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(a) Cycling performance, (b) first charge/discharge curves, and (c) first charge/discharge curves of (Si/graphite)@C and (Si/graphite/graphene)@C composite; discharge/charge curves of (d) (Si/graphite)@C composite and (e) (Si/graphite/graphene)@C composite; (f) capacity ratio variation curves of discharge current at 100 mA/g with different cycles.
