Enhanced rate capability and mitigated capacity decay of ultrahigh-nickel cobalt-free LiNi_(0.9)Mn_(0.1)O_(2) cathode at high-voltage by selective tungsten substitution
作者机构：Engineering Research Center of the Ministry of Education for Advanced Battery MaterialsSchool of Metallurgy and EnvironmentCentral South UniversityChangsha 410083China
出 版 物：《Chinese Chemical Letters》 (中国化学快报（英文版）)
年 卷 期：2023年第34卷第7期
页 面：354-359页
核心收录：
学科分类：081702[工学-化学工艺] 0808[工学-电气工程] 08[工学] 0817[工学-化学工程与技术] 0703[理学-化学]
基 金：financial support from the National Natural Science Foundation of China (Nos. 51908555 52070194)
主 题：Lithium-ion batteries Ultrahigh-nickel cobalt-free cathode In-situ tungsten doping High cut-off voltage Rapid charge performance
摘 要：Owing to the further requirement for electric vehicle market, it is appropriate to lower the cost and improve the energy density of lithium-ion batteries by adopting the Co-free and Ni-rich layered ***, their practical application is severely limited by structural instability and slow kinetics. Herein,ultrahigh-nickel cobalt-free LiNi_(0.9)Mn_(0.1)O_(2) cathode is elaborate designed via in-situ trace substitution of tungsten by a wet co-precipitation method following by high-temperature sintering. It is revealed that the in-situ doping strategy of high valence W^(6+) can effectively improve the structure stability by reducing irreversible phase transition and suppressing the formation of microcracks. Moreover, the transformed fine particles determined by W-doping can facilitate the kinetic characteristics by shortening Li^(+) diffusion paths. As expected, 0.3 mol% W-doped LiNi_(0.9)Mn_(0.1)O_(2) cathode exhibits a high specific capacity of 143.5 mAh/g after 200 cycles at high rate of 5 C in the wide potential range of 2.8-4.5 V, representing a potential next-generation cathode with low-cost, high energy-density and fast-charging capabilities.
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