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Citation: Wang Wei-Kun, Wang An-Bang, Cao Gao-Ping, Yang Yu-Sheng. Electrochemical Performance of a Novel Cathode Material Phenyl Polysulfide for Lithium Batteries[J]. Acta Physico-Chimica Sinica, ;2004, 20(12): 1440-1444. doi: 10.3866/PKU.WHXB20041208 shu

Electrochemical Performance of a Novel Cathode Material Phenyl Polysulfide for Lithium Batteries

1.
Military Power Sources Research ＆ Development Center of Chemical Defense Institute, Beijing　100083

Received Date: 30 April 2004
Available Online: 15 December 2004

A novel orgnaosulfur cathode material named phenyl polysulfide(PPS) for lithium batteries was studied. The highly crosslinked stucture of this material with phenyl repeat units covalently linked by －Sx－moieties(x≥ 2) was designed to reduce the generation of small molecule during discharging which was one of the main reasons for its cycling capacity fade. A series of PPS with different sulfur contents were prepared through the reaction between hexachlorobenzene and Na2Sx(x ≥ 2). Galvanostatic cycling and cyclic voltammetry were used to investigate the electrochemical characteristics of this material. The results demonstrated that higher sulfur content of the material led to higher discharge capacity but more serious capacity fade during cycling. The sample PPS-10 containing 91.99％ sulfur exhibited high capacity up to 756 mAh·g－1 in the initial cycle and a stable reversible capacity 367 mAh·g－1 after 20 cycles. The discharge mechanism, the reason for capacity fade during cycling and poor coulomb efficiency of the materials were also discussed.
- Lithium battery;　Cathode material;　Phenyl polysulfide;　Electrochemistry performance
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沈阳化工大学材料科学与工程学院沈阳 110142

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