(Bloomberg) -- After a dismal first six months, things are finally looking up for initial public offerings in Hong Kong as several large Chinese firms line up to list in Asia’s financial hub in the second half. Battery materials producer Tianqi Lithium Corp. just opened its books for what is set to be the city’s first billion-dollar deal this year while China Tourism Group Duty Free Corp. may relaunch an offering of around $2 billion. Along with several other mid- to large-sized deals in the pipeline, they are poised to revive a dormant market where firms raised a paltry $2.6...