16 1 Vol. 16 No ELECTROCHEMISTRY Feb. 2010

Transcription

1 16 1 Vol 16 No ELECTROCHEMISTRY Feb Ⅰ * O TM911 A SEI Tel xpai@ whu edu cn 973 No 2009CB No 2007AA03Z224 No

2 1 Ⅰ 7 1 Fig 1 Schematic illustration of the working mechanism of redox shuttles 90 p - 5 Fe bpy 3 ClO 4 2 Ru bpy 3 ClO V 20 ~ 50 mmol L TDB 0 5 mol L V vs Li + /Li 6 TDB 5 ma cm % Fig 2 Schematic demonstration of the action of potentialswitchable seperators in Li-ion batteries TDB 5% 3 6 V 3 C p- - 2

3 LiFePO V vs Li + /Li LiCoO 2 LiMn 2 O ~ 4 3 V 3 LiFePO 4 LiCoO 2 LiMn 2 O 4 Positive Temperature Coefficient PTC 3 6 V 4 3 V 4 n- n- PTC 0 V PTC PPy PAn PTh PPP - PTC 10-9 S cm S cm - 1 PTC 0 01 ~ 5 S cm ~ 150 S cm ~ 500 S PTC cm V 10 / BaTiO 3 PTC PTC 4 31 V 8 - PTC 12 40% - PTC V 70 ~ PTC 3 7 V 2 C PTC LiCoO 2 /PTC 20 LiCoO 2 -PTC 130 mah g - 1 PTC

4 1 Ⅰ 9 80 LiCoO 2 60 mah g % 100 mv 100 mv 100 LiCoO 2 20 mah g % 4- TMPP 4 35 PTC V References 1 Moshkovich M Cojocaru M Gottlieb H E et al The study of the anodic stability of alkyl carbonate solutions by in situ FTIR spectroscopy EQCM NMR and MS J Journal of Electroanalytical Chemistry Du Pasquier A Disma F Bowmer T et al Differential scanning calorimetry study of the reactivity of carbon anodes in plastic Li-ion batteries J J Electrochem Soc DMMP 3 Xiao Lifen Ai Xinping Cao Yuliang et al Electrochemical behavior of biphenyl as polymerizable additive for o- ~ 1 75 mpa s vercharge protection of lithium ion batteries J Electrochimica Acta V 6 ms cm Feng X M Ai X P Yang H X Possible use of methylbenzenes as electrolyte additives for improving the over- DMMP charge tolerance of Li-ion batteries J Journal of Applied Electrochemistry Cha C S Ai X P Yang H X Polypyridine complexes of Cl-EC 13 iron used as redox shuttles for overcharge protection of secondary lithium batteries J Journal of Power 10% Cl-EC LiClO 4 -DMMP Sources LiCoO 2 /C 6 Feng J K Ai X P Cao Y L et al A highly soluble dimethoxybenzene derivative as a redox shuttle for overcharge DMMP protection of secondary lithium batteries J Electro-

5 chemistry Communications Li S L Ai X P Feng J K et al Diphenylamine A safety electrolyte additive for reversible overcharge protection of 3 6 V-class lithium ion batteries J Journal of Power Sources Xiao L F Ai X P Cao Y L et al A composite polymer membrane with reversible overcharge protection mechanism for lithium ion batteries J Electrochemistry Communications Novak Petr Muller Klaus Santhanam K S V et al Electrochemically active polymers for rechargeable batteries J Chem Rev Feng J K Ai X P Cao Y L et al Polytriphenylamine used as an electroactive separator material for overcharge protection of rechargeable lithium battery J Journal of Power Sources Li S L Ai X P Yang H X et al A polytriphenylaminemodified separator with reversible overcharge protection for 3 6 V-class lithium-ion battery J Journal of Power Sources Feng X M Ai X P Yang H X et al A positive-temperature-coefficient electrode with thermalcut-off mechanism for use in rechargeable lithium batteries J Electrochemistry Communications Feng J K Sun X J Ai X P et al Dimethyl methyl phosphate A new nonflammable electrolyte solvent for lithium-ion batteries J Journal of Power Sources Feng J K Cao Y L Ai X P et al Tri- 4-methoxythphenyl phosphate A new electrolyte additive with both fire-retardancy and overcharge protection for Liion batteries J Electrochimica Acta Self-activating Safety Mechanisms for Li-ion Batteries AI Xin-ping * CAO Yu-Liang YANG Han-Xi College of Chemistry and Molecular Sciences Hubei Key Lab of Eletrochemical Power Sources Wuhan University Wuhan China Abstract The safety concerns of LIBs are considered to be a main obstacle to their high rate or large capacity applications in electric vehicles This paper describes briefly our research works on the development of self-activating safety mechanisms for LIBs including redox shuttle potential-sensitive separator temperature-sensitive e- lectrode and fire-retardent electrolyte The problems and future in this research area are also discussed Key words lithium ion battery overcharge protection safety fire-retardancy temperature-sensitive electrode