Solution Chapter — Focusing on anode interface modification to overcome bottlenecks in LFP fast-charging technology.

In our previous feature article, we thoroughly examined the key competitive advantages and application bottlenecks of lithium iron phosphate (LFP) batteries. Thanks to their low cost, high safety, and long cycle life, LFP batteries have become the mainstream choice in both power‑train and energy‑storage applications. However, they also face three inherent limitations—difficulties in fast charging, significant capacity fade at elevated temperatures, and challenges in achieving uniform electrolyte infiltration into highly compact electrode sheets—which hinder further advancements in high‑power, high‑temperature, and high‑energy‑density applications. Currently, the industry is exploring optimization strategies across three major components: the cathode, the anode, and the electrolyte. Cathode optimization primarily relies on techniques such as coating, elemental doping, and nanostructuring to enhance electrical conductivity and shorten ion‑diffusion pathways. ^[1,2] ; Anode optimization focuses on surface modification and reducing metal-ion deposition to enhance the structural stability of the anode. ^[3] Electrolyte is the core medium for lithium-ion transport and directly determines the overall performance of the battery. It consists primarily of three major components: lithium salts, solvents, and additives. Although additives are used in small quantities, they can deliver a disproportionately large impact on material properties, making them crucial for enhancing the performance of LFP batteries.

I. Overcoming the Challenges of Fast Charging for LFP: An Additive-Based Solution for High Impedance

The fast-charging performance of LFP batteries is limited, primarily due to their intrinsic low electronic conductivity and ion diffusion coefficient. ^[3] Furthermore, during the first charge–discharge cycle, the graphite anode readily undergoes reductive decomposition of the electrolyte’s main solvent, leading to the formation of an uneven and unstable solid–electrolyte interphase (SEI) film. This results in excessively high impedance, hinders lithium-ion transport, limits charging rates, and ultimately degrades cycle life.

Material‑side nanostructuring, in situ carbon coating, ion doping, or crystallographic facet engineering, as well as the Li‑based electrolyte solvent system. ⁺ Solvent‑mediated strategies can all enhance the rate performance of LFP, but they are relatively costly. Moreover, for LFP batteries, the primary technical challenges in fast charging still lie on the graphite anode side. ^[4] Graphite anodes are prone to polarization; at high charging rates, this leads to increased graphite anodization, causing the graphite anode potential to drop prematurely to 0 V and resulting in non-uniform lithium metal deposition. ^{[ 5,6 ]} By constructing a stable solid electrolyte interphase (SEI) film with high ionic conductivity, an important technological pathway is established to enhance the fast‑charging performance of graphite anodes. ^[7,8] 。

In constructing conditions favorable to Li ⁺ Regarding the solid electrolyte interphase (SEI), it is widely accepted that the inorganic components of the SEI are crucial for enhancing thermodynamic stability, mechanical strength, structural density, and ionic conductivity, while the organic components impart a certain degree of flexibility to the SEI film. Most of the inorganic constituents in the SEI—such as LiF, Li… ₃ N, Li ₂ O and Li ₂ CO ₃ The ionic migration energy barrier of ) is lower than that of alkyl lithium carbonates, which means they offer a greater advantage in facilitating lithium-ion transport. ^[9] Common anode‑forming additives include unsaturated compounds, fluorine‑based, sulfur‑based, boron‑based, phosphorus‑based, and silicon‑based species. Fluorine‑containing additives preferentially undergo reductive decomposition at the anode, yielding an SEI layer rich in LiF, which reduces interfacial polarization and accelerates lithium‑ion desorption and migration; a typical example is fluoroethylene carbonate (FEC). Sulfur‑containing additives are often employed to lower the impedance of the graphite‑electrolyte interface; in particular, ethylene sulfite (DTD), a widely used additive, can form a uniform, stable SEI layer during the battery formation process that is enriched in low‑impedance lithium sulfates. ^{[10, 11]} In addition, organic additives containing phosphorus, boron, and other elements—such as lithium difluorooxalate borate (LiDFOB) and lithium difluorophosphate (LiDFP)—have also been shown to effectively enhance the fast‑charging performance of graphite electrodes. ^[9] 。

II. Cheerchem Advanced Material’ Solutions

As a high-tech enterprise deeply rooted in the lithium‑ion battery electrolyte additive sector, Cheerchem Advanced Material precisely targets the core needs of LFP battery performance enhancement and has steadily established a diversified production capacity for multiple categories of electrolyte additives. Addressing the industry’s key priorities of impedance reduction and accelerated charging, the company has developed a comprehensive portfolio of additives—including fluorine‑based, sulfur‑based, silicon‑based, phosphorus‑based, and lithium‑salt formulations—providing end‑to‑end, specialized solutions to optimize the electrochemical performance of LFP batteries.

Several common additives used to enhance the rate performance of LFP: their structures and the mechanisms by which they improve rate capability and fast‑charging.

III. Advantages of Cheerchem Advanced Material

(1) Production Scale

The company leverages its three major production bases in Changshu, Jiangsu; Jiaxiang, Shandong; and Lianjiang, Fujian, with a total electrolyte additive capacity of 36,900 tons. Among these, core products such as VC (9,000 tons/year), FEC (6,000 tons/year), and DTD (5,000 tons/year) rank among the industry’s highest in production capacity, ensuring reliable fulfillment of bulk delivery requirements for key customers.

(2) Market share

Leveraging its deep technological expertise and first-mover advantage, Cheerchem Advanced Material ranks first nationwide or at the top of the industry in market share for multiple mainstream additive products, including DTD, TMSP, and TMSB, and serves as a core supplier to leading downstream electrolyte manufacturers.

(3) Quality

The company has established a rigorous, end-to-end quality control system and holds prestigious certifications, including ISO 9001, ISO 14001, ISO 45001, IATF 16949, and Level II safety production standards. It strictly monitors critical electrolyte parameters such as purity, moisture content, and metal ion levels, effectively ensuring the long-term stability of both the electrolyte and the battery system, thereby earning widespread customer recognition.

(4) Innovation

Cheerchem Advanced Material consistently adheres to a research‑driven growth strategy, continuously increasing its R&D investment, establishing specialized R&D platforms and technical teams, and deeply cultivating cutting‑edge advancements in electrolyte additive technologies. At the same time, guided by a customer‑centric service philosophy, the company maintains close collaboration and joint R&D efforts with leading electrolyte and battery manufacturers across the value chain, precisely addressing the customized development needs of diverse battery chemistries and application scenarios.

Cheerchem Advanced Material consistently aligns with the evolving trends of the lithium‑ion battery industry, focusing on addressing key challenges in LFP batteries—such as fast charging, long cycle life, high‑temperature stability, and iron leaching inhibition. By continuously ramping up R&D investment, the company has successively developed a series of customized, next‑generation electrolyte additives, delivering highly effective solutions that drive performance breakthroughs in LFP systems and helping customers maintain a leading edge in an increasingly competitive market.

IV. References

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[2] James D. Wilcox, Marca M. Doeff, Marek Marcinek, et al. Factors influencing the quality of carbon coatings on LiFePO ₄ [J]. J. Electrochem. Soc., 154, A389-A395.

[3] Cao Zheng. High-Temperature Capacity Fade Mechanism and Its Improvement in Lithium Iron Phosphate Batteries [D]. Central South University, 2013.

[4] Richard Schmuch, Ralf Wagner, Gerhard Hörpel, et al. Performance and cost of materials for lithium-based rechargeable automotive batteries[J]. Nat. Energy., 2018, 3, 267-27.

[5] E.R. Logan, J.R. Dahn. Electrolyte design for fast-charging Li-ion batteries[J]. Trends Chem., 2020, 2, 354-366.

[6] Andrew M. Colclasure, Alison R. Dunlop, Stephen E. Trask, et al. Requirements for enabling extreme fast charging of high energy density Li-ion cells while avoiding lithium plating[J]. J. Electrochem. Soc., 2019, 166, A1412.

[7] Jianhui He, Jingke Meng, Yunhui Huang, et al. Challenges and recent progress in fast-charging lithium ion battery materials [J]. J. Power Sources, 2023, 570, 232965.

[8] Lei Sheng, Zeng Ziqi, Cheng Shijie, et al. Fast‐charging of lithium‐ion batteries: A review of electrolyte design aspects[J]. Battery Energy, 2023, 2, 20230018.

[9] Mao Chong, Yang Haizhao, Wang Pippie, et al. Recent advances in fast‑charging electrolytes for lithium‑ion batteries [J]. Review of Power Sources, 2025, 49(6), 1084–1099.

[10] Bing Han, Yucheng Zou, Guiyin Xu, et al. Additive stabilization of SEI

on graphite observed using cryo-electron microscopy[J]. Energy Environ. Sci., 2021, 14, 4882-4889.

[11] CHaoran Cheng, Zheng Ma, Pushpendra Kumar, et al. Non-flammable electrolyte mediated by solvation chemistry toward high voltage lithium-ion batteries[J]. ACS Energy Lett, 2024, 9, 1604-1616.