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Organic Schiff base polymer lithium ion battery negative electrode material, preparation method and application of polyimide structure
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A lithium-ion battery and polyimide technology, applied in battery electrodes, structural parts, secondary batteries, etc., can solve problems such as capacity reduction, and achieve the effects of increased rate performance, high reversible specific capacity, and cheap raw materials
Active Publication Date: 2021-07-23
JILIN UNIV
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However, the polymerization process usually introduces inactive groups, resulting in reduced capacity
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Embodiment 1
[0024] Under nitrogenatmosphere, weigh naphthalene-1,4,5,8-tetracarboxylic dianhydride (5g) and evenly disperse it in absolute ethanol (200mL), and heat to reflux under mechanical stirring; then slowly add hydrazine hydrate dropwise (5mL, volume percentage is 65%,), continue to heat and reflux for 2h, cool to room temperature; filter the mixture, and vacuum dry for 10h to obtain a tan solid, which is N,N'-diamino-1,4,5,8- Naphthalene tetracarboxylic diimidemonomer (yield 90%); then under nitrogenatmosphere, the N,N'-diamino-1,4,5,8-naphthalene tetracarboxylic diimide The iminemonomer (200mg, 0.68mmol) was heated to dissolve in 50mL of NMP solution, and then terephthalaldehyde (90.6mg, N,N'-diamino-1,4,5,8-naphthalene tetracarboxy The molar ratio of diimide to terephthalaldehyde is 1:1), under the condition of 210°C, continue to stir for 12h, and filter to obtain a brownish-yellow solid; Tetrahydrofuran was extracted for 24 hours, and vacuum-dried for 8 hours to obtain an ...
Embodiment 2
[0027] Under a nitrogenatmosphere, weigh naphthalene-1,4,5,8-tetracarboxylic dianhydride (8g) and evenly disperse it in absolute ethanol (300mL), and heat to reflux under mechanical stirring; then slowly add hydrazine hydrate dropwise (10mL, volume percentage is 65%), continue heating to reflux for 2h, and cool to room temperature; filter the mixture, and dry it in vacuum for 10h to obtain a tan solid, which is N,N'-diamino-1,4,5,8-naphthalene Tetracarboxylic diimide monomer; then under nitrogen atmosphere, the N,N'-diamino-1,4,5,8-naphthalene tetracarboxylic diimide monomer obtained by mechanical stirring (400mg, 1.35mmol ) in 100mL of NMP solution heated to dissolve, then dropwise added terephthalaldehyde (181.2mg), N,N'-diamino-1,4,5,8-naphthalene tetracarboxylic diimide monomer and p- The molar ratio of phthalaldehyde is 1:1; under the condition of 210°C, continue to stir for 12 hours, filter to obtain a brownish-yellow solid; put it in a Soxhlet extractor, extract it wit...
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Abstract
An organic Schiff basepolymerlithiumion negative electrode material with polyimide structure, a preparation method and its application as a negative electrode of a lithiumion battery belong to the technical field of lithiumion battery materials. The present invention adopts the naphthalene ring and the Schiff base as the polymer connecting skeleton, avoids the introduction of inactive fragments, and has a more extended conjugated structure at the same time. Compared with the existing organic negative electrode materials, the polyimide structure organic Schiff basepolymer lithium ion negative electrode material (NBI-PI) prepared by the present invention has the advantage that while maintaining a higher reversible specific capacity, the The rate performance under high current density has been significantly improved. The anode material greatly improves the stability of the battery during cycling, and at the same time has high rate performance and moderate reversible specific capacity, and is simple in synthesis and low in production cost. It is suitable for large-scale applications. large-scale industrial production.
Description
technical field [0001] The invention belongs to the technical field of lithium-ion battery materials, and in particular relates to an organic Schiff-base polymer lithium-ion negative electrode material with a polyimide structure, a preparation method and its application in lithium-ion battery negative electrodes. Background technique [0002] Energy and environmental issues are the two most important challenges facing human society in the 21st century. In order to meet these challenges, lithium secondary battery technology has emerged as the times require. Lithium-ion batteries (LIBs) are the most widely researched and applied, and have been widely used in electronic devices such as notebook computers and mobile phones. As applications such as large-scale energy storage and electric vehicles have higher and higher performance requirements for lithium batteries, current commercial lithium-ion batteries can no longer meet the corresponding requirements. Therefore, research a...
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