A Novel Li-Battery Cathode Material: Synthesis and Characterization of Li(Mn1-xCox)BO3
Nevertheless, the lithium intercalation potentials in borate compounds are lower than in phosphates which will limit their energy density . Theoretically, LiCoBO3 is the most interesting borate compound in term of operating voltage and specific capacity; however, approaching its theoretical capacity seems difficult due to the structural/chemical instability of fully delithiated LiCoBO3 .
In order to have both reversible capacity and relatively high voltage, new Li(Mn1-xCox)BO3 have been explored. These materials have been synthesized for the first time by a multiple-step process. This one includes the synthesis of two intermediates essential to prevent the formation of metallic cobalt and Mn3+during the heat treatment.
Powders X-Ray diffraction patterns of Li(Mn1-xCox)BO3 and the evolution of lattice parameters with the cobalt content will be presented. TEM and neutron powder diffraction were carried out on these materials. Interestingly, ED patterns indicate that the C2/c space group previously reported for m-LiMnBO3  and LiCoBO3  cannot describe Li(Mn1-xCox)BO3 compounds. Neutron diffraction helps with the complete resolution of the structure and will be discussed during the presentation.
Electrochemical characterizations were also carried out on Li(Mn1-xCox)BO3 (0 ≤ x ≤ 1). Each material shows electrochemical activity, without in situ carbon coating. In order to improve performances of these compounds, an optimized synthesis has been developed and will be presented.
 V. Legagneur et al., Solid State Ionics 139 (2001) 37
 D-H. Seo et al., Physical Review B 83, 205127 (2011)
 Y. Yamashita et al., ECS Electrochemistry Letters, 2 (8) A75-A77 (2013)
 O.S. Bondareva et al., Sov. Phys. Crystallogr. 23 (1978) 269