Nanocellulose: Deeply exploring the field of new energy storage and empowering the innovation of green lithium battery industry

In the context of the rapid development of the new energy storage and power battery industries, high safety, long cycle, high energy density, low carbon and environmental protection have become the core development trends of the industry. Traditional energy storage supporting materials such as polyolefin and glass fiber are limited by their physical structure and chemical properties. They generally have problems such as poor wettability, insufficient high temperature resistance, weak mechanical stability, and poor environmental protection. They are difficult to meet the iterative needs of high-end lithium batteries, large-scale energy storage, and solid-state batteries. As a new type of natural biomass nanofunctional material, nanocellulose has multiple advantages such as high strength, high porosity, super electrophilicity, temperature resistance and stability, and biodegradability due to its unique three-dimensional nanonetwork structure. It has become a core new material in the current field of new energy storage to break through material bottlenecks and achieve product quality and cost reduction.

Nanocellulose is mainly made of bamboo pulp, agricultural and forestry straw and other renewable biomass as raw materials. The whole process is green preparation, low carbon and low consumption, no harmful residues, and can achieve environmental protection and controllability throughout the life cycle. Compared with traditional petrochemical and inorganic energy storage materials, its flexible nanofiber structure effectively solves industry pain points such as easy deformation of pole pieces, easy heat shrinkage of diaphragms, and poor electrolyte retention. It also takes into account lightweight and structural stability, and is suitable for industrial applications in multiple scenarios such as power batteries, industrial and commercial energy storage, household energy storage, and supercapacitors. It is a key basic material with both technical value, economic value, and green value in the new energy energy storage track.

1. The core advantages of nanocellulose adapted to new energy storage

Energy storage devices such as energy storage batteries and supercapacitors have strict requirements on the pore structure, electrolyte wettability, mechanical properties, high temperature resistance and lightweight indicators of supporting functional materials. The material properties of nanocellulose are highly consistent with energy storage scenarios, and can comprehensively improve the comprehensive performance of energy storage equipment from the material side. The core advantages are reflected in four major dimensions:

1, ultra-high mechanical toughness, improving battery safety and cycle life . Nanocellulose has excellent tensile strength and structural toughness, which can effectively buffer the expansion and contraction deformation of the pole pieces of lithium batteries during repeated charging and discharging processes, inhibit the powdering and shedding of electrode active materials, and stabilize the overall electrode structure. Reduce problems such as battery bulges, local short circuits, and rapid capacity attenuation from the source, significantly extend the cycle life of energy storage batteries, and greatly improve the operational safety and stability of energy storage equipment.

2, high pore through structure, optimizing charge and discharge efficiency and rate performance . Nanocellulose has a unique three-dimensional network microporous structure, with uniform pore distribution and good penetration, and has strong adsorption and liquid retention capabilities for electrolytes. Compared with traditional materials, it can significantly accelerate the lithium ion conduction rate, reduce battery internal resistance, effectively improve polarization problems under fast charging conditions, improve battery rate performance, and is perfectly suitable for mainstream application scenarios such as high-power energy storage and power battery fast charging.

3, outstanding lightweight characteristics and improved battery energy density . The density of this material is much lower than that of traditional inorganic reinforced materials and glass fiber materials. While maintaining structural strength and stability, it can effectively reduce the overall weight of the battery, increase the energy density per unit volume and unit weight of energy storage equipment, and help new energy power batteries and portable energy storage equipment achieve lightweight and long-lasting upgrades.

4, temperature-resistant, stable, green and environmentally friendly, broadening the application boundaries of all working conditions . Nanocellulose has excellent high temperature resistance and anti-aging properties. It can be adapted to the high and low temperature operating environment of energy storage equipment and is not prone to performance degradation. At the same time, the material does not release harmful substances, is completely biodegradable, and has no secondary pollution. It can effectively reduce the carbon footprint of energy storage products, help companies build a green supply chain, and meet the green development requirements of the new energy industry under the dual-carbon policy.

2. The core application of nanocellulose in the energy storage industry chain

With its diversified performance advantages, nanocellulose has been deeply integrated into the entire lithium battery energy storage industry chain and is widely used in core links such as battery separator modification, electrode reinforcement substrates, supercapacitors, and solid-state battery substrates. It has become a key functional material that drives the performance upgrade of energy storage products.

1, battery separator modified coating to comprehensively improve battery safety and endurance performance

The battery separator is the core safety barrier of lithium batteries, which directly determines the thermal stability, cycle life and charge and discharge efficiency of the battery. Traditional polyolefin separators on the market commonly have problems such as poor electrolyte wettability, insufficient liquid retention capacity, easy shrinkage and deformation at high temperatures, and uneven pores. Long-term use is prone to problems such as increased internal resistance, accelerated cycle attenuation, and high-temperature failure, which restricts the development of high-end energy storage batteries.

Using nanocellulose for membrane modification and surface coating treatment, a uniform, breathable and stable nanofiber protective layer can be constructed on the surface of the membrane. On the one hand, it greatly improves the lyophilicity and liquid-locking ability of the separator, reduces electrolyte volatilization and loss, continues to ensure efficient and stable conduction of lithium ions, and effectively improves battery life stability and cycle times; on the other hand, it significantly strengthens the high-temperature resistance and shrinkage resistance of the separator, avoiding potential safety hazards such as separator damage and positive and negative electrode contact short circuits under high-temperature conditions, and improving the overall thermal safety factor of the battery. At present, nanocellulose-modified separators have been maturely used in mainstream scenarios such as power lithium batteries, large-scale industrial and commercial energy storage, and household energy storage. They are the mainstream technical solution for upgrading separator materials.

2, electrode reinforced substrate and environmentally friendly binder to solve the problem of capacity fading

The positive and negative active materials of lithium batteries will continue to expand and contract in volume during long-term charge and discharge cycles, and are prone to problems such as electrode cracking, active material shedding, and pulverization, resulting in rapid battery capacity attenuation and significantly shortened service life, which is the core technical pain point of high-capacity energy storage batteries.

Nanocellulose can replace some traditional chemical binders and be used as a high-performance and environmentally friendly electrode reinforcement substrate. Its three-dimensional network structure can tightly wrap the electrode active particles, build a stable and continuous conductive network, effectively buffer the electrode deformation pressure, and prevent the active material from falling off and failing. At the same time, it can reduce the internal resistance of electrode contact and improve charge transfer efficiency, allowing the battery capacity to be fully released and charging and discharging efficiency to be higher. Electrode materials modified with nanocellulose can significantly improve the long-term cycle stability and high-rate charge and discharge performance of batteries, and are especially suitable for large-scale energy storage battery systems with long life and high capacity.

3, supercapacitors and solid-state battery substrates, laying out the next generation of energy storage technology

In the field of supercapacitors, high-performance flexible composite electrode materials can be prepared based on the characteristics of nanocellulose with high specific surface area, high porosity, and high flexibility. This material can load more conductive active substances, effectively improve the specific capacity and power density of supercapacitors, and has excellent fatigue resistance and bending stability. It can be widely used in emerging scenarios such as vehicle-mounted energy storage, flexible energy storage, and small portable energy storage.

In the next generation of solid-state batteries, nanocellulose is an excellent carrier material for solid electrolytes. Its stable nano-network structure can uniformly fix solid electrolyte powder, build a continuous and smooth ion transmission channel, effectively solve the industry problems of poor solid-state battery interface contact and high impedance, greatly improve the ion conduction efficiency and structural stability of solid-state batteries, and provide core material support for the large-scale industrialization of solid-state batteries.

3. The core value of nanocellulose empowering the energy storage industry

Compared with traditional energy storage modified materials, the industrialization of nanocellulose has achieved triple value breakthroughs in performance upgrade, cost optimization, and green and low-carbon for the new energy storage industry. At the performance level, it solves the three core pain points of lithium battery safety, endurance and lifespan from the material side, and comprehensively improves the comprehensive performance of energy storage equipment; at the cost level, relying on the low-cost advantages of agricultural and forestry renewable raw materials, coupled with mature and refined preparation processes, it effectively reduces the comprehensive application of energy storage materials. It also reduces battery consumption and replacement frequency, reducing end-user operation and maintenance costs. In terms of environmental protection, the entire process is green and fully degradable, helping energy storage companies reduce product carbon footprints, meet green supply chain certification and dual-carbon compliance requirements, and enhance product market competitiveness.

4. Industry development prospects and corporate technology layout

As the global new energy storage and power battery industries continue to upgrade, high safety, long cycle, high energy density, low carbon and environmental protection have become hard industry standards. The performance bottlenecks of traditional chemical and inorganic materials have become increasingly obvious, and the market substitution space and industrialization value of nanocellulose continue to be released. At present, nanocellulose has been widely used in various scenarios such as passenger car power batteries, photovoltaic and wind power large-scale energy storage, household energy storage, portable energy storage, etc., and the industry penetration rate continues to increase.

In the future, the company will continue to develop core technologies for refined preparation and composite modification of nanocellulose , focus on the core pain points of the new energy storage industry, continue to optimize core indicators such as material pore structure, electrolyte wettability, mechanical strength, and temperature resistance stability, and develop special nanocellulose products suitable for energy storage equipment in all scenarios. With new natural green biomass materials as the core, we will promote the high-quality and low-carbon development of the new energy storage industry and enable the implementation of the global dual-carbon goal.