CATHODE ACTIVE MATERIAL FOR SECONDARY BATTERY
이차전지용 양극 활물질
The present invention provides a cathode active material for a secondary battery, comprising: a core comprising a lithium transition metal oxide; a first coating part formed on at least a portion of the surface of the core; and a second coating part that is formed on at least a portion of a region where the first coating part is not formed on the surface of the core and that selectively covers the surface of the first coating part, wherein the first coating part has a relatively high ratio of crystalline regions, and the second coating part has a relatively high ratio of amorphous regions. Such a cathode active material can provide a secondary battery having desired features by effectively suppressing the oxygen desorption phenomenon or the like to increase structural stability, and preventing a side reaction of an electrolyte solution.
본 발명은, 리튬 전이금속 산화물을 포함하는 코어와, 상기 코어 표면의 적어도 일부에 형성되어 있는 제 1 코팅부, 및 상기 코어 표면 중 제 1 코팅부가 미형성된 영역의 적어도 일부에 형성되어 있고 선택적으로 제 1 코팅부 표면을 덮는 제 2 코팅부를 포함하고, 상기 제 1 코팅부는 결정질 영역의 비율이 상대적으로 높고, 상기 제 2 코팅부는 비정질 영역의 비율이 상대적으로 높은 것을 특징으로 하는 이차전지용 양극 활물질을 제공한다. 이러한 양극 활물질은 산소탈리 현상 등을 효과적으로 억제하여 구조적 안정성을 높이고 전해액 부반응을 방지하여 소망하는 특성의 이차전지를 제공할 수 있다.
L&F CO LTD [KR] (주식회사 엘 앤 에프)
KWON SU YOUN [KR] (권수연)
KIM KYUNG MIN [KR] (김경민)
LIM JIN HYEON [KR] (임진현)
KIM DONG WOO [KR] (김동우)
CHANG SUNG KYUN [KR] (장성균)
JEONG JAE HAK [KR] (정재학)
Other family members:
KR 20230056594 A,
Pub. Date: 2023-04-27,
A composite lithium manganese iron phosphate material and its preparation method and application
The invention relates to a composite lithium manganese iron phosphate material and its preparation method and application. The composite lithium manganese iron phosphate material has a core-shell structure, the core layer includes a garnet phase solid electrolyte, and the shell layer includes lithium manganese iron phosphate. In the present invention, the core-shell structure is adopted, and the garnet phase solid electrolyte with high lithium ion conductivity is set as the core layer, which can effectively improve the ion conductivity of the lithium manganese iron phosphate material, thereby improving the cycle performance of the battery.
A modified lithium manganese iron phosphate cathode material and its preparation method and application
The invention provides a modified lithium manganese iron phosphate positive electrode material and its preparation method and application. The modified lithium manganese iron phosphate positive electrode material includes a doped lithium manganese iron phosphate core and is arranged on the doped manganese iron phosphate A cladding layer on the surface of the lithium iron core core, the doped lithium manganese iron phosphate core includes Nb elements, the cladding layer includes LiNbO3 and Nb2O5, the doped Nb element of the modified lithium manganese iron phosphate positive electrode material of the present invention , the surface is double-coated with LiNbO3 and Nb2O5. The coating layer of the modified lithium manganese iron phosphate cathode material has good uniformity, consistency and conductivity. LiNbO3 and Nb2O5 synergistically improve the rate performance and long cycle of the LMFP electrode material performance.