Nanosize LiFePO4 (LFP) Powder with High-Rate (20C) and Wide Temperature (-40 to 60℃) for Li-Ion Battery Cathode, 100 g/bottle, CLIBCNLFPHRWT

To achieve high-rate performance in LiFePO4 (LFP) over a wide temperature range (typically defined as -30°C to +60°C), synthesis must overcome the material's intrinsic 1D lithium-ion diffusion path and low electronic conductivity.

To push LFP to high rates (10C to 50C), the goal is to shorten the diffusion distance (L) for lithium ions, as the diffusion time is proportional to L^2. Typically the following strategies are explored: (1) Nano-structuring: Reducing primary particle size to <100 nm. This is often achieved via solvothermal synthesis or solution combustion, which yield smaller, more uniform particles than traditional solid-state methods. (2) 3D Conductive Networks: Moving beyond simple amorphous carbon. Using Graphene or Carbon Nanotubes (CNTs) creates a "superhighway" for electrons, ensuring the entire electrode surface is active even during rapid pulses. (3) Surface Coating (Ga, Metal Oxides): Recent research shows that coating LFP with metals like Gallium or oxides like Al2O3 can improve electronic density without sacrificing tap density, providing a more robust electron-conduction shell than carbon alone.

The "bottleneck" in cold weather is the charge transfer resistance (Rct) at the cathode/electrolyte interface. (1) Bulk Doping: Substituting Fe^{2+} with ions like Mg^{2+}, Zr^{4+}, or V^{5+} slightly expands the lattice or creates defects that lower the activation energy for lithium-ion hopping. (2) Interfacial Engineering: Using "soft" carbon sources (like phytic acid or citric acid) during synthesis creates a more permeable carbon layer that facilitates faster ion desolvation. (3) Electrolyte Synergies: While the cathode is the focus, LFP synthesized with a high surface area requires electrolytes with low-viscosity solvents (like carboxylates) and additives (like LiDFP or LiBOB) to maintain a thin, conductive SEI at sub-zero temperatures.

The high-rate LFP powders are surface coated with carbon (2.5 wt%) for improving stability and conductivity. 

Part Number	CLIBCNLFPHRWT (C-LIB-C-NLFPHRWT)
Particle Size Distribution	D10 = 0.23 um;  D50 = 0.65 um;   D90 = 3.18 um
Main Component Content	Li: 4.3 wt%,   Fe: 32.9 wt%,  P: 20.2 wt%
Carbon Content	2.5 wt%
Tap Density	0.65 g/cm3
Specific Area	17.8 m2/g
Water Level	577 ppm
First Discharging Capacity	158.3 mAh/g (2.0-3.7 V, 0.1 C)
First Columbic Efficiency	96.9%

Notes: (1) Please store the nanosize LFP powder in a dry area (glovebox is preferred); (2) The battery powder is highly recommended to be dried at 80-100°C in a vacuum oven for 6-12 h before use. 

References: 

1. X. L. Wu, et al. Carbon-Nanotube-Decorated Nano-LiFePO4 @C Cathode Material with Superior High-Rate and Low-Temperature Performances for Lithium-Ion Batteries, Adv. Energy Mater., 2013, 3, 1155-1160.
2. B. Zhu, et al. Usefulness of uselessness: Teamwork of wide temperature electrolyte enables LFP/Li cells from -40 °C to 140 °C, Electrochimica Acta, 2022, 425, 140698.