Lithium-containing diaphragm, lithium battery cell, lithium battery and preparation methods of lithium-containing diaphragm, lithium battery cell and lithium battery
A lithium battery and diaphragm technology, applied in the field of electrochemical energy storage, can solve the problems of reducing energy density, excessive lithium supplementation, and increasing battery cost, and achieve the effects of reducing unnecessary lithium, simple process, and improving charge and discharge efficiency
Pending Publication Date: 2020-06-19
CHINA ENERGY CAS TECH CO LTD
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Problems solved by technology
Use lithium sheet to supplement lithium, because lithium sheet is difficult to make thin, it will supplement lithium excessively, but the lithium ions from the positive electrode have nowhere to go, but will reduce the energy density (for example, the surface density of the negative electrode is 5mAh / cm 2 , the first efficiency is 95%, and the thickness of the lithium foil needs to be only 1 micron, which is still difficult to achieve at present)
Lithium-silicon alloy and SLMP are used as lithium sources for lithium supplementation. Lithium-silicon alloy and SLMP are relatively active and will react with the solvent (N-methylpyrrolidone or water) used in the negative electrode mixing slurry. Therefore, it is necessary to change the mixing process of the existing lithium battery. , develop new mixing solvents and processes, increase battery costs
Method used
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Embodiment 1
[0114] 1. List of materials
[0115] 1.1 Diaphragm
[0116] Polypropylene diaphragm (Shenzhen Biyuan Electronics Co., Ltd.)
[0117] Width: 60mm
[0118] Thickness: 40μm
[0119] 1.2 Reticle
[0120] Stainless steel mask, structured as Figure 8 shown.
[0121] 2. Evaporated lithium plating conditions
[0122] The lithium-containing diaphragm was prepared by vacuum evaporation method, and the evaporation parameters were set: the degree of vacuum was 10 -5 Pa, the temperature is 550°C, and the evaporation time is 1.5 hours. The mask plate is covered on the surface of the diaphragm, and transferred to a vacuum evaporation chamber for lithium plating. Figure 9 The electron microscope image of the cross-section of the obtained lithium-containing separator shows that the thickness of the lithium layer is about 25 microns. Transfer the lithium-plated separator to a dry room (dew point -45°C), and assemble the pouch battery.
[0123] 3. Preparation of positive and negative...
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Abstract
The invention discloses a lithium-containing diaphragm, a lithium battery cell, a lithium battery and preparation methods of the lithium-containing diaphragm and the lithium battery cell. The lithium-containing diaphragm according to the present invention comprises: a diaphragm in the form of a web, and one or more lithium-containing regions distributed on one surface of the diaphragm along the length direction of the web, wherein in the length direction of the web, the length of the diaphragm is greater than or equal to the length of the lithium-containing region, and in the width direction of the web, the width of the separator is greater than the width of the lithium-containing region, and the thickness of the lithium-containing region is 0.1-100 [mu]m, preferably 0.1-30 [mu]m.
Description
technical field [0001] The invention relates to the technical field of electrochemical energy storage, in particular to lithium-containing diaphragms for lithium batteries, corresponding lithium battery cells, lithium batteries and their preparation methods. Background technique [0002] Lithium batteries are widely used in consumer electronics, electric vehicles, and energy storage because of their high specific energy, long cycle life, and high voltage. In recent years, with the continuous technological breakthroughs in lithium battery applications such as electric vehicles, energy storage base stations, and digital equipment, deeper and higher requirements have been put forward for lithium batteries. Existing lithium-ion batteries are far from meeting the above requirements. development needs of the field. [0003] The carbon negative electrode and silicon negative electrode materials used in existing lithium-ion batteries will form a solid electrolyte layer (SEI layer) ...
Claims
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Patent Timeline
Login to View More IPC IPC(8): H01M2/14H01M2/16H01M10/0587H01M10/0585
CPCH01M10/0585H01M10/0587H01M50/403H01M50/449Y02E60/10Y02P70/50
Inventor 刘承浩王亚龙陈强牟瀚波
Owner CHINA ENERGY CAS TECH CO LTD