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Title: Toward a high-voltage fast-charging pouch cell with TiO2 cathode coating and enhanced battery safety

Journal Article · · Nano Energy
 [1];  [2];  [1];  [1];  [3];  [1];  [1];  [1];  [1];  [4];  [4];  [1];  [1];  [5];  [1]
  1. Tsinghua Univ., Beijing (China)
  2. Tsinghua Univ., Beijing (China); Argonne National Lab. (ANL), Lemont, IL (United States)
  3. Argonne National Lab. (ANL), Lemont, IL (United States)
  4. Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
  5. Argonne National Lab. (ANL), Lemont, IL (United States); Stanford Univ., CA (United States)
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Nickel-rich layered lithium transition metal oxides, LiNixCoyMn1-x-yO2, are key cathode materials for high-energy lithium-ion batteries owing to their high specific capacity. However, the commercial deployment of nickel-rich oxides has been hampered by their poor thermostability and insufficient cycle life. In this work full batteries with uncoated and TiO2-coated LiNi0.5Co0.2Mn0.3O2 cathodes and graphite anodes are compared in terms of electrochemical performance and safety behavior. The battery using a TiO2-coated LiNi0.5Co0.2Mn0.3O2 cathode exhibited better cyclic performance at high cutoff voltage. Electrochemical impedance spectroscopy analysis indicated that the TiO2-coated LiNi0.5Co0.2Mn0.3O2 cathode gave the battery a more stable charge transfer resistance. Transmission electron microscopy demonstrated that TiO2 coating reduced accumulation of the cathode electrolyte interface layer on the particle surface. Time-of-flight secondary ion mass spectrometry demonstrated that TiO2 coating markedly enhanced the interface stability of the cathode particle and protected the particle from serious etching by the electrolyte. Accelerating rate calorimetry revealed that the trigger temperature of thermal runaway for the battery using TiO2-coated LiNi0.5Co0.2Mn0.3O2 as cathode material was 257 °C, which was higher than that of the battery with the uncoated LiNi0.5Co0.2Mn0.3O2 cathode (251 °C). In situ X-ray diffraction during heating demonstrated that this enhanced safety can be attributed to the suppressed phase evolution of the coated cathode material.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); Ministry of Science and Technology of the People’s Republic of China (MOST); USDOE Office of Energy Efficiency and Renewable Energy (EERE), Transportation Office. Vehicle Technologies Office
Grant/Contract Number:
AC02-06CH11357; 2016YFE0102200
OSTI ID:
1630084
Alternate ID(s):
OSTI ID: 1602336
Journal Information:
Nano Energy, Vol. 71; ISSN 2211-2855
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 60 works
Citation information provided by
Web of Science

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Related Subjects

25 ENERGY STORAGE
Cathode
High voltage
Lithium-ion batteries
Safety
TiO2-Coated LiNi0.5Co0.2Mn0.3O2