(LEAD) Samsung SDI's net loss widens in Q4

(ATTN: RECASTS 2-3 paras; ADDS details in para 5-12) By Kang Yoon-seung SEOUL, Jan. 25 (Yonhap) -- Samsung SDI Co., the battery-making unit of Samsung Group, said Monday its net loss widened in the fourth quarter of 2015 from a year earlier. The