Lithium secondary battery-use electrode and lithium secondary battery
A lithium battery, recharging technology, applied in the direction of battery electrodes, lithium batteries, electrode carriers/collectors, etc., can solve the problem of not being able to obtain cycle characteristics
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Embodiment 1
[0065] (manufacturing of electrodes)
[0066] After electroplating, a 2 micron thick tin layer was deposited on an 18 micron thick electrolytic copper foil (surface roughness = 0.188 micron). Tin was used as the positive electrode. The plating baths used contained the composition indicated in the table below.
[0067] Element
concentration
tin sulfate
40g·dm -3 (g / dm 3 )
sulfuric acid
150g·dm -3 (g / dm 3 )
Formaldehyde solution
5cm 3 · dm -3 (cm 3 / dm 3 )
Additives
(Product of UYEMURA & Co., Ltd.)
40cm 3 · dm -3 (cm 3 / dm 3 )
[0068] After the deposition of the tin layer, the resulting laminate was cut into a size of 2 cm x 2 cm, and then heat-treated at 200 degrees Celsius for 24 hours to obtain an electrode a1.
[0069] For comparison purposes, the above-described process was repeated except that no heat treatment was performed to fabricate the electrode b1.
[0070] Fig. 1 is a...
Embodiment 2
[0093] (making electrodes)
[0094] Similar to that used in Example 1, a 2 micron thick tin-lead alloy layer was deposited on the electrolytic copper foil by an electrolytic plating process. The tin-lead alloy layer serves as the positive electrode. A plating bath similar to that used in Example 1 was used.
[0095] After depositing the tin-lead layer, the resulting laminate was cut into a size of 2 cm x 2 cm, and then heat-treated at 200 degrees Celsius for 24 hours to obtain electrode c1.
[0096] Similar to Example 1, the fabricated electrode c1 was observed with a scanning electron microscope, a scanning ion microscope and an X-ray microanalyzer (XMA). The results confirmed that a mixed layer of copper, tin and lead was formed at the interface between the copper substrate and the tin-lead alloy layer.
[0097] (Measurement Cycle Characteristics)
[0098] The electrode c1 was used as a working electrode, and a beaker cell was constituted in a similar manner to Example 1...
Embodiment 3
[0100] The electrodes a1 and b1 obtained in Example 1 and the electrode c1 obtained in Example 2 were used to constitute rechargeable lithium batteries with their own negative electrodes, respectively, and then the charge-discharge cycle characteristics were evaluated.
[0101] (Making positive electrode)
[0102] Calculate by weight (by weight) 85% of LiCoO with an average practical diameter of 10 microns 2 powder, 10% of carbon powder used as an electrically conductive medium and 5% of polyvinyl difluoride powder were mixed. After additional addition of N-methylpyrroline, the mixture was stirred to become a slurry. The slurry was coated on one surface of a 20 micron thick aluminum foil using doctor blade technique and allowed to dry. A 2 cm x 2 cm piece was cut out from the coated aluminum foil to make a positive electrode.
[0103] (making batteries)
[0104] The above-made positive electrode and electrode a1, b1 or c1 are combined through a polyethylene microporous sep...
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