Chemistry: electrical current producing apparatus – product – and – Current producing cell – elements – subcombinations and... – Include electrolyte chemically specified and method
Patent
1994-08-30
1996-05-07
Willis, Jr., Prince
Chemistry: electrical current producing apparatus, product, and
Current producing cell, elements, subcombinations and...
Include electrolyte chemically specified and method
429194, 429218, 429223, 429232, 420417, 423608, H01M 616
Patent
active
055144900
ABSTRACT:
An improved lithium secondary battery using a novel layered titanium phosphate having the formula of TiO(OH)(H.sub.2 PO.sub.4), or LTP, as anode material, and LiCoO.sub.2, LiNiO.sub.2, or other appropriate material, as cathode. A stable operating voltage of 3-volt can be obtained from the resultant lithium secondary battery. The layered titanium phosphate is prepared by first reacting a tetramethylammonium hydroxide (N(CH.sub.3).sub.4 OH) solution containing orthophosphoric acid with titanium dioxide in a low temperature hydrothermal reaction to form a tetramethylammonium form of layered titanium phosphate, or NMe.sub.4 TP, which serves as the precursor of LTP. The precursor NMe.sub.4 TP is then placed in a concentrated hydrochloric acid at room temperature to obtain a high purity LTP via a cation exchange reaction. Each of the Li.sub.x LTP chemical unit, which is formed after the intercalation of LTP with lithium ions, can contain two lithium ions, thus excellent lithium intercalation characteristic can be achieved as a result. Furthermore, no lithium dendrites are formed during the recharging operation which tend to puncture the partition membranae separating the anode and the cathode; therefore, the secondary lithium battery allows a safe recharging operation to be maintained.
REFERENCES:
patent: 4985317 (1991-01-01), Adachi et al.
patent: 5310553 (1994-05-01), Simon et al.
patent: 5316875 (1994-05-01), Murai et al.
Yingjeng James Li, et al., "Hydrothermal synthesis of new metastable phases: preparation and intercalation of a new layered titanium phosphate", Elsevier Science Publishers B.V. 1993/pp. 391-395 (month N/A).
Chen Jin-Ming
Hurng Weir-Mirn
Li Yingjeng J.
Whittingham M. Stanley
Industrial Technology Research Institute
Liaugh W. Wayne
Nuzzolillo M.
Willis Jr. Prince
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