Enabling Superior Cycling Stability of LiNi_(0.9)Co_(0.05)Mn_(0.05)O_2 with Controllable Internal Strain

Zhouliang Tan; Xiaoxuan Chen; Yunjiao LiXiaoming XiShuaipeng HaoXiaohui LiXingjie ShenZhenjiang HeWengao ZhaoYong Yang

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Enabling Superior Cycling Stability of LiNi_(0.9)Co_(0.05)Mn_(0.05)O_2 with Controllable Internal Strain

机译：Enabling Superior Cycling Stability of LiNi_(0.9)Co_(0.05)Mn_(0.05)O_2 with Controllable Internal Strain

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Intergranular cracking of Ni-rich layered LiNi_(1-x-y)Co_xMnyO_2 (1-x-y ≥ 0.8)cathode particles deteriorate the chemo–electro–mechanical stability of highenergylithium-ion batteries (LIBs), thus presenting a challenge to typicalmodification methods to establish robust structures with highly efficientlithium-ion storage. Herein, the ZrTiO_4 (ZTO) as an epitaxial layer to enhancemechanical stability of ultrahigh-Ni LiNi_(0.9)Co_(0.05)Mn_(0.05)O_2 (NCM90) isreported for the first time. Intensive exploration from structure characterizations(X-ray absorption spectroscopy and in situ X-ray diffraction techniques),multi-physics field analysis, and first-principles calculations disclose thatthe conformal ZTO layers and Zr doping effectively suppresses the internalstrain and the release of lattice oxygen, which prodigiously restrains the localstress accumulation during whole (de)lithiation processes, thereby maintaininggood mechanical stability of the materials. Meanwhile, the protectiveZTO layer also prevents electrolyte erosion, thus keeping an intact surfacestructure of NCM90. Notably, ZTO-modified NCM90 achieves significantlyimproved cyclability under high-voltage (4.5 V) operation, expressing a 17%increase in capacity retention (71% vs 88%) after 100 cycles. Overall, thiswork reveals the role of internal strain in the original degradation behaviorand effectiveness of surface engineering strategy to solve the challenge,emphasizing that the conformal surface protection mitigates the internalstress of Ni-rich NCM by anchoring the lattice oxygen.

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来源
《Advanced functional materials》 |2023年第26期|2215123.1-2215123.13|共13页
作者
Zhouliang Tan; Xiaoxuan Chen; Yunjiao LiXiaoming XiShuaipeng HaoXiaohui LiXingjie ShenZhenjiang HeWengao ZhaoYong Yang;
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School of Metallurgy and EnvironmentCentral South UniversityChangsha 410083, P. R. China,Engineering Research Center of the Ministry of Education for AdvancedBattery MaterialsCentral South UniversityChangsha 410083, P. R. China;

State Key Lab for Phys Chemistry of SolidSurfaces & Department of ChemistryXiamen UniversityXiamen 361005, P. R. China;

Changsha Research Institute of Mining and MetallurgyChangsha 410083, P. R. ChinaInstitute of NanotechnologyKarlsruhe Institute of Technology (KIT)76344 Eggenstein-Leopoldshafen, Germany;

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chemo–electro–mechanical stability; intergranular cracking; internal strains; lattice oxygen; surface modifications;

Enabling Superior Cycling Stability of LiNi_(0.9)Co_(0.05)Mn_(0.05)O_2 with Controllable Internal Strain

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