Ampcera™ Lithium Niobium Oxide, LiNbO₃ (1wt%) coated NMC 811 Cathode Powder 10g

Ampcera LiNbO₃ (1 wt%)  coated NMC 811 Cathode Powder, 10g, 11-15um D50, Cathode Material

Product Benefit: LiNbO₃ coated NMC 811 (or NCM 811) Cathode Powder provides superior high rate capability of cathode when being used with solid state electrolyte materials.  According to a 2019 paper published by the M. Stanley Whittingham lab, the coating of LiNbO₃ on NMC 811 cathode not only supplied a protective surface coating but also optimized the electrochemical behavior of NMC 811 cathode material. 

SKU#: PO0185

NMC 811 CAS#: 346417-97-8, LiNbO3 CAS#: 12031-63-9

Package Size: 10g

Supplier: Ampcera Inc.

Specifications (Custom made cathode materials with LiNbO₃ coating can be provided by Ampcera Inc. upon request. Please contact us for a quote.)

LiNbO₃ coating: 1 wt% of NMC 811

Appearance: Ash black color powder

Molecular Formula: LiNi_0.8Co_0.10Mn_0.10O₂ (Ni:Mn:Co = 8:1:1), NMC 811

Material Type: Polycrystalline

Chemical Name or Material: Lithium Nickel Manganese Cobalt Oxide

Particle size distribution:

• D10: ~ 5 µm
• D50: 11 - 15 µm
• D90: 35 µm

Tap density: ~ 2.2 g/cm³ (typical value 2.45 g/cm³)

BET Specific Surface Area: 0.15 - 0.35 m²/g

LiNbO₃ coating thickness (TEM measurement): 5~10 nm

Chemical Composition and Impurities of NMC 811 Powder (metals only)

Electrochemical Performance of NMC 811 powder

Coulombic Efficiency (0.1C) >86%

First Discharge Capacity (button half open cell, 4.2 - 3.0V)

at 0.1C, 178 mAh/g, First discharge efficiency: ~ 85%

at 0.5C, 172 mAh/g

at 1.0C, 165 mAh/g

Capacity remaining

97% after 100 cycles

96% after 200 cycles

94% after 300 cycles

According to a recent study, LiNbO₃-coated NMC 811 cathode displays the higher discharge capacity of 203 mAh g−1 at 0.1 C and a rate performance of 136.8 mAh g−1 at 5 C at 60 °C than NMC 811 and reported oxide electrodes.

Reference: LiNbO₃-coated LiNi_0.8Co_0.1Mn_0.1O₂ cathode with high discharge capacity and rate performance for all-solid-state lithium battery, Journal of Energy Chemistry, Volume 40, January 2020, Pages 39-45

Abstract: 

In order to obtain high power density, energy density and safe energy storage lithium ion batteries (LIB) to meet growing demand for electronic products, oxide cathodes have been widely explored in all-solid-state lithium batteries (ASSLB) using sulfide solid electrolyte. However, the electrochemical performances are still not satisfactory, due to the high interfacial resistance caused by severe interfacial instability between sulfide solid electrolyte and oxide cathode, especially Ni-rich oxide cathodes, in charge-discharge process. Ni-rich LiNi_0.8Co_0.1Mn_0.1O₂ (NCM811) material at present is one of the most key cathode candidates to achieve the high energy density up to 300 Wh kg−1 in liquid LIB, but rarely investigated in ASSLB using sulfide electrolyte. To design the stable interface between NCM811 and sulfide electrolyte should be extremely necessary. In this work, in view of our previous work, LiNbO₃ coating with about 1 wt% content is adopted to improve the interfacial stability and the electrochemical performances of NCM811 cathode in ASSLB using Li₁₀GeP₂S₁₂ solid electrolyte. Consequently, LiNbO₃-coated NCM811 cathode displays the higher discharge capacity and rate performance than the reported oxide electrodes in ASSLB using sulfide solid electrolyte to our knowledge.

Li-Nb-O coating/substitution enhances the electrochemical performance of LiNi_0.8Mn_0.1Co_0.1O₂ (NMC 811) Cathode, Fengxia Xin, Fengxia Xin, Hui Zhou, Xiaobo Chen, Mateusz Zuba, Natasha Chernova, Guangwen Zhou, M. Stanley Whittingham,  ACS Appl. Mater. Interfaces 2019, 11, 38, 34889-34894

Abstract:

High-nickel layered oxides, such as NMC 811, are very attractive high energy density cathode materials. However, the high nickel content creates a number of challenges, including high surface reactivity and structural instability. Through a wet chemistry method, a Li–Nb–O coated and substituted NMC 811 was obtained in a single step treatment. This Li–Nb–O treatment not only supplied a protective surface coating but also optimized the electrochemical behavior by Nb⁵⁺ incorporation into the bulk structure. As a result, the 1st capacity loss was significantly reduced (13.7 vs 25.1 mA h/g), contributing at least a 5% increase to the energy density of the full cell. In addition, both the rate (158 vs 135 mA h/g at 2C) and capacity retention (89.6 vs 81.6% after 60 cycles) performance were enhanced.

Interfacial modification for high-power solid-state lithium batteries, Solid State Ionics, Volume 179, Issues 27–32, 30 September 2008, Pages 1333-1337

Abstract: 

Interfaces between LiCoO₂ and sulfide solid electrolytes were modified in order to enhance the high-rate capability of solid-state lithium batteries. Thin films of oxide solid electrolytes, Li₄Ti₅O₁₂, LiNbO₃, and LiTaO₃, were interposed at the interfaces as buffer layers. Changes in the high-rate performance upon heat treatment revealed that the buffer layer should be formed at low temperature to avoid thermal diffusion of the elements. Buffer layers of LiNbO₃ and LiTaO₃ can be formed at low temperature for the interfacial modification, because they show high ionic conduction in their amorphous states, and so are more effective than Li₄Ti₅O₁₂ for high-power densities.