Rechargeable battery cell
A technology of rechargeable batteries and elements, applied in the field of rechargeable battery cells, can solve the problems of increased manufacturing cost, volume and weight of organic lithium ion batteries, and reduced energy density of organic lithium ion batteries, etc.
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preparation example Construction
[0101] During the preparation of the positive electrode 4, the LFPS is embedded in the porous structure of the discharge element in the manner described above, so as to fill its pores uniformly over the entire thickness of the metal structure. The material produced in this way is pressed under high pressure, and the thickness of the material after the pressing process is preferably at most 50%, particularly preferably at most 40%, of the original thickness.
[0102] The positive electrode 4 has a high load of active material and is therefore very thick. In this example, the load is about 14mAh / cm 2 , the thickness d is about 0.6mm.
[0103] image 3 Shown is an electron microscope image of the three-dimensional porous structure of metal foam 18 . On the basis of the specified ratio, it can be seen that the average diameter of the pores P is larger than 100 μm, ie relatively large.
[0104] The porous metal foam 18 of the discharge element extends substantially over the entir...
Embodiment 1
[0107] Example 1: An LFP electrode was produced as a comparative electrode.
[0108] The production of LFP electrodes is as follows:
[0109] First prepare the paste from the following components:
[0110] About 92-96% by weight of undoped lithium iron phosphate (LFP, LiFePO 4 )
[0111] About 0-4% by weight carbon black as conductive medium
[0112] About 2-6 wt% THV as binder
[0113] To do this, the adhesive is first dissolved in acetone solvent. Carbon black was then added to the solution with stirring. Finally, LFP and other solvents were also added alternately under stirring. The prepared paste was uniformly introduced into the metal foam with an initial porosity greater than 90%, and dried at 50 °C for 1 h. After cooling, starting from an initial thickness of 1.6 mm, the electrode material (i.e., LFP uniformly introduced into the metal foam) was pressed to a thickness of 0.5 mm by a calender. It is then tempered at 180°C. Punch out of this pressed and tempered ...
Embodiment 2
[0115] Embodiment 2: the production of LFPS electrode
[0116] LFPS electrodes were produced according to the method described in Example 1 for the production of LFP electrodes.
[0117] However, the paste is prepared using the following ingredients:
[0118] About 92-96% by weight sulfur-doped lithium iron phosphate (LFPS)
[0119] 0-4 wt% carbon black as conductive medium
[0120] About 2-6 wt% THV as binder
[0121] The described LFPS electrode with a theoretical capacity of 14 mAh was also examined in a half-cell with a three-electrode arrangement, where both the reference electrode and the counter electrode consisted of metallic lithium. The composition of the electrolyte used in the half-cell is LiAlCl 4 *1.5SO 2 .
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