity 99.2%) are installed. , and set a copper foil (manufactured by nilaco Co., Ltd.) with a length of 50×width 50×thickness 0.02mm on the substrate table in a manner facing the carbon target, tin target, and zirconium target, and the pressure in the chamber is 1×10 -3 Vacuum the way below pa, so that the chamber is in a vacuum state. Thereafter, Ar gas was introduced into the chamber to make the pressure in the chamber 0.26Pa, DC (direct current) was applied to the carbon target, tin target, and zirconium target to generate plasma, and the carbon target, tin target, and zirconium target were sputtered. . In this way, a film in which tin and zirconium ca...
no. 2 example
[0101] Similar to the first embodiment, a sputtering device is used to form a negative electrode material. However, the zirconium target was changed to a target material of other 4A, 5A, and 6A group elements, and film formation was performed. The results are shown in Table 2.
[0102] 【Table 2】
[0103]
[0104] As shown in Table 2, by adding group 4A, 5A, and 6A elements, even at a charge-discharge rate of 10C, it was possible to exhibit an initial discharge capacity equivalent to that of a charge-discharge rate of 0.2C. In addition, it can be seen that by adding Sn, the initial discharge capacity can be made higher than that of Comparative Example 4, and that by adjusting Sn within the range of the present invention, the cycle characteristics are also good.
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