首页|Supplying active lithium to single-crystal Li(Ni0.90Co0.05Mn0.05)0.98Ta0.02O2 with Li2MnO3 coating served as cathode for Li-ion batteries

Supplying active lithium to single-crystal Li(Ni0.90Co0.05Mn0.05)0.98Ta0.02O2 with Li2MnO3 coating served as cathode for Li-ion batteries

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Ni-rich layered oxide with Ni molar content larger than 90％was regarded as an extremely promising candidate for cathode material applied in lithium-ion batteries owing to the significant discharging capacity and low cost.Nevertheless,rigorous cycling attenuation resulted from the crystal structure collapse and unstable particles interface deeply restrained the commercial application.In the work,LiNi0.90Co0.05Mn0.05O2 was modified by Ta5+doping and Li2MnO3 covering,which was aimed to enhance the structure stability,defend the electrolyte attacking and promote Li+migration during cycling.The material characterization demonstrated the cathodes after Ta5+doping delivered the larger cell lattice parameters and higher cation ordering,which was helpful to improve the rate property and discharge capacity at low temperature.The Li2MnO3 layer was tightly adhered on the outside of LiNi0.90-Co0.05Mn0.05O2,which could effectively relieve the electrolyte attacking and sustain the particle morphology integrity.As a result,2 wt％Li2MnO3 coated Li(Ni0.90Co0.05Mn0.05)0.98Ta0.02O2 exhibited the outstanding discharge capacity of 150.2 mAh g-1 at 10.0 large current density and 140.6 mAh g-1 at-30℃ as well as the remarkable capacity retention of 93.1％after 300 cycles.Meanwhile,the pouch full batteries obtained by 2 wt％Li2MnO3 coated Li(Ni0.90Co0.05Mn0.05)0.98Ta0.02O2 also showed the more stable storage capability,cyclic property in comparison with bare LiNi0.90Co0.05Mn0.05O2.

LiNi0.90Co0.05Mn0.05O2Li supplementLi2MnO3 coatingHigh chemical valence state Ta5+dopingEnhanced safety and electrochemical property

Li Dong、Xiaodong Guan、Yang Zhou、Shibao Tang、Feng Chen

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School of Materials Science and Engineering,Suzhou University of Science and Technology,Suzhou,215009,China

Suzhou Huayi New Energy Technology Co.,Ltd.,Suzhou,215433,China

Xingna Energy(Suzhou)Co.,Ltd.,Suzhou,215000,China

Chenguang High Performance Fluorine Material Innovation Center in Sichuan University of Science and Engineering,Zigong,643000,China

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2024

10.1016/j.partic.2024.09.019

颗粒学报(英文版)
中国颗粒学会　中国科学院过程工程研究所

颗粒学报(英文版)

CSTPCD
影响因子：0.632
ISSN：1674-2001
年,卷(期)：2024.95(12)