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Synthesis and characterization of ca...

Yang, Shoufeng.

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Synthesis and characterization of cathode, anode and electrolyte materials for rechargeable lithium batteries.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Synthesis and characterization of cathode, anode and electrolyte materials for rechargeable lithium batteries./
作者:	Yang, Shoufeng.
面頁冊數:	189 p.
附註:	Source: Dissertation Abstracts International, Volume: 64-08, Section: B, page: 3822.
Contained By:	Dissertation Abstracts International64-08B.
標題:	Chemistry, Inorganic. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3102854

Synthesis and characterization of cathode, anode and electrolyte materials for rechargeable lithium batteries.
Yang, Shoufeng.

Synthesis and characterization of cathode, anode and electrolyte materials for rechargeable lithium batteries. - 189 p.

Source: Dissertation Abstracts International, Volume: 64-08, Section: B, page: 3822.

Thesis (Ph.D.)--State University of New York at Binghamton, 2003.

Two new classes of cathode materials were studied: iron phosphate/sulfate materials and layered manganese oxides, both of which are low cost and had shown some potential. The first class of materials have poor conductivity and cyclability. I studied a number of methods for increasing the conductivity, and determined that grinding the material with carbon black was as effective as special in-situ coatings. The optimum carbon loading was determined to be between 6 and 15 wt%. Too much carbon reduces the volumetric energy density, whereas too little significantly increased cell polarization (reduced the rate of reaction). The kinetic and thermodynamic stability of LiFePO 4 was also studied and it was determined that over discharge protection will be needed as irreversible Li3PO4 can be formed at low potentials. A novel hydrothermal synthesis method was developed, but the significant level of Fe on the Li site reduces the reaction rate too much. In the case of the layered manganese oxide, cation substitution with Co and Ni is found to be effective in avoiding Jahn-Teller effects and improving electrochemistry.Subjects--Topical Terms:

517253
Chemistry, Inorganic.

Synthesis and characterization of cathode, anode and electrolyte materials for rechargeable lithium batteries.
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100 1 $a Yang, Shoufeng. $3 1952656
245 1 0 $a Synthesis and characterization of cathode, anode and electrolyte materials for rechargeable lithium batteries.
300 $a 189 p.
500 $a Source: Dissertation Abstracts International, Volume: 64-08, Section: B, page: 3822.
500 $a Adviser: M. Stanley Whittingham.
502 $a Thesis (Ph.D.)--State University of New York at Binghamton, 2003.
520 $a Two new classes of cathode materials were studied: iron phosphate/sulfate materials and layered manganese oxides, both of which are low cost and had shown some potential. The first class of materials have poor conductivity and cyclability. I studied a number of methods for increasing the conductivity, and determined that grinding the material with carbon black was as effective as special in-situ coatings. The optimum carbon loading was determined to be between 6 and 15 wt%. Too much carbon reduces the volumetric energy density, whereas too little significantly increased cell polarization (reduced the rate of reaction). The kinetic and thermodynamic stability of LiFePO 4 was also studied and it was determined that over discharge protection will be needed as irreversible Li3PO4 can be formed at low potentials. A novel hydrothermal synthesis method was developed, but the significant level of Fe on the Li site reduces the reaction rate too much. In the case of the layered manganese oxide, cation substitution with Co and Ni is found to be effective in avoiding Jahn-Teller effects and improving electrochemistry.
520 $a A wide range of tin compounds have been suggested as lithium storage media for advanced anode materials, as tin can store over 4 Li per Sn atom.
520 $a Lithium hexafluorophosphate, LiPF6, is presently the salt of choice for LiCoO2 batteries, but it is expensive and dissolves some manganese compounds. The lithium bis(oxolato)borate (BOB) salt was recently reported, and I made a study of its use in cells with the LiFePO4 cathode and the tin anode. During its synthesis, it became clear that LiBOB is very reactive with many solvents, and these complexes were characterized to better understand this new material. In LiBOB the lithium is five coordinated, an unstable configuration for the lithium ion so that water and many other solvents rapidly react to make a six coordination. Only in the case of ethylene carbonate was the lithium found to be four coordinated. The LiBOB based electrolyte has a lower ionic conductivity than LiPF6, thus providing a poorer performance, while the capacity retention is improved. Further improvement of conductivity is still needed.
520 $a Improved LiFePO4 cathode materials have been formed, the behavior of pure tin in the form of foil has been determined and will serve as the base case for future studies of tin based anodes, and the structure and electrochemical behavior of the new LIBOB electrolyte salt has been determined. (Abstract shortened by UMI.)
590 $a School code: 0792.
650 4 $a Chemistry, Inorganic. $3 517253
650 4 $a Energy. $3 876794
690 $a 0488
690 $a 0791
710 2 0 $a State University of New York at Binghamton. $3 737493
773 0 $t Dissertation Abstracts International $g 64-08B.
790 1 0 $a Whittingham, M. Stanley, $e advisor
790 $a 0792
791 $a Ph.D.
792 $a 2003
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3102854