{"id":4672,"date":"2026-07-01T14:51:57","date_gmt":"2026-07-01T06:51:57","guid":{"rendered":"https:\/\/www.superfinemill.com\/?p=4672"},"modified":"2026-07-01T14:52:00","modified_gmt":"2026-07-01T06:52:00","slug":"how-lithium-ion-battery-material-work-microstructure-and-ultrafine-grinding-integration","status":"publish","type":"post","link":"https:\/\/www.superfinemill.com\/ja\/how-lithium-ion-battery-material-work-microstructure-and-ultrafine-grinding-integration\/","title":{"rendered":"\u30ea\u30c1\u30a6\u30e0\u30a4\u30aa\u30f3\u96fb\u6c60\u6750\u6599\u306e\u4ed5\u7d44\u307f\uff1a\u5fae\u7d30\u69cb\u9020\u3068\u8d85\u5fae\u7c89\u7815\u306e\u7d71\u5408"},"content":{"rendered":"

The lithium-ion battery material system is highly complex. From electrochemical core materials to structural components, it can be divided into five major categories. In industrial production practice, \u8d85\u5fae\u7c89\u7815<\/a> (deagglomeration, dispersion, micronization, and nano-sizing) is a key engineering technology that determines whether these materials can be successfully applied.<\/p>\n\n\n\n

I. Lithium-Ion Battery Cathode Material<\/h2>\n\n\n\n
\"Cathode<\/figure>\n\n\n\n

Cathode materials are the source of lithium ions in the battery, and their performance directly determines energy density, cost, and safety. After high-temperature solid-state calcination, cathode materials typically exist as hard agglomerates or dense blocks, which must be processed using ultrafine grinding equipment.<\/p>\n\n\n\n

1.1 Layered Oxides (High energy density, relatively lower stability)<\/h3>\n\n\n\n

Layered oxide materials face a key challenge during ultrafine grinding: avoiding structural damage and excessive surface residual lithium formation.<\/p>\n\n\n\n

Lithium Cobalt Oxide (LCO, LiCoO\u2082)<\/h4>\n\n\n\n

A dominant material in consumer electronics with high voltage platform and high tap density. Industrial production typically uses fluidized-bed jet mills or precision mechanical impact mills for ultrafine grinding. The goal is to achieve narrow particle size distribution while maximizing tap density.<\/p>\n\n\n\n

Nickel Cobalt Manganese Oxide (NCM) \/ Nickel Cobalt Aluminum Oxide (NCA)<\/h4>\n\n\n\n

Mainstream materials for power batteries.<\/p>\n\n\n\n

Polycrystalline ternary materials:<\/strong>
These consist of micron-scale secondary spheres formed by nano-primary particles. During grinding, jet milling under high-purity dry nitrogen protection is required. The mechanism relies on inter-particle self-collision to achieve \u201cdeagglomeration\u201d without breaking secondary spheres, preventing exposure of fresh surfaces that would increase surface residual lithium (Li\u2082CO\u2083 \/ LiOH).<\/p>\n\n\n\n

Single-crystal ternary materials:<\/strong>
After calcination, they form extremely hard agglomerates. These must be processed using high-energy mechanical impact mills or wet stirred media mills (sand mills) to obtain independent single-crystal particles of 2\u20135 \u03bcm.<\/p>\n\n\n\n

Lithium-Rich Manganese-Based Materials<\/h4>\n\n\n\n

Next-generation high-energy-density candidates. Due to poor rate performance, wet ultrafine sand mills are often used to reduce particle size to submicron levels (nano-sizing), shortening lithium-ion diffusion paths.<\/p>\n\n\n\n

1.2 Olivine Structure (High stability, safety, long life)<\/h3>\n\n\n\n

Lithium Iron Phosphate (LFP) & Lithium Manganese Iron Phosphate (LMFP)<\/h4>\n\n\n\n
\"Ternary<\/figure>\n\n\n\n

LFP suffers from extremely low electronic conductivity and lithium-ion diffusion coefficient. To activate its performance, an industrial strategy of \u201cnano-sizing + carbon coating\u201d is required.<\/p>\n\n\n\n

Ultrafine grinding involvement:<\/strong>
In precursor batching stages, high-efficiency wet sand mills (zirconia beads of 0.1\u20130.3 mm) are used to ultrafinely grind iron source, phosphorus source, lithium source, and carbon source into nanoscale slurry (D50 < 100 nm). This ensures atomic-level contact during calcination.<\/p>\n\n\n\n

After calcination, the final product is further deagglomerated by \u30b8\u30a7\u30c3\u30c8\u30df\u30ea\u30f3\u30b0<\/a> to meet electrode coating requirements.<\/p>\n\n\n\n

1.3 Spinel Structure (Low cost, good safety)<\/h3>\n\n\n\n

\u30de\u30f3\u30ac\u30f3\u9178\u30ea\u30c1\u30a6\u30e0\uff08LMO\uff09<\/h4>\n\n\n\n

LMO has moderate high-temperature stability and energy density. Ultrafine grinding typically uses jet mills or air-classification impact mills<\/a>, controlling D50 around 10 \u03bcm. The key is to strictly avoid excessive fines, as too many ultrafine particles accelerate manganese dissolution into the electrolyte at high temperatures.<\/p>\n\n\n\n

II. Lithium-Ion Battery Anode Material<\/h2>\n\n\n\n

The anode serves as the lithium-ion storage host and directly affects fast-charging capability, cycle life, and safety against lithium dendrite formation. Ultrafine grinding plays a critical role in particle shaping and nano-engineering.<\/p>\n\n\n\n

2.1 Carbon-Based Materials (Dominant mainstream)<\/h3>\n\n\n\n

Graphite (Natural \/ Artificial)<\/h4>\n\n\n\n

Ultrafine grinding and mechanical spheroidization:<\/strong>
Natural graphite has a flake-like structure, which leads to anisotropic electrode behavior. Industrial processing requires vertical impact mills (pin mills\/turbo mills) for ultrafine grinding, followed by spheroidizing equipment to convert flakes into spherical particles.<\/p>\n\n\n\n

Classification deagglomeration:<\/strong>
Artificial graphite after ~3000\u00b0C graphitization tends to agglomerate. Jet milling and classification systems are used for gentle deagglomeration and precise particle size control.<\/p>\n\n\n\n

Disordered Carbon (Hard\/Soft Carbon)<\/h4>\n\n\n\n

Promising anode for sodium-ion batteries and fast charging. Precursors such as biomass or pitch require long-duration high-energy \u30dc\u30fc\u30eb\u30df\u30eb<\/a> or impact milling to achieve ultrafine powders with tailored pore structures.<\/p>\n\n\n\n

Carbon Nanotubes (CNT) \/ Graphene<\/h4>\n\n\n\n

Used as conductive additives. They are highly prone to agglomeration and require high-shear wet dispersion systems or ultrasonic microfluidic milling to fully disperse into uniform conductive networks.<\/p>\n\n\n\n

2.2 Silicon-Based Materials (Next-generation anode, ultra-high capacity)<\/h3>\n\n\n\n

Silicon-Carbon (Si-C) \/ Silicon-Oxide (Si-O)<\/h4>\n\n\n\n

Silicon undergoes >300% volume expansion during cycling.<\/p>\n\n\n\n

Ultrafine grinding involvement:<\/strong>
To mitigate stress, silicon must be reduced to nanoscale (<100 nm, sometimes <50 nm). Industrial processes typically useall-ceramic-lined ultra-fine wet sand mills , grinding micron-sized silicon into nano-silicon slurry under water or organic solvent systems. The resulting nano-silicon is then composited with carbon matrices.<\/p>\n\n\n\n

2.3 Lithium Titanate (LTO)<\/h3>\n\n\n\n

A \u201czero-strain\u201d material with excellent safety and cycle life but poor conductivity. Production uses a combination of wet grinding + spray drying + jet deagglomeration to achieve submicron particles.<\/p>\n\n\n\n

2.4 Metallic Lithium<\/h3>\n\n\n\n

Prepared via molten processing or physical vapor deposition, and does not involve traditional ultrafine powder grinding.<\/p>\n\n\n\n

III. Electrolyte<\/h2>\n\n\n\n
\"solid
solid electrolytes<\/figcaption><\/figure>\n\n\n\n

The electrolyte acts as the \u201chighway\u201d for lithium-ion transport and determines ionic conductivity and operating temperature range.<\/p>\n\n\n\n

3.1 Liquid Electrolyte<\/h3>\n\n\n\n

Composed of lithium salts (e.g., LiPF\u2086, LiFSI), organic solvents, and additives. Although liquid systems do not require grinding, solid lithium salt precursors still require anti-moisture, explosion-proof ultrafine deagglomeration equipment<\/strong> during production.<\/p>\n\n\n\n

3.2 Solid-State Electrolyte (Core of all-solid-state batteries)<\/h3>\n\n\n\n

Includes polymer, oxide (e.g., LLZO), and sulfide (e.g., LPS) systems.<\/p>\n\n\n\n

Ultrafine grinding involvement:<\/strong>
The key challenge is high solid-solid interfacial resistance. Therefore, solid electrolytes must be nano-sized to maximize interfacial contact.<\/p>\n\n\n\n

Sulfide electrolytes:<\/h4>\n\n\n\n

Highly sensitive to moisture and can generate toxic H\u2082S gas. They must be processed in glove boxes (argon atmosphere) using sealed high-energy planetary ball mills or wet sand mills with non-polar solvents, reducing particle size to several hundred nanometers to significantly improve room-temperature ionic conductivity.<\/p>\n\n\n\n

IV. Separator<\/h2>\n\n\n\n

The separator is a porous insulating film that prevents direct contact between electrodes while allowing lithium-ion transport.<\/p>\n\n\n\n

4.1 Base Film and Ceramic Coating<\/h3>\n\n\n\n

Mainstream materials are polyolefin microporous membranes (PE\/PP). To improve thermal stability, ceramic coatings are applied.<\/p>\n\n\n\n

Ultrafine grinding involvement:<\/strong>
Al\u2082O\u2083 or boehmite powders used for coating must have extremely fine and narrow particle size distribution to avoid membrane damage. Industrial production uses high-purity ceramic-lined sand mills, producing slurry with D50 \u2248 0.3\u20130.5 \u03bcm.<\/p>\n\n\n\n

\"application
\u30ea\u30c1\u30a6\u30e0\u30a4\u30aa\u30f3\u96fb\u6c60\u6750\u6599\u3078\u306e\u8d85\u5fae\u7c89\u7815\u6a5f\u306e\u5fdc\u7528<\/figcaption><\/figure>\n\n\n\n

V. Auxiliary and Structural Components<\/h2>\n\n\n\n

Although not directly involved in electrochemical reactions, they are crucial for electrode processing and battery performance.<\/p>\n\n\n\n

5.1 Conductive Agents (Carbon black, graphite, CNT)<\/h3>\n\n\n\n

Finer and better-dispersed conductive particles form superior electronic networks.<\/p>\n\n\n\n

During slurry preparation, high-shear dispersion machines, dual planetary mixers, or twin-screw continuous slurry dispersion systems are used to break agglomerates and uniformly distribute conductive additives.<\/p>\n\n\n\n

5.2 Binders (PVDF, SBR, CMC)<\/h3>\n\n\n\n

Do not involve grinding, but some solid raw materials require mechanical pre-crushing to accelerate dissolution.<\/p>\n\n\n\n

5.3 Current Collectors & Structural Components<\/h3>\n\n\n\n

Metal processing domain; no ultrafine grinding involved.<\/p>\n\n\n\n

Conclusion: Ultrafine Grinding as the \u201cInvisible Core Technology\u201d of Lithium Batteries<\/h2>\n\n\n\n

From the entire system, one key conclusion can be drawn:<\/p>\n\n\n\n

\ud83d\udc49 Lithium-ion batteries are not purely \u201cmaterials science\u201d, but a deeply integrated system of powder engineering + ultrafine grinding technology + interface engineering.<\/p>\n\n\n\n

Ultrafine grinding determines three core performance dimensions:<\/p>\n\n\n\n