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A lithium-ion battery and additive technology, applied in secondary batteries, circuits, electrical components, etc., to achieve the effect of increasing the rate and improving the resistance to overcharge
Active Publication Date: 2016-03-23
ZHEJIANG NARADA POWER SOURCE CO LTD +1
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[0005] The purpose of the present invention is to improve a lithium-ion battery containing additives to improve the battery cathode interface and the existence of cathode materials, thereby improving the comprehensive performance of lithium-ion batteries such as electrochemical and safety
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Embodiment 1
[0022] Dissolve N,N-carbonyldiimidazole (CDI) with a purity of 99% in DEC to make a 10% N,N-carbonyldiimidazole (CDI) solution, and then add N,N - Carbonyldiimidazole (CDI) solution is added to lithium-ion battery reference electrolyte to make N,N-carbonyldiimidazole (CDI) electrolyte.
[0023] The cathode sheet, diaphragm, and anode sheet are laminated into a soft-pack battery, in which the cathode active material is nickel-cobalt lithium manganese oxide, the anode active material is artificial graphite, and the reference electrolyte is LiPF 6 (1.0mol / L) dissolved in a mixed solvent of EC, DEC and EMC with a weight ratio of 1:1:1. The size of the battery is 8.0mm×65mm×135mm, and the design capacity is 1 / 3C=7000mAh. Fill the pouch battery with N,N-carbonyldiimidazole (CDI) electrolyte according to the normal process.
Embodiment 2
[0025] Dissolve N,N-carbonyldiimidazole (CDI) with a purity of 98% in the cathode process solvent N-methylpyrrolidone (NMP), and the addition amount is 3% of the cathode material, and then the cathode binder polyvinylidene fluoride (PVDF) is dissolved in it to make a cathode colloid, and then the conductive agent and cathode active material nickel cobalt lithium manganate are dispersed in the cathode colloid, and the cathode sheet is made by coating and drying, N,N-carbonyldiimidazole (CDI) evenly distributed in the cathode.
[0026] Laminate the cathode sheet, separator, and anode sheet with N,N-carbonyldiimidazole (CDI) into a soft-packed lithium-ion battery. The manufacturing process of the anode sheet and the battery is the same as in Example 1, and the battery is filled with the benchmark electrolysis of Example 1. liquid.
Embodiment 3
[0028] The implementation process is exactly the same as in Example 1, except that N,N-carbonyldiimidazole (CDI) is replaced by its derivative N,N-carbonyldiimidazole quaternary ammonium salt (CDI quaternary ammonium salt), the purity is 98%, And the addition amount of CDI quaternary ammonium salt is 3%.
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Abstract
The invention provides a lithium ion battery containing additives. The lithium ion battery is characterized in that the lithium ion battery contains organic additives, and the additives mainly act on a lithium ion negative electrode or a negative electrode process; the organic additives are at least two selected from N,N-carbonyl diimidazole (CDI) or derivatives of N,N-carbonyl diimidazole, or at least two selected from N,N-carbonyl diimidazole (CDI) and derivatives of N,N-carbonyl diimidazole (CDI). The addition amount is 0.01%-5% of a battery adding electrolyte or a negative electrode material. The usage method is as follows: N,N-carbonyl diimidazole (CDI) and derivatives of N,N-carbonyl diimidazole (CDI) are dissolved in a lithium ion battery electrolyte solvent, then mixed dissolving in the lithium ion battery electrolyte or respective addition of the lithium ion battery electrolyte is carried out, or N,N-carbonyl diimidazole (CDI) or derivatives of N,N-carbonyl diimidazole (CDI) is dissolved in a solvent of the negative electrode process of the lithium ion battery, and then the additive is distributed in the battery negative electrode uniformly along with the negative electrode substance. The additive can raise the electric performances and safety performances of the lithium ion battery greatly.
Description
technical field [0001] The invention relates to a lithium ion battery, in particular to an additive-containing lithium ion battery. Background technique [0002] Additives, as small amounts of non-energy storage materials used in chemical power sources, can significantly improve certain properties of batteries. Throughout the development of chemical power sources, additives are more or less required for any power system technology to mature. Power additives have the characteristics of strong pertinence, low dosage and side effects, and can significantly improve certain macroscopic properties of batteries without increasing or basically increasing production costs, without changing the original material system structure, and without changing the production process. Including battery capacity, positive and negative electrode matching performance, rate charge and discharge performance, high and low temperature performance, cycle performance or safety performance, etc. With th...
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