Abstract
Spinel Li4Ti5O12 has become an alternative material to replace graphite anodes in terms of solving safety issues and improving battery life-time. Unfortunately, as Li4Ti5O12 is an insulator, the low electrical conductivity becomes a major drawback, as it is unfavorable to higher rate capability. In addition to the low electronic conductivity, severe gassing during charge/discharge cycles is a critical but often-overlooked problem of Li4Ti5O12 batteries. Li4Ti5O12/C microspheres were prepared by assembling the nano-Li4Ti5O12 (50–300 nm) with pitch derived pyrolytic carbon. It was found that the coated carbon in Li4Ti5O12/C microspheres can effectively inhibit gassing and Mn deposition in LiMn2O4//Li4Ti5O12 battery. Carbon can also significantly improve rate capability and cycling performance compared with that of Li4Ti5O12 microspheres without carbon due to stable interface and superior electronic conductivity.
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