A new generation of lithium battery rich lithium manganese anode materials

At present, electric cars face the shortage of short range and safety problems of restricting its large-scale promotion. If the electric car with fuel considerable range (~ 500 kilometers), when consumer is driving electric cars will be no more range anxiety, advantageous to realize the large-scale promotion of electric vehicles. The current commercial power lithium battery energy density is in commonly 150 wh/kg to achieve double range, power lithium ion batteriesThe energy density must be doubled to 300-400 wh/kg.From a technical level, the higher specific capacity of anode materials is improved battery energy density is the most effective way to directly.

In known positive material, rich lithium manganese anode material discharge specific capacity as high as 300 mAh/g, is the current commercial applications and ternary material lithium iron phosphate cathode material discharge specific capacity of The Times, and therefore is regarded as a new generation of high energy density lithium battery anode materials ideal. Although rich lithium manganese anode material has the discharge specific capacity of the absolute superiority, but its practical application in power lithium battery, must address the following key scientific and technical problems: one is to reduce the irreversible capacity loss for the first time. The second is to improve the performance and cycle life;3 it is to suppress voltage decay cycle.

Ningbo material technology and engineering research institute, Chinese academy of sciences high power lithium battery Liu Zhao peaceful Xia Yong engineering laboratory team for many years has been committed to the rich lithium manganese anode material research and development, the preparation methods, mechanism of composition optimization, charge and discharge and surface modification made a series of meaningful research work, has gained rich research achievements (J.M ater. Chem. A2011, 21254;Intel. J. lectrochem. Sci. 2011,6,6670;Electrochim. Acta, 2012,66,61;Electrochim. Acta, 2012,80,15;J. owerSources, 2012218128;J. owerSources, 2013240530;2014,6,9185 ACSAppl. Mater. Interfaces,; J. owerSources, 2014268517;Electrochim. Acta2014, 123:317;J. owerSources, 2014268683;Chem. Eur. J., 2015,21,7503;J.M ater. Chem. A, 2015,22,11930;J. owerSources, 2015281, 7).

In 2013, the research team developed a novel gas-solid interface modification (CN201310416745.1, PCT/CN2013/088597), let the rich lithium manganese anode material particles form a uniform oxygen vacancy, thus greatly improving the efficiency of the first charge and discharge of the material, the discharge specific capacity and cyclic stability. Since then, they with multiple research teamwork and collaborative innovation at home and abroad, using various advanced analysis characterization methods and theoretical calculation, study the mechanism of lithium ion to take off the embedded in the presence of oxygen vacancy. The brookhaven national laboratory (BNL), professor Zhu overflow eyebrow, such as using wuri army advanced transmission electron microscope to the oxygen vacancy, professor at the university of California, San Diego (UCSD) Meng Ying team used neutron diffraction of oak ridge national laboratory to prove that the existence of lattice oxygen vacancy, munster university Dr. Wang jun in situ electrochemical gas phase mass spectrometry was used to study the change of lattice oxygen in the process of charging and discharging, high reported use of Shanghai synchrotron radiation light source of X-ray diffraction (XRD)/absorption spectrum proved that the oxygen vacancy does not change the crystalline structure of the material, Meng Ying group Dr. Minghao Zhang also found oxygen vacancy improved the material by DFT theory calculation of lattice oxygen activity. The research is published in NatureCommunications2016, 08, 7121 was highly appraised the referees. The work was first put forward by improving the activity of lattice oxygen to improve the rich lithium manganese anode material charging and discharging efficiency and performance ratio for the first time, provides a new way of thinking for the research of the material modification. In addition, the gas-solid interface modification method is relatively simple, controllable and easy realization of engineering, the rich lithium manganese anode material with good performance of engineering development provides a new way. At present, the research team is using the modified method enhanced its rich lithium manganese anode material of pilot testing.

That the research work is strategy the forerunner of the Chinese academy of sciences class A project "transformative nano industry manufacturing technology focusing on" special "long life power lithium battery" project (XDA09010101), CAS - DOE international cooperation project "A new generation of lithium ion battery rich lithium manganese anode material structure and mechanisms of lithium storage" kysb20150047 (174433) and A new generation of lithium ion battery materials innovation teams funded by b82001 (2012).

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