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To reduce the high irreversible capacity (Qirr) of Si thin flake (Si-LP) negative electrode, carbon-coated Si-LPs were prepared using citric acid as a precursor and their charge/discharge properties were investigated as negative electrodes in lithium-ion batteries. The carbon-coated powder was homogeneously coated with a thin carbon layer (8–10 and 6–8nm in thickness for Si-LPs heat-treated at 600 and 700°C, respectively, 14wt% for each). The irreversible capacity Qirr was successfully reduced to about a half (ca. 1100mAhg−1) of that of the pristine Si-LP (2336mAhg−1), though the cycleability was slightly deteriorated. The cycleability of Si-LP@Cs was significantly improved by the addition of 10wt% VC in the electrolyte solution. Si-LP@C(700°C) kept high discharge capacities over 2000mAhg−1 even after 50 cycles with a reduced Qirr of ca. 1300mAhg−1 compared with the pristine Si-LP (ca. 2450mAhg−1). © The Electrochemical Society of Japan, All rights reserved.

Carbon Coating of Si Thin Flakes and Negative Electrode Properties in Lithium-Ion Batteries