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Qingdao Energy Has Made Progress In The Field Of The Next Generation Of High-energy Lithium Battery Electrolytes And Adhesives

- Dec 10, 2018 -

Market and consumer range of electric vehicles and portable electronic products of high attention, drive the continuous increase of lithium ion battery energy density increase lithium ion battery energy density is the most common strategy is to develop a new type of high voltage and high capacity anode material (such as high voltage cobalt acid lithium nickel manganese acid lithium high voltage ternary material, etc.) or high capacity anode materials (such as silicon carbide materials), however, these new type of electrode materials and electrolyte traditional adhesives compatibility is poor, it is difficult to form a stable interface, become the commercialization process of the next generation of high-energy lithium-ion batteries, one of the bottlenecksRelying on the institute of bioenergy and process of the Chinese academy of sciences, Qingdao institute of energy storage industry and technology takes the research of the next generation of high-energy lithium ion battery and its supporting electrolyte and binder as one of the main research fields

As is known to all, is the lifeblood of the lithium ion battery electrolyte, the development of high performance liquid electrolyte and the electrode/electrolyte interface formation mechanism research will greatly improve the performance of the next generation of high-energy lithium-ion batteries by western medicine and traditional Chinese medicine prescription and drug combination inspired ideas, in-depth development of Qingdao storage court function of electrolyte additive synergistic combination strategy, to achieve a sharp rise in the next generation of high-energy lithium-ion battery performance goals, such as high voltage cobalt acid lithium/graphite full battery system (Energy Technology, 2017, 5,Advanced Energy Materials, 2018, 8,1701398) although these research work on the synergy mechanism of additives made certain guiding explanation, but limited to the technology of in situ characterization, may not be able to reflect the reaction of the true state of the electrode/electrolyte interface in recent years, in situ characterization of the development of the technology for the development of high performance liquid electrolyte and the electrode/electrolyte interface formation mechanism research has injected new vitalityGas is an important product of electrode/electrolyte interface reaction, determine the product gas combined with the interface of solid characterization analysis to realize the effective resolution electrode/electrolyte interface reaction, and the difference in situ electrochemical mass spectrometry (in - situ DEMS) for quantitative battery can real-time monitor gas behavior under different potentials and high-profile figure 1 (a) Qingdao energy storage house the in - situ DEMS (Hiden.And HPR HPR - 20-40) and the combination of the theoretical calculation method, the electrolyte Additives for High capacity of silicon carbon negative effects of electrolyte/electrode interface (figure 1 b - d), and successfully build a 5 v Voltage High nickel manganese acid lithium/silicon carbon full battery system, the development of this additive to the electrolyte function and research deeply has important guiding significance to the interface, work related to Tracing the Impact of Hybrid Functional Additives on a High - Voltage (5In addition, Qingdao energy storage institute also independently developed a new type of large anionic structure of LiTFPFB as the main electrolyte salt.

The amount of binder used in lithium ion battery electrode is very small, but it plays a key role, but it is easy to be neglected in the research. Polyvinylidene fluoride (PVDF) is the most commonly used binder for cathode materials. In recent years, studies have found that the instability of PVDF under high voltage operating conditions is an important reason for the performance attenuation of the next generation of high-energy lithium batteries. The renewable lignin containing a large number of phenol groups was used as a new functional binder in Qingdao energy storage institute for 5V high-voltage lithium ni-mn anode material, and the recycling performance of the new anode material was greatly improved. The full test, found that lignin phenol group in the binder can eliminate free radicals and termination of free radical chain reaction of the electrolyte, thus inhibiting the oxidation decomposition of the electrolyte, the construction of high stability of electrolyte/electrode interface, the work of high voltage anode materials for the development of adhesives is a milestone significance, Work related to A biomass -based free radical scavenger binder endowing A compatible cathode interface for 5 V lithium - ion batteries as the subject, published online in the Energy & Environmental Science (2018, DOI: 10.1039 / c8ee02555j).

The achievements made by Qingdao energy storage institute in the research field of the next generation of high-energy lithium ion batteries and their supporting electrolytes and adhesives have been highly recognized by the international counterparts. They were invited to write a review on 5V high-voltage lithium nickel manganese acid batteries (Chemistry of Materials, 2016, 28, 3578-3606). Review of electrolyte flame retardants (energy storage science)

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Related series research for outstanding youth science fund of national natural science fund, the national key research projects, cas pilot projects, Qingdao energy storage industry scientific research, a think-tank, mutual funds, the national natural science foundation of China youth science fund, in shandong province natural science foundation of China, Qingdao energy funded by "135" project, etc.