The market and consumers' high concern about the cruising range of electric vehicles and portable electronic products drives the continuous improvement of the energy density of lithium-ion batteries. The most commonly used strategy to improve the energy density of lithium-ion batteries is to develop new high-voltage high-capacity cathode materials (such as lithium nickel manganese oxide, high-voltage lithium cobalt oxide, high-voltage ternary materials, etc.) or high-capacity negative electrode materials (such as silicon-carbon materials) ). However, these new electrode materials have poor compatibility with traditional electrolytes and binders, making it difficult to form a stable interface, which has become one of the bottlenecks restricting the commercialization process of next-generation high-energy lithium-ion batteries. Relying on the Qingdao Energy Storage Industry Technology Research Institute built by the Qingdao Institute of Bioenergy and Processes of the Chinese Academy of Sciences, the research on the next generation of high-energy lithium-ion batteries and their supporting electrolytes and binders is one of the main research areas. As we all know, the electrolyte is the "blood" of lithium-ion batteries. The development of high-performance electrolytes and the study of the electrode / electrolyte interface formation mechanism will greatly improve the performance of next-generation high-energy lithium-ion batteries. Inspired by the traditional Chinese medicine and Western medicine "medicine synergistic combination" idea, Qingdao Energy Storage Institute further developed the "electrolyte functional additive synergistic combination" strategy to achieve a significant improvement in the performance of next-generation high-energy lithium-ion battery performance goals, such as high-voltage cobalt Lithium / graphite full battery system (Energy Technology, 2017, 5, 1979-1989) and 5V high voltage lithium nickel manganate / graphite full battery system (Advanced Energy Materials, 2018, 8, 1701398). Although these studies have provided a guiding explanation for the synergistic mechanism of additives, they are limited to the characterization of ex-situ techniques and may not reflect the true state of the electrode / electrolyte interface reaction. In recent years, the development of in-situ characterization techniques has injected new vitality into the development of high-performance electrolytes and the study of electrode / electrolyte interface formation mechanisms. Gas is an important product of the electrode / electrolyte interface reaction. Determining the gas product and combining the interface solid-state product characterization analysis will achieve an effective analysis of the electrode / electrolyte interface reaction. In-situ DEMS The ability to monitor the gas production behavior of quantitative batteries at different potentials in real time has attracted much attention (Figure 1a). Qingdao Energy Storage Institute uses a combination of in-situ DEMS (Hiden, HPR-20 and HPR-40) and theoretical calculations to study the effect of electrolyte additives on the electrolyte / electrode interface reaction in high-capacity silicon-carbon anodes (Figure 1b) -d), and successfully constructed a 5V high voltage lithium manganese nickel / silicon carbon full battery system, which has important guiding significance for the development of electrolyte functional additives and in-depth research on interfaces. Related work is based on Tracing the Impact of Hybrid Functional Additives on a High-Voltage (5 V-class) SiOx-C / LiNi0.5Mn1.5O4 Li-ion Battery System was published in Chemistry of Materials (2018, 30, 8291-8302) as the title. In addition, Qingdao Energy Storage Institute independently developed a new type of perfluoro-tert-butoxy lithium trifluoroborate (LiTFPFB) with a large anion structure as the main electrolyte salt (Chemical Science). The amount of binder used in lithium ion battery electrodes is very small, but it plays a key role, but it is easily overlooked in research. Polyvinylidene fluoride (PVDF) is the most commonly used binder for cathode materials. In recent years, studies have found that PVDF is unstable under high-voltage operating conditions, which is an important reason for the performance degradation of next-generation high-energy lithium batteries. Qingdao Energy Storage Institute uses renewable lignin containing a large number of phenol groups as a new functional binder for 5V high voltage lithium nickel manganate cathode materials. The cycle performance of this new cathode material has been greatly improved. It has been found through sufficient experiments that the phenol group in the lignin binder can eliminate free radicals in the electrolyte and terminate the chain reaction of the free radicals, thereby inhibiting the oxidative decomposition of the electrolyte and constructing a highly stable electrolyte / electrode Interface, this work has a milestone guiding significance for the development of high-voltage cathode material binders. Related work was published online in Energy & Environmental on the topic of A biomass based free radical scavenger binder endowing a compatible cathode interface for 5 V lithium-ion batteries Science (2018, DOI: 10.1039 / c8ee02555j). Qingdao Energy Storage Institute's achievements in the research field of next-generation high-energy lithium-ion batteries and their supporting electrolytes and binders are highly recognized by international peers. They were invited to write a review of 5V high-voltage lithium-manganese nickel-ion battery (Chemistry of Materials , 2016, 28, 3578-3606); review of electrolyte flame retardants (Energy Storage Science and Technology, 2018, 6 (7), 1040-1059); review of high-voltage lithium cobalt oxide batteries (Chemical Society Reviews, 2018, 47, 6505-6602); review of the ternary cathode material polymer electrolyte (Electrochemical Energy Reviews, 2018, received); review of a series of articles on high-performance binders (Energy Storage Materials, 2018). Related series of studies won the National Natural Science Foundation Outstanding Youth Science Fund, the National Key R & D Program, the Nano Pilot Project of the Chinese Academy of Sciences, the Qingdao Energy Storage Industry Scientific Research Think Tank Joint Fund, the National Natural Science Foundation Youth Science Fund, the Shandong Natural Science Foundation, Qingdao Energy The “13th Five-Year†project has been heavily supported.
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