Aqueous Lithium-ion Battery LiTi2(PO4)3/LiMn2O4 with High Power and Energy Densities as well as Superior Cycling Stability**
✍ Scribed by J.-Y. Luo; Y.-Y. Xia
- Publisher
- John Wiley and Sons
- Year
- 2007
- Tongue
- English
- Weight
- 408 KB
- Volume
- 17
- Category
- Article
- ISSN
- 1616-301X
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✦ Synopsis
Abstract
Porous, highly crystalline Nasicon‐type phase LiTi~2~(PO~4~)~3~ has been prepared by a novel poly(vinyl alcohol)‐assisted sol–gel route and coated by a uniform and continuous nanometers‐thick carbon thin film using chemical vapor deposition technology. The as‐prepared LiTi~2~(PO~4~)~3~ exhibits excellent electrochemical performance both in organic and aqueous electrolytes, and especially shows good cycling stability in aqueous electrolytes. An aqueous lithium‐ion battery consisting of a combination of LiMn~2~O~4~ cathode, LiTi~2~(PO~4~)~3~ anode, and a 1 M Li~2~SO~4~ electrolyte has been constructed. The cell delivers a capacity of 40 mA h g^–1^ and a specific energy of 60 W h kg^–1^ with an output voltage of 1.5 V based on the total weight of the active electrode materials. It also exhibits an excellent cycling stability with a capacity retention of 82 % over 200 charge/discharge cycles, which is much better than any aqueous lithium‐ion battery reported.