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Using an improved single-step hydrothermal method, mesoporous hard carbon nano-balls, with nitrogen doping, have been successfully synthesized. These materials exhibit good reversible charge capacity during half-cell tests. Gravimetric capacity for undoped nano-sized and micron-sized mesoporous hard carbon balls is 506 and 475 mAh g−1, respectively. After nitrogen doping, the specific gravimetric...
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