| 发明名称 |
HIGH VOLTAGE LITHIUM ION POSITIVE ELECTRODE MATERIAL |
| 摘要 |
A positive electrode material having a nominal stoichiometry Li1+y/2Co1−x−y−z−dSizFexMyM′d(PO4)1+y/2 where M is a trivalent cation selected from at least one of Cr, Ti, Al, Mn, Ni, V, Sc, La and/or Ga, M′ is a divalent cation selected from at least one of Mn, Ni, Zn, Sr, Cu, Ca and/or Mg, y is within a range of 0<y≦0.10 and x is within a range of 0≦x≦0.2. The use of double compositional modification to LiCoPO4 increases the discharge capacity from ˜100 mAh/g to about 130 mAh/g while retaining the discharge capacity retention of the singly Fe-substituted LiCoPO4. Additional compositional modification to include Si increases the cycle life and greatly improved the coulombic efficiency to between 97-100% at a C/3 cycle rate, |
| 申请公布号 |
US2015155558(A1) |
申请公布日期 |
2015.06.04 |
| 申请号 |
US201414281924 |
申请日期 |
2014.05.20 |
| 申请人 |
U.S. Army Research Laboratory ATTN: RDRL-LOC-I |
发明人 |
Allen Jan L.;Allen Joshua L.;Delp, III Samuel A.;Wolfenstine Jeffrey B.;Jow T. Richard |
| 分类号 |
H01M4/58 |
主分类号 |
H01M4/58 |
| 代理机构 |
|
代理人 |
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| 主权项 |
1. A positive electrode material comprising:
a Li-ion positive electrode material having a nominal stoichiometry of:
Li1+y/2Co1−x−y−z−dSizFexMyM′d(PO4)1+y/2 where M is a trivalent cation selected from at least one of Cr, Ti, Al, Mn, Ni, V, Sc, La and/or Ga, M′ is a covalent cation selected from at least one of Mn, Ni, Zn, Sr, Cu, Ca and/or Mg, y is within a range of 0<y≦0.10, x is within a range of 0≦x≦0.20, z is within a range of 0≦z≦0.10 and d is within a range of 0≦d≦0.20; said Li-ion positive electrode material having an initial capacity of at least 120 mAh/g and a discharge capacity of at least 100 mAh/g after 500 cycles. |
| 地址 |
Adelphi MD US |
