Combined with existing tariffs, the 93.5% preliminary anti-dumping tariffs the U.S. Commerce Department announced this week on anode-grade graphite imported from China, targeting nearly $350 million in goods, promises to deal a major blow to battery producers. It would bring the tariffs to 160% on the notion that Chinese graphite is being sold in the U.S. below fair market value. And it gets worse than that for some Chinese producers. China’s Huzhou Kaijin New Energy Technology and Shanghai Shaosheng Knitted Sweat, specifically,…